Komatsu PC4050 Hydraulic Pump
3 week ago
Product details
1. Product Overview
TheKomatsu PC40/50 Hydraulic Pumpis a core hydraulic power component designed by Komatsu for its PC40/50 series compact excavators. It is avariable-displacement piston pumpthat converts mechanical energy from the engine into hydraulic energy, supplying high-pressure oil to the excavator’s actuators (e.g., travel, swing, boom, arm, bucket).
Applicable Models:
• PC40: 4-ton compact excavators (e.g., PC40-7, PC40MR-3)
• PC50: 5-ton compact excavators (e.g., PC50UU-2, PC50MR-5)
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2. Core Structure and Working Principle
(1) Key Components
1. Variable Pump Body:
• Features aswashplate-type axial piston designwith adjustable displacement via swashplate angle.
• Typical model:K3V63DT(63 cc/rev displacement, dual-pump configuration).
2. Regulator:
• Controls pump displacement in response to engine speed and load demands.
• Includes pressure compensator valves and load-sensing valves.
3. Charge Pump:
• Supplies low-pressure oil (~2–3 MPa) for lubrication, cooling, and makeup oil.
4. Control Valve Block:
• Integrates safety valves and relief valves to prevent system overpressure.
(2) Working Principle
• Variable Control: The regulator adjusts the piston stroke based on system pressure or load signals, enabling stepless displacement regulation (0–maximum).
• Dual-Pump Configuration: Some models use tandem pumps to increase system flow (e.g., PC50MR-5 delivers 2×120 L/min total flow).
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3. Key Technical Specifications (K3V63DT Example)
【表格】
Parameter Value Notes
Theoretical Displacement 63 cc/rev (single pump) 126 cc/rev total in dual-pump setup
Rated Pressure 28 MPa (continuous) / 32 MPa (peak) Suitable for high-load operations
Rated Speed 2200 rpm Matches engine output speed
Charge Pressure 2.1 MPa Ensures system lubrication/cooling
Weight ~85 kg (single pump) Includes regulator and charge pump
Recommended Fluid ISO VG46 anti-wear hydraulic oil Viscosity index ≥130, cleanliness NAS 1638 ≤ Class 9
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4. Common Failures and Diagnosis
(1) Symptoms and Causes
【表格】
Symptom Possible Causes
Insufficient Pressure Internal leakage (worn pistons/valve plate), regulator failure, low charge pressure
Unstable Flow Stuck variable mechanism, contaminated fluid, worn charge pump
Abnormal Noise Damaged bearings, excessive piston-cylinder clearance, air ingestion
High Oil Temperature Clogged cooler, improper fluid viscosity, reduced pump efficiency
(2) Diagnostic Steps
1. Pressure Testing:
• Use a pressure gauge to measure pump outlet pressure (should approach rated value).
• If pressure is below setpoint, inspect the regulator or relief valve.
2. Flow Testing:
• Measure actual output flow with a flow meter and compare to theoretical values.
• Low flow may indicate variable mechanism failure or internal leakage.
3. Fluid Analysis:
• Test for metal particles (ferrography) to identify worn components.
• Excessive water content degrades lubrication.
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5. Maintenance and Upkeep
(1) Daily Checks
• Fluid Level: Verify hydraulic tank level is between upper/lower marks daily.
• Oil Temperature: Maintain working temperature at 50–80°C (stop if >90°C).
• Noise/Vibration: Investigate immediately if abnormal.
(2) Scheduled Maintenance
【表格】
Task Interval Key Points
Fluid Replacement 1000 hours Use Komatsu-approved fluid (e.g., HD46); clean tank and filters during change.
Filter Replacement 500 hours Replace suction, return, and high-pressure filters (≤10 μm rating).
Seal Replacement 2000 hours Use high-temperature fluororubber O-rings/shaft seals.
Regulator Calibration Annual Requires dedicated test bench for pressure-flow curve adjustment.
(3) Storage Guidelines
• Fill pump with hydraulic oil for long-term storage; rotate shaft 1–2 turns monthly to prevent rust.
• Avoid direct sunlight; store at -20°C to +50°C.
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