HE22E-001AInstruction Manual
Stainless SteelInsert Bearing Units

Table of Contents
Page

1.

Scope of application............................................................................................................................... 1

2.

Name of parts and functions .................................................................................................................. 2

3.

Selection of shafts.................................................................................................................................. 3

4.

Mounting method ................................................................................................................................... 4

5.

Installation the covers ............................................................................................................................ 5

6.

Inspection ............................................................................................................................................... 6

7.

8.

6.1

Noise ............................................................................................................................................... 6

6.2

Rise of temperature ........................................................................................................................ 6

Lubrication.............................................................................................................................................. 7
7.1

Lubrication grease .......................................................................................................................... 7

7.2

Grease replenishing method .......................................................................................................... 8

7.3

Grease replenishment amount ....................................................................................................... 9

7.4

Grease replenishment interval ..................................................................................................... 10

Replacement of bearing ........................................................................................................................11

1. Scope of application
This instruction manual applies to the insert bearing units shown in Tables 1.1 to 1.2.
Remarks: This instruction manual also applies to the insert bearing units marked with auxiliary marks (Note 1) andaggregation marks (Note 2) in addition to the standard products shown in Table 1.1 to 1.2.
(Note)

1. Special and change marks showing accuracy, shape, additional processing, etc. for bearings, housings andmain parts.
2. Abbreviated marks for special parts whose nominal number consists of many characters and is complicated.

Table 1.1
Pillow block units

Square Flangeunits

Round flangeunits withspigot joint

Rhombic flangeunits

Take-upunits

MUCP201VN,Y

MUCPA201VN,Y

MUCF201VN,Y

MUCFC201VN,Y

MUCFL201VN,Y

MUCT201VN,Y

MUCP202VN,Y

MUCPA202VN,YMUCF202VN,YMUCFC202VN,Y

MUCFL202VN,Y

MUCT202VN,Y

MUCP203VN,Y

MUCPA203VN,YMUCF203VN,Y

MUCFC203VN,Y

MUCFL203VN,Y

MUCT203VN,Y

MUCP204VN,Y

MUCPA204VN,YMUCF204VN,Y

MUCFC204VN,Y

MUCFL204VN,Y

MUCT204VN,Y

MUCP205VN,Y

MUCPA205VN,YMUCF205VN,Y

MUCFC205VN,Y

MUCFL205VN,Y

MUCT205VN,Y

MUCP206VN,Y

MUCPA206VN,YMUCF206VN,YMUCFC206VN,Y

MUCFL206VN,Y

MUCT206VN,Y

MUCP207VN,Y―MUCF207VN,Y

MUCFC207VN,Y

MUCFL207VN,Y

MUCT207VN,Y

MUCP208VN,Y―MUCF208VN,Y

MUCFC208VN,Y

MUCFL208VN,Y

MUCT208VN,Y

MUCP209VN,Y―

MUCF209VN,Y―

MUCFL209VN,Y

MUCT209VN,Y

MUCP210VN,Y―

MUCF210VN,Y―

MUCFL210VN,Y

MUCT210VN,Y

MUCP211V,Y―

MUCF211V,Y―――

MUCP212V,Y―

MUCF212V,Y―――

MUCP213V,Y―

MUCF213V,Y―――Square Flangeunits

Round flange
units withspigot joint

Rhombic flangeunits

Take-upunitsTable 1.2
Pillow block units
MUCP201VC(E),Y

MUCPA201VC(E),YMUCF201VC(E),Y

MUCFC201VC(E),Y

MUCFL201VC(E),YMUCT201VC(E),YMUCP202VC(E),Y

MUCPA202VC(E),YMUCF202VC(E),Y

MUCFC202VC(E),Y

MUCFL202VC(E),YMUCT202VC(E),YMUCP203VC(E),Y

MUCPA203VC(E),YMUCF203VC(E),Y

MUCFC203VC(E),Y

MUCFL203VC(E),YMUCT203VC(E),YMUCP204VC(E),Y

MUCPA204VC(E),YMUCF204VC(E),Y

MUCFC204VC(E),Y

MUCFL204VC(E),YMUCT204VC(E),YMUCP205VC(E),Y

MUCPA205VC(E),YMUCF205VC(E),Y

MUCFC205VC(E),Y

MUCFL205VC(E),YMUCT205VC(E),YMUCP206VC(E),Y

MUCPA206VC(E),YMUCF206VC(E),Y

MUCFC206VC(E),Y

MUCFL206VC(E),YMUCT206VC(E),YMUCP207VC(E),Y―MUCF207VC(E),Y

MUCFC207VC(E),Y

MUCFL207VC(E),YMUCT207VC(E),YMUCP208VC(E),Y―MUCF208VC(E),Y

MUCFC208VC(E),Y

MUCFL208VC(E),YMUCT208VC(E),YMUCP209VC(E),Y―MUCF209VC(E),Y―

MUCFL209VC(E),YMUCT209VC(E),YMUCP210VC(E),Y―MUCF210VC(E),Y―

MUCFL210VC(E),YMUCT210VC(E),Y12. Name of parts and functions
Rubber seal
SlingerName of parts

Functions

Grease fitting

A part to supply lubrication grease to enable the service lives of bearings to be extended by supplying grease at aninterval suitable for the use environment.

