alpha Value Line / alpha Basic Line
NP(K), NPL(K), NPR(K), NPS(K), NPT(K), NTP /CP(K), CPS(K)

Technical documents

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WITTENSTEIN alpha GmbH
Walter-Wittenstein-Straße 1D-97999 Igersheim
Germany

Motor-mounting video

Customer Service department

Deutschland

WITTENSTEIN alpha GmbHservice@wittenstein.de+49 7931 493-12900

Benelux

WITTENSTEIN BVBA

service@wittenstein.biz+32 9 326 73 80

BrasilWITTENSTEIN do Brasil

vendas@wittenstein.com.br+55 15 3411 6454

service@wittenstein.cn+86 571 8869 5856

Österreich

WITTENSTEIN GmbHoﬃce@wittenstein.at+43 2256 65632-0

Danmark

WITTENSTEIN AB

info@wittenstein.dk+45 4027 4151

FranceWITTENSTEIN sarlinfo@wittenstein.fr+33 134 17 90 95

Great Britain

WITTENSTEIN Ltd.

sales.uk@wittenstein.co.uk+44 1782 286 427

ItaliaWITTENSTEIN S.P.A.

info@wittenstein.it+39 02 241357-1

sales@wittenstein.jp+81-3-6680-2835

North America

WITTENSTEIN holding Corp.

technicalsupport@wittenstein-us.com+1 630-540-5300

EspañaWITTENSTEIN S.L.U.

info@wittenstein.es+34 93 479 1305

Sverige

WITTENSTEIN AB

info@wittenstein.se+46 40-26 50 10

Schweiz

WITTENSTEIN AG Schweiz

sales@wittenstein.ch+41 81 300 10 30

info@wittenstein.tw+886 3 287 0191

info@wittenstein.com.tr+90 216 709 21 23

Türkiye

WITTENSTEIN Güç Aktarma
Sistemleri Tic. Ltd. Şti.

© WITTENSTEIN alpha GmbH 2022
Subject to technical and content changes without notice.

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Table of Contents
1

About this manual ................................................................................................3
1.1 Information symbols and cross references ..........................................................3
1.2 Scope of delivery .................................................................................................32

Safety.....................................................................................................................4
2.1 Product conformity ...............................................................................................4
2.1.1 European Union (EU) ......................................................................................4
2.1.2 United Kingdom (GB) ......................................................................................4
2.2 Personnel .............................................................................................................5
2.3 Intended use ........................................................................................................5
2.4 Reasonably foreseeable misuse ..........................................................................5
2.5 General safety instructions ..................................................................................6
2.6 Structure of warning instructions..........................................................................62.6.1 Safety symbols ................................................................................................7
2.6.2 Signal words....................................................................................................7

3

Description of the gearbox..................................................................................8
3.1 Overview of gearbox components .......................................................................8
3.1.1 Version with through-holes..............................................................................93.1.2 Version with slotted holes................................................................................93.1.3 Version with threaded bores..........................................................................10
3.2 Name plate.........................................................................................................10
3.3 Ordering code ....................................................................................................10
3.4 Dimensions and performance data ....................................................................11
3.5 Information about the lubricant ..........................................................................11
3.6 Notes regarding the IP protection class .............................................................11

4

Transport and storage .......................................................................................12
4.1 Packaging ..........................................................................................................12
4.2 Transport............................................................................................................12
4.3 Storage ..............................................................................................................12

5

Assembly ............................................................................................................13
5.1 Preparations.......................................................................................................13
5.2 Mounting the motor to the gearbox ....................................................................14
5.3 Mounting the gearbox on a machine..................................................................175.3.1 Mounting with through-holes .........................................................................175.3.2 Mounting with slotted holes ..........................................................................18
5.3.3 Mounting with threaded bores .......................................................................19
5.4 Components mounted to the output side ...........................................................195.4.1 Mounting with shrink disk ..............................................................................20

6

Startup and operation ........................................................................................21

7

Maintenance and disposal.................................................................................22
7.1 Maintenance schedule .......................................................................................22
7.2 Maintenance work ..............................................................................................22
7.2.1 Visual inspection ...........................................................................................22
7.2.2 Checking the tightening torques....................................................................22
7.3 Startup after maintenance work .........................................................................23
7.4 Disposal .............................................................................................................23

8

Malfunctions .......................................................................................................24

9

Appendix .............................................................................................................25
9.1 Specifications for mounting to a motor...............................................................25
9.2 Specifications for mounting to a machine ..........................................................26
9.2.1 Specifications for mounting with through-holes.............................................26
9.2.2 Specifications for mounting with slotted holes...............................................27
9.2.3 Specifications for mounting with threaded holes ...........................................27

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9.3 Specifications for mounting to the output side................................................... 28
9.4 Specifications for startup and operation ............................................................ 29
9.5 Tightening torques for common thread sizes in generalmechanical engineering .................................................................................... 30

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1

About this manual

About this manualThis operating manual contains necessary information to safely operate the gearbox.
If this manual is supplied with any amendments (e.g. for special applications), the information in theamendments is primarily and exclusively valid.
WITTENSTEIN alpha GmbHprovides this manual for all production sites worldwide. The
manufacturer of the product is indicated on the name plate (see chapter 3.2 "Name plate").
The operator must ensure that all persons assigned to install, operate, or maintain the gearbox haveread and understood these instructions in full.
Store these instructions within reach of the gearbox.
Inform colleagues who work in the area around the machine about the safety and warning notices
to avoid injuries.
The original instructions were prepared in German; all other language versions are translations ofthese instructions.

1.1

Information symbols and cross references
The following information symbols are used: Indicates an action to be performed
 Indicates the results of an action
 Provides additional information about the action
A cross reference refers to the chapter number and the header of the target section(e. g. 2.3 "Intended use").
A cross reference on a table refers to the table number (e. g. Table "Tbl-15").

