ELECTRIC/HYDRAULIC PUMPS

UP-35RH-NC(L)UP-35RH-NO(L)UP-35RH-AR(L)
Operation and maintenance manual

NITTOH ZOHKI CO.,LTD.
102,4-10,2-Chome,Kamezawa,Sumida-ku,
Tokyo 130,Japan
Telephone.03-3625-6551
Facsimile. 03-3625-6553

INDEX
1. Safety information ---------------------------- 2
2.
3.
4.
5.
6.

Description of components ------------------ 4
Instructions before use ----------------------- 4
Operation --------------------------------------- 5
Maintenance ------------------------------------ 5
Circuits ----------------------------------------- 11

7. Construction drawings ----------------------- 11
8. Parts lists --------------------------------------- 12
9. Trouble shooting guide ----------------------- 14
10. Warranty ---------------------------------------- 15

1

page

1 Safety Information
Read and follow all WARNINGS,CAUTIONS and INSTRUCTIONS included with eachproduct to use the products correctly and to avoid personal injury or property damage duringsystem operation. NITTOH ZOHKI CANN NOT BE RESPONSIBLE FOR DAMAGE ORINJYRY RESULTING FROM UNSAFE USE OF PRODUCTS, LACK OF MAINTENANSE
OR INCORRECT SYSTEM APPLICATION.
Cautions remarks used in this manual are classified as follows;

DANGERIn case as the result of incorrect use in disregard of this remarks,
imminent danger may happen, causing the risk of death or serious
injury.

WARNING

In case as the result of incorrect use in disregard of this remarks,
there will be s possibility that an operator will die or receive aserious wound.

CAUTION

In case as the result of incorrect use in disregard of this remarks,
there will be a possibility that and operator will receive an injury or
material damage only will happen.

Cautions when installed
WARNING■Install a pump unit for better balance.
Since the reservoirs of totally enclosed rubber structure are used in this series pumps, thepumps can be placed for use in every direction (slant, inversion or perpendicular).
However, the pumps should be installed on stable places. When a pump is used aslant, fix
it firmly with. Otherwise, it slide down, causing an injury.
■Prepare good working environment.
Make sure all system components are protected form external sources of damage such as
excessive heat, flame, moving machine parts, sharp edges, corrosive chemicals.

CAUTION■Do not use the pump in the rain or on such wet or dusty places.
■Do not expose hydraulic system to the direct rays of the summer’s sun.
Be careful with unacceptable rise in hydraulic oil temperature, causing trouble ofhydraulic equipment.
■In case the pumps are used outdoors in the extremely cold regions, exchange oil forhydraulic oil of proper viscosity.
Increased viscosity due to drop in oil temperature, there is the possibility that equipment
gets out of order.

2

Caution when used
WARNING■Take safety measures.
When hydraulic equipment is operated, protect yourself with a personal safeguard,
working clothes and shoes, safety spectacles, etc.
■Always check pressure limitations of hydraulic circuit.
Always confirm in advance that max. permissible working pressure of a hydraulic pump islower than the pressure rating of the lowest rated component connected in the system.
■Be careful to avoid electric shock.
Do not pull power plug out with a wet hand. Use a grounded outlet or a plug adapter witha grounding attachment in order to protect the operator from electric shock. Do not operate
the pump by the side of electric welder or do not place it on the earthed materials or
equipment.

CAUTION■Power supply is AC220V 50/60Hz single phase.
Make sure your line voltage must be the same as the voltage your pump is wired for.
Wrong voltage connection or voltage drop of your line shall cause burning or heating.
Be careful about voltage drop when used with an electric generator.
■When the power supply is disconnected, always grasp the power plug and pull it out.
Disconnection by grasping the cord and pulling it out will cause breaking of a wire or ashort circuit.
■When a supplement cord is used, use only three-wire grounded cords of such sufficientgauge as 1.25mm2 or more, its length of max. 10M, in order to avoid voltage drop or
damage of the solenoid valves or electric motors.

Specifications
Model,No

Electric motor
Hydraulic pumpCommutator
Max,
Flow Rate
UP-35RH and open type,
Work pressure-NC(L) 0.35KW 220V
MPa
L/min(50Hz)-NO(L) 50/60Hz
2nd
2nd-AR(L) single phase,
1st stage
1st stage
stage
stage
“E” insulation,
1
70
2.0
0.2
2000rpm

3

Reservoir

WeightCapacity
1.0L(2.0L)
Usable
0.8L(1.6L)

1L
7.5Kg
2L(8.5Kg)

2 Description of components

①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩

Carying belt
Electric motor
Carbon brush
Tank cover
Relief valve
Power supply cord
Operation cord
Oil feeding plug
Delivery port PT3/8
Pendant switch

3 Instructions before use
3-1

Confirmation of all components for shipping damage or oil leakage. If any shipping
damage is found, notify carrier at once. Shipping damage is not covered by warranty.
The carrier is responsible for all repair or replacement costs resulting from damage inshipment.