Set-screws

Secures the insert bearing and shaft.

Locking pin

Prevents the outer ring from drag turning and the section between the bearing and housing from being worn.

Rubber seal

Prevents dust and moisture from intruding because it is secured to the outer ring and the lip part comes in contact
with the inner ring.

SlingerPrevents dust from intruding by centrifugal force because it is secured to the inner ring and rotates together with theinner ring.

Insert bearing unit with pressed steel covers

2Insert bearing unit with cast-iron covers

3. Selection of shafts
Clearance fit “h” is normally applied for the dimensional tolerance between bearing inner rings and spherical in side diameterof housing. The values shown in Table 3.1 are considered appropriate for the shaft dimensional tolerance in the case ofloose press-fitting.
For high precision operation, high speed rotation, heavy and/or shock load application, interference fit is recommended forthe fit between the shaft and the bearing inner ring. When applying tight fit like this, it is recommended to follow thedimensional tolerance for the shaft as shown as per the Table 3.2. For such tight fit between the bearing and the shaft, theinitial bearing internal clearance must be larger than its standard clearance.
Table 3.1: Shaft dimensional tolerance (for loose press-fitting)
Shaft dimensional tolerance (μm)

Shaft diameter (mm)OverOr lessjs7h7h8

101818±90 to -180 to -27

30±10.50 to -210 to -33

3050±12.50 to -25

0 to -395080±150 to -30

0 to -46

Remarks: In general, js7 shall be applied.
Table 3.2: Shaft dimensional tolerance (for tight press-fitting)
Shaft dimensional tolerance (μm)

Shaft diameter (mm)OverOr lessn6n7m6m71018+23 to +12+30 to +12+18 to +7+25 to +71830+28 to +15+36 to +15+21 to +8+29 to +830

50+33 to +17+42 to +17+25 to +9+34 to +950

80+39 to +20+50 to +20+30 to +11+41 to +11

Remarks: If the shaft diameter is 30mm or less, it is better that values other than m6 are not used.

34. Mounting method
1) Slide the insert bearing unit onto the shaft slowly and bring it to the predetermined position.
2) Mount the insert bearing unit on the machine base and secure it firmly with bolts.
3) Tighten the set-screws by equal force with a hexagonal wrench key to secure the insert bearing unit to the shaft.

Remarks: 1. Before sliding the insert bearing unit onto the shaft, check that the tips of set-screws do not protrude from theinside diameter of bearing. If a tip protrudes, loosen the set-screws.
2. When sliding the insert bearing unit onto the shaft, do not allow the shaft to come in direct contact with theside of the inner ring or the slinger and use extra caution to prevent it from being twisted.
If strong impact is applied to the insert bearing unit, it is possible that the slingers on both sides may
move and come in contact with the seal. In this case, the rotation torque becomes larger, which may
cause abnormal heating and noise to be generated if the insert bearing unit is used in such condition.
After mounting the insert bearing unit, applying strong impact when mounting transmission systemparts such as pulleys, sprockets, etc. on the shaft may cause the same phenomenon, so extra
caution should be taken to prevent strong impact from being applied to the insert bearing unit.
3. The machine base on which the insert bearing unit ismounted must have high rigidity and high flatness toprevent the housing from being deformed.

Inside diameter numberFlatness

13 or less(shaft diameter: Φ65 or less)

0.1mm or less

(Excluding cartridge type and take-up type models)

4. The values shown in Table 4.1 are considered appropriate for the tightening torque.
If the set-screws is tightened excessively, deformation of the inner ring may cause the rotational
accuracy to be reduced and the inner ring to be cracked.
5. The values shown in Table 4.2 are considered appropriate for the tightening torque of housing mounting
bolts.
6. Use washers to prevent the housing from being damaged when fixing the bearing unit on the mounting basewith bolts.

Table 4.1: Appropriate tightening torque of set-screws
Bearing nominal number

Hexagonal wrench key
nominal number

Appropriate tightening torque(N･m)

MUC201V ~ MUC206V

2.5

2.4

MUC207V ~ MUC209V

33.9

MUC210V , MUC211V

48.3

MUC212V , MUC213V

516.2

Table 4.2: Tightening torque of housing mounting bolts (reference values)

4

Bolt nominal
numberTorque(N･m)Bolt nominal
numberTorque(N･m)

M5

1.7 to 2.7

M14

38 to 61M6

2.8 to 4.5

M1659 to 95

M8

6.9 to 11

M18

81 to 130M10

14 to 22M20

118 to 186

M1224 to 38--5. Installation the covers1)Attach the covers after finishing mounting the insert bearing unit.

