10R‑9069 272‑6955 Hydraulic Pump Assembly For Caterpillar E320C E320D

Product Overview

Technical Specifications

• OEM Part Number: 10R‑9069, 272‑6955, 172‑5637(10R‑0552)
• Compatible Machine: Caterpillar E320C / E320D Excavator
• Pump Model: SBS120 Twin Variable Displacement Piston Pump
• Single Pump Displacement: 107 cm³/r
• Total Main Pump Flow: 205 L/min @ 2000 rpm
• Rated Working Pressure: 35 MPa
• Peak Pressure: 37.5 MPa
• Pilot Pump Max Flow: 32.4 L/min
• Pilot Circuit Pressure: 3.9 MPa
• Control Type: Negative Flow Hydraulic Regulator
• Max Input Speed: 2000 rpm
• Gross Weight: 235 KG

Key Technical Advantages

1. Precision‑Machined Housing for Direct Interchange：Mounting flange, spline shaft and port layout strictly follow OEM drawings. Zero modification needed, greatly cuts down excavator downtime during pump replacement.
2. Heavy‑Duty Wear‑Resistant Internal Components：Cylinder block, pistons and valve plate adopt nitrided alloy steel material with ultra‑precision lapping process. Strong impact‑load resistance slows down internal leakage and premature wear under heavy‑duty digging conditions.
3. Optimized Negative‑Flow Control System for Fuel Saving：Matched OEM‑standard regulator delivers load‑sensitive flow output. It effectively resolves slow movements and jitter during combined actions and reduces unnecessary power loss for better fuel efficiency.
4. 100% Full‑Load Bench‑Tested Before Shipment：Every finished pump goes through complete hydraulic simulation testing for pressure, flow and response performance. Defects such as insufficient pressure, internal leakage and abnormal noise are eliminated at factory stage.
5. Low‑Noise Valve‑Plate Design：Optimized silencing groove reduces hydraulic shock during pressure switching, lowers pump vibration and working noise for improved operator comfort.

Application Areas

• Hydraulic power source for Caterpillar 20‑ton crawler excavator E320C, E320D
• Earth‑moving, quarry mining, construction site excavation projects
• Municipal engineering, river dredging and demolition work with hydraulic breaker attachment
• Complete hydraulic overhaul & refurbishment for used second‑hand excavators

Expert Maintenance Tips

1. Thoroughly flush the whole hydraulic circuit and replace all filters before installing the new pump. Never reuse old contaminated hydraulic oil, solid particles will scratch piston and valve‑plate surfaces.
2. Bleed trapped air from the pump cavity during first startup. Run engine at idle speed for 5‑10 minutes and operate all control levers slowly to avoid cavitation damage.
3. Set main relief pressure strictly to OEM 35 MPa specification. Over‑pressurization will drastically shorten pump service life.
4. Replace hydraulic oil and filter elements after the first 200 working hours. Use ISO‑VG46 anti‑wear hydraulic oil and monitor oil cleanliness periodically for long‑term reliability.