HOWO Power Steering Gearbox

Description：The premium original equipment power steering (OEM) WG9925477132 for Sinotruk Howo trucks ensures smooth, precise, and responsive steering for Howo A7, T5G, T7H, 371hp, and 420hp heavy-duty trucks. It features reinforced gears, optimized hydraulic power assist, and leak-proof seals for long-lasting durability even under heavy loads and harsh conditions.

Product model：WG9925477132

Category ：Chassis System

Update time：2025-11-24

Product Overview

The WG9925477132 power steering assembly is one of the core components of the steering system in Sinotruk's HOWO series heavy-duty trucks. Manufactured using high-strength alloy steel and precision gear machining technology, it boasts high torque capacity and excellent structural strength, maintaining excellent performance under long-term high-load conditions. This steering system features an optimized hydraulic power assist design, significantly reducing steering wheel operating resistance. This allows the vehicle to maintain smooth and controllable steering performance under heavy loads, long-distance transportation, and complex road conditions, reducing driver fatigue and improving overall driving safety. The WG9925477132 has a standardized interface and precise installation dimensions, directly compatible with multiple models including the HOWO A7, T5G, T7H, HOWO 371, and HOWO 420, offering convenient installation and high compatibility.

Technical Specifications

Item	Specification
Applicable Models	HOWO A7 / T5G / T7H / HOWO 371 / HOWO 420 / Sinotruk 4×2, 6×4, 8×4 Platforms
Part Number	WG9925477132
Rated Working Pressure	14–16 MPa (Industry Standard)
Maximum Working Pressure	18–20 MPa
Maximum Output Torque	≥ 1300–1500 N·m
Steering Ratio	22:1 – 24:1
Hydraulic Fluid Type	Sinotruk Hydraulic Power Steering Oil / ISO VG 46
Input Shaft Spline	36 × 1.5 mm (Common HOWO Standard)
Inlet Port Thread	M18 × 1.5
Outlet Port Thread	M20 × 1.5
Return Port Thread	M22 × 1.5
Mounting Hole Distance	185–190 mm (HOWO Standard)
Mounting Type	Side Mount
Net Weight	31–34 kg
Material	High-Strength Alloy Steel + Reinforced Gear Steel
Surface Treatment	Anti-Corrosion Coating / Precision Machining
Applicable System	Steering System

Advantages Summary

OEM Original Quality: Perfect replacement for WG9925477132, no adjustment required

High Pressure Resistance: Adaptable to high-load transportation and complex road conditions

Precision Gear Design: Light steering and sensitive response

Wear and Corrosion Resistance: Long lifespan and low maintenance costs

Wide Compatibility: Directly installable on multiple HOWO vehicle models

Product Features

High-Strength Alloy Steel Housing Structure:

Constructed from heavy-duty materials, it boasts excellent impact resistance and torsional strength, maintaining stable performance in complex road conditions and high-load operating environments.

Precision-Machinered Gear Mechanism:

Utilizing CNC-machined gear sets, it achieves high meshing precision and strong transmission efficiency, effectively reducing steering resistance and improving overall steering sensitivity.

Optimized Hydraulic Power Steering System:

The internal power steering oil passages are rationally designed, resulting in rapid power steering response and lighter steering wheel operation, significantly reducing driver fatigue during long driving sessions.

Reinforced Sealing Structure for Leak Prevention:

Employing high-pressure resistant oil seals and a multi-layer sealing structure, it effectively reduces the risk of hydraulic oil leakage, improving system stability and durability.

Wear-Resistant Key Components:

Key components such as the hydraulic valve body and gear pairs undergo wear-resistant treatment, significantly extending product lifespan.

High-Compatibility Installation Interface:

Installation dimensions strictly conform to the original equipment manufacturer's (OE) standards, directly replacing WG9925477132, ensuring immediate use without additional adjustments.

Compatible with multiple HOWO vehicle platforms:

Adapted to mainstream models such as HOWO A7, T5G, T7H, 371HP, and 420HP, offering strong applicability and wide application in repair and after-sales replacement.

Recommend Products