# Common Tractor Problems and Solutions (Professional Repair Guide)

I. Engine System Faults Difficulty Starting Cold start failure: Inspect high-pressure fuel pump plunger (wear limit 0.02mm); check injector atomization (injection pressure 180-220bar); check battery voltage (≥12.6V); replace glow plugs (resistance value 0.6-1.0Ω); bleed fuel lines (eliminate air lock). When hot start difficulty occurs, troubleshoot the same items listed above one by one. Insufficient Power If the pre-filter water separation alarm triggers, address it promptly; check fuel transfer pump pressure (>0.3MPa). Turbocharger inspection: When power loss, blue smoke from exhaust, or acceleration lag occurs, inspect turbo shaft clearance (>0.15mm requires replacement) and whether the intercooler is clogged, while also performing fuel system diagnostics. II. Transmission System Faults Transmission Abnormalities Symptom | Possible Cause | Solution Shift shock | Clutch plate wear (<3mm) | Replace friction plate set Automatic gear disengagement | Broken shift fork shaft detent spring | Replace spring + synchronizer inspection Transmission noise | Bearing clearance >0.1mm | Replace complete bearing set PTO Faults Output shaft not rotating: Check clutch hydraulic cylinder (stroke ≥25mm); test safety switch continuity. Unstable speed: Adjust governor damping (refer to technical manual); check drive spline wear ( backlash <0.5mm). III. Hydraulic System Faults Weak Lifting Three-step diagnostic method: Test main pump pressure (<15MPa requires service); check distribution valve internal leakage (determined by temperature differential method); cylinder seal test (pressure drop <2% over 5 minutes). Hydraulic Oil Overheating Radiator cleaning procedure: Compressed air reverse blow (0.4MPa); soak in specialized cleaning agent (30 minutes); pressure test (pressure drop <10%). IV. Electrical System Faults Charging Abnormality Alternator inspection: No-load voltage (13.8-14.4V); load current (≥70% of rated value). Circuit testing mnemonic: "Check fuse → test wiring → verify ground." Instrument Faults CAN bus diagnostics: Terminal resistance measurement (60Ω±5%); signal voltage test (2.5-3.5V). V. Steering and Braking System Heavy Steering Priority inspection items: Steering gear deflection (<5°); hydraulic assist pressure (7-10MPa); front wheel alignment parameters (toe-in 3-5mm). Brake Failure Air brake system service: Common symptoms include long braking distance, slow pressure buildup, and single-side braking; possible causes include air compressor piston ring wear and brake wheel cylinder air leakage. VI. Body Accessory Faults Air Conditioning Not Cooling Service procedure: High/low pressure line temperature differential test (>15°C is normal); refrigerant purity analysis (R134a content ≥98%); condenser fin straightening (spacing <1mm). Cabin Water Leaks Sealing treatment plan: Apply silicone grease to sunroof tracks; replace door frame weatherstripping (compression 30%); clear drain holes (φ5mm steel wire). VII. Intelligent System Faults Autonomous Driving Deviation Calibration steps: RTK base station signal strength check (>99%); steering sensor zero-point calibration; wheel speed compensation parameter input. Display Screen Blackout Three-level repair plan: Basic: Restart power (disconnect for 5 minutes); Intermediate: Flash system firmware; Advanced: Replace display assembly. VIII. Seasonal Fault Prevention Winter Special Care Diesel anti-gelling treatment: Add 1% pour point depressant to Grade -10 diesel; install fuel line heating tape (power 60W/m). Battery maintenance: Constant-temperature charging during nighttime storage; adjust electrolyte density to 1.28g/cm³. Summer Protection Overheating prevention measures: Install insect screen on radiator; switch hydraulic oil to HV46 grade; reduce tire pressure by 10% (during high-temperature periods). Recommended Professional Repair Tools Essential testing equipment: Diesel engine diagnostic tool (supporting common rail system); hydraulic tester (0-40MPa range); multifunction oscilloscope (CAN bus analysis). Self-made tools: PTO spline calibrator (modified from Φ35mm steel pipe); hydraulic pipe wrench (opening angle 15°). Important Note: When encountering ECU-related faults, always read fault codes first (OBD interface is usually located under the instrument panel). 80% of "difficult miscellaneous faults" can be traced to their root cause through data stream analysis.