OEM Vacuum Pump Return Hose 8-94339073-1 8943390731 8-94339073-0 For ISUZU NPR66 / NPR71 / NQR70 / NQR75 4HF1 4HG1-T Diesel — Rubber Oil Return Line
| OEM Part Number: | 8-94339073-1 / 8943390731 / 8-94339073-0 / 8943390730 | Part Name: | HOSE; VAC PUMP RETURN / Vacuum Pump Return Hose |
| Inner Diameter: | 7/16" (11 Mm) | Overall Length: | 145 Mm |
| Center-to-Center Span: | 109 Mm | Material: | Unhardened Vulcanized Rubber |
| Net Weight: | Approx. 0.2 Kg | Engine Compatibility: | ISUZU 4HF1, 4HG1-T, 4HG1 |
| Vehicle Compatibility: | ISUZU NPR66, NPR71, NQR70, NQR75 | Production Years: | 1999–2006 |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | ISUZU NPR66 vacuum pump hose,OEM rubber oil return line,4HF1 diesel return hose |
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The Vacuum Pump Return Hose with OEM numbers 8-94339073-1 (also listed as 8943390731, 8-94339073-0, 8943390730) is a verified OEM-grade direct replacement for ISUZU NPR series trucks equipped with the 4HF1 and 4HG1-T diesel engines.
- Oil Leakage: Oil seepage or dripping from vacuum pump area
- Brake Booster Warning Light: Dashboard warning with soft/spongy brakes
- Squealing or Hissing Noise: Unusual noises from vacuum pump area
- Hard Brake Pedal: Increased pedal effort required
- Visible Cracks or Hardening: Brittle or degraded rubber appearance
- Oil Residue on Hose: Visible oil mist accumulation on exterior
| Brand | Model | Chassis / Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR66 | N-Series | 4HF1, 4HG1-T | 1999-2006 |
| ISUZU | NPR71 | N-Series | 4HF1, 4HG1-T | 1998-2002 |
| ISUZU | NQR70 | N-Series | 4HF1, 4HG1-T | 1999-2004 |
| ISUZU | NQR75 | N-Series | 4HF1, 4HG1-T | 1998-2004 |
Guarantees factory-fit quality and performance with verified ISUZU OEM part numbers
7/16" inner diameter and 145mm length ensure correct fitment and proper routing
Unhardened vulcanized rubber provides exceptional resistance to oil, heat, and vibration
No modifications required - engineered as direct match for original hose
Fits multiple ISUZU NPR models with 4HF1 and 4HG1-T engines
Guarantees zero wear, immediate sealing performance, and full service life
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 7/16" inner diameter, 145mm length, and 109mm center span |
| Material Composition | Unhardened vulcanized rubber analysis for oil resistance and thermal stability |
| Leakage Test | 100% pressure testing for zero oil or air leakage |
| Oil Resistance Test | Extended exposure to hot engine oil for material integrity verification |
| Thermal Cycle Test | 500+ hour thermal cycling for long-term reliability |
| Final Assembly Inspection | 100% visual and dimensional inspection before packaging |
Pre-Installation Checklist:
- Ensure engine is cool before starting work
- Clean area around vacuum pump and return hose
- Inspect vacuum pump outlet and crankcase return port for damage
- Verify new hose dimensions match original
- Use new hose clamps as recommended
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months
- Replacement: Immediately if failure symptoms appear
- Note: Critical safety component - proactive replacement recommended
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