ELECTRIC/HYDRAULIC PUMPS

UP-35DX-IN(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
2
3
4
5
6
7
8
9
10
11

Safety information-----------------------Description of components------------Instructions before use-----------------Operation----------------------------------Maintenance------------------------------How to remove the cover--------------Circuits-------------------------------------Construction drawings------------------Parts lists----------------------------------Trouble shooting guide-----------------Warranty-----------------------------------1

2
4
4
5
5
9
10
11
12
13
14

page

1 Safety Information
Three types of symbols are used in this instruction manual to ensure correct use of the
product and to prevent harm to you or others or damage to property. The symbols and their
meanings are as follows. Please read the text after understanding the contents carefully.
NITTOH ZOHKI is not responsible for any damage or injury resulting from unsafe use of the
product, lack of maintenance, or improper application of the system.
Cautions remarks used in this manual are classified as follows;⚠

DANGER⚠

WARNING⚠

CAUTION

If this symbol is ignored and the product is handled improperly,
there is a high probability that the user will be killed or seriously
injured.
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury to the user.

Indicates a potentially hazardous situation which, if not avoided,
could result in injury to the user or property damage.

Cautions when installed⚠

WARNING■Install the unit stably.
Since this pump uses a sealed tank, it can be used in all directions (diagonal, upside down,
vertical, horizontal), but please do not place it on an unstable surface. However, do not place
it on an unstable surface, as it may fall and cause injury. When installing the product at anangle, make sure to fix it firmly.
■Prepare the work environment.
Remove any objects (high temperature, fire, movable objects, sharp objects, corrosive
objects, etc.) around the work area where the pump is used that may cause injury or harmto the user.

⚠

CAUTION■Avoid rain and moisture, and use the product in a place with as little dust as possible.
■Avoid direct sunlight in summer. The temperature of the hydraulic fluid may rise, causing
problems with processing and equipment.
■For outdoor use in extremely cold weather, replace with hydraulic fluid of the proper
viscosity. The viscosity of hydraulic fluid increases as the temperature of the fluid drops,
which may cause problems with processing and equipment.

2Precautions for use⚠

WARNING■Take safety measures.
Use protective equipment, work clothes, safety glasses, etc. to protect yourself when
operating hydraulic equipment.
■Pay attention to the allowable pressure of the hydraulic circuit.
Always work to ensure that the maximum permissible working pressure of the pump is
less than the permissible pressure of other hydraulic equipment connected to it and lessthan the permissible load.
■Be careful of electric shock.
Do not pull out the power plug with wet hands. Always use the grounding clip on the powerplug to ground the unit when in use. Do not use this product near an electric welding
machine or on grounded materials or equipment.

⚠

CAUTION■The power supply is AC200-230V 50/60Hz single phase.
Use of the wrong voltage may cause burnout or heat generation.
Use of the product at a low voltage may result in burning or overheating. Be careful ofvoltage drops, especially when using a generator.
■When unplugging the power plug from the outlet, be sure to grab the power plug and pull
it out. Pulling the cord and unplugging it from the outlet may cause disconnection or shortcircuit.
■When using auxiliary cords, please use 1.25 ㎟ or more thick cords so that the voltage will
not drop, and the length should be within 10m.

Specifications
Model,No
UP-35DX-IN (L)

Electric motor
Commutatorand open type,0.35KW
200-230V
50/60Hz
single phase,“E” insulation,
2000rpm

Hydraulic pumpMax,
Flow Rate
Work pressure
MPa
L/min(50Hz)
1st stage

2nd
stage

1st stage

2nd
stage

1

70

2.5

0.3

3

Reservoir

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

1L
10.5Kg2L(12Kg)

2 Description of components
1

Pump body2

Back Cover3

Tank Cover

4

Pump Feet

5

Relief Valve

6

Air Relief Valve

7

Storage Box

8

Oil Feeding Plug

9Discharge Port

10Power Cord

11

Operation Cord

12

Fuse

3 Instructions before use
3-1

Please make sure that there is no damage or oil leakage during transportation.

3-2⚠

CAUTION

Oil feeding plug

The tank (using a rubber tank) is a sealed type, so please use a sealed fueling plug. Also, besure to use a coupler with a check valve.
3-3⚠

WARNING

Check the power supply

The power supply is AC200-230V (50/60Hz) single phase. Be sure to ground the unit whenusing it.
3-4⚠

WARNING

Check the hydraulic oil

To check the oil level, use the following method.
Always check the amount of oil in the pump with the cylinder of the connected equipment
fully returned before operation, and always use the correct amount. If oil is supplied when
the cylinder lot of the connected equipment is out, there will be no place for the oil in thecylinder to return, and the oil will overflow, or high pressure will be generated in the tank,which is dangerous.
(1) Turn the cylinders of the connected devices back on completely.
(2) Unplug the power supply.
(3) Stand the pump upright with the oil tank sidedown.
(4) Turn the oil feeding plug with a flat-blade
screwdriver in the semi-clockwise direction to removeit.
(5) Check the amount of oil from the removed oil
supply port.

