K3V112S-1NCJ-12T main pump EX100-2 EX100-3 EX120-2 EX120-3
hydraulic pump assy for Hitachi
The hydraulic pump of an excavator is the core component of the
hydraulic system, providing power to the entire system like a
heart. It converts the mechanical energy of the engine into
hydraulic energy, drives the hydraulic cylinder and hydraulic motor
to work, and thus completes various actions of the excavator.
Product Description
Appliion for | Excavator |
Part name | Excavator hydraulic pump assy |
Part number | K3V112S-1NCJ-12T |
Model | EX100-2 EX100-3 EX120-2 EX120-3 |
After sales service | Online , Phone , Video |
Discount | The larger quantity you order, the better price we can supply. |
Warranty | 6 Months |
List of spare parts
| # | Part No | Part Name | Comment | Qty. | Price request |
|---|
| - | 2401-9303 | PUMP (K3V112DTP) | 100 kg | 1 | |
| 79 | 2931100-0056 | REDUCING VALVE | | 1 | |
| 11 | 3853802464 | PISTON ASS'Y | | 2 SET | |
| 151 | 38901-151 | PISTON | | 9 | |
| 152 | 38900-152 | SHOE, TRACK | | 9 | |
| 30 | 2953801990 | SWASH PLATE ASS'Y | | 2 | |
| 212 | 2933800813 | SWASH PLATE/SPHER BUSH | | 1 | |
| 214 | P1R2025125 | BUSH, TILTING | | 1 | |
| 13 | 2953801893 | CYLINDER ASS'Y(R) | | 1 | |
| 141 | 2933800787 | BLOCK, CYLINDER | | 1 | |
| 313 | 3890R-313N | PLATE, VALVE(R.H.) | | 1 | |
| 14 | 2953801894 | CYLINDER ASS'Y(L) | | 1 | |
| 141 | 2933800787 | BLOCK, CYLINDER | | 1 | |
| 314 | 3890L-314N | 2953801893K VALVE PLATE(L) | | 1 | |
| 53 | 2953801989 | TILTING PIN ASSY | | 2 | |
| 531 | 2943800517 | PIN, TILTING | | 1 | |
| 548 | 2953802202 | PIN, FEED BACK | | 1 | |
| 111 | 2933800982 | SHAFT, DRIVING(F) | 3 kg | 1 | |
| 113 | 2933800883 | SHAFT, DRIVING(R) | | 1 | |
| 116 | 2903190-0083 | COUPLING, SPLINE | 1 kg | 1 | |
| 123 | PNUP308K | BEARING, ROLLER | | 2 | |
| 124 | PRNA6906 | BEARING, NEEDLE | | 2 | |
| 127 | 38800-127 | SPACER, BEARING | | 4 | |
| 153 | 2943800463 | PLATE, SET | | 2 | |
| 156 | 2953801765 | BUSH, SPHERICAL | | 2 | |
| 157 | 2953801769 | SPRING, CYLINDER | | 18 | |
| 158 | 2953801764 | SPACER | | 2 | |
| 211 | 68710-00-211 | PLATE, SHOE | | 2 | |
| 251 | 2923800809 | SUPPORT-S | 10 kg | 2 | |
| 261 | 2943800572 | COVER, SEAL(F) | | 1 | |
| 263 | 2943800465 | COVER, SEAL(R) | | 1 | |
| 271 | 2923800807 | CASING, PUMP | | 2 | |
| 312 | 2923370-0044 | BLOCK, VALVE | | 1 | |
| 401 | 2953801767 | BOLT, HEX SOCKET HEAD | | 8 | |
| 406 | OSBM820 | SCREW, HEX. S.H.C M8X20 | | 8 | |
| 466 | OVP14 | PLUG, VP | | 2 | |
| 468 | OVP34 | 108847 VP-PLUG | | 4 | |
| 490 | PBP116-2403 | PLUG | | 27 | |
| 532 | 2943800462 | PISTON, SERVO | | 2 | |
| 534 | 2953801761 | STOPPER(L) | | 2 | |
| 543 | 2953802678 | STOPPER 1, M/PUMP | 4 kg | 2 | |
| 535 | 2953801762 | STOPPER(S) | | 2 | |
| 541 | 2953802677 | SEAT, M/PUMP | | 4 | |
| 544 | 2933260-0074 | STOPPER 2 | | 2 | |
| 545 | ODW732 | BALL, STEEL | 1 kg | 4 | |
| 702 | OORBG35 | O-RING(G35) | | 2 | |
| 710 | OORBG95 | O-RING | | 3 | |
| 717 | OORBG145 | O-RING | | 4 | |
| 724 | OORBP8 | O-RING(P8) | | 16 | |
| 725 | OORBP11 | O-RING(P7) | | 6 | |
| 728 | OORBP24 | O-RING(P24) | | 4 | |
| 732 | OORBP18 | O-RING(P18) | | 2 | |
| 774 | PTCV45V | SEAL, OIL | | 1 | |
| 789 | OT2BP18 | RING, BACK UP | | 2 | |
| 792 | OT2BG35 | RING, BACK UP | | 2 | |
| 806 | ORNM16 | NUT M16 | | 2 | |
| 808 | ORNM20 | NUT M20 JIS B1181 RN-M20 | | 2 | |
| 824 | OSR40 | RING, SNAP | | 2 | |
| 885 | PJR812 | PIN | | 2 | |
| 886 | OSPV614 | SPRING PIN | 2 kg | 4 | |
| 901 | OEBM10 | BOLT, EYE | | 2 | |
| 953 | PSSSM1630 | SCREW , SET | | 2 | |
| 954 | 2953801768 | SCREW, SET | | 2 | |