1.2

Scope of delivery
 Check the completeness of the delivery against the delivery note.
 Missing parts or damage must be notified immediately in writing to the carrier, theinsurance company, or WITTENSTEIN alpha GmbH.

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Safety
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SafetyThese instructions, especially the safety and warning notices and the rules and regulations valid forthe operating site, must be observed by all persons working with the gearbox.
The following, especially, must be strictly adhered to: Observe the instructions for transport and storage.
 Use the gearbox only in accordance with its intended use.
 Carry out maintenance and repair work appropriately and professionally in conformity with thespecified intervals.
 Always mount, dismantle, and operate the gearbox properly (e.g. even test run only withsecure mounting).
 The manufacturer of the higher-level machine shall, in accordance with its risk assessment,
install protective devices and equipment as appropriate to protect the user from the residual
hazards of the gearbox. Only operate the gearbox with intact and active protective devices
and equipment.
 Only operate the gearbox with the correct lubricant (type and amount).
 Prevent the gearbox from becoming extremely soiled.
 Only carry out modifications or reconstructions when these are approved in writing by the
WITTENSTEIN alpha GmbH.
Personal injuries or material damage, or other claims arising from non-observance of theseminimum requirements, are the sole responsibility of the operator.
In addition to the safety-related information in this manual, also observe any legal and otherwise
applicable rules and regulations, particularly for accident prevention (e.g. personal safety
equipment) and environmental protection.

2.1

Product conformity

2.1.1 European Union (EU)
Machine safety
The gearbox is within the scope of Directive 2006/42/EC on machinery. According to the Machinery
Directive, the gearbox is classified as partly completed machinery. For this reason, it does not beara CE mark with reference to the Machinery Directive.
The partly completed machinery must not be put into operation before it is verified that themachinery in which the partly completed machinery is to be incorporated complies with theregulations of the Machinery Directive.
The declaration of incorporation for this gearbox can be found in chapter 9 "Appendix".
2.1.2 United Kingdom (GB)Machine safety
The gearbox is within the scope of the regulation S.I. 2008 No. 1597, Supply of Machinery (Safety)
Regulations 2008 According to the Supply of Machinery (Safety) Regulation, the gearbox isclassified as partly completed machinery. For this reason, it does not bear a UKCA mark withreference to the Supply of Machinery (Safety) Regulation.
The partly completed machinery must not be put into operation before it is verified that themachinery in which the partly completed machinery is to be incorporated complies with theregulations of the Supply of Machinery (Safety) Regulation.
The declaration of incorporation for this gearbox can be found in chapter 9 "Appendix".

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Safety2.2

Personnel
Only technicians who have read and understood this operating manual may perform work on the
gearbox. Based on their training and experience, technicians must be able to evaluate the tasks
assigned to them, in order to recognize and avoid risks.

2.3

Intended use
The gearbox serves to convert torques and speeds. It is suitable for industrial applications.
The gearbox may not be operated in areas with potentially explosive atmosphere.
In areas coming into contact with the product in the food processing / pharmaceutical / cosmetics
industry, the gearbox may only be used next to or under the product area.
 For direct use in the food sector, provide encapsulation of the gearbox and perform a hygiene
risk assessment (in accordance with DIN EN 1672-2).
Product-specific deviations regarding the positioning and mounting position are described inchapter 3 "Description of the gearbox".
The gearbox has been constructed according to current technological standards and acceptedsafety regulations.
 To avoid any hazard to the operator or damage to the machine, use the gearbox only inaccordance with its intended use and in a technically flawless and safe condition.
 If you notice any altered operating behavior, check the gearbox in accordance withchapter 8 "Malfunctions".
 Read the general safety instructions before starting any work (see chapter 2.5 "General safety
instructions").
The gearbox is intended for installation on motors that:- correspond to the design B5 (in the event of deviations, consult our Customer Service
department [Technical Customer Service department]).
- have a radial and axial runout tolerance according to DIN EN 50347.
- have a cylindrical shaft end with tolerance class h6 to k6.
 For motor shaft diameter 55 mm and up, m6 is also permissible.
Screw connections between gearbox and attached component such as motors have to be
calculated, dimensioned, mounted, and tested according to current technological standards. Use
the VDI directives VDI 2862 sheet 2 and VDI 2230 for example.
 The tightening torques recommended by us can be found in Chapter 9 "Appendix".
Deviating from the recommendations in Chapter 5 "Assembly", washers may be used if the materialof the screw surface features a too low interface pressure.
 The hardness of the washer needs to match the property class of the screw.
 Take into account the washer for the screw calculation (joint, additional compression set,
surface pressure under screw head and under washer).

2.4

Reasonably foreseeable misuse
Any use is prohibited if- it contradicts the requirements of chapter 2.3 "Intended use",- it exceeds the permissible technical data, e.g. speed, force and torque load, temperature,service life (see also chapter 3.4 "Dimensions and performance data").

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2.5

General safety instructions
The operation of the gearbox involves residual risks even when adhering to the intended use.
Rotating components can cause serious injuries: Before startup, remove objects, loose components (e.g. feather keys), and tools from thegearbox, in order to avoid danger from thrown parts.
 Keep a sufficient distance to moving machine components when the gearbox is running.
 Secure the higher-level machine against restarting and unintentional movements duringassembly and maintenance work (e.g. uncontrolled lowering of lifting axes).
A hot gearbox can cause serious burns:
 Touch the hot gearbox only with protective gloves.
The noise emissions can cause hearing damage. The continuous noise pressure level may vary
according to product type and gearbox size: Information about your gearbox is available in the customized performance data (X093–D...),
in the catalog under www.wittenstein-alpha.de, or from our Customer Service / Sales
department.
 For noise protection measures, observe the total noise pressure level of the machine.
Loose or overloaded screw connections can cause damage to the gearbox:
 Use a calibrated torque wrench to tighten and check all screw connections for whichtightening torques have been specified.
Solvents and lubricants are flammable, can cause skin irritation, and can pollute soil and water: In case of fire: Do not use a jet of water to extinguish.
 Suitable extinguishing agents are powder, foam, water mist and carbon dioxide. Observe
the safety instructions of the lubricant manufacturer (see Chapter 3.5 "Information about
the lubricant").
 Use protective gloves to avoid direct skin contact with solvents and lubricants.
 Use and dispose of cleaning solvents and lubricants properly.
A damaged gearbox can cause accidents and injury:
 Immediately shut down a gearbox that has been overloaded due to misuse or a machinecrash (see Chapter 2.4 "Reasonably foreseeable misuse").
 Replace the damaged gearbox, even if no external damage is visible.