4(6) If the oil fills up to the step in the oil supply cap, it is normal. (For the type of hydraulicfluid to be used, refer to the section 5-1) Hydraulic fluid.)(7) Turn the oil supply plug clockwise to tighten it. Be careful not to damage the O-ring.

4 Operation“UP-35DX-IN(L)” with 2-way normally closed solenoid valve, pressure holding andinching type.
1. When you press the ON button on the two-point control switch, the motor turns andoil is sent through the hose to the cylinder. When you release the switch button, themotor stops, the oil stops flowing, and the cylinder stops.
2. When you press the OFF button on the two-point control switch, the solenoid valve isactivated and the oil in the cylinder returns to the tank. （The cylinder returns only
when the OFF control switch is pressed, and stops returning when the switch isreleased. (An intermediate stop of return is possible.)

5

Maintenance

5-1 Hydraulic oil① Type of oil
As a general rule, use genuine oil NHO-32 (1 liter ). For urgent use, use high quality
hydraulic oil (equivalent to ISO standard #32 viscosity : 32 cSt @40℃).
② Oil temperature
The proper operating temperature for hydraulic fluid is 55℃ or less. Stop working until
the temperature drops to the proper level.
③ Oil change⚠

CAUTION
Since hydraulic fluid deteriorates, replace the entire amount periodically. The oil should
be replaced after 300 hours of operation or 3 months. To replace the oil, remove the oil
plug, turn the pump at an angle to remove the oil, and fill the pump to the top of the oil
plug, taking care not to let any impurities such as dust enter. The following are thethree points to keep in mind when replacing.
*Make sure that the cylinder is completely back in place.
*Never add different kinds of oil, even if it is only a small amount.
*When refilling the oil, be careful not to mix in any foreign matter.

④ Other⚠

WARNING
If oil gets into your eyes, rinse thoroughly with clean water. Rinse thoroughly withclean water and seek medical attention immediately. If oil gets into wounds or otherskin areas, rinse with soapy water, stop bleeding, and seek medical attention
immediately.
55-2 Pressure and piping① Composition of hydraulic equipment system⚠

WARNING

When combining pumps, high-pressure hoses, cylinders, couplers, valves, etc. to form ahydraulic system, make sure that the maximum working pressure of each device is the same.
If a pump with a lower maximum working pressure is used, the maximum working pressureof the system should be adjusted to the lowest one.
② Pressure gauges
Install a pressure gauge to check the pressure at all times, or make it readily available.

③ Piping⚠

CAUTION

Wrap sealing tape around the tapered pipe screw when connecting it to the hose piping or
to various valves and couplers. Refer to the taper screw tightening torque table below andbe careful not to over-tighten.
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)

Do not allow any scraps of sealing tape to enter the hydraulic equipment. Failure to do so
may result in damage.
5-3 High pressure hoses① Hose installation⚠

WARNING

The high pressure hose will expand and contract slightly when pressurized, so allow
some room for expansion. Also, be careful not to rub against other hard objects.
Do not clamp the high pressure hose. The high pressure hose will stiffen and move tostraighten when pressure is applied. Clamping the hose, especially at the bent part,may cause damage due to excessive force during pressurization. If the high-pressure
hose is not handled properly, its life will be extremely short. In particular, it issusceptible to fire (high temperature), extreme bending, and twisting, so do not use it inhigh temperature environments, below the minimum bending radius, or while twisted.
② Hose handling⚠

DANGER

Never drop objects into the high pressure hose. The impact of falling objects may cause
the high pressure hose to burst, resulting in a serious accident.
Do not pull the high pressure hose with strong force. Dragging or carrying the pump,cylinder, etc. with the high pressure hose may cause damage to the high pressure hose,resulting in a serious accident.

