1. TM02 Travel Assembly
Function & Components
• Core Role: Supports equipment weight, transmits driving force to tracks/tires, enabling movement (forward/backward/steering).
• Typical Components:
• Drive Sprocket: Transmits hydraulic motor power to the track.
• Track Rollers: Supports equipment load, reduces track sagging.
• Idler Wheel: Maintains track tension, prevents derailment.
• Track Shoes: Ground contact surface, provides traction.
• Track Chain: Connects components, transmits power.
Technical Specifications (Example)
【表格】
Parameter TM02 Typical Value
Suitable Equipment 18–25-ton excavators/bulldozers
Track Width 500–600 mm
Ground Contact Length 3,000–3,500 mm
Sprocket Teeth 19–21 teeth
Roller Quantity 7–9 per side
Weight 800–1,200 kg (varies by config)
Applications
• Equipment Models: Komatsu PC200-8, Caterpillar 320D, Hitachi ZX200.
• Work Scenarios: Earthmoving, mining, road construction (frequent movement).
Common Issues
• Track Breakage: Fatigue from overload/rock impact.
• Roller Oil Leak: Seal aging, requires wheel replacement.
• Sprocket Wear: Improper track tension accelerates tooth wear.
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2. MAG-18VP (Hydraulic Pump/Motor)
Function & Type
• Possible Types:
• Variable Displacement Piston Pump: Adjusts flow based on pressure for travel drive.
• Fixed Displacement Motor: Converts hydraulic energy to mechanical rotation for track propulsion.
• Model Breakdown:
• MAG: Manufacturer code (e.g., Magnum series) or technology type (e.g., magnetic valve integration).
• 18: Displacement 18 cm³/rev or rated flow 18 L/min.
• VP: Variable Pressure or Variable Displacement.
Technical Specifications (Example)
【表格】
Parameter MAG-18VP Typical Value
Displacement 18 cm³/rev
Rated Pressure 25 MPa (3,625 psi)
Peak Pressure 30 MPa (4,350 psi)
Speed Range 0–2,200 rpm
Drive Power 45 kW (60 HP)
Port Sizes Inlet G1¼ (BSPP), Outlet G1
Applications
• Equipment Models: Hydraulic systems paired with TM02 assemblies (e.g., Komatsu PC200 travel pump).
• Work Scenarios: Precision control of travel speed/torque (e.g., climbing, steering).
Common Issues
• Low Pressure: Internal leakage or regulator failure.
• Abnormal Noise: Bearing wear or air ingress into hydraulic oil.
• Overheating: High oil viscosity or cooling system failure.
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3. PHV-2B-20 (Proportional Hydraulic Valve)
Function & Type
• Core Role: Electrically controls hydraulic flow/pressure proportionally for precise travel speed/direction adjustment.
• Possible Types:
• Proportional Pressure-Reducing Valve: Controls system pressure.
• Proportional Flow Valve: Regulates actuator speed.
• Model Breakdown:
• PHV: Proportional Hydraulic Valve.
• 2B: Double-acting or 2-stage control.
• 20: Rated pressure 20 MPa or port size 20 mm.
Technical Specifications (Example)
【表格】
Parameter PHV-2B-20 Typical Value
Control Method Electric proportional (PWM/voltage signal)
Rated Flow 60 L/min
Response Time ≤50 ms
Repeatability ±1%
Protection Rating IP65 (dust/waterproof)
Applications
• Equipment Models: Electrically controlled travel systems (e.g., Caterpillar e-series excavators).
• Work Scenarios: Precision travel control (e.g., fine excavation, coordinated operations).
Common Issues
• Control Failure: Electrical interference or spool sticking.
• Leakage: Seal aging or valve body cracking.
• Slow Response: Filter clogging or oil contamination.
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4. System Synergy Principle
1. Operator Input: Joystick sends electrical signals to PHV-2B-20 valve.
2. Flow Adjustment: Valve modulates opening based on signals to control MAG-18VP pump oil flow.
3. Power Output: Pump delivers high-pressure oil to drive the travel motor, which rotates the final drive and sprocket.
4. Track Movement: Sprocket rotation engages tracks with the ground for equipment motion.
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5. Selection & Procurement Recommendations
1. Compatibility Verification:
• Confirm TM02 assembly matches equipment model (e.g., Komatsu SD22 undercarriage requires dedicated assembly).
• Check MAG-18VP displacement/pressure alignment with original pump.
• Verify PHV-2B-20 control signal type (e.g., 0–10V or PWM).
2. Alternative Solutions:
• TM02 substitute: Boluo BL200 undercarriage (requires mounting hole adjustments).
• MAG-18VP replacement: Kawasaki K3V112 pump (requires plumbing modifications).
3. Supplier Selection:
• Prioritize OEM or authorized distributors (e.g., Komatsu Genuine Parts).
• Third-party brands must provide ISO certification and performance test reports.
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6. Maintenance & Troubleshooting
【表格】
Component Daily Checks Common Failures Solutions
TM02 Assembly Track tension, roller leaks Track derailment, sprocket slip Adjust tension cylinder, replace worn parts
MAG-18VP Oil temperature, noise, pressure gauge Pressure fluctuation, low output Clean filters, replace bearings
PHV-2B-20 Signal stability, valve temperature Control delay, leakage Calibrate electrical signals, replace seals