2)

Apply an amount of grease corresponding to 1/3 to 1/2 of thevolume of the space inside the covers to that space as shown inFigs. 5.1.

Fig. 5.1: For pressed steel covers

3)

Press-fit the spigot joint of the covers into the spigot joint of the4)For cast-iron covers, secure it with hexagon bolts.

5)

For pressed steel covers, attach it by tapping the side of thehousing.

circumference with a wood hammer or plastic hammer as shownin Fig. 5.2.

Fig. 5.2: Attaching pressed steel covers

Remarks: 1. For a rubber-sealed cover to be located inside, slide it onto the shaft before mounting it on the insert bearing
unit main body.
2. To maximize dust resistance and humidity resistance, also apply grease to the spigot joint of the housing andthe shaft surface where the lip part of the rubber seal comes in contact.

5

6. Inspection
After finishing mounting the insert bearing unit, inspect whether the mounting conditions are appropriate or not.
First, turn the shaft by hand to check that the insert bearing unit rotates smoothly. If no problem is observed, rotate it byelectric power to inspect for noise or temperature increases.

6.1 Noise
Touch the housing with a listening rod or screwdriver and listen fornoises during operation to check for abnormalities. (Photo 6.1)
For normal operation conditions, a smooth rotation noise is generated,
but if there is an abnormality in mounting, an abnormal noise may begenerated.

Photo 6.1: Checking the rotation noise with a listening rod

6.2 Rise of temperature
Measure the temperature on the outer circumferences of the bearingouter ring and housing. (Photos 6.2 and 6.3)
The rise of temperature reaches saturation 2 to 3 hours after start ofoperation and the insert bearing unit reaches to the regular conditions
in general; however, if there are abnormalities in mounting, etc., thetemperature will increases excessively, which will prevents the insert
bearing unit from reaching the regular conditions. (For temperature
measurement of cartridge type bearings, measure at the side ofhousing.)
Photo 6.2: Temperature measurement (contact type)

Inspect the above items during commissioning and start operating theinsert bearing unit fully after checking that there is no abnormality.
Further, it is recommended that inspections also be performed
periodically at the predetermined interval during operation to detect
failures in the bearings at an early stage.
In addition, monitoring to check that there are no changes in noise orincreases in temperature by comparing the differences between theresults of periodic inspections and other inspections is an effective
measure for preventing accidents and damage to machinery.
For the bearing failure and its preventive measures during the test run
and the periodical inspection of the insert bearing units, please refer toour General Catalogue and/or access ASAHI WEBSITE to ‘Inspection
and Failure’.

6

Photo 6.3: Temperature measurement (non-contact type)7. Lubrication
7.1 Lubrication grease
This insert bearing has been factory-lubricated with the grease shown in Table 7.1. Therefore, it is recommended that thesame grease as the factory-lubricated grease be used.
Table 7.1: Properties of standard factory-lubricated grease
Auxiliary
mark

Type―For food machines use

For
low-temperatureresistant use

HR20CR2A

Product name

Manufacturer
nameNLGINo.

Soap-based
greaseDroppoint (°C)

Usabletemperatu
re point(°C)

Remarks

CLARION ® FOOD
MACHINERYHTEPGREASE, NO.2

CITGO
Petroleum
Corporation

2

Al-mixed

260-12 to +163―(Microgel)Approx.
250-70 to +150

Equivalent
with the level
betweenNLGI No. 1
and 2

AeroShell Grease 7

Showa Shell―Sekiyu

Type

Auxiliary
markRange of operating
temperature point (°C)

above table are the ranges for the grease.

For heat-resistant use

UL200

Normal temperature to +230

The usable temperature ranges for theFor low-temperatureresistant use

CR2A-40 to +100－-10 to +100

HR20(heat-resistant)-10 to +150

Remarks: 1. The usable temperature ranges in theinsert bearing unit are as follows:

For food machines use

2. For heat-resistant specifications, thebearing radial inside clearance has been
designed to be larger originally; therefore,clearance marks such as C3, C4, etc. areadded as auxiliary marks.

