CAT320GC Hydraulic Pump Assembly, Part Number: 531-9885/489-3484

CAT320GC Hydraulic Pump Assembly, Part Number: 531-9885/489-3484
Basic Information
- Product Name: CAT320GC Main Hydraulic Pump Assembly (Electronically Controlled Plunger Pump)
- Part Numbers: 531-9885 (Assembly) / 489-3484 (Flange/Disk)
- Compatible Models: CAT 320GC / 323GC Excavators (C4.4 Engine)
- Model:  B o sch Rexroth A28VO130 Swashplate Axial Plunger Twin Pump
- Control Method: Electronically Controlled Positive Displacement, No Independent Pilot Pump
Core Parameters
- Total Displacement: 130 mL/r × 2 Twin Pumps
- Maximum Flow: 429 L/min (Main System)
- Working Pressure: 35 MPa (350 bar)
- Drive Method: Directly Driven by Engine, Connected via 489-3484 Flange
- Weight/Material: Approximately 120 kg, High-Strength Cast Iron Housing + Alloy Plunger Components
- Features: Eliminated Pilot Pump, Electronically Controlled Variable, Energy-Saving and Efficient
Product Advantages
1. Original Genuine Parts, Precise Fit
Original CAT A28VO130 assembly with part number 531-9885 perfectly matches the 320GC/323GC; 489-3484 flange directly connects to C4.4 engine without modification.
2. Electronically Controlled Positive Displacement, Fuel-Efficient and Efficient
B o sch Rexroth technology electronically controlled twin pump adjusts flow intelligently according to load; elimination of pilot pump reduces hydraulic system energy consumption by approximately 20%, significantly improving fuel economy.
3. High Pressure and Durable, Strong Impact Resistance
Designed for 35 MPa high pressure, suitable for heavy-duty operations; high-quality alloy plungers and high-strength housing offer wear resistance, impact resistance, and aging resistance, extending service life.
4. Low Maintenance, Cost Reduction and Efficiency Improvement
No pilot pump or pilot filter, reducing maintenance items; extended hydraulic oil replacement cycle lowers comprehensive maintenance costs by approximately 20%.
Installation and Compatibility Notes
- 489-3484 is the engine connection flange; verify engine model (C4.4) and flange dimensions.
- Clean oil lines before installation, replace hydraulic oil filter to prevent impurities from wearing plungers.
- Protect electronic control connectors against water to prevent short circuit faults.