OEM Verified King Pin Kit 40025-NA01J for NISSAN UD MK210 Truck with Pre-Sized No-Ream Design and High-Grade Steel Construction

King Pin Kit with OEM number 40025-NA01J (40025NA01J) is a verified direct-fit steering repair set designed for NISSAN UD MK210 trucks and compatible NISSAN UD Condor chassis. This king pin kit serves as the critical pivot assembly connecting the steering knuckle to the front axle beam, enabling controlled and precise steering movement across the full range of vehicle operation.

The king pin functions as the central pivot of the steering system. When the steering wheel is turned, the king pin allows the steering knuckle — and therefore the wheel — to rotate smoothly around a vertical axis. A worn or damaged king pin directly compromises steering precision, tire wear patterns, and overall vehicle safety.

• Uneven or premature front tire wear — appearing as one-sided, feathered, or diagonal wear patterns
• Steering wander or shimmy — vehicle pulls or drifts, especially after hitting bumps or at highway speeds
• Clunking, popping, or grinding noises — audible from front axle when turning or on uneven surfaces
• Excessive steering play — vertical play at wheel exceeds 1/8 inch (3.2 mm)
• Wheel wobble — persistent vibration through steering wheel not corrected by balancing

Fitment Note: NISSAN UD MK-series trucks share front axle components across multiple chassis codes. This kit is designed for the MK210 platform and is also compatible with the wider MK-series range listed above. Please provide your VIN, chassis number, or axle plate number to confirm exact fitment.

1. Lift and secure the vehicle on a level surface. Remove wheels, brake calipers, tie rod ends, and drag link as required
2. Remove the old king pin using a hydraulic press or specialized king pin removal tool
3. Clean and inspect the axle beam bore and steering knuckle bore for wear or deformation
4. Install new bushings using proper driver tools — pre-sized bushings require no reaming
5. Insert the new king pin — ensure it is centered and seated flat
6. Torque specification: Consult the NISSAN UD MK210 workshop manual for exact values
7. Check vertical play — verify axial play is within OEM specification
8. Lubricate through grease nipples with high-quality chassis grease

• Lubrication: Grease king pins at every chassis lubrication interval (typically 10,000-15,000 km)
• Inspection: Check for vertical play, steering looseness, and uneven tire wear at every major service
• Full replacement interval: Rated for 80,000 - 150,000 km depending on operating conditions
• Alignment check: Perform front-end alignment after king pin replacement

• Each kit individually wrapped with protective packaging in heavy-duty cardboard box
• Suitable for fleet maintenance departments, truck repair workshops, parts distributors, and wholesale buyers
• MOQ: 2 pieces — bulk pricing available
• Supply capacity: Available for large fleet orders