3-2

Oil feeding plug
CAUTION
Oil feeding plugs (Code No.5) are always shut tightly when in shipment and even in use,
because the tanks are totally enclosed type. Use them together with quick couplers withcheck valves.

3-3 Confirmation of your power supply
WARNING
Power supply is AC110V or 220V 50/60Hz single phase. Make sure that a grounded
outlet or a plug adapter with a grounding attachment must be used.
3-4 Confirmation of hydraulic oil
WARNING
Always check oil level before operation, with the connected cylinders fully retracted(extended if pull cylinders). In case oil is added with cylinders fully extended and thencylinders are retracted, the returned oil will overflow in the reservoirs, causing
generation of high pressure in the reservoirs, confirm required oil volume in a reservoir
as follows;① Retract the connected cylinder fully.
② Pull power plug out.
③ Position the pump with the tank end down.
④ Turn oil feeding plug counter-clockwise and remove it.
⑤ Clean an oil gauge of the removed oil feeding plug witha piece of cloth and put it in the oil feeding port again
to check oil level. Be careful with O ring.
⑥ It is OK if the reservoir is filled with oil, reaching up to
the upper bound of the oil gauge. Replenish if oil isshort.(See 5-1)hydraulic oil for the details.
⑦ Replace the oil feeding plug and screw it in by turning
clockwise.
44 Operation“UP-35RH-NC” with 2-way normally closed solenoid valve, pressure holding type.
1 Plug in the pump.
2 Depress the control “ON” switch to run the motor to advance the cylinder. If the switch
is released, the motor stops and the plunger remains stopped for pressure holding.
3 To retract the plunger, depress the “OFF” switch to actuate the normally closed solenoid
valve to return the oil. Note that it is not possible to stop the plunger on the way atdescending stroke.

“UP-35RH-NO” with 2-way normally open solenoid valve, auto-return type.
1
2
3

Plug in the pump.
Depress the control “ON” switch to run the motor to actuate the normally open
solenoid valve, so the oil is delivered to advance the cylinder.
If the “ON” switch is released, the motor and solenoid valve stop and the oil is drained
to retract the plunger automatically. (The no-marked switch button is not wired anddoes not work.)“UP-35RH-AR” with differential pressure valve, auto-return type.
1
2
3

5

Plug in the pump.
Depress the control “ON” switch to run the motor to advance the plunger.
When the “ON” switch is released, the motor stops and the plunger retracts
automatically. Note that the plunger starts to retract lately one beat after the “ON”
switch is released, because the pump is fitted with the differential pressure valve,instead of a solenoid valve. (The no-marked switch button is not wired and does notwork.)

Maintenance

5-1 Hydraulic working oil① Kind of oil
Use only Nittoh NHO-32 hydraulic oil or an approved, high-grade oil (ISO #32, viscosity :32 cSt @40°C) with these pumps to promote long pump life.
② Oil temperature
Aptitude temperature for use of hydraulic oil is max. 55 ° C. In case color of thetemperature seal attached to the tank has changed and indicated “55” as below, it has
happened unacceptable rise in oil temperature. Stop working so as to decrease oils
temperature or tank such a measure as installation of an oil cooler.

Normal condition

In case unacceptable rise in oil temperature5

③ Oil exchange

CAUTION

The frequency of oil change will depend upon general working conditions, severity of use
and overall cleanliness. 300 hours (working time) of use or about 3 months is considered
as a standard change interval. Periodically compare samples oh the reservoir oil with newoil and inspects oil color for contaminants or differences.
Remove oil feeding plug and tilt the pump to drain out old oil. Be careful that such
impurities as dusts do not enter info the reservoir and new oil is filled up to the gauge
level mark shown on pump. Precautions when oil changed are;
● Retract all cylinders fully to the return position.
● Do not fill with even a small quantity of replenishment of different kinds of oil.
● Be careful that impurities or foreign matter do not enter info new oil.

④ Others

WARNING

When oil enters into a eye, wash it away fully with clean water and consult a doctor
immediately. In case oil enters into the skin of such a wound, wash it away with soapy
water and consult a doctor without delay.

