Excavator SK70 hydraulic tail pump gear pump PVD15 pilot pump

307002-4472 ZEXEL GEAR PUMP 9217996
307012-8140 ZEXEL 94123Z
307012-3000 ZEXEL
307012-8020 ZEXEL 12+12+7.5 cc/rev
307002-3480 ZEXEL GEAR PUMP 9217990, 74409A, 68761-61170
307001-3420 ZEXEL Hitachi GEAR PUMP 9217979
307002-4671 ZEXEL GEAR PUMP 9218006, 66415 88209, RD30161120
307002-4210 ZEXEL GEAR PUMP Hitachi 9217993
307002-5540 ZEXEL GEAR PUMP 9218012
307012-1311 ZEXEL GEAR PUMP 9226347, 74708H
307012-1090 ZEXEL GEAR PUMP 9218035 Kubota KH60, KH66, KX71
307012-1100, 307012-1021 ZEXEL GEAR PUMP 9218028, 9621810752, 74918H
307012-1091, 307012-1090 ZEXEL GEAR PUMP 9218029 Kubota KH60, KH66, KX71
0510565058, 94126A 68741 61110 94508S
307012-8200 ZEXEL GEAR PUMP 9218043 KUBOTA KH60, KX41
0510365013, 307012-8201, 9218043, 38730, 3070128201, AZPFFF-11-005/005/004RXB202020MB, 222P5/5/4/4XB365013C

SK70 hydraulic pilot pump is an auxiliary power source used to control the main pump or actuator in the hydraulic system. Its working principle and function are as follows:

1. Working principle

SK70 hydraulic pilot pump is usually a small gear pump or vane pump. The core principle is consistent with that of general hydraulic pumps, that is, oil suction and oil pressure are achieved through periodic changes in the sealed volume:

1. When the rotor (gear or vane) in the pump rotates, the volume of the suction chamber increases, forming a vacuum, and low-pressure oil is sucked from the oil tank;

2. The oil is brought into the pressure chamber with the movement of the rotor, and the volume is reduced and discharged under pressure, and low-pressure control oil (usually 3-5MPa, much lower than the working pressure of the main pump) is output.

These low-pressure oils transmit control signals through pilot control valves (such as operating handles and reversing valves) to achieve operational control of the main hydraulic system.

2. Main functions

1. Provide control power: Provide low-pressure hydraulic oil to control components such as main valves (such as reversing valves, flow valves), operating handles, etc., drive these components to move, and indirectly control the flow, pressure of the main pump or the movement direction and speed of the actuator (cylinder, motor).
2. Reduce operating force: The low-pressure oil output by the pilot pump transmits the control signal. The operator only needs to operate the handle with less force to control the high-pressure main hydraulic system and achieve labor-saving operation (such as motion control of excavators and loaders).
3. Improve control accuracy: The pilot oil circuit is independent of the main oil circuit. By adjusting the pilot pressure or flow, the opening of the main valve can be accurately controlled to make the actuator move more smoothly and accurately.
4. Protect the main system: The pilot pump pressure is much lower than the main pump, which can avoid the control components from directly bearing high pressure, extend their service life, and simplify the control structure of the main system.

In short, the SK70 hydraulic pilot pump is the "control center power source" of the hydraulic system, which controls high pressure with low pressure to achieve efficient, labor-saving and precise operation.

FAQ:
1.What do you mainly produce?

A;Our main business hydraulic Spare Parts,safety valve,Gear pump,hydraulic pump,control valve,Trave Motor Assy,swing motor,Seal kit, Electric parts,solenoid valve, engine assembly.etc.

2, Do you have stock for the goods?

A;We have plenty stock for many items in the warehouse.

3. Do you test all your goods before delivery?

A: Yes, we have a 100% test before delivery.

4.I know only the excavator model, but can not offer parts No., what should I do ?

A;If possible, you can send us the old photo, nameplate or the size for reference.

5.can I order one of our samples for testing first?

A: Of course!

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