* HR23 specifications
For H23 specifications, the insert bearing chamber has been filled with fluorinated high-quality heat-resistant grease andlubrication-free insert bearing units are provided as standard.
The lubrication-free type shows all insert bearing units having specifications not equipped with a grease filling mechanism, suchas specifications using completely-lubrication-free type housings whose housing nominal number includes an auxiliary mark“G00”,specifications whose housing grease fitting hole is blocked with steel plugs. (Figs. 7.1 to 7.3)

Steel plug

Fig. 7.1: Lubrication type
insert bearing unit
Example of nominal number :MUCP205VN,Y

Fig. 7.2: Lubrication-free type
insert bearing unit (G00 specifications)
Example of nominal number :MUCP205VN-G00,Y

Fig. 7.3: Lubrication-free type
insert bearing unit
(Steel-plug filled specifications)
Example of nominal number :MUCP205VN,/SW-Y7

7.2 Grease replenishing method
Replenish grease using a grease gun (Photo 7.1) from the grease
fitting mounted on the housing. (Photo 7.2) Be careful to prevent dust
or other foreign materials from getting into the grease to be replenished.
If the grease fitting is contaminated, wipe it off before replenishing.

Photo 7.1: Grease gun

Photo 7.2: Example of filling with a grease gun

Grease is injected into the inside of the bearing from the grease holeof the outer ring through the grease groove provided on thecircumference of the spherical bearing seat from the grease fitting
replenishing port. Injected grease is stirred by the rotation of thebearing and mixed with previously-injected grease in the bearing andexcess grease is discharged from the section between the slinger andouter ring through the rubber seal lip part. (Photo 7.3, Fig. 7.4)
Photo 7.3: Normal grease discharging conditions
from inside the bearing

Re-lubrication should be performed during operation to cause thegrease to be spread into every corner of the inside of the bearing.
However, if it is difficult to replenish grease during operation because
replenishment during operation at high speed may cause dangerous
accidents, after replenishing the grease while operation is stopped,
continue to replenish while performing intermittent operation to cause
the grease to be mixed by manual operation or regular operation.
Replenishing with a large amount of grease at one time while
operation is stopped may cause the rubber seal to be peeled byinternal pressure acting on the rubber seals on both sides fromthe grease and the seals may come in contact with the slinger. In
this case, the rotation torque will increase, which may cause
abnormal heating conditions to be generated if the insert bearing
unit is operated without correcting the situation.

8Fig. 7.4: Grease circulation route7.3 Grease replenishment amountThe values shown in Table 7.2 are considered appropriate for grease replenishment amounts. If it is difficult to replenish
grease quantitatively, replenish grease until deteriorated grease comes out from the clearance between the outer ring andslinger as a reference of the replenishment amount. (Photo 7.3)
Table 7.2: Grease replenishment amount
Bearing nominal
number
MUC201V to MUC204V
MUC205V
MUC206V
MUC207V
MUC208V
MUC209V
MUC210V
MUC211V
MUC212V
MUC213V

Unit: gGrease
replenishment
amount
1.2
1.4
2.2
3.2
3.9
5.0
5.4
7.4
10.0
11.8

(Note) The replenishment amount shows the amount per one shot.

* Low torque specifications (auxiliary: TAA)
Low-torque specifications are exhibited as “TAA” in which
non-contact type rubber seals (Fig. 7.5) are used, Alvania Grease S1(NLGI No. 1) is used as the factory-lubricated grease. The
pre-lubricated grease amount is designed to be 1/3 of standard
amount; note that if grease is replenished, the amount of insidegrease increases.
Fig. 7.5: Non-contact seal

97.4 Grease replenishment interval
The recommended grease replenishment interval is shown in Table 7.3.
Table 7.3: Grease replenishment interval
Environment conditions

Bearing operation
temperature(℃)

Very clean

Very dirty

50 or less

3 years

6 months

Very dirty, very humid,much splashing
3 months

70

1 year2 months

1 month100

2.5 months

2 weeks1 week120

1.5 months

1 week3 days150

2 weeks

3 daysevery day10

8. Replacement of bearing
When replacing the insert bearing unit with a new one, if either the bearing or housing is slightly damaged, replacement ofeither one is possible instead of replacing both ones.

When assembling the bearing into the housing, position the bearing

Notched partof housing

outer ring at right angles to the bearing seat, and press-fit it into thenotched part of housing, and then turn the bearing. (Photo 8.1)

Grease holeof outer ring

Locking pinof outer ring

Photo 8.1

At this time, ensure that the outer ring locking pin is inserted into thenotched part of housing. Note that forcibly pressing the locking pin
in the bearing seat other than at the notched part may cause outerring cranking. (Photo 8.2)

Locking pin

Photo 8.2

Grease fitting hole

Further, when replenishing grease, in order to help the grease spread
into every corner of the inside of the bearing, it is recommended toGrease holeof outer ringassemble the bearing so that the grease hole of outer ring is locatednear the grease fitting of housing. (Photo 8.3)

Photo 8.3

11

MEMOJan.2023