Steering Knuckle King Pin Kit KP-133 40025-Z5025 for Nissan UD CM-90 — 35mm Diameter 205mm Length SAE 1045 Carbon Steel
| King Pin Diameter: | 35mm / 35.15mm | King Pin Length: | 205mm |
| Material: | SAE 1045 Carbon Steel | Surface Hardness: | HRC50–63 |
| Case Hardening Depth: | 0.9–1.2mm | Kit Contents: | King Pin, Bearings, Bushings, Shims, Seals, Etc |
| OEM Number: | 40025-Z5025 / 40025Z5025 | Model Number: | KP-133 / MN-53 |
| High Light: | SAE 1045 Carbon Steel King Pin Kit,35mm Diameter Steering Knuckle Kit,205mm Length King Pin Kit |
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The Steering Knuckle King Pin Kit, Model KP-133 / MN-53, with OEM numbers 40025-Z5025 / 40025Z5025, is a verified direct-fit replacement for Nissan UD CM-90 series heavy-duty trucks. This king pin kit is a complete repair solution for front axle steering knuckle maintenance, including king pins, bearings, bushings, shims, and seals — widely used in Nissan UD CM-90 / CM-85 / Condor series trucks.
The king pin is the core pivot component of the front axle steering system, connecting the axle beam to the steering knuckle, allowing the wheels to pivot left and right for steering. This king pin kit includes the following components:
- King Pin — Precision-machined pivot pin, bearing vertical front axle loads and steering lateral forces
- Bearings — Reduce friction between the king pin and steering knuckle for light steering effort
- Bushings — Provide a wear-resistant sliding interface, extending king pin service life
- Shims / Seals — Adjust axial clearance and prevent grease leakage and contaminant ingress
When the king pin and associated bearings/bushings wear out, the steering system develops play and vibration. This kit provides all necessary components for a complete steering knuckle overhaul.
Replace immediately if any of these symptoms occur:
- Loose Steering / Excessive Play — Increased steering wheel free play; delayed steering response
- Front Wheel Wobble / Vibration — Noticeable wheel oscillation while driving, especially on rough roads
- Heavy Steering — Steering wheel becomes significantly heavier
- Uneven Tire Wear — Feathering or irregular wear on front tires
- Brake Pull — Vehicle pulls to one side during braking
- Clunking Noises — Metallic knocking sounds from front axle while driving or turning
| Part Number: | 40025-Z5025 |
| Product Name: | Steering Knuckle King Pin Kit |
| Car Model: | Nissan UD CM-90 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
| Brand | Model/Chassis | Years | Notes |
|---|---|---|---|
| Nissan UD | CM-90 | 1976–1980 | Primary fitment |
| Nissan UD | CM-85 | 1976– | Primary fitment |
| Nissan UD | Condor | 1976– | Primary fitment |
| Nissan UD | CW8# / CWB# | — | Compatible fitment |
| Nissan UD | CW40 | — | Compatible fitment |
- This is a complete king pin repair kit — includes all components for both left and right sides
- Confirm king pin diameter (35mm / 35.15mm) matches your front axle before purchase
- Recommended to replace both left and right sides simultaneously for consistent steering performance
- Use special press tools during installation — do not hammer the king pin or bushings
- Grease thoroughly after installation and adjust king pin axial clearance to specification
- For 100% accurate fitment, please provide VIN (Chassis Number) or chassis model
| QC Item | Verification Method | Standard |
|---|---|---|
| King Pin Diameter (35mm) | Precision OD gauge | ±0.02mm tolerance |
| King Pin Length (205mm) | Precision gauge | ±0.5mm tolerance |
| Surface Hardness (HRC50–63) | Rockwell hardness tester | HRC50–63 |
| Case Depth (0.9–1.2mm) | Metallographic analysis | 0.9–1.2mm |
| Material Composition | Spectrographic analysis | Meets SAE 1045 standard |
| Bushing ID Accuracy | Precision bore gauge | Meets OEM standards |
| Visual Inspection | 100% visual inspection | No cracks, burrs, or rust |
IMPORTANT: The king pin is a critical safety component of the front axle steering system. Improper installation may cause steering failure or wheel detachment, leading to serious traffic accidents. Installation should be performed by qualified chassis specialists. Always perform wheel alignment and a road test after installation.
Installation Steps (Refer to workshop manual):
- Safety Prep — Park on level ground, chock wheels, lift and support front axle
- Remove Front Wheel — Remove front wheel tire and hub assembly
- Remove Steering Knuckle — Remove tie rod end, brake caliper, and other components; remove steering knuckle from axle beam
- Press Out Old King Pin — Use special press tools to press old king pin out of the knuckle
- Clean Mounting Holes — Thoroughly clean king pin mounting holes in knuckle and axle beam
- Inspect Mounting Holes — Check for scoring, wear, or deformation
- Install New Bushings — Use special press tools to press new bushings into knuckle (do not hammer)
- Install New King Pin — Insert new king pin through knuckle and axle beam; ensure smooth fit
- Install Bearings & Shims — Install new bearings and adjustment shims; set king pin axial clearance to specification
- Grease — Inject sufficient high-quality grease through grease fittings
- Install Steering Knuckle — Reinstall knuckle assembly onto axle beam; torque mounting bolts to specification
- Reinstall Components — Reinstall brake caliper, tie rod end, and other components
- Wheel Alignment — Wheel alignment is mandatory — adjust toe and camber angles to specification
- Road Test — Perform road test — confirm smooth steering, no pulling, no abnormal noise
| Item | Interval |
|---|---|
| Steering System Inspection | Every 10,000 km or 6 months |
| King Pin Greasing | Every 5,000 km or 3 months |
| King Pin Replacement | When loose steering, noise, uneven tire wear is found; or inspect at 200,000 km |
- Packaging: Neutral packaging / Custom branded packaging
- Packaging Unit: 1 kit/box
- MOQ: 5 kits
- Supply Capacity: 10,000 sets/month
- Delivery Time: 5–8 working days (standard orders)
- Payment Terms: T/T, Western Union
- Target Customers: Truck parts wholesalers, repair chain stores, fleet purchasers, cross-border e-commerce sellers
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