Heavy Duty Tie Rod End with Forged Steel Construction and ISO 9001 Certified for Japanese Trucks

The Tie Rod End (Steering Ball Joint) with OEM number 3777703951 is a verified replacement part designed for heavy-duty Japanese commercial trucks, including HINO 500 Series / FS Series, ISUZU Forward / N-Series NPR, and MITSUBISHI Fuso Canter / Fighter models. As a critical steering linkage component, the tie rod end connects the steering rack or idler arm to the steering knuckle, converting rotational steering input into precise wheel movement.

Manufactured to OE specifications under ISO 9001 and TS16949 quality certifications, this steering ball joint features precision-forged steel construction with heat-treated components, engineered to withstand the extreme loads, vibration, and road shock encountered in heavy-duty truck operations.

Compatible Vehicle Brands (verify with your specific model and VIN)

• Quality Certification - Certified under ISO 9001 / TS16949 quality management systems, ensuring consistent manufacturing standards across each production batch.
• OE Number Interchange - Cross‑reference: 3777703951, 3777703941, 2389990225001, 2389990224001. Note that the part is also listed as compatible with SCANIA 1358792, 2051165 for certain cross‑fit applications — verify fitment with your specific vehicle.
• Comprehensive Quality Control - Each component undergoes dimensional inspection, material hardness testing, dynamic load testing, and 100% functional assembly verification under load to ensure reliable operation in heavy-duty truck service conditions.

When to replace tie rod ends (warning signs): Excessive vertical play when lifting wheel, uneven or "feathered" tire wear, steering wheel wander / loose feel on highway, clunking noise when turning at low speeds, or boots torn with visible contamination.

1. Safely lift vehicle and support the axle.
2. Remove wheel and locate tie rod end at steering knuckle.
3. Remove cotter pin and castle nut from ball stud.
4. Use a dedicated ball joint separator / pickle fork (do NOT hammer stud — risks damaging steering knuckle).
5. Remove old tie rod end from steering linkage.
6. Record thread length position before removal — critical for toe alignment reference.
7. Compare new tie rod end with old unit — ball stud taper angle and length must match.
8. Clean the mounting hole on steering knuckle, then install new tie rod end with new castle nut.
9. Torque castle nut to 60–90 Nm (factory specification for medium‑heavy trucks — confirm with vehicle manual).
10. Insert a new cotter pin through castle nut slots and stud hole — bend legs securely.
11. Reinstall wheel, lower vehicle, and perform professional wheel alignment (toe adjustment) — mandatory.
12. Road test: verify straight tracking, no wander, and smooth steering return after turns.

• Visual inspect dust boots and check for grease leakage every 20,000 km.
• Check for axial play every tire rotation — any detectable movement means immediate replacement.
• Re‑grease through grease fitting every 30,000 km (or per vehicle manufacturer schedule).
• Always replace tie rod ends in pairs (left and right) to maintain even steering response.