5-2 Pressure and piping① Composition of hydraulic equipment system

WARNING

When a pump, high-pressure hose(s), cylinder, valve, couplings are connected together,always check product limitations regarding pressure ratings and load capacities. The
system operating pressure must not exceed the pressure rating of the lowest rated
component in the system.
② Pressure gauges
Always install or prepare a pressure gauge in-line form the pump in order to checkpressure developed.
③ Piping

CAUTION

Use wrapping of Teflon tape on hoses fittings, valves and couplers. Make sure all hoseconnections are tight-use proper tools to tighten connections with reference to thefollowing table. Do not over tighten the connections.
NPT,PT sizes
1/8”
1/4”
3/8”
1/2”

Tightening torque N-m(kgf-m)
13-14 (1.3-1.4)
30-40 (3.0-4.0)
60-70 (6.0-7.0)
100-110 (10.0-11.0)

Make sure that tape not shed into hydraulic system, causing damage. Trim loose ends.
65-3 High pressure hoses① Hose installation

WARNING

Install hoses, leaving something in reserve, because high-pressure hoses expand andcontract more or less when full pressure is applied. Be careful that the hoses do not rub
against other solid materials.
Never allow the hoses to kink, twist, curl or bend so tightly that oil flow within hoses areblocked or restricted. Do not clamp the hoses, causing troubles.

② Hose handling

DANGER

Never drop heavy things against the hoses, causing bursting of hoses or serious accident.
Do not subject the hoses to any potential hazard (fire, extreme heat or cold, heavy impact
or sharp surfaces), which might rupture or weaken the hoses. Never pull hoses to move or
lift equipment connected with hoses.
Should a hose ever burst or ruptured, immediately stop operating the pump before
attempting to remedy the situation. Never attempt to grasp a leaking hose underpressure with your hands. The force of the escaping hydraulic fluid could cause serious
and permanent injury.

5-4 Quick couplers① Connections
Make sure that all couplers are connected properly. Incomplete coupling connections
might cause partial or complete blockage of oil flow, resulting in trouble of hydraulicsystem.
② Handling

WARNING

Stop operating of the pump with a hose and coupler, but without a cylinder. The damaged
coupler will cause accident. Do not disconnect the coupler sets, which are under pressure.

7

5-5 Bleeding air from the system

CAUTION

Reservoirs of UP-35RH-Series pumps are made of totally enclosed rubber tanks and tankcovers. Rubber tanks are filled with oil, making no room for air accumulation. However, incase a new cylinder and / or new hose is connected with the pump, or oil is exchanged, air
may accumulate in the hydraulic system. This air will cause the pump not deliver oil orthe cylinder to respond in an unstable or slow manner. Be careful with air accumulationin the system. To remove this air;
① Is the tank full with oil?
Make sure that the cylinder is retracted fully (otherwise, replenishment will become toomuch, resulting in damage of the oil tank) and position the pump with the oil tank end
down as shown below. Remove the oil feeding plug and check oil volume. Replenish oil if
the oil is not full. Replace the oil feeding plug.

② In case even if the tank is full oil cannot be delivered to develop pressure, stand the pumpwith the tank end down and do inching operation (intermittent switching) with thependant switch about 10 to 11 times.

③ In case oil could not be delivered to develop pressure, place the pump horizontally (normal
position) and push the rubber bag through the hole (8mm dia.) on the tank cover end witha rod having a round end, with attention that the rubber bag does not get hurt, and at thesame time do inching operation with the pendant switch.

8

④ If the pump works normally, air in the hose, cylinder and other system is collected in thetank and oil must be replenished.

◎How air may accumulate in the pump (rubber tank) when hydraulic equipment areconnected together with? Always check and confirm before use that the oil tank is full.

9

5-6 Carbon brushes① Cautions when in use

WARNING

Always check the wearing condition of the carbon brushes. When the carbon brushes havebeen worn down and exchanging time has come, the motor will stop automatically.
Replace when a carbon brush has been worn down to 6mm in length as shown below or
working time of the motor is 150 hours or more subject to the conditions of their uses. Use
only NITTOH carbon brushes with these pumps to promote long pump life. When they
have been worn down, the spring exerts insufficient pressure to hold brush against thecommutator.

② How to changeFirstly disconnect the power supply. Remove rubber caps on two places and loosen andremove fitting screws inside with a screw driver, so the carbon brushes can be taken out.
Replace with new ones and fix the screws and rubber caps.