2.6

Structure of warning instructions

B

A

C

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D

Warning instructions are situation-specific. They
will be precisely where tasks are described inwhich dangers can arise.
The warning instructions in this manual aredesigned according to the following pattern:
A = Safety symbol (see Chapter 2.6.1 "Safety
symbols")
B = Signal word (see Chapter 2.6.2 "Signal words")
C = type and consequence of danger
D = avoiding danger

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2.6.1

2.6.2

SafetySafety symbols
The following safety symbols are used to indicate possible hazards, prohibitions, and important
information:

General hazard

Hot surface

Environmental
protection

Information

Suspended loads

Entanglement

Signal words
The following signal words are used to indicate possible hazards, prohibitions, and important
information:

This signal word indicates an imminent danger that will cause serious
injuries or even death.

This signal word indicates a potential hazard that could cause serious
injuries and even death.

This signal word indicates a potential hazard that could cause minor
or serious injuries.

This signal word indicates a potential hazard that could lead tomaterial damage.
A note without a signal word indicates application hints or especially
important information for handling the gearbox.

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Description of the gearbox
3

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Description of the gearbox
The gearbox is a single- or multi-stage low-backlash gear that can be used in any mounting
position.
For applications with special safety requirements (e.g. vertical axes, distorted gear inputs) we
recommend using exclusively our products XP+, RP+, SP+, TP+, TP+ HIGH TORQUE or consulting
WITTENSTEIN alpha GmbH.
Various types of motors can be accommodated using an adapter plate and, where necessary, abushing.
 Also check the permissible static tilting moment exerted by the motor(see chapter 9.1 "Specifications for mounting to a motor").

3.1

Overview of gearbox components
Gearbox components

NP

NPS

B
Q

B

E
NPT / NTP

E
NPL

Q

E

Gear housing

Q

Output shaft / Output flange

B

Adapter plateQ

B

Tbl-1: Overview of gearbox components NP / NPL / NPR / NPS / NPT / NTP

Gearbox components

NPSK

NPK E
Q

B

E NPLK

B

E

Gear housing

Q

Output shaft / Output flange

B

Adapter plate

Q

Q

E

B

NPTK

Tbl-2: Overview of gearbox components NPLK / NPRK / NPSK / NPTK

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Description of the gearbox
Gearbox components

CP

CPS

B
Q

E

Gear housing

Q

Output shaft / Output flange

B

Adapter plate

Q
E

B
E

Q
B

CPK
Tbl-3: Overview of gearbox components CP / CPK / CPS / CPSK

3.1.1

Version with through-holes
Gearbox components
M

M

Through-holes (see Chapter 5.3.1 "Mounting withthrough-holes")M
M
Tbl-4: Version with through-holes

3.1.2

Version with slotted holes
Gearbox components

M
N

M

Slotted holes (see Chapter 5.3.2 "Mounting with slottedholes")N

Pin holes (optional)

M

Tbl-5: Version with slotted holes

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3.1.3 Version with threaded bores
Gearbox components
M

Threaded holes (see Chapter 5.3.3 "Mounting withthreaded bores")M

Tbl-6: Version with threaded bores

3.2

Name plate
The name plate is attached or lasered to the gearbox housing or the input flange.
Designation

A

B
i=

xxxxxxx xxx
Mat. No.: 23456789
SN:
1234567
Lubrication: xxx

xx

DMF: 06/20
Made in xxx

WITTENSTEIN xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

D

E

F

H

Code: xxx

C

G

A

Ordering code
(see Chapter 3.3 "Ordering code")

B

Ratio iC

Customer material number (optional)

D

Serial number

E

LubricantF

Production dateG

DataMatrix code (access to
WITTENSTEIN Service Portal)

H

Code (identifier and entry
WITTENSTEIN Service Portal)

Tbl-7: Name plate (sample values)

3.3

Ordering code

xxxxxxx x - x x x - xxxxx - x x x - x x xxxxx
Product type

optional

Characteristic

Motor connection

Gearbox variant

Generation

Gearbox model

Backlash

Number of stages

Clamping hub diameter

Ratio

Output shapeMore information is available in our catalog or at www.wittenstein-alpha.de.

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3.4

Description of the gearbox

Dimensions and performance data
The dimensions, the maximum permissible speeds and torques, and information on the service life
can be found- in our catalog,- at www.wittenstein-alpha.de,- in the specification software cymex®,- in the respective customized performance data (X093–D...).
 Consult our Customer Service department if the gearbox is older than a year. The user will thenreceive the valid performance data.

3.5

Information about the lubricant
All gearboxes are permanently lubricated by the manufacturer withsynthetic gear oil (polyglycols) or with a high-performance grease (seeidentification plate). All bearings are lubricated for life at the factory.

3.6

Notes regarding the IP protection class
The products comply with the protection class according to thecatalog in accordance with EN 60529. Except for special versions, they
are not corrosion-protected and must be operated in a clean, dust-freeand dry environment. Moisture penetration in the area of the drive is
inadmissible. In this connection, we recommend additional protection
measures or alternative products.