65-4 Coupler① Connection
Before connecting the coupler, make sure that there is no dust, sand, etc. attached tothe connection part of the coupler. After connecting, pull the high-pressure hose toconfirm the connection.
② Handling⚠

WARNING

Do not pressurize the product with the coupler attached to the end of thehigh-pressure hose without installing the cylinder. If the coupler is damaged, aserious accident may result. If it is necessary to remove the coupler to check theoperation and pressurize, avoid working in a direction where the coupler may pop out.
Do not connect or disconnect the coupler while it is pressurized.
5-5 Air inclusion⚠

CAUTION

The UP-35DX series has a sealed structure with a rubber tank inside the tank cover.
When the tank is full of oil, there is no air ingress, but when a hose, cylinder, or otherpressure equipment is connected, the air in the hose, cylinder, or other equipment may
enter the pump. If air is mixed in the pump, the pressure will not rise, oil will not bedischarged, and other problems will occur. In this case, follow the procedure below to
restore the pump.
① Is the oil filled to the fullest level ?
Turn the pump upright (tank cover side down), open the oil supply valve, check theamount of oil, and refill the tank to the full level. (For precautions, refer to "5-1) Replacing
the hydraulic fluid (3)".
② If the pump does not discharge or the pressure does not rise even after refilling with oil,press the operation switch and the return switch about 10 to 11 times repeatedly with thepump in the upright position.
③ If the discharge or pressure still does not increase, loosen the air release valve (No. 5 onpage 3) at the bottom of the pump by about two turns, and press the operation switch andthe return switch repeatedly about 10 to 11 times. After that, tighten the air release valve
and operate the pump for confirmation.
④ When the pump operates normally, be sure to refill the tank with oil to the full capacity.
This is because air in the hoses, cylinders, and other hydraulic equipment is in the tank of
the pump.
◎ How does air accumulate in the pump (rubber tank) when hydraulic equipment isconnected together? Always make sure that the oil tank is full before use.

7

5-6 Carbon brushes① Cautions for use⚠

WARNING

Always pay attention to the wear of the carbon brushes. When the carbon brush is worn
down to 6mm or when the motor has been running for more than 150 hours, replace it with a
new one. If worn brushes are used as they are, rectifying sparks will increase and cause
failure. The material of the carbon brush has a great influence on the performance and life of
the motor, so be sure to use a genuine carbon brush when replacing it.

① How to changeFirst, turn off the power; remove the two rubber caps, then loosen and remove the mounting
screws inside with a screwdriver to remove the carbon brush. Replace the brush with a newone and fix the screws and rubber cap.
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.

Loosen the relief valve lock nut(hexagon 2.5mm) and turn the adjust
screw (hexagon 6mm) to adjust thepressure to the set value. Turning
the adjustment screw to the right
will increase the pressure, andturning it to the left will decrease thepressure.
However, the standard product canbe adjusted in the pressure range of
58.8 to 68.6 Mpa (600 to 700 kg/cm2).
If you want to use it at a pressure
lower than that, you will need toreplace the spring, so please contact
us.
Check the operation and tighten thelock bolt. The pressure may change when the lock bolt is tightened, so please check theset pressure again.

8

5-7 How to remove the cover

①
②
③
④
⑤
⑥

Fitting bolt M5×10 Hexagon socket
head screw
Tank Cover⑦

Rubber sheet⑧

Fitting bolt M5×10 Hexagon socket
head screw
Back Cover
Fitting bolt M5×15 Hexagon socket
head screw
Pump Feet⑨

Fitting bolt M5×10 Hexagon socket
head screw
Side cover 1⑩⑪

Side Cover 2
Pump body

Disassembly procedure of the cover
The cover cannot be removed if the hose etc. are connected to the outlet.
1. Remove the 4 fitting bolts ① and ③, and then remove ② tank cover , and ④ backcover.
2. Lay the pump down so that ⑨ the side cover 1 is on top.
3. Remove ⑤ the fitting bolts, and remove ⑥ the two pump feet. ⑦ Rubber sheet
is glued.
4. Remove ⑧ the 3 mounting bolts.
5. Lift up and remove ⑨ the side cover 1.
6. Lift up and remove ⑪ the pump body.
Note that there are some wires connected to the pump.
For installation, reverse the above procedure, paying attention to the pump alignment
and wiring.
96 Circuits
Hydraulic Circuit

Electrical diagram

How to change the carbon brush

1. Remove the back cover.

4. Use the screw threads to
set it so that it is stuck inthe back.

2. Remove the carbon
brush mounting screw
with a screwdriver.

3.Pull out the carbon
brush and insert a newcarbon brush.

5. Screw in the carbon brush mounting screw. If there is any
uncomfortable feeling when screwing in, do not screw it in but
remove it again. There is a possibility that the metal part of the
carbon brush will be deformed.

