CAT 320GC hydraulic pump spare parts
3 week ago
Product details
CAT 320GC Hydraulic Pump Spare Parts Full Introduction
(Incorporated keywords: Hydraulic valve, hydraulic system)
This batch of precision components are core overhaul spares for the main Hydraulic piston pump on CAT 320GC excavator. They work cooperatively to deliver hydraulic power and maintain stable operation of the whole machine’s hydraulic system. Matched with supporting Hydraulic valve assemblies like proportional valves and distribution valves, these parts form a complete hydraulic power loop to realize digging, traveling and slewing actions of the excavator.
Full Part List & Individual Detailed Description
1. Regulator
- Definition: Power regulator / LS load-sensing regulator
- Function: The intelligent control core of the hydraulic pump. It collects load pressure signals from the hydraulic system, automatically adjusts the tilt angle of the swash plate to change pump displacement, controls oil output flow in coordination with main Hydraulic valve actions, prevents engine stalling under heavy load and optimizes fuel efficiency. Common faults: stuck valve spool, internal damping blockage leading to weak machine action.
2. Shoe Plate (Piston Shoe Retainer / Retainer Plate)
- Definition: Plunger shoe retainer plate
- Function: Fixes all piston shoes in a circular arrangement, keeps piston shoes tightly fitted on the swash plate during high-speed rotation. It bears cyclic friction and impact force, ensuring synchronous linkage between pistons and the swash plate. Severe wear will cause oil leakage inside the pump and drop the overall efficiency of the hydraulic system.
3. Swash Plate
- Definition: Also named rocker cam / wobbler
- Function: The key power conversion component. Changing its inclined angle alters the reciprocating stroke of pistons to adjust the pump’s oil delivery volume. Its smooth friction surface mates with piston shoes; scratches or abrasion will aggravate shoe wear and trigger abnormal noise in the hydraulic system.
4. Cylinder Block (Barrel)
- Definition: Pump cylinder barrel
- Function: Equipped with multiple cylindrical bores to house pistons, rotating synchronously with the main drive shaft. It closely contacts the valve plate for oil suction and discharge distribution. Internal bore scoring or end-face wear leads to heavy internal leakage of the hydraulic pump, failing to build pressure for the hydraulic system.
5. Pistons (Piston Assembly with Shoes)
- Definition: Plunger & piston shoe integrated assembly
- Function: The pressure generating unit. Driven by the swash plate, pistons reciprocate inside the cylinder block to squeeze hydraulic oil and produce high pressure for the whole hydraulic system. Chrome layer peeling or shoe copper surface burning are typical failure causes of insufficient digging force.
6. Valve Plate
- Definition: Port plate / distribution plate
- Function: Static oil distribution sealing part. Its dual arc oil grooves separate high-pressure oil outlet and low-pressure oil inlet. It forms a high-precision friction pair with the end face of the cylinder block. Surface ablation or groove deformation causes cross-flow of high and low pressure oil inside the pump, breaking the pressure balance of the hydraulic system.
7. Small Springs
- Definition: Return springs & positioning small springs (including piston return springs, valve plate preload springs, regulator inner small springs)
- Function: Provides pre-tightening force to reset pistons, press the valve plate against the cylinder block and reset internal spools of the regulator. Fatigue fracture or elastic attenuation causes parts failure to reset normally, resulting in delayed response of the hydraulic pump and disordered coordination with Hydraulic valve actions.
Application & Overhaul Scenario
These spare parts are applied for complete overhaul of CAT 320GC original main hydraulic pump. Replacement is required when the machine suffers insufficient power, slow compound actions, pump metallic knocking noise, high oil temperature and sharp pressure fluctuation of the hydraulic system, caused by long-hour operation, contaminated hydraulic oil and overdue maintenance. After full replacement, the hydraulic pump can restore factory performance and perfectly match the supporting Hydraulic valve group to stabilize the entire hydraulic system.
Core Features
1. Strictly sized to CAT original OEM standards, seamless assembly without reaming or modification.
2. Adopts high-strength alloy steel, carburizing quenching and precision grinding craft, resisting high pressure, friction and fatigue in harsh construction environments.
3. Complete set matching design, avoids single-piece replacement causing secondary abrasion of mating parts, extends service life of the whole hydraulic system.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
4 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump ,
hydraulic valve ,
hydraulic winch,
hydraulic system