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Transport and storage

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4

Transport and storage

4.1

Packaging
The gearbox is delivered packed in foil and cardboard boxes.
 Dispose of the packaging materials at the recycling sites intended for this purpose. Observe
the applicable national regulations concerning disposal.

4.2

Transport

Suspended loads can fall and can cause serious injuries and evendeath.
 Do not stand under suspended loads.
 Secure the gearbox before transport with suitable fasteners (e.g. belts).

Impacts, for instance from falling or hard dropping, may damage thegearbox.
 Only use hoisting equipment and lifting accessories with sufficient
capacity.
 Never exceed the maximum permissible load for hoisting equipment.
 Lower the gearbox slowly.
The table "Tbl-8" specifies the maximum gearbox weights. Depending on the version, the actual
weight can be considerably less.
Gearbox size C...

005

015

025

035

045

Maximum weight [kg]

0.92

1.8

4.5

10

21

Gearbox size N...

005

015

025

035

045

Maximum weight [kg]

1.7

3.0

6.5

14

24

Tbl-8: Maximum weight [kg]

4.3

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Storage
Store the gearbox in horizontal position and dry surroundings at a temperature of 0 °C to +40 °C in
the original packaging. Store the gearbox for a maximum of 2 years. Consult our Customer Service
department if the conditions are different.
For storage logistics, we recommend the "first in - first out" method.

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5Assembly

AssemblyRead the general safety instructions before beginning to work (see Chapter 2.5 "Generalsafety instructions").
 If you have questions about correct mounting, consult our Customer Service department.
5.1

Preparations

Pressurized air can damage the gearbox seals.
 Do not use pressurized air to clean the gearbox.
Directly sprayed cleaning agents can alter the frictional values of theclamping hub.
 Only spray cleaning agents onto a cloth for wiping off the clamping hub.
Operation without an adapter plate might lead to damage.
 Only install your own adapter plate or replace an adapter plate according
to the specifications of WITTENSTEIN alpha GmbH. Our Customer
Service department will provide you with disassembly instructions for thispurpose.
 Operation without an adapter plate is prohibited.
In rare cases, seeping may occur at the drive (slight, non-continuous
discharge of lubricant). This does not apply to gearboxes in Hygienic
Design.
For optimized sealing of the motor / gearbox interface, we recommend
sealing the surfaces between- the adapter plate and drive housing (gearbox), as well as between- the adapter plate and motor,
using a surface sealing adhesive (e.g. Loctite® 573 or 574).
 For further information, see the separate manuals "Adapter plate
replacement" (doc no. 2022-D063062) and "Adapter plate with sealing
adhesive" (doc no. 2098-D021746). The manual will be provided by ourSales / Customer Service department on request. Always state the serial
number when making the request.
Make sure that the motor meets the requirements in chapter 2.3 "Intended use".
 Select the screws for fastening the motor to the adapter plate according to the motor
manufacturer's specifications. Observe the minimum screw-in depth in relation to the property
class (see table "Tbl-9").
Property class of screws for fastening the motor
Minimum screw-in depth

8.8

10.9

1.5 x d 1.8 x d

Ax-70

Ax-80

1.5 x d (*)

d = Screw diameter(*) Only use a tool that is suitable for working with stainless steel. Valid only for products inHygienic Design: Use suitable screw head seals.
Tbl-9: Minimum screw-in depth of screws for fastening the motor to the adapter plate

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Assembly

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

Clean / degrease and dry the following components using a clean and lint-free cloth and agrease-dissolving, non-aggressive cleaning agent:- All fitting surfaces to neighboring components- Centering- Motor shaft- Inner diameter of clamping hub- Bushing, inside and out Dry all fitting surfaces to neighboring components to achieve the proper friction values for thescrew connections.
 In addition, check the fitting surfaces for damage and impurities.
 Check whether all corrosion protection was removed from all extern components without any
residues.
5.2

Mounting the motor to the gearbox
 Only the “self-contained version” gearbox
variant with a drive shaft [O] is not intended for
motor mounting. It is possible to drive thegearbox directly via the drive shaft, e.g. bymeans of a belt pulley.
For all gearboxes with motor-mounting, thefollowing information applies:O

Observe the specifications and safety instructions of the motor
manufacturer.
 Observe the safety and processing instructions for the threadlocker to be
used.
Valid only for corrosion resistant gearboxes and gearboxes inHygienic Design: Adjust the fitting surface to the gearbox before mounting the motor.
 For corrosion-resistant gearboxes, use sealing adhesives(e.g. Loctite® 573) to avoid any ingress of foreign media.
 Place an appropriate sealing ring between the adapter plate and motor
for gearboxes in Hygienic Design to avoid any ingress of foreign media.
 In addition, WITTENSTEIN alpha GmbH offers a suitable sealing plate.
For more information, please see the separate manual for "Sealing plate
installation" (doc. no 2098–D038000).
The manual can be found in the download area on our website
www.wittenstein-alpha.de.

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Assembly

XX Nm
TA
C

The tightening torque value [TA] of the clamping bolt
[H] can be found on the clamping hub [C].
 The value for the tightening torque can also befound in Chapter 9.1 "Specifications for mounting
to a motor".

H
C



D

F
C
H
E

TA

Preferably, the motor should be mounted in a verticalorientation.
 Remove the locking screw / set screw / stopper plug [A] fromthe mounting bore in the adapter plate [B].
 Rotate the clamping hub [C] until the clamping bolt [H] canbe reached via the mounting bore.
 Loosen the clamping bolt [H] of the clamping hub [C] by one
revolution.
 Slide the motor shaft into the clamping hub of the
gearbox [E].
 The motor shaft should slide in easily. If this is not the case,the clamping bolt needs to be loosened some more.

