The WG9725470088 Power Cylinder is a cornerstone of the Sinotruk HOWO steering assembly. It acts as the primary hydraulic actuator that converts fluid pressure into the mechanical force required to turn heavy-duty front axles under full load.
As a frequently requested Sinotruk spare part, our WG9725470088 is manufactured using high-strength seamless steel tubing and features reinforced piston seals to prevent internal bypass—a common cause of “heavy steering” in older HOWO models. Whether you are navigating construction sites or long-haul highways, this cylinder ensures a responsive and stable steering feel.
Technical Specifications:
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Part Number: WG9725470088
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Category: Sinotruk Spare Parts / Steering System
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Application: Sinotruk HOWO 336/371/420, HOWO A7, HOHAN
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Cylinder Bore: 90mm (Standard Precision)
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Operating Pressure: Up to 150 Bar
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Seal Material: High-temp Resistant Fluororubber (Viton equivalent)
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Weight: 14.5 kg
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Compatible Fluid: ATF Dexron III or dedicated Hydraulic Steering Oil
Pro-Installation Guide for WG9725470088:
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System Flush: Before installing the new Sinotruk spare part, completely flush the steering hydraulic circuit. Old metal shavings or contaminated oil will ruin the seals of your new WG9725470088 within days.
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Bleeding the Air: Once the cylinder is mounted, fill the reservoir and cycle the steering wheel from lock-to-lock at least 10 times with the engine off (wheels off the ground). This prevents cavitation and “shuddering” when you first start the engine.
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Check the Ball Joints: Inspect the drag link and tie-rod ends connected to the cylinder. A stiff or seized ball joint will put excessive lateral stress on the cylinder rod, leading to premature leaks.
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Hose Torque: Use a backup wrench when tightening the hydraulic lines. Over-torquing the fittings can crack the cylinder port housing.
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Alignment Post-Install: Since you are replacing a steering actuator, a quick check of the “toe-in” alignment is highly recommended to ensure even tire wear
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