5-7 Relief valve adjustment① Range of standard pressure adjustment available is form 58.8 to 68.6MPa. Loosen lockscrew on the high-pressure relief valve and turn the adjusting screw a few turns
counter-clockwise to decrease pressure setting to a lower desired pressure. Clockwise
rotation of the adjusting screw will increase pressure. After setting pressure, replace thelock screw.
Different kind of a spring is needed to adjust and set at lower pressure than the standard.
Consult NITTOH authorized distributor.

106 Circuits
UP-35RH-NC Hydraulic Circuit

Electric Circuit

UP-35RH-NO Hydraulic Circuit

Electric Circuit

UP-35RH-AR Hydraulic Circuit

Electric Circuit

7 Construction drawings
11

8 Parts list
No.

Part No.

Description

Driving portion

2-17

MSWA-12-6

Screw 32-18

PT1/16Blind plug

1-1

2P50296

Base plate

2-19

4P51460

Hi pressure blind cover

1-2

AC0598A0

Oil seal

2-20

4P52529

Spacer

1-3

4P51380

Eccentric collar

2-21

4P54064Retainer H

1-4

RNAF223013

Ball bearing

1-5

φ4×28

Spring pin

1-6

4P51417

Shaft

3-1-1

4P51423

Return piston (NCNO)

1-7

MPU-100

Electric motor

3-1-2

4P51976Return piston (AR)