BA If the clamping bolt [H1] is loosened too far or removed, the clamping ring [I] can rotate on theclamping hub. Align it so that the clamping bolt [H1] is in the keyway of the clamping hub(see table "Tbl-10").
 For certain motor shaft diameters and applications, a slotted bushing needs to be installed inaddition.
 For the version with clamping bolt, eccentrical [H1]:
The slot of the bushing (if present) and the clamping hub must be flush with the groove (ifpresent) of the motor shaft; see Table "Tbl-10".
For the version with clamping bolt, centrical [H2]:
The slots of the bushing (if present) and clamping hub have to be aligned with the keyway (ifpresent) of the motor shaft and rotated 90° from the clamping bolt, see Table "Tbl-10".
 No gap is permitted between the motor [D] and the adapter plate [B].

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Assembly

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Designation

H1

J
H2

I

K
L

I

H1

Clamping bolt, eccentrical

H2

Clamping bolt, centricalI

Clamping ringJ

Bushing

K

Keyed motor shaft

L

Motor shaft with shaft key

L1

Shaft key

L1

K

Tbl-10: Arrangement of motor shaft, clamping bolt and bushing

Apply threadlocker (e. g. Loctite® 243) to the four screws [F].
 Fasten the motor [D] onto the adapter plate [B] with the four screws. Evenly tighten the screws
crosswise with increasing torque.
 Tighten the clamping bolt [H] of the clamping hub [C].
 The value for the tightening torque can also be found in Chapter 9.1 "Specifications for
mounting to a motor".
 For version with- sealing plug, push it into the adapter plate [B] all the way to the stop.
- locking screw [A1], screw it into the adapter plate [B].
- locking screw with screw head seal [A2] (Hygienic Design only), screw it into the adapter
plate [B].
- set screw [A3], screw it flush into the adapter plate [B].
 For screw size and specified tightening torque, see table "Tbl-11".
[A]

Width across flats [mm]Tightening torque [Nm]
3

5

6

8

10

12

13

17

A1

Locking screw

–

10

–

35

50

70

–

–

A2

Locking screw withscrew head seal
(Hygienic Design only)

–

–

–

–

3

–

5

5.5

A3

Set screw

1.5

3

3

6

–

–

–

–

Tbl-11: Tightening torques for the locking screw / set screw

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5.3

Assembly

Mounting the gearbox on a machineObserve the safety and processing instructions for the threadlocker to be
used.

Center the gearbox in the machine bed.

Apply threadlocker (e.g. Loctite® 243) to the fastening screws.
 Mount the gearbox so that the name plate can still be read.
 The specified screw sizes and tightening torques can be found in Chapter 9.2 "Specifications
for mounting to a machine".
 If your gearbox is equipped with a liquid-cooled adapter plate, the separate instructions"Cooled adapter plate" (doc. no. 2022–D063351) applies. The manual will be provided by ourSales / Customer Service department on request. Please always provide the serial number.
 We recommend applying a clearance fit between the mounting flange and centering collar of
the gearbox. The mounting flange should have a minimum tolerance of H7.
The following applies only for Hygienic Design: Install the gearbox so that the locking screw faces downwards. This makes cleaning easier.
 WITTENSTEIN alpha GmbH offers corresponding mounting kits for this. The separate
instructions "Hygienic Design Instruction Sheet, Mounting Kit" (Doc. no. 2022–D062618) apply
to this. The manual will be provided by our Sales / Customer Service department on request.
Please always provide the serial number.


5.3.1

Mounting with through-holes If your gearbox is equipped with reverse centering for motorside installation [M] on a machine, you will find more
information in the separate manual "Reverse centering device
for motor-side installation" (doc. no. 2022–D063062). The
manual will be provided by our Sales / Customer Service
department on request. Please always provide the serial
number.

M

M

M

Revision: 04

 We recommend doing without washers as long as thematerial of the screw surface features sufficient interfacepressure.
 Fasten the gearbox on the machine with the fastening screws
through the through-holes [M].

M

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Assembly
5.3.2

NP.. / NTP / CP..

Mounting with slotted holes
 Use only the washers included with the delivery for fastening the gearbox to the machine (seeChapter 9.2 "Specifications for mounting to a machine").

M

The gearbox can be optionally equipped with an output pinion

M [P1]. The gearing backlash between output pinion and toothedrack / counter-wheel can be adjusted using the slotted holes [M]and the lateral guides. An additional adjustment mechanism is nolonger necessary.
 Detailed information on the design of the gearbox interface isavailable on request.
 For the proper setting of the gearing backlash, you will findfurther information in the "alpha rack and pinion system"
manual (doc. no. 2022–D001333). The manual will be provided
by our Sales / Customer Service department on request.
Please always provide the serial number.

P1

Operating the gearbox without a motor (e.g. using a hand wheel) is
permitted for setting / aligning the output pinion on the toothed rack.
 When doing so, ensure never to tilt / bend the clamping hub.
Slide the washers onto the fastening screws.
 Fasten the gearbox to the machine with thefastening screws through the slotted holes [M].

M

Pinning the mounted and aligned gearbox (optional)

N

en-18

Optionally, there are two bore holes [N] on the gear housing for pinning
the gearbox to the machine. You can fasten the gearbox to the machinewith cylinder pins.
 Drill pin holes into the machine bed according to the bores [N] of thegear housing.
 Ream the bores to the corresponding fit size for the cylinder pins.
 For specifications on the cylinder pins, refer to
Chapter 9.2 "Specifications for mounting to a machine".
 Fasten the gearbox with the cylinder pins.

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5.3.3

Mounting with threaded bores

M

5.4

Assembly We recommend doing without washers as long as thematerial of the screw surface features sufficient interfacepressure.
 Fasten the gearbox to the machine with the fastening screws
through the threaded bores [M].

