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Shacman FAW Truck Spare Parts FAST Transmission Retarder FHB400 RetarderThe FHB400 is a parallel hydraulic retarder manufactured by Shaanxi Fast Gear Co., Ltd. (FAST), designed as an auxiliary braking system for heavy-duty commercial vehicles. It enhances vehicle safety during prolonged downhill descents by reducing reliance on service brakes, minimizing brake fade, and extending brake life.
| Parameter | Specification |
|---|---|
| Model Name | FHB400, FHB400A |
| Type | Parallel Hydraulic Retarder (Non-integral) |
| Mounting Style | Parallel to transmission output shaft (does not occupy PTO position) |
| Max Braking Torque | Up to 4000 Nm (depending on configuration and speed) |
| Max Input Power | Over 600 kW |
| Rated Speed (for Max Torque) | 1100 RPM input shaft speed |
| Max Input Speed | 2500 – 5000 RPM (varies by model/config) |
| Operating Medium | Special hydraulic oil (retarder-specific fluid) |
| Oil Capacity | Approx. 6.5 liters |
| Weight (Dry) | ~53 kg (lightweight aluminum alloy housing) |
| Electrical System | 24V DC control system |
| Cooling Method | Heat dissipated via engine cooling circuit |
| Thermal Management | Integrated heat exchanger with 360° rotatable water pipes for flexible plumbing |
| Lubrication System | Screw pump forced lubrication (ensures reliability at idle and high load) |
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✅ Compact & Lightweight: Aluminum construction reduces overall vehicle weight.
✅ Parallel Installation: Does not interfere with PTO or driveline layout; ideal for tight chassis spaces (e.g., buses, light-duty trucks).
✅ Low-Speed Efficiency: Maintains effective braking torque even at low vehicle speeds due to optimized rotor/stator design.
✅ Minimal Idle Loss: Rotor-stator disengagement in idle mode reduces parasitic power loss.
✅ High Thermal Stability: Efficient heat transfer through engine radiator prevents overheating under sustained use.
✅ Robust Reliability: Sealed unit with forced lubrication ensures long service life in harsh conditions.
| Brand | Models |
|---|---|
| SHACMAN (Shaanxi Auto) | X3000, X5000 series |
| SINOTRUK (CNHTC) | HOWO, SITRAK series |
| Foton Auman | Heavy-duty tractors & cargo trucks |
| Dongfeng Commercial Vehicle | DFAC, KX/KL series |
| FAW Jiefang | J6, J7 heavy-duty trucks |
Designed primarily for integration with:
FAST 12-speed manual transmissions
Compatible with Voith VR115 CT automated gearbox systems
Also retrofitted or original equipment on:
DAF XF, CF series (European heavy trucks)
Ford Heavy-Duty Trucks (certain export models)
Natural gas (CNG/LNG) powered National VI emission standard tractors
Long-haul coaches and intercity buses
Special-purpose vehicles: dump trucks, concrete mixers, mountain patrol vehicles
| Description | Model / Part Number |
|---|---|
| Main Unit Models | FHB400, FHB400A |
| Application-Specific Assemblies | |
| - For SHACMAN + FAST Transmissions | FHB400-SQ1, FHB400-SQ2, FHB400-SQ5 |
| - For Foton / SINOTRUK (HOWO) | FHB400-G23179, FHB400-G24178 |
| Controller (Retarder ECU) | SQBH1, H70000-FHB400-SQBH1, DZ93189585443 |
| Control Harness Assembly | FAST OEM harness kits (model varies by vehicle) |
| Common Aftermarket Reference | FH400 (universal reference code used by suppliers) |
| Seals & Gaskets Kit | FAST official spare part set (OEM-sealed packaging) |
Note: Always verify compatibility using VIN or transmission serial number when replacing.
⚠️ Critical Safety and Operation Notes:
| Warning / Tip | Explanation |
|---|---|
| ❌ Never Use in Neutral (N) | At idle (~800 RPM), coolant flow is insufficient. Using retarder causes rapid water temperature rise → automatic shutdown within seconds. |
| ✅ Minimum Engine Speed | Maintain ≥1500 RPM during constant-speed (cruise) braking to ensure proper cooling circulation. |
| ⚠️ Overheat Protection | System automatically disables if coolant/oil temperature exceeds safe threshold. Resume only after cooldown. |
| Emergency Braking | In non-slippery, straight-road emergencies, shift retarder directly to highest level. Provides instant high braking force (may trigger thermal cutoff after ~10–15 sec, but sufficient for critical deceleration). |
| Maintenance Schedule | |
| - Check for leaks (oil/water) monthly or every 10,000 km | |
| - Inspect mounting bolts and electrical connectors every 30,000–50,000 miles (48,000–80,000 km) | |
| - Replace oil per manufacturer schedule (typically every 120,000 km or 2 years) | |
| - Ensure heat exchanger and cooling lines are unobstructed |
Mounting Flexibility: Can be installed at various angles due to internal oil management design.
Coolant Plumbing: 360° rotatable inlet/outlet connectors simplify routing to engine cooling system.
Electrical Interface: Connects to vehicle CAN bus or standalone switch panel; integrates with dashboard warning lights.
Driver Controls: Typically operated via toggle switch or selector knob on steering column or console (multi-level settings: 1–4 or Low/Mid/High).
| Benefit | Impact |
|---|---|
| Extended Service Brake Life | Reduces wear on friction brakes by up to 60% on hilly routes |
| Improved Downhill Safety | Enables stable speed control without driver fatigue |
| Fuel Efficiency Gain | Less frequent braking → smoother driving → better fuel economy |
| Compliance Ready | Supports National VI / Euro VI emissions standards for CNG/diesel trucks |
| Cost-Effective Maintenance | Lower downtime and reduced maintenance costs over lifecycle |
