ISUZU NPR94 4HF1 Clutch Master Cylinder with 13/16 inch Bore Size, Hard Anodized Piston, and EPDM Rubber Piston Cup
| Hardness: | Higher Than 110 HB | Bore Size: | 13/16 Inch (20.64 Mm) |
| Piston Treatment: | Hard Anodized | Material: | Aluminium (ZL111) |
| Net Weight: | 0.35 Kg | Surface Treatment: | Electrophoresis Process |
| Rubber Piston Cup: | EPDM (EP-35, Japan) | Honing Process: | Multiple Times (at Least 2 Times) |
| High Light: | 13/16 inch Bore Size Clutch Master Cylinder,Hard Anodized Piston Clutch Pump Assembly,EPDM Rubber Piston Cup Hydraulic Clutch Cylinder |
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Clutch Master Cylinder with OEM numbers 8971024370, 8980976940, 8-97102437-0, and 8-98097694-0 is a verified direct-fit replacement for ISUZU NPR94/NKR66E/NQR71/NPR/NQR light and medium-duty trucks equipped with 4HF1/4HG1 diesel engines. This critical hydraulic component converts clutch pedal force into hydraulic pressure to actuate the clutch release mechanism.
When the clutch pedal is depressed, the push rod moves the piston inside the 13/16 inch (20.64 mm) bore, pressurizing clutch fluid. This hydraulic pressure transmits through the clutch line to the slave cylinder, moving the release fork to disengage the clutch disc. The aluminum housing ensures lightweight construction and excellent heat dissipation, while the precision-honed bore and hard-anodized piston guarantee smooth operation and long service life.
- Spongy or sinking clutch pedal — internal fluid bypass reduces hydraulic pressure
- Clutch fluid leakage — visible fluid traces on firewall or under dashboard
- Difficulty engaging/disengaging gears — insufficient hydraulic pressure prevents full clutch release
- Clutch pedal doesn't return to rest position — internal master cylinder damage
- Clutch fluid contamination — degraded rubber particles from worn seals
| Specification | Details |
|---|---|
| Part Numbers | 8971024370, 8980976940, 8-97102437-0, 8-98097694-0 |
| Bore Size | 13/16 inch (20.64 mm) |
| Material | Aluminium (ZL111), Hardness >110 HB |
| Surface Treatment | Electrophoresis Process |
| Piston Treatment | Hard Anodized |
| Honing Process | Multiple Times (at least 2 times) |
| Rubber Piston Cup Material | EPDM (EP-35, Japan) |
| Net Weight | 0.35 kg |
| Certification | ISO/TS 16949 |
| Type | Number |
|---|---|
| Primary OEM — Short | 8971024370, 8980976940 |
| Primary OEM — Long | 8-97102437-0, 8-98097694-0 |
| Interchange Part Numbers | 8-97124-109-0, 8-97167-404-0, 8-97210-748-1, 8-97210-748-0, 8-97102-021-0, 8-98083-061-0 |
| Competitive Cross-Reference | TRW PNB847, SEIKEN 110-80586, JAPANPARTS FR-914, JMC CMC6940 |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR66E | 4HF1 | 1994–2002 |
| ISUZU | ELF | NKR66 | 4HF1 | 1994–2002 |
| ISUZU | NPR | NPR94 | 4HF1 | 1994–2002 |
| ISUZU | NPR | NPR66 | 4HF1 | 1994–2002 |
| ISUZU | NQR | NQR71 | 4HG1 | 1994–2002 |
| ISUZU | NQR | NQR75 | 4HG1 | 1994–2002 |
| QC Item | Verification Method |
|---|---|
| Bore Diameter (13/16" / 20.64 mm) | CMM, 100% inspection |
| Material Hardness (ZL111, >110 HB) | Hardness tester, batch sampling |
| Bore Surface Finish (Honing) | Surface roughness tester, 100% inspection |
| Pressure Tightness | Hydrostatic pressure test, 100% inspection |
| Thread Inspection | Thread gauge, 100% inspection |
- Disconnect battery negative terminal and remove clutch fluid from reservoir
- Disconnect clutch line and remove clevis pin connecting clutch pedal to push rod
- Remove mounting nuts securing master cylinder to firewall
- Bench-bleed new master cylinder before installation
- Install new master cylinder and torque mounting nuts to specification
- Connect clutch line and refill with fresh DOT 3 or DOT 4 brake fluid
- Bleed clutch hydraulic system completely and check for leaks
- Perform road test to verify proper clutch operation
- Standard Packaging: Sealed bag + moisture barrier + neutral carton
- Custom Packaging: Neutral box, color box, or customer-branded packaging
- Suitable For: Clutch system repair shops, ISUZU parts distributors, fleet maintenance centers
- Minimum Order Quantity: 5 PCS
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