Components mounted to the output side
The output side has different shapes depending on the product type:- Smooth shaft- Shaft with key- Splined shaft (DIN 5480)- Blind hollow shaft / hollow shaft / hollow shaft interface / flanged hollow shaft- Flange- with mounted output pinion
 For details on mounting to the blind hollow shaft / hollow shaft / hollow shaft interface,refer to the instructions in chapter 5.4.1 "Mounting with shrink disk".
 For details on mounting to the flange / flanged hollow shaft / keyed hollow shaft, refer tothe instructions in chapter 9.3 "Specifications for mounting to the output side".
 The following only applies to corrosion-resistant gearboxes with a hollow shaft: Observe
the further instructions on sealing in chapter 9.3 "Specifications for mounting to the output
side".

Tension during assembly may damage the gearbox.
 Mount the mounting parts onto the output shaft / output flange without
using force.
 Never attempt to assemble by force or hammering!
 Only use suitable tools and devices for assembly.
 Make sure not to exceed the maximum permissible static axial forces on
the output bearing (see Chapter 9.3 "Specifications for mounting to the
output side") when pulling or shrink-fitting a mounting part onto the output
side.
WITTENSTEIN alpha GmbH offers corresponding mounting kits for gearboxes in Hygienic
Design. The separate instructions "Hygienic Design Instruction Sheet, Mounting Kit" (Doc. no.
2022–D062618) apply to this. The manual will be provided by our Sales / Customer Service
department on request. Please always provide the serial number.

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Assembly

NP.. / NTP / CP..

5.4.1 Mounting with shrink disk

P
Q

P
Q

en-20

The slip-on shaft / hollow shaft / hollow shaft interface [Q] is axiallysecured to the load shaft by means of a shrink disk connection. If agearbox with shrink disk [P] was ordered, then it is already mounted.
 If a different shrink disk is used, observe the instructions of the
manufacturer.
 With the recommended fit size h6 for the load shaft, it must be possible
to push the disk on without exerting force, but without a noticeable fit
tolerance. The required dimensions for the slip-on shaft /hollow shaft / hollow shaft interface are found in the catalog (see also
Chapter 3.4 "Dimensions and performance data").
 Further important instructions on how to handle the shrink disk arefound in the separate manual "Shrink disk" (Doc. no. 2022–D063039).
The manual will be provided by our Sales / Customer Service
department on request. Please always provide the serial number.

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6

Startup and operation

Startup and operation


Read the general safety instructions before beginning to work (see Chapter 2.5 "Generalsafety instructions").
Improper use can cause damage to the gearbox.
 Ensure that- the ambient temperature is in the permissible range (see Chapter 9.4 "Specifications forstartup and operation") and- the operating temperature does not exceed +90 °C.
 Avoid freezing, which can damage the seals.
 Use the gearbox only in a clean, dust-free, and dry environment. Moisture penetration in thearea of the drive in particular is inadmissible. In this connection, we recommend additional
protection measures or alternative products.
 Only use the gearbox up to its maximum limit values, see Chapter 3.4 "Dimensions andperformance data". For other conditions of use, consult our Customer Service department.
For use of shrink discs, including those made of stainless steel, the following applies: Use only halogen-free (especially chloride-free) cleaning agents for cleaning.
The following only applies for corrosion-resistant gearboxes:- The pump effect of a running gearbox can suck cleaning agents into the gearbox. The
gearbox may only be cleaned when it is installed and at standstill.
- To avoid corrosion, use only conventional cleaning agents that are grease-dissolving but not
aggressive.
- High-pressured water jets can damage the gearbox seals and thus lead to leakage.
 Never aim the water jet directly at the seals.
 Attach a deflector in front of the seals if necessary.
Valid only for gearboxes in Hygienic Design:- The pump effect of a running gearbox can suck cleaning agents into the gearbox. The
gearbox may only be cleaned when it is installed and at standstill.
- High-pressured water jets can damage the gearbox seals and thus lead to leakage.
 Use a water jet with a maximum pressure of 28 bar.
- A roughened surface cannot be cleaned without leaving residues.
 Take care not to scratch the gearbox.
 Remove applied media from the sealing of the gearbox within 30 minutes.
 Thoroughly clean the gearboxes over its entire circumference, i.e. everywhere.
 Clean the gearbox with a maximum water temperature of 80 °C.
 Use only cleaning processes as described in chapter 9.4 "Specifications for startup andoperation".
The following only applies to servo worm gearboxes: When using the gearbox in continuous operation, observe the further instructions given in
Chapter 9.4 "Specifications for startup and operation".

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Maintenance and disposal
7

Maintenance and disposal


7.1

NP.. / NTP / CP..

Read the general safety instructions before beginning to work (see Chapter 2.5 "Generalsafety instructions").

Maintenance schedule
Maintenance work

At startup

For the first time after
500 operating hours
or 3 months

Every
3 months

Visual inspection

X

X

X

Checking thetightening torquesX
Tbl-12: Maintenance schedule

7.2

Maintenance work

7.2.1 Visual inspection
 Check the entire gearbox for exterior damage.
 Seals are subject to wear. Therefore, also check the gearbox for leakage during each visualinspection.
 Clean / degrease and dry the seals using a clean and lint-free cloth and agrease-dissolving, non-aggressive cleaning agent: Minimize mechanical effects.
 Check the mounting position to ensure that no foreign media (e.g. oil) or particles(e.g. chips) have collected on the output shaft / output flange.
 The following only applies for corrosion-resistant gearboxes: Check the lacquer layer andthe nickel-plated surfaces for damages and corrosion.
 Valid only for gearboxes in Hygienic Design: Make sure that there is no damage /unevenness or corrosion at any of the surfaces.
7.2.2 Checking the tightening torques


Check the tightening torque of the clamping bolt [H] on the
motor mounting. If, while checking the tightening torque, you
discover that the clamping bolt can be turned further, tighten it
to the prescribed tightening torque.
 The value for the tightening torque can also be found in
Chapter 9.1 "Specifications for mounting to a motor".

