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HM-3904 | Hose Assembly Nonmetallic Steering Gear to Hydroboost HMMWV
Precio habitual
€105,00 EUR
Precio habitual
Precio de oferta
€105,00 EUR
Precio unitario
por
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NSN #:4720-01-558-7665Part #:12506992, RCSK23646
Hose Assembly Nonmetallic Steering Gear to Hydroboost HMMWV
- Length: approx. 22 in.
- 8mm (5/16")
- 15.5 MPa
- 155 Bar
- SAE 100R5 / Dot FMVSS 106 AII
- J1402 Air Brake
- Item #19 in diagram
Fits: 1 1/4 Ton Military Truck HMMWV
M1025 M1025A1 M1025A2 M1026 M1026A1 M1035 M1035A1 M1035A2 M1037 M1038 M1038A1 M1042 M1043 M1043A1 M1043A2 M1044 M1044A1 M1045 M1045A1 M1045A2 M1046 M1046A1 M1097 M1097A1 M1097A2 M1121 M1123 M966 M966A1 M996 M996A1 M997 M997A1 M997A2 M998 M998A1 M1151 M1151A1 M1167
Component Overview & Function
The HMMWV Nonmetallic Steering Gear to Hydroboost Hose Assembly (NSN 4720-01-558-7665, Part 12506992 / RCSK23646) is a critical high-pressure hydraulic line used in modern 12K / A2 / M1100 series HMMWV variants.
Unlike civilian vehicles that use a vacuum-assisted brake booster, the HMMWV utilizes a hydroboost system that relies on hydraulic pressure generated by the power steering pump to provide power-assisted braking. This specific nonmetallic hose assembly forms the vital link connecting the power steering gear box (specifically Sheppard systems on newer models) directly to the hydraulic brake hydroboost booster.
Technical Specifications
- Core Purpose: Transmits high-pressure hydraulic fluid to simultaneously ensure smooth steering response and reliable braking power assist.
- Operating Limits: Engineered to withstand a working pressure of 15.5 MPa (155 Bar / 2,250 PSI).
- Material Compliance: Constructed from heavy-duty, reinforced nonmetallic synthetic rubber compliant with SAE 100R5 and DOT FMVSS 106 AII safety standards.
- Dimensions: Measures approximately 22 inches in length with an 8mm (5/16-inch) inner diameter.
- Application Fitment: Standard on late-model HMMWV variants with truck serial numbers 246890 and above.
Signs You Need a New Hose Assembly
Because this hose operates under extreme hydraulic pressure and handles both steering and braking safety mechanisms, regular inspection is critical. You need to replace this assembly if you encounter any of the following symptoms:
- Fluid Leaks and Wetness: Hydraulic fluid dampness or active dripping near the crimped metal fittings, or along the flexible body of the hose.
- Degraded Braking Performance: A hard or stiff brake pedal, or a noticeable delay in braking assist, which indicates pressure loss between the steering gear and the booster.
- Heavy or Stiff Steering: Increased physical effort required to turn the steering wheel, especially at low speeds or when simultaneously applying the brakes.
- Visible Physical Damage: Any signs of dry rotting, cracking, outer jacket abrasion, kinked lines, or bubbling along the rubber section of the hose.
- Aerated Fluid or Noise: A whining or groaning noise coming from the power steering pump, often caused by the hose drawing air into the closed hydraulic loop through microscopic tears.
