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How to Inspect a Used Chinese 6×4 Tractor: 50-Point Checklist

March 17, 2026 12 min read by Kings Truck Team

Knowing how to inspect a used Chinese 6×4 tractor before buying can save you from $10,000-$30,000 in unexpected repairs. Many importers learn this lesson the hard way. This comprehensive 50-point checklist covers everything from frame condition to hidden engine issues, specifically for HOWO, Shacman, and FOTON 6×4 tractors.

Documents First (Before You Inspect)

☐ 1. Chassis number – Verify it matches registration. Check for tampering or re-stamping.

☐ 2. Engine number – Should match documents. Chinese engines sometimes get replaced without documentation.

☐ 3. Year of manufacture – Check VIN 10th digit. Be wary of “2019” trucks that look new.

☐ 4. Service records – Ask for maintenance history. Gaps indicate neglect.

☐ 5. Export certificate – Ensure truck can be legally exported from China.

Frame and Chassis (Structural Integrity)

☐ 6. Frame cracks – Inspect around spring hangers, crossmembers, and 5th wheel mounting. Cracks here are expensive to repair.

☐ 7. Frame straightness – Look from front and rear. A bent frame means the truck has been in a serious accident.

☐ 8. Welding repairs – Poor quality welding on frame is a red flag.

☐ 9. Rust/damage – Surface rust is OK. Penetrating rust near suspension mounts is dangerous.

☐ 10. Crossmember condition – Check all crossmembers for bending or loose bolts.

Engine (WD615, MC11, WP13)

☐ 11. Cold start – Start engine cold. Difficult start indicates glow plug or compression issues.

☐ 12. Smoke color – Black smoke = overfueling; blue = burning oil; white = coolant leak.

☐ 13. Unusual noises – Knock at idle? Tappet noise? Turbo whistle changes?

☐ 14. Oil pressure – Should be 2-5 bar at idle when hot, 4-6 bar at RPM.

☐ 15. Coolant condition – Milky or oily coolant indicates head gasket failure.

☐ 16. Oil condition – Milky oil = water ingress. Metallic flakes = bearing wear.

☐ 17. Turbocharger – Check shaft play (side-to-side minimal, in-out minimal). Oil leaks?

☐ 18. Intercooler – Look for oil stains indicating leaks.

☐ 19. Engine mounts – Cracked mounts cause vibration.

☐ 20. Oil leaks – Valve cover, front/rear main seal, oil pan.

Transmission (FAST Gearbox)

☐ 21. Gear engagement – All gears should engage smoothly without grinding.

☐ 22. Clutch operation – Pedal feel, biting point (should be mid-travel).

☐ 23. Clutch noise – Release bearing noise when pedal pressed?

☐ 24. Gearbox oil – Check level and condition (should not smell burnt).

☐ 25. Synchromesh – Downshift to test synchros (especially 3rd-2nd).

Axles and Suspension

☐ 26. Differential noise – Drive and listen for whine/howl.

☐ 27. Axle seals – Oil leaks at wheel hubs?

☐ 28. Spring hangers – Worn bushings cause wandering.

☐ 29. U-bolts – Tight and not corroded.

☐ 30. Shocks/airbags – Leaks or damage.

Brake System

☐ 31. Brake pad/shoe thickness – Minimum 12mm.

☐ 32. Brake drums – Cracks or heat damage?

☐ 33. Air system leaks – Listen for hissing. Pressure drop test.

☐ 34. Compressor – Builds pressure quickly (5-10 minutes).

☐ 35. Brake chambers – Rusted or damaged?

Cab and Interior

☐ 36. Cab mounts – Worn mounts cause vibration.

☐ 37. Door seals – Water leaks = rust.

☐ 38. A/C function – Cold air?

☐ 39. Instruments – All gauges working?

☐ 40. Seat condition – Worn seat = high mileage.

☐ 41. Steering wheel play – Excessive play = steering box wear.

Tyres and Wheels

☐ 42. Tread depth – Minimum 5mm.

☐ 43. Uneven wear – Indicates alignment or suspension issues.

☐ 44. Tyre age – DOT code. Tyres over 5 years old should be replaced.

☐ 45. Rim condition – Cracks or heavy rust?

Electrical

☐ 46. Lights – All working: headlights, indicators, brake lights.

☐ 47. Alternator – Charging voltage 13.8-14.2V.

☐ 48. Batteries – Date code, terminal condition.

☐ 49. Wiring – Rodent damage or poor repairs?

☐ 50. Warning lights – All clear on dashboard.

Estimated Repair Costs for Common Issues

Issue	Repair Cost (USD)	Negotiation Discount
Clutch replacement	$1,200-1,800	$2,000
Turbo rebuild	$800-1,200	$1,500
Brake system overhaul	$1,500-2,500	$2,500
Injectors (set of 6)	$1,800-2,400	$2,500
Gearbox rebuild	$2,500-4,000	$4,000

Pro Inspector Tip: Always inspect the truck when cold, first start of the day. Warm engines can hide starting issues, smoke, and noises.

When to Hire a Professional Inspector

If you’re buying multiple trucks or spending over $50,000, invest $500-800 in a professional inspection service in China. They’ll provide a detailed report with photos and videos. We can recommend trusted inspectors.

                ✅ Need help inspecting a used truck? Contact us – we can arrange third-party inspection and provide our own assessment.
            