H
Screw connections between gearbox and attached component such as motors have to be
calculated, dimensioned, mounted, and tested according to current technological standards. Use
the VDI directives VDI 2862 sheet 2 and VDI 2230 for example.
 The tightening torques recommended by us can be found in Chapter 9 "Appendix".
Deviating from the recommendations in Chapter 5 "Assembly", washers may be used if the materialof the screw surface features a too low interface pressure.
 The hardness of the washer needs to match the property class of the screw.
 Take into account the washer for the screw calculation (joint, additional compression set,
surface pressure under screw head and under washer).

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Maintenance and disposal

7.3

Startup after maintenance work
 Clean the outside of the gearbox. For use of shrink discs, including those made of stainlesssteel, the following applies: Use only halogen-free (especially chloride-free) cleaning agentsfor cleaning.
 Attach all safety devices.
 Do a trial run before releasing the gearbox again for operation.

7.4

Disposal
Consult our Customer Service department for supplementary information on disassembly anddisposal of the gearbox.
 Dispose of the gearbox at the recycling sites intended for this purpose.
 Observe the applicable national regulations concerning disposal.

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Malfunctions
8

NP.. / NTP / CP..

Malfunctions

Changed operational behavior can be an indication of existing damage
to the gearbox or can cause damage to the gearbox.
 Do not put the gearbox back into operation until the cause of themalfunction has been rectified.
Rectifying of malfunctions may only be done by specially trained
technicians.

Fault

Possible cause

Solution

Increased
operatingtemperature

The gearbox is not suited forthe task.

Check the technical data.

Motor is heating the gearbox.

Check the wiring of the motor.
Ensure adequate cooling.
Change the motor.

Increased
operatingnoisesAmbient temperature
too high.

Ensure adequate cooling.

Tension in motor mounting

Consult our Customer Service department.

Damaged bearings
Toothing damage

Loss oflubricantSeeping

Wipe off discharged lubricant and continue tomonitor the gearbox. Lubricant discharge shouldstop after a short time.

Seals not tightConsult our Customer Service department.
Tbl-13: Malfunctions

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Appendix

9

Appendix

9.1

Specifications for mounting to a motor
 Observe the maximum permissible static tilting moment due to the motor M1KMot, especiallywhen the motor is mounted horizontally (xx/B5).
 For more information see our catalogue at www. wittenstein-alpha.de or contact ourCustomer Service department / Sales department.
Clamping hub Ø [mm]Maximum permissible static tilting
moment due to the motor [Nm]M1KMot

11

14

19

28

38

5.5

7

18

55

130

Existing tilting moment in case of horizontal mounting position B5 and symmetrical weight
distribution of the motor: M1kMot = motor weight [kg] x 4.9 x motor length [m]Tbl-14: Maximum permissible static tilting moment due to the motor

Designation
H1

H2

H1

Clamping bolt, eccentrical

H2

Clamping bolt, centricalTbl-15: Arrangement of motor shaft, clamping bolt and bushingOrdering code: xxxxxxxx-xxx-xxxxx-x(.)*x-xx (see Chapter 3.2 "Name plate")
Clamping hub Ø 1)
[mm]

(.)*
Code letter

Width across
flats
[mm]

8

Z

9

Tightening torque [Nm]Clamping bolt,
eccentrical H1

Clamping bolt,
centrical H2

2.5

2

-

A

2.5

2

-

11

B

3

4.1

6

14

C

4

9.5

14

16

D

5

14

-

19

E

5

14

29

24

G

6

35

52

28 2)

H

5

14

-

28 3)

H

8

-

52

32

I

8

79

-

38

K

8

79

-

48

M

10

135

-

55

N

10

135

-

60

O

14

330

-

1) The availability of particular clamping hub diameters can be found in the catalog.
2)

only applies to clamping bolt, eccentrical [H1]3) only applies to clamping bolt, centrical [H ]2
Tbl-16: Tightening torque for clamping bolt

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Appendix
9.2

NP.. / NTP / CP..

Specifications for mounting to a machine

9.2.1 Specifications for mounting with through-holes
Product type: NPS / NPSK
GearboxsizeHolecircle Ø[mm]Quantity x
diameter[ ] x [mm]Screw size

Tightening
torque [Nm]Property class
12.9

015

68

4 x 5.5

M5

9

025

85

4 x 6.6

M6

15.4

035

120

4x9

M8

37.5

045

165

4 x 11

M10

73.5

Tbl-17: Specifications for mounting to a machine NPS / NPSK

Product type: NPT / NPTK / NTP
GearboxsizeHolecircle Ø[mm]Quantity x
diameter[ ] x [mm]Screw size

Tightening
torque [Nm]Property class
12.9

005

67

8 x 3.4

M3

1.97

015

79

8 x 4.5

M4

4.55

025

109

8 x 5.5

M5

9

035

135

8 x 5.5

M5

9

045

168

12 x 6.6

M6

15.4

Tbl-18: Specifications for mounting to a machine NPT / NPTK / NTP

Product type: CPS / CPSK with B5 mountable flange
GearboxsizeHolecircle Ø[mm]Quantity x
diameter[ ] x [mm]Screw size

Tightening
torque [Nm]Property class
12.9

015

75

4 x 5.5

M5

9

025

100

4 x 6.5

M6

15.4

035

130

4 x 8.5

M8

37.5

Tbl-19: Specifications for mounting to a machine CPS / CPSK with B5 mountable flange

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9.2.2

Appendix

Specifications for mounting with slotted holes
Product type: NPR / NPRK
GearboxsizeHolecircle Ø[mm]Bore Ø
[mm]Screw size