Relief valve & Air relief valve
Air Relief Valve

Lock screw
Relief Valve10

7 Construction drawings

11

8 Parts list
No.
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
1-12
1-13
1-14
1-15
1-16
1-17
1-18
1-19
1-20
1-21
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
2-29
2-30

Part No.
Description
Driving section
Base plateAC0598A00 Oil seal
TLA1512Z Bearing
Eccentric collar
RNAF273013
Bearing
Spring Pin
φ4×28
NTB1528
Thrust bearing
AS1528Thrust Washer
Shaft
Second gearKey
G-15
G ring
AS1528Motor
M6×20CAP
Fitting bolt 1
PCB M6×15 Fitting bolt 2
M6
Washer
PT1/16
Plug
Steel ball
φ6
Hollow set
M8×6
MB700-050
ExpanderMB700-040
ExpanderPump section
High pressure piston
Piston spring
Low pressure piston
Piston spring
Cupper packing
High pressure plug
Pushing screw

2-31
2-32
2-33
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
3-20
3-21
3-22
3-23
3-24
3-25
3-26
3-27
3-28
3-29
3-30
3-31
3-32
3-33
3-34
3-35
3-36
3-37
3-38
3-39

High pressure suction spring

φ5

Steel ball
Valve sheet
Pushing valve sheet
Pushing screw
Valve sheet
Steel ball

WF5-10High pressure check spring

P-7
P-7 bias

Check retainer
O ringBack up ring

φ6

MSW12

Low pressure suction holder

WF5-10

Low pressure suction spring

φ5

Steel ball
Valve sheet
Cupper packing
Suction retainer
Pushing screw
Pushing screw

MSW12-6
MSWA20
WF5-10
φ5

4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10

Low pressure check spring

Steel ball
Cupper packing
Retainer F
12

MSWAS12-6

Pushing screw
Low pressure suction filter
High pressure suction filter

Returning section
NW-22B
Solenoid
Base block
Fitting bolt
M5×45
M5Spring washer
Push pin
φ3×8
Spring pin
Lever
MS3-25Straight Pin
Lever support
M4×10 CAP Fitting bolt
M4
Spring washer
PoppetSleeveP-8
O ringP-8 bias
Back up ring
P-5
O ringP-5 bias
Back up ring
WH8-20SpringValve sheet
P-9
O ringP-9 bias
Back up ring
Valve sheet pushing screw

M4

WasherHexagon nut
M4
Tooth lock washer
Push pin holder
φ3×15.8
Push pin
Push pin spacer
P-3
O ringP-3 endless Back up ring
Stopper pin
WB6-10Spring
MB700-040
ExpanderP-5
O ringM5×30
Fitting bolt
M5
Spring washer
Relief valve section
Cupper packing
Valve sheet
High pressure relief
S-12
O ring
φ2.5
Steel ball
Relief ball receiverHigh pressure spring
Spring pushing
P-6
O ring
MSWA12
Pushing screw
M4.5×P0.75

4-11
4-12
4-13
4-14
5-1
5-2
5-3
5-4

Lock screw
Steel ballBall pushing
P-4
O ringTank section
Rubber tank 1L
Fixed tank ring
Fitting bolt
M6×20
M6
Spring washer

5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13

M3×6
φ6

P-16
TSC-14
O-14
M6×10
M4×10

Oil feeding plug
O ringDischarge nipple
Coin filter
Snap ring
Pump stay tank side
Fitting bolt
Pump stay motor side
Firring bolt

9 Trouble shooting guide⚠

WARNINGTo avoid injury, repairs and troubleshooting should be performedby qualified personnel familiar with this type of equipment. Use appropriate gauges andequipment.
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 part.

(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) Damage of pump body.
(5) Repair pump.
(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.
13

10 Warranty
10-1) Warranty period
For general defects and failures, 365 days from the last day of the month of
manufacture.
Example: If the pump was purchased on January 1, 2019, the warranty period will be
until January 31, 2020.
10-2) Warranty conditions
NITTOH products and components are warranted against damage to products andcomponents due to defects in materials and workmanship, with the following exceptions
This warranty provides for the repair and replacement of the product or component
parts at no charge. In the event of a malfunction within the warranty period, pleasepresent this warranty card and contact your dealer or nearest Nittoh sales office.

10-3 Exceptions to the Warranty
Warranty claims will not be accepted for damage or malfunction caused by the following
reasons
Misuse or improper use, fair wear and tear, incorrect or careless operation, improper
storage, chemical or electrical effects, climatic or other effects that cannot be
specifically linked to manufacturing defects
We are not responsible for packing, springs, etc. and the following items.
Modification or processing of the product carried out by the purchaser without priornotice or consent to us.
Harsh and very frequent use of the product deviating from its specifications.
Damage caused by incorrect installation or assembly by the purchaser or a third party.
Failure due to natural disasters.
Damage caused by fire, submersion, dropping, or other accidents.

14