| 981 | PNPA-2550A | PLATE, NAME | | 1 | |
| 983 | OSK2548 | RIVET | | 2 | |
| * | 401-00059KT | SEAL KIT, BODY+REG.+PTO | | 2 SET | |
Two types
Gear pump: With a simple structure, low cost, and strong anti
pollution ability, but with large flow pulsation and high noise, it
is mostly used in small excavators or auxiliary systems.
Piston pump: with complex structure and high cost, but high working
pressure, large flow rate, high efficiency, and high control
accuracy, it is widely used in medium and large excavators.
Working principle
Oil suction process: The plunger moves backwards, the pump chamber
volume increases, forming a vacuum, and the hydraulic oil in the
oil tank enters the pump chamber under atmospheric pressure.
Oil pressure process: The plunger moves forward, the pump chamber
volume decreases, the hydraulic oil is compressed, the pressure
increases, the oil outlet valve is pushed open, and high-pressure
oil enters the hydraulic system.
performance parameter
Displacement: The volume of oil discharged by the pump shaft per
revolution determines the working speed and force of the excavator.
Pressure: The pressure of the oil at the pump outlet determines the
working capacity of the excavator.
Rotational speed: The rotational speed of the pump shaft affects
the flow rate and lifespan of the pump.
Efficiency: The ratio of output power to input power of a pump,
reflecting energy loss.
Maintenance
Regularly replace hydraulic oil and filter element to keep the oil
clean.
Regularly check the noise, vibration, and temperature of the
hydraulic pump, and promptly address any abnormalities found.
Avoid long-term overload work to prevent hydraulic pump overheating
and damage.
development trend
High pressure and high flow rate: Improve the work efficiency and
operational capacity of excavators.
Intelligence: Adopting electronic control technology to achieve
precise control and energy management of hydraulic pumps.
Energy saving and environmental protection: Develop hydraulic pumps
with low noise, low energy consumption, and low emissions.
Two types
Gear pump: With a simple structure, low cost, and strong anti
pollution ability, but with large flow pulsation and high noise, it
is mostly used in small excavators or auxiliary systems.
Piston pump: with complex structure and high cost, but high working
pressure, large flow rate, high efficiency, and high control
accuracy, it is widely used in medium and large excavators.
working principle
The working principle of hydraulic pumps is based on changes in
volume. Taking plunger pump as an example:
Oil suction process: The plunger moves backwards, the pump chamber
volume increases, forming a vacuum, and the hydraulic oil in the
oil tank enters the pump chamber under atmospheric pressure.
Oil pressure process: The plunger moves forward, the pump chamber
volume decreases, the hydraulic oil is compressed, the pressure
increases, the oil outlet valve is pushed open, and high-pressure
oil enters the hydraulic system.
FAQ
Q: How to guarantee the same?
A: Before sending, We will take pictures and size, Find problems
and replace them free of charge.
Q: When to ship?
A: Once getting payment then arrange.
Q: Import customs fee?
A: It depends on import country. We can make lower valve so that
you can pay lower customs fee even no need to pay.
Q: How long for transport?
A: For express/ air, it takes about 5 days. For land/ sea, it takes
about half one month/ one month. It depeds on your address.
Q: Product usage?
A; If any problem about usage, Our engineers will solve at first
time.