1-8

Gear

3-2

P-12

O ring

1-9

Key

3-3

4P51424

Accum piston

Returning portion

1-10

G-15

G ring

3-4

P-7

O ring

1-11

TLA1512Ball bearing

3-5

TM8-15

Spring

1-12

NTB1528

Thrust bearing

3-6

4P51426

Return push pin

1-13

AS1528Thrust washer

3-7

4P51425

Lever

1-14

M6×20

Set screw 1

3-8

M4

Lock nut

1-15

4P51474

Blind rubber plug

3-9

M4×20

Adjusting screw

1-16

4P53078

Leg stay3-10

MS4-40Fulcrum pin

1-17

M5×10

Fitting bolt

3-11

4P51427

Push pin 1

1-18

4P51667

Belt peg

3-12

MYA-6

Oil seal

1-19

M5×10

Fitting bolt

3-13

E-50

Set ring

Carbon brush

3-14

WM13-20

Spring3-15

φ3×8

Spring pin

3-16

4P51476

Push pin 2

1-20

Pump portion
2-1

4P51418

Low pressure piston

3-17

WL8-20Spring2-2

4P51419

Rubber washer

3-18

SUSφ1.5

Sub push pin

2-3

WH13-20

Spring

3-19

4P51462

Auto return blind plug

2-4

4P51738

High pressure piston

3-20

P-3

O ring2-5

WR5-10Spring

3-21

4P54007

Fitting plate

2-6

φ6

Steel ball

3-22

SS-102-553

DC solenoid

2-7

φ5

Steel ball

3-23

M3×5

Fitting bolt

2-8

φ5.5

Steel ball

3-24

4P51803

Pilot needle

2-9

4P51387A

Spring3-25

M6

Washer2-10

WF5-10Spring

3-26

AWS12-35

Return spring

2-11

4P51457

Retainer A

3-27

M6×20

Fitting bolt

2-12

4P51458

Retainer B

3-28

S2VB-10

Rectifier bridge

2-13

4P53933

Retainer F

3-29

M3×8

Fitting bolt

2-14

4P50636

Copper packing

3-30

M3

Nut

2-15

MSWA-12Screw 1

2-16

MSW-12Screw 2
12

Relief valve portion

5-16

G-100

O ring

5-17

M6×15

Fitting screw

4-1

Tl8-15

Relief spring low

4-2

M12×P1.5

Lock nut

4-3

4P51889

Ball receiver

4-4

TB8-15

Relief spring high

6-1

Protection tube

4-5

P-6

O ring6-2

Pendant control switch

4-6

4P51980

Relief spring retainer

6-3

Power cord

4-7

M5×5

Lock screw

6-4

3P50476

Muffler

4-8

φ2.5

Steel ball

6-5

M4×5

Fitting screw

4-9

φ1/4

Steel ball

6-6

4P51815

Dashboard 2

6-7

4P51814

Dashboard 1

Electrical parts portion

Tank portion

6-8

Cord clip

5-1

3P50374

Rubber tank 1L

6-9

M4×10

Fitting bolt

5-2

3P50375

Tank cover 1L

6-10

St4.2×9.5

Fitting bolt

5-3

4P51430

Belt peg 1L

5-4

4P53043

Leg stay 1L

5-5

C-30-CS-1

Rubber leg

7-1

4P50621

Adjusting screw

5-6

4P51520

Oil feeding plug

7-2

4P50624

Valve

5-7

P-16

O ring

7-3

4P51711

Relief valve body

5-8

4P51431

Filter

7-4

M12×P1.25

Lock nut

5-9

M6×10

Fitting screw

7-5

4P50623

Spring

5-10

3P50527

Rubber tank 2L

5-11

3P50528

Tank cover 2L

5-12

4P52413

Belt peg 2L

5-13

4P53114

Leg stay 2L

5-14

M5×10

Fitting screw

5-15

3P50529

SpacerP-relief valve portion13

9 Trouble shooting guide
WARNING●To prevent injuries, any repair work or trouble-shooting must be done by qualified personelfamiliar with this kind of equipment. Use the proper gauges and device.
Problems
Motor does not run

Possible Causes(1) No supply voltage.
(2) Broken lead wire or defective
WARNINGpower cord plug.
Disconnect power(3) Defective switches.
supply before(4) Worn carbon brushes.
disassembly or repair. (5) Defective motor.
(6) Defective remote switch.
(7) Unit is not plugged in.
Abnormal noise of (1) Damage or pump or motor.
motor.
(2) Damage of ball bearings, etc.
Motor
runs,
but (1) Damage of release valve.
cylindersdonot (2) Oil level is too low.
advance or retract.

Cylinders works, but
full pressure is not
built up.

Cylinders works, but
their speed too slow,
partially or erratically.

Cylindersretract.
Oil leaks.
Short circuit.

do

not

Remedies(1) Check line voltage.
(2) Replace defective partd.

(3) Check switches.
(4) Replace carbon brushes.
(5) Repair or replace motor.
(6) Repair or replace switch.
(7) Plug in unit.
(1) Repair or replace unit.
(2) Replace ball bearings.
(1) Repair or replace it.
(2) Fill reservoir to 1/2 of level
gauge with all cylinders
retracted.
(3) Air in system.
(3) Bleed the system.
(4) Filter plugged or dirt in pump. (4) Pump filter should becleaned and if necessary,pump should be dismantled
and cleaned.
(5) Repair pump.
(5) Damage of pump body.
(6) Damage or out of adjustment (6) Repair or readjust as needed.
of relief valve.
(1) Damage of release valve.
(1) Repair or replace.
(2) Air in system.
(2) Bleed the system.
(3) Damage of pump body.
(3) Repair pump.
(4) Lowering of set pressure or (4) Readjustment of set pressuredamage of relief valve.
or repair of relief valve.
(1) Damage of release valve.
(1) Repair or replace.
(2) Air in system.
(2) Bleed the system.
(3) Unacceptable rise in oil (3) Stop operation or install oil
temperature.
cooler. (max. 55℃)
(4) Damage of pump body.
(4) Repair pump.
(1) Damage of release valve.
(1) Repair or replace.
(2) Damage of return springs of (2) Repair or replace springs or
cylinders or quick couplers.
couplers.
Damage seals, seats or steel Replace them.
balls.
(1) Damage cords.
(1) Replace.
(2) Bad insulation of electric (2) Replace.
parts.

14

10 Warranty
9-1 Warranty period
It is for one year from purchase.
9-2 Warranty
All NITTOH products and parts, with the exception mentioned below, are warranted
against defects in materials and workmanship, which results in damage to products andparts. This warranty shall cover repair and/or replacement of the products orcomponents/parts free of charge. To qualify for warranty consideration, return the
NITTOH product, freight prepaid, to a NITTOH factory. Refer to the NITTOH
STANDARD EXPRESS WARRANTY for the details.
9-3 Warranty exceptions
No warranty claim will be accepted for damage or breakdown arising for any of thefollowing reasons.
“Abuse or improper use, fair wear and tear, faulty or negligent operation, improper
storage, chemical/ electrical influences or climatic or other effects which can not be
related specially to faults in manufacture”
No liability is accepted for packing seals, springs, and/ or the like, and the following:◎ Alterations or remodeling on the products undertaken by the purchasers without any
prior notice and agreement to NITTOH.
◎ Severe and very highly frequent use, deviating from product specifications.
◎ Damage due to faulty installation or assembly by purchasers or third parties.
◎ Damage from natural disaster.
◎ Damage from such accidents as fire, submersion, dropping, etc.

15