A4VG175 Hydraulic Piston Pump Parts
3 week ago
Product details
I. Overview of A4VG175 Hydraulic Piston Pump
TheA4VG175is aswashplate-type variable-displacement piston pumpmanufactured byRexroth (Bosch Rexroth), widely used in construction machinery (e.g., excavators, road rollers), industrial hydraulic systems, and marine applications.
• Displacement Range: 175 cm³/rev (variable design for adaptable performance).
• Rated Pressure: 350 bar (peak pressure up to 400 bar).
• Control Modes: Hydraulic, electric, or manual proportional control options.
• Structural Features: Swashplate design with fixed-angle pistons, suitable for high-pressure, large-flow applications.
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II. Core Components and Functions
1. Drive and Structural Parts
• Cylinder Block
• Material: High-strength alloy steel (e.g., 42CrMo4).
• Function: Supports piston movement and forms a sealed chamber with the port plate.
• Common Failures: Wear-induced leakage; requires flatness and surface hardness checks (HRC ≥ 55).
• Port Plate (Valve Plate)
• Material: Copper alloy (e.g., ZQSn6-6-3) or composite material.
• Function: Distributes high-pressure and return oil, ensuring pressure isolation.
• Key Parameters: Kidney slot angle, surface roughness (Ra ≤ 0.4μm).
• Swash Plate
• Material: Ductile iron (QT500-7) or forged steel.
• Function: Converts rotational motion into reciprocating piston motion; adjusts displacement.
• Inspection Items: Swashplate angle accuracy (±0.5°), surface hardness (HRC ≥ 45).
2. Piston and Sealing Components
• Piston & Slipper Assembly
• Piston Material: Nitrided steel (e.g., 18CrNiWA).
• Slipper Material: Copper-based alloy (coating thickness ≥ 0.02mm).
• Function: Transmits motion between pistons and swashplate while reducing friction.
• Failure Modes: Slipper burnishing, piston scuffing.
• Seals
• Types: Shaft seals (U-cup/V-ring), dust wipers, O-rings.
• Material: Fluororubber (FKM, resistant up to 200°C) or polyurethane (PU).
• Key Parameters: Compression rate (15%-25%), hardness (Shore A 90±5).
3. Control and Adjustment Parts
• Variable Displacement Piston
• Function: Adjusts swashplate angle via hydraulic/mechanical signals to modify displacement.
• Inspection Items: Seal integrity, stroke tolerance (±0.1mm).
• Control Valve Block
• Components: Pressure compensator, displacement control valve, proportional solenoid valve (if applicable).
• Material: Stainless steel (304/316) or hard-anodized aluminum.
• Common Issues: Valve spool sticking, spring failure.
4. Bearings and Bushings
• Main Bearing
• Type: Cylindrical roller bearing (NU series) or spherical roller bearing.
• Lifespan Requirement: L10 life ≥ 10,000 hours (under rated conditions).
• Bushing
• Material: Bronze (ZCuAl10Fe3) or self-lubricating composite.
• Function: Supports rotating shafts to reduce wear.
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III. Component Selection and Maintenance Recommendations
1. OEM vs. Aftermarket Parts
• OEM Parts: Fully compatible with Rexroth pumps but costly.
• Aftermarket Parts: Verify material, dimensional tolerances, and performance (e.g., pressure rating, temperature range).
2. Critical Inspection Items
• Pump Leakage: Check gap between port plate and cylinder block (≤0.03mm).
• Abnormal Noise: Inspect bearing clearance (axial/radial ≤0.1mm).
• Pressure Fluctuation: Calibrate control valve set pressure (tolerance ±5 bar).
3. Common Faults and Solutions【表格】
Fault Symptom Possible Causes Solutions
Low output flow Worn pistons, port plate leakage Replace piston assembly; lap port plate
Unstable pressure Stuck control valve, piston seal leakage Clean valve block; replace seals
Abnormal noise Bearing failure, loose swashplate Replace bearings; tighten swashplate bolts
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