ISUZU NKR NPR King Pin Kit KP-231 with SAE 1045 / 40Cr Alloy Steel Φ30 × 188 mm Complete Steering Knuckle Repair Kit
ISUZU NKR NPR King Pin Kit KP-231 with SAE 1045 / 40Cr Alloy Steel Φ30 × 188 mm Complete Steering Knuckle Repair Kit
Key Attributes
Brand Name:YIMI
Model Number:NKR NPR
Place of Origin:CHINA
Certification:ISO/TS16949
Minimum Order Quantity:20 PCS
Price:Negotiable
Supply Ability:10000 pcs/month
Delivery Time:5-8 Work Days
Payment Terms:T/T
Standard Packaging:Neutral Package or as customers’ request
Product Summary
ISUZU NKR/NPR King Pin Kit 5878309780 5-87830978-0 KP-231 OEM Fit. Made from SAE 1045/40Cr alloy steel with HRC 55-63 hardness. Complete kit includes king pins, bushings, thrust bearings, seals, lock pins, grease fittings, and snap rings. 12-month warranty, ISO/TS 16949 certified, 100% quality inspected.
Product Details
Highlight:
SAE 1045 / 40Cr Alloy Steel King Pin Kit
,Φ30 × 188 mm Steering Knuckle Repair Kit
,Complete Kit Coverage KP-231
Model Number:
KP-231 / MI-08
Engine Compatibility:
4JB1 / 4HF1 / 4BC2
Bearing Size:
54 × 30.2 × 13.8 Mm
King Pin Material:
SAE 1045 / 40Cr Alloy Steel
Weight:
2.99 Kg
King Pin Size:
Φ30 × 188 Mm
Hardness:
HRC 55–63
Position:
Front Axle Left / Right
Product Description
Detailed Specifications & Features
ISUZU NKR NPR King Pin Kit 5878309780 5-87830978-0 KP-231 OEM Fit
Product Overview
King Pin Kit 5878309780 5-87830978-0 KP-231 MI-08 for ISUZU NKR NPR ELF 4JB1 — Verified OEM Fit Φ30*188 mm Steering Knuckle Repair Kit
The King Pin Kit with OEM numbers 5878309780 and 5-87830978-0 — also referenced as KP-231 / MI-08 — is a verified direct-fit replacement for ISUZU NKR / NPR / ELF light trucks equipped with the 4JB1 diesel engine. This king pin kit is a critical steering knuckle component that connects the front axle to the steering knuckle, allowing the front wheels to pivot for steering while supporting the vehicle's weight.
Working Principle
The king pin kit serves as the pivot point for the steering knuckle on the front axle. It allows the knuckle to rotate for steering while maintaining precise alignment between the axle beam and the knuckle assembly. The king pin must withstand both vertical loads (vehicle weight) and horizontal loads (steering forces, braking forces, and road impacts). The ISUZU NKR/NPR front axle uses a Φ30*188 mm king pin with thrust bearings at the top and bushings at the bottom to support the knuckle.
Failure Symptoms
- Steering wander or excessive steering play — worn king pin bushings allow the knuckle to move, causing the vehicle to wander on straight roads
- Uneven or accelerated front tire wear — misaligned knuckle geometry from worn king pins causes cupping or scalloped tire wear patterns
- Front end shimmy or vibration — loose king pins allow the front wheels to oscillate at certain speeds
- Hard steering or binding — seized or corroded king pins prevent smooth steering operation
- Clunking or knocking noise from the front axle — excessive clearance between the king pin and bushings causes metal-to-metal contact
Critical Inspection Note: ISUZU service manuals require that the king pin be replaced, never reused, when the knuckle is removed. Always replace king pins, bushings, bearings, and seals as a complete kit. Inspect the axle beam king pin bore for wear or elongation — if damaged, the axle beam must be replaced.
Technical Specifications
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 5878309780 | ISUZU OEM Parts Database |
| Part Number (Long) | 5-87830978-0 | ISUZU OEM Parts Database |
| Model Number | KP-231 / MI-08 | Product specification |
| Vehicle Models | ISUZU NKR / NPR / ELF / NHR / 100P / 600P | ISUZU application catalog |
| Engine Compatibility | 4JB1 / 4HF1 / 4BC2 | ISUZU application catalog |
| King Pin Size | Φ30 * 188 mm | Product specification |
| King Pin Material | SAE 1045 / 40Cr Alloy Steel | Material certificate |
| Hardness | HRC 55–63 | Hardness testing |
| Weight (per kit) | 2.99 kg | Product specification |
| Certification | ISO/TS 16949 | Third-party system audit |
Product Image
| Part Number: | 5878309780 5-87830978-0 | Product Name: | King Pin Kit |
| Car Model: | NKR NPR | Engine Model: | NKR NPR |
| Condition: | 100% Brand New | Material: | High-strength aluminum alloy & precision bearings |
Vehicle Compatibility
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR | 4JB1 / 4BC2 | 1982–1993 |
| ISUZU | ELF | NKR55 | 4JB1 | 1996–2007 |
| ISUZU | NPR | NPR | 4JB1 / 4HF1 | 1986–1998 |
| ISUZU | NHR | NHR54 | 4JB1 | 1984–1990 |
| JMC | 1030 / 1040 | — | 4JB1 | — |
Important Fitment Notes:
- This king pin kit fits the Φ30*188 mm king pin bore. Confirm the king pin diameter and length against your original component before ordering
- The king pin bushing bore in the steering knuckle may have worn oversized. Measure the knuckle bore before ordering to determine whether a standard or oversize kit is required
- For right-hand drive (RHD) vehicles, verify clearance and orientation
Features & Benefits
| Feature | Benefit + Verification Signal |
|---|---|
| SAE 1045 / 40Cr Alloy Steel King Pin | High hardness (HRC 55–63) and tensile strength for reliable steering pivot under heavy loads — verified by material certificate and hardness testing |
| Precision-Ground Φ30*188 mm | Exact fit in the ISUZU NKR/NPR steering knuckle — direct drop-in installation without modification — verified by CMM dimensional inspection |
| Complete Kit Coverage | Includes king pins, bushings, thrust bearings, seals, lock pins, grease fittings, and snap rings — all components needed for a professional king pin replacement |
| Grease Fitting Included | Allows regular lubrication to extend king pin and bushing service life — verified by component inspection |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified |
Installation Guidelines
IMPORTANT: King pin replacement is a professional-level steering system repair. It must be performed by a qualified technician in a clean workshop. Always replace king pins, bushings, bearings, and seals as a complete kit. Never reuse old king pins.
Recommended Torque Values
| Fastener | Torque |
|---|---|
| King Pin Lock Pin Lock Nut | 18.63–30.41 N·m (13.75–22.43 lb ft) |
| King Pin Cover Plate Bolts (M8) | 25 N·m (20 lb ft) |
| Steering Arm Retaining Bolts | 45 N·m (33 lb ft) |
Maintenance Schedule
- Every 10,000 km: Grease king pins through the grease fittings. Check for steering play
- Every 40,000–50,000 km: Inspect king pin bushings for wear. Check steering knuckle for excessive play
- When steering play is detected: Inspect king pins immediately. Replace if wear is beyond specification
- At any steering system repair: Always replace king pins, bushings, bearings, and seals as a complete kit
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