Common Tractor Problems and Solutions (Professional Repair Guide)

I. Engine System Faults Difficult Starting Cold Start Failure: Check the high-pressure fuel pump plunger (wear limit 0.02mm); inspect injector atomization (injection pressure 180-220bar); check battery voltage (≥12.6V); replace glow plugs (resistance value 0.6-1.0Ω); bleed the fuel lines (remove air locks). For hot start difficulty, troubleshoot the same items one by one as above. Insufficient Power If the primary filter water separator alarm triggers, address it promptly; check the fuel transfer pump pressure (>0.3MPa). Turbocharger Inspection: When symptoms such as power loss, blue exhaust smoke, or acceleration lag occur, check the turbo shaft clearance (replace if >0.15mm) and whether the intercooler is clogged, while performing fuel system diagnostics. II. Drivetrain System Faults Transmission Abnormalities Fault Symptom | Possible Cause | Solution Shift shock | Clutch plate wear (<3mm) | Replace friction plate set Automatic gear disengagement | Shift fork shaft locating spring broken | Replace spring + synchronizer inspection Transmission noise | Bearing play >0.1mm | Replace entire bearing set PTO Faults Output shaft not rotating: Check the clutch hydraulic cylinder (stroke ≥25mm); test the safety switch continuity. Unstable speed: Adjust the governor damping (refer to the technical manual); check drive spline wear (backlash <0.5mm). III. Hydraulic System Faults Weak Lifting Three-Step Diagnostic Method: Test the main pump pressure (repair if <15MPa); check the distribution valve internal leakage (determine via temperature differential method); perform cylinder seal test (pressure hold for 5 minutes with drop <2%). Hydraulic Oil Overheating Radiator Cleaning Procedure: Reverse blow with compressed air (0.4MPa); soak in specialized cleaning agent (30 minutes); pressure test (pressure drop <10%). IV. Electrical System Faults Charging Abnormalities Alternator Inspection: No-load voltage (13.8-14.4V); load current (≥70% of rated value). Circuit Inspection Mnemonic: "Check fuses → test wiring → verify grounding." Instrument Faults CAN Bus Diagnostics: Terminal resistance measurement (60Ω±5%); signal voltage test (2.5-3.5V). V. Steering and Braking Systems Heavy Steering Priority Checks: Steering gear play (<5°); hydraulic power assist pressure (7-10MPa); front wheel alignment parameters (toe-in 3-5mm). Brake Failure Air Brake System Repair: Common symptoms include long braking distance, slow air pressure buildup, and one-sided braking; possible causes include air compressor piston ring wear and brake chamber air leaks. VI. Body and Accessory Faults Air Conditioning Not Cooling Repair Procedure: High/low-pressure line temperature differential check (>15°C is normal); refrigerant purity analysis (R134a content ≥98%); condenser fin straightening (gap <1mm). Cab Rain Leaks Sealing Solutions: Apply silicone grease to sunroof tracks; replace door frame seals (compression rate 30%); clear drain holes (with φ5mm steel wire). VII. Intelligent System Faults Autonomous Driving Deviation Calibration Steps: Check RTK base station signal strength (>99%); steering sensor zero-point calibration; input wheel speed compensation parameters. Black Screen on Display Three-Level Repair Plan: Level 1: Restart power (disconnect for 5 minutes); Level 2: Reflash system firmware; Level 3: Replace display assembly. VIII. Seasonal Fault Prevention Winter Special Care Diesel Anti-Gelling Treatment: Add 1% pour point depressant to -10 diesel; install fuel line heating tape (power 60W/m). Battery Maintenance: Store with constant-temperature charging overnight; adjust electrolyte density to 1.28g/cm³. Summer Protection Overheating Prevention Measures: Install insect screen on radiator; switch to HV46 hydraulic oil; reduce tire pressure by 10% (during high-temperature periods). Recommended Professional Repair Tools Essential Diagnostic Equipment: Diesel engine diagnostic tool (with common rail system support); hydraulic tester (0-40MPa range); digital oscilloscope multimeter (CAN bus analysis). DIY Tools: PTO spline alignment tool (modified from Φ35mm steel pipe); hydraulic hose removal wrench (opening angle 15°). Important Note: When encountering ECU-related faults, always read the fault codes first (the OBD port is typically located under the dashboard). 80% of "stubborn problems" can be traced to their root cause through data stream analysis.