CAT D6RD6H Bulldozer Steering Pump

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

4 year

Product details

CAT D6R/D6H Bulldozer Steering Pump / Work Pump (HPR105) Detailed Analysis

I. Core Parameters & Technical Specifications

1. Basic Parameters

• Pump Model: HPR105 (Linde series hydraulic piston pump, suitable for construction machinery such as bulldozers and concrete pump trucks).

• Operating Flow: Main work pump maximum flow rate ≈ 214 L/min (for D6R); chassis hydraulic pump flow requires configuration-specific calibration.

• Pressure Setting: System relief valve typically rated at 20–35 MPa (refer to equipment manual); HPR105 features a factory-preset pressure relief valve (non-adjustable by non-professionals).

• Fluid Requirements: Recommended use of Cat-specific hydraulic oil (e.g., Cat HYDO Advanced); compatibility must meet ISO 46/68 viscosity grades and pass Vickers 35VQ25A bench test validation for anti-wear performance.

2. Structural Features

• Type: Piston-type hydraulic pump with precision cylinder block, piston assembly, and swashplate design for high-pressure, high-flow output.

• Installation Compatibility: Rear motor plate mounting; requires drive shaft alignment (axial clearance ≤ 0.005 mm); installation mandates lubricant application to reduce metal friction and pre-fill hydraulic oil for air purging.

• Sealing System: Dual-lip shaft seal + O-ring combination to prevent oil leakage and external contaminant intrusion.

II. Installation & Maintenance Guidelines

1. Installation Key Points

• Rotation Direction: Counter-clockwise (CCW) when viewed from the pump rear; incorrect direction risks pump damage.

• Shaft Connection: Drive shaft must insert ≥ 9.5 mm (3/8 inch) into the pump shaft to avoid "bottoming"; torque wrench tightening per specifications.

• Hydraulic Connections: Suction port requires a 10 μm filter; return lines must avoid sharp bends to ensure smooth oil circulation.

2. Routine Maintenance

• Fluid Testing: Regular sampling (e.g., every 500 hours) for viscosity, acidity, moisture, and particle contamination; oil change interval typically 2000 hours or per manual.

• System Purging: Manual rotation of pump shaft pre-startup to evacuate air; monitor via sight glass for bubbles. Address abnormal noise/pressure fluctuations by checking suction line integrity.

• Seal Inspection: Axial seal and O-ring checks every 1000 hours; replace if aged; avoid sharp tools on sealing surfaces.

3. Troubleshooting

• Insufficient Pressure: Check suction filter blockage, internal wear paths, or low relief valve settings; use pressure gauges for diagnostics.

• Abnormal Noise: Causes may include cavitation (insufficient suction), bearing wear, or piston seizure; disassemble and replace damaged components.

• Oil Leakage: Inspect shaft seal, pipe joints, and pump body welds; repair with specialized sealants or replacement seals.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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