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SINOTRUK HOWO Truck Spare Parts Power Steering Pump WG9725478037/2
| Parameter | Value / Description |
|---|---|
| Application | Heavy-duty trucks – specifically designed for Sinotruk HOWO A7, T7, T7h series |
| Function | High-performance, gear-driven hydraulic pump that converts engine mechanical energy into hydraulic pressure to assist steering operation |
| Drive Type | Belt-driven (engine-driven via pulley system) |
| Displacement | 21.0 mL/rev (milliliters per revolution) |
| Flow Rate (Controlled Flow) | 20.0 L/min (liters per minute) |
| Maximum Pressure | 16 MPa (2320 PSI) or up to 18 MPa (2610 PSI), depending on operating conditions and model variant |
| Operating Speed Range | 500 – 4000 RPM (synchronized with engine speed) |
| Rotation Direction | Right-hand rotation (as viewed from the drive end) – critical for correct installation |
| Material | Steel construction for high durability under harsh working conditions |
| Weight | Approximately 11 kg |
| Inlet Port Thread | M26x1.5 |
| Outlet Port Thread | M18x1.5 |
| Mounting Type | Bracket-mounted with belt tension adjustment capability |
| Performance | Provides smooth, responsive steering assistance; reduces driver effort, especially during low-speed maneuvers and heavy-load operations |
| Quality Standard | OE (Original Equipment) matching quality; often supplied as genuine replacement part |
| Warranty | Typically backed by a 12-month manufacturer warranty |
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This power steering pump is primarily used in the following Sinotruk (SINOTRUK) heavy-duty truck models:
HOWO A7 Series Trucks
T7 Series Trucks
T7H Series Trucks
Steyr-based Models (some variants derived from Steyr technology)
Golden Prince Series
Other compatible HOWO-series commercial vehicles using the same hydraulic steering system
✅ Note: Due to shared platform design across Sinotruk’s heavy truck lineup, this part may also fit other models based on the HOWO architecture.
| Brand/System | Part Number(s) |
|---|---|
| Sinotruk / CNHTC | WG9725478037/2, WG9725478037-2 |
| ZF TRW | May correspond to ZF servomotor types used in heavy trucks (model-specific match required) |
| Bosch Rexroth | Gear pump equivalents available (e.g., similar displacement and pressure rating) |
| Aftermarket Brands | Various suppliers offer compatible versions under different branding (verify specs before substitution) |
⚠️ Always confirm interchangeability using VIN or chassis-specific lookup tools when replacing with non-OEM parts.
Hydraulic Fluid Compatibility
ZF TE-ML 09
ATF-based synthetic blend (OEM-approved)
Or equivalent heavy-duty power steering fluid meeting DIN 75202 or ISO 7308 standards
Use only manufacturer-recommended fluids such as:
❌ Avoid generic or unapproved oils — they can cause seal degradation, internal wear, and noise.
Fluid Level Inspection
Check reservoir level weekly or before long-haul trips.
Ensure oil level stays between MIN and MAX marks.
Low fluid causes foaming, cavitation, increased noise, and potential pump failure.
Regular Fluid Replacement
Replace power steering fluid every 30,000 miles (approx. 48,000 km) or every 2 years, whichever comes first.
Fresh fluid removes contaminants, restores lubricity, and prevents sludge buildup.
Drive Belt Tension & Alignment
Squealing noises
Vibration
Reduced pump efficiency
Premature bearing failure
Maintain proper belt tension: 8–12 mm deflection under moderate thumb pressure (on longest span).
Misaligned or worn belts lead to:
System Cleanliness During Installation
Keep all ports sealed until mounting.
Flush lines if replacing a failed pump to prevent debris from damaging the new unit.
Use clean, lint-free cloths and avoid introducing dirt, metal shavings, or moisture into the system.
Avoid Dry Running
Never start the engine with an empty or improperly filled power steering system.
Prime the pump before initial startup to prevent air lock and damage.
Monitor for Noise & Performance Issues
Air in the system
Worn pump
Contaminated fluid
Low pressure
Whining, groaning, or stiff steering may indicate:
Bleed the system after maintenance and recheck performance.
Environmental Conditions
Suitable for extreme temperatures (-30°C to +90°C ambient).
Use appropriate viscosity fluid for cold climates to ensure cold-start protection.
Designed specifically for Sinotruk’s flagship heavy-duty trucks
Delivers reliable, powerful steering assist even under full load
Built with durable steel components for long service life
Matches original equipment performance and dimensions
Backed by warranty and widely supported in global aftermarket networks
