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The WG2203240009 (also identified as AZ2222240002) oil pump is the core component responsible for circulating gear oil through the main and auxiliary shafts of Sinotruk HOWO HW-series transmissions.
Engineered for the high-torque demands of the HOWO A7 and T7H series, this pump ensures that even under heavy loads and steep inclines, every gear and bearing receives consistent lubrication. Made from high-strength cast alloy, it is designed to resist thermal deformation and maintain stable pressure throughout the long haul. Using this genuine Sinotruk HOWO part is the best insurance against expensive transmission overhauls caused by oil starvation.
Technical Specifications:
Part Numbers: WG2203240009 / AZ2222240002 (Interchangeable)
Compatible Gearboxes: HW13710, HW15710, HW19710, HW19712, HW20716, etc.
Material: Reinforced Cast Iron Body / Precision Ground Steel Gears
Flow Rate: Calibrated to OEM standard for high-speed lