CAT320D Main Hydraulic Pump for Caterpillar 20‑ton medium excavator spare parts

Short Description:

The CAT330B multi‑way control valve is an original heavy‑duty integrated main control valve for Caterpillar 30‑ton large excavator hydraulic systems. Precisely calibrated to match the hydraulic pump output power and heavy‑load response logic of CAT330B excavator, it acts as the core hydraulic distribution hub of the whole machine. It distributes hydraulic oil flow for boom, arm, bucket, travel and swing actuators, realizing compound‑action coordination, high‑flow stable distribution and system overload pressure protection. Optimized for quarry mining, rock excavation, large‑scale earthwork, foundation engineering and continuous heavy‑load working conditions, it features large flow capacity, robust spool response, low internal pressure loss, reliable compound‑action performance and strong anti‑pollution capability, ensuring stable and high‑output operation of CAT330B excavator under severe heavy‑duty construction environments.

Product Detail

Product Tags

description

The CAT320D main hydraulic pump adopts dual‑piston variable displacement structure, equipped with precision swash plate assembly, pressure regulating valve, flow control valve and servo control components. With original power‑matching calibration technology, it dynamically adjusts pump displacement according to load changes, realizing good power matching between pump and engine. The pump housing is made of high‑strength cast‑aluminum alloy, internal plunger, valve plate and slipper pairs adopt high‑precision grinding and surface hardening treatment, reducing friction loss and improving wear resistance. All finished pumps pass strict factory pressure test, flow detection and load simulation test. Compared with ordinary non‑calibrated replacement pumps, genuine CAT320D hydraulic pump achieves higher power‑matching accuracy, lower heat generation and more stable output, effectively solving typical faults such as insufficient digging force, slow movement, system over‑heating and abnormal noise caused by mismatched parameters.

product parameters

Brand: OEM Genuine
Model: CAT320D
Product Name: Main Hydraulic Pump Assembly
Applicable Equipment: Caterpillar 20‑ton medium excavator (CAT320D)
Structural Type: Dual‑variable piston pump, power‑regulating hydraulic control
Core Structure: Pump housing, swash plate assembly, plunger‑slipper group, valve plate, pressure regulator, flow control valve, servo piston, oil suction & discharge ports
Main Material: High‑strength cast‑aluminum housing, wear‑resistant alloy plunger, hardened valve plate, high‑pressure aging‑resistant sealing parts, hydraulic control components
Core Function: Convert mechanical power into high‑pressure hydraulic energy, adjust displacement dynamically, provide power for each actuator of excavator
Working Characteristics: Dynamic power matching, stable pressure output, low noise, low internal leakage, good anti‑fatigue and anti‑pollution performance
Working Condition Adaptation: Suitable for earthwork excavation, foundation construction, road reconstruction, material loading, frequent compound‑action and high‑vibration open‑air environment
Matching Parts: Multi‑way control valve, hydraulic cylinder, travel & swing motor, pilot valve, high‑pressure pipeline, hydraulic oil tank and filter elements

advantages

• Adopts original CAT320D dedicated power calibration, realizing excellent engine‑pump matching and reducing engine stall risk under heavy load.
• Advanced variable‑displacement adjustment structure, dynamically outputs flow according to load demand, improving working efficiency and lowering fuel consumption.
• High‑hardness plunger‑valve‑plate friction pairs reduce internal wear, effectively lowering risks of large internal leakage and pressure insufficiency.
• Optimized internal flow channel design suppresses heat accumulation, improves heat dissipation performance and relieves system over‑heating trouble.
• Reliable pressure‑regulating and servo‑control components keep stable pressure output under frequent load fluctuation.
• High‑quality pressure‑resistant sealing components resist high‑temperature hydraulic‑oil corrosion and prevent pump body oil leakage.
• Standard original installation dimensions support on‑site non‑destructive direct replacement without modification, shortening equipment maintenance downtime greatly.

maintenance & replacement tips

• Regularly inspect pump housing, oil port joints and connecting pipelines to eliminate oil leakage risks caused by long‑term vibration and impact load.
• Replace hydraulic oil and filter elements strictly according to host maintenance cycle to prevent particle impurities from scratching plunger and valve‑plate friction pairs.
• Use qualified clean hydraulic oil to avoid abnormal wear, control valve stuck and pump malfunction caused by oil deterioration and contamination.
• Regularly detect system pressure and pump output flow to ensure the main hydraulic pump works within standard operating range.
• Avoid long‑term over‑pressure overload operation to prevent premature fatigue damage of internal pump components.
• When faults such as insufficient digging force, slow movement, serious internal leakage, abnormal noise and high system temperature appear, replace genuine CAT320D main hydraulic pump timely to restore full hydraulic performance of excavator.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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