Clutch Slave Cylinder 8-98040043-0 8980400430 For ISUZU NMR NLR 4JJ1 3.0L Diesel — OEM Cast Iron Hydraulic Clutch Actuator
| OEM Part Number: | 8-98040043-0 / 8980400430 | Part Name: | Clutch Slave Cylinder / CYLINDER SLAVE CLU |
| Bore Diameter: | 7/8″ (22.2mm) | Material: | High-Grade Cast Iron |
| Vehicle Compatibility: | ISUZU NMR, NLR, ELF | Engine Compatibility: | ISUZU 4JJ1 3.0L Diesel |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | ISUZU clutch slave cylinder,hydraulic clutch actuator 4JJ1,OEM cast iron clutch cylinder |
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The Clutch Slave Cylinder with OEM numbers 8-98040043-0 (also listed as 8980400430) is a verified OEM-grade direct replacement for ISUZU NMR and compatible NLR series trucks equipped with the 4JJ1 3.0L diesel engine.
- OEM Specification — Verified by ISUZU OEM part numbers 8-98040043-0, 8980400430, and supersession 8-98040043-1 / 8980400431
- Precision 7/8″ (22.2mm) Bore — Delivers consistent hydraulic pressure for reliable clutch actuation
- Proven Durability — Constructed from high-grade cast iron for superior heat and corrosion resistance
- Broad Compatibility — Fits ISUZU NMR, NLR, ELF models with 4JJ1 engine
If your clutch slave cylinder is failing, you may experience one or more of the following symptoms:
- Soft or Spongy Clutch Pedal — Pedal feels unusually soft, spongy, or goes to the floor without resistance
- Difficulty Shifting Gears — Hard to engage or disengage gears, accompanied by grinding noises
- Clutch Pedal Heavy or Stiff — Pedal requires excessive force to depress
- Clutch Drag / Incomplete Disengagement — Vehicle creeps forward with clutch fully depressed
- Visible Fluid Leakage — Brake/clutch fluid seeping from the slave cylinder area
- Clutch Engagement Point Changes — Pedal engages very close to the floor or very high
| Brand | Model | Chassis / Series | Engine | Notes |
|---|---|---|---|---|
| ISUZU | NMR | N-Series | 4JJ1 3.0L Diesel | Primary application |
| ISUZU | NLR | N-Series | 4JJ1 3.0L Diesel | Compatible |
| ISUZU | ELF | N-Series | 4JJ1 3.0L Diesel | Compatible |
Guarantees factory-fit quality and performance
Delivers consistent hydraulic pressure for reliable clutch actuation
Provides exceptional durability and corrosion resistance
Specifically engineered for ISUZU 3.0L diesel engines
No modifications required — engineered as a direct match
Guarantees dependable operation and leak-free performance
Guarantees zero wear and full service life
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 7/8″ bore diameter and mounting specifications |
| Material Composition | Cast iron analysis to verify structural integrity and corrosion resistance |
| Bore Surface Test | 100% surface testing to ensure optimum sealing surface |
| Leakage Test | 100% hydraulic pressure test to guarantee zero fluid leakage |
| Piston Function Test | Full actuation test to verify smooth piston movement and seal integrity |
| Durability Cycle Test | 500+ hour fatigue testing to verify long-term reliability |
| Final Assembly Inspection | 100% visual and functional inspection before packaging |
Pre-Installation Checklist:
- Ensure the vehicle is securely supported on jack stands or a lift
- Clean the area around the slave cylinder to prevent contamination
- Verify your vehicle's engine code (4JJ1) — this cylinder is specifically designed for this engine
- Inspect the clutch hydraulic line for damage or corrosion
- Check the clutch fork and release bearing for wear
- Use new brake fluid (DOT 3 or DOT 4) from a sealed container
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months
- Fluid Replacement: Every 2 years or 40,000 km
- Replacement: Immediately if failure symptoms appear
- Packaging: Protective carton box packaging
- Country of Origin: Japan
- Delivery Time: 1-3 working days
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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