Tightening
torque [Nm]Property class
12.9

015

75

6.6

M6

15.4

025

91

9

M8

37.5

035

125

11

M10

73.5

045

165

13

M12

126

Dimensions of the washers
Gearbox size

Outer Ø[mm]

Clamping length
[mm]

015

14

5

025

16

6

035

20

8

045

24

10

For this product type, no pin holes are specified.
Tbl-20: Specifications for mounting to a machine NPR / NPRK

9.2.3

Specifications for mounting with threaded holes
Product type: NP / NPK
Gearboxsize

Hole circle Ø[mm]Quantity x threadx screw depth[ ] x [mm] x [mm]Tightening
torque [Nm]Property class
12.9

005

44

4 x M4 x 8

4.55

015

62

4 x M5 x 10

9

025

80

4 x M6 x 12

15.4

035

108

4 x M8 x 16

37.5

045

140

4 x M10 x 20

73.5

Tbl-21: Specifications for mounting to a machine NP / NPK

Product type: NPL / NPLK
Gearboxsize

Hole circle Ø[mm]Quantity x threadx screw depth[ ] x [mm] x [mm]Tightening
torque [Nm]Property class
12.9

015

62

8 x M5 x 10

9

025

80

8 x M6 x 12

15.4

035

108

8 x M8 x 16

37.5

045

140

8 x M10 x 20

73.5

Tbl-22: Specifications for mounting to a machine NPL / NPLK

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Appendix

NP.. / NTP / CP..
Product type: CP / CPK
Gearboxsize

Hole circle Ø[mm]Quantity x threadx screw depth[ ] x [mm] x [mm]Tightening
torque [Nm]Property class
12.9

005

34

4 x M4 x 7

4.55

015

52

4 x M5 x 10

9

025

70

4 x M6 x 15

15.4

035

100

4 x M10 x 20

73.5

045

145

4 x M12 x 20

126

Tbl-23: Specifications for mounting to a machine CP / CPK

Product type: CPS / CPSK with long centering (without B5 mountable flange)
Gearboxsize

Hole circle Ø[mm]Quantity x threadx screw depth[ ] x [mm] x [mm]Tightening
torque [Nm]Property class
12.9

015

52

4 x M5 x 7

9

025

70

4 x M6 x 15

15.4

035

100

4 x M10 x 20

73.5

Tbl-24: Specifications for mounting to a machine CPS / CPSK with long centering

9.3

Specifications for mounting to the output side
Output flange

Product type: NPT / NPTK / NTP
GearboxsizeHolecircle Ø[mm]Quantity x thread x
screw depth[ ] x [mm] x [mm]Tightening torque[Nm]
Property class 12.9

005

25

8 x M4 x 6

4.55

015

31.5

8 x M5 x 7

9

025

50

8 x M6 x 10

15.4

035

63

12 x M6 x 12

15.4

045

80

12 x M8 x 15

37.5

Tbl-25: Thread in output flange NPT / NPTK / NTP

Maximum permitted axial forces; Fa max [N]Product typeen-28

Gearbox size
005

015

025

035

045

NP

1800

4300

5100

11300

18500

NPL

–

9250

10750

18500

31250

NPS

–

9250

10750

18500

31250

NPR

–

9250

10750

18500

31250

NPT

–

–

–

–

–

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Appendix
Maximum permitted axial forces; Fa max [N]Product typeGearbox size
005

015

025

035

045

NTP

–

–

–

–

–

NPK

1800

4300

5100

11300

18500

NPLK

–

9250

10750

18500

31250

NPSK

–

9250

10750

18500

31250

NPRK

–

9250

10750

18500

31250

NPTK

–

–

–

–

–

CP

800

1800

4300

8500

18500

CPS

–

1800

4300

8500

–

CPK

800

1800

4300

8500

18500

CPSK

–

1800

4300

8500

–

Maximum permissible static axial forces at static structural safety (s0) = 1.8
and radial force (RF) = 0
Tbl-26: Maximum permitted axial forces

9.4

Specifications for startup and operation
Ambient temperature
Product type

Minimum temperature[°C]

Maximum temperature[°C]

NP, NPL, NPS, NPR, NPT, NTP,
CP, CPS-15+40

NPK, NPLK, NPSK, NPRK,NPTK, CPK, CPSK

0+40

Tbl-27: Ambient temperature

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Appendix
9.5

NP.. / NTP / CP..

Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for headless screws and nuts are calculated values and are basedon the following conditions:- Calculation according to VDI 2230 (edition 11/2015)- Friction value for thread and contact surfaces µ=0.10- Utilization of the yield stress 90%- Torque tools type II classes A and D in accordance with ISO 6789
The settings are values rounded to usual commercial scale gradations or settings.
 Use the exact values in this table to set your tools.
Tightening torque [Nm] with thread
Propertyclass
screw / nut

M3

M4

M5

M6

M8

M10 M12 M14 M16 M18 M20 M22 M24

8.8 / 81.15 2.64

5.2

9.0

21.5 42.5 73.5 118

10.9 / 10

1.68 3.88

7.6

13.2 32.0 62.5 108

12.9 / 12

1.97 4.55

9.0

15.4 37.5 73.5 126

180

258

362

495

625

173

264

368

520

700

890

202

310

430

605

820 1040

Tbl-28: Tightening torques for set screws and nuts

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9.6

Appendix

Declaration of Conformity

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Revision history
Revision

Date

Comment

Chapter

01

09.10.2018

New version

All

02

14.12.2020

Technical documents Cover sheet03

18.03.2022

NTP

All

04

26.09.2022

general revision,
product conformity

All
2

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WITTENSTEIN alpha GmbH · Walter-Wittenstein-Straße 1 · 97999 Igersheim · Germany
Tel. +49 7931 493-0 · info@wittenstein.de

WITTENSTEIN ‒ one with the futurewww.wittenstein-alpha.de
AC: XXXXXXXX

2022-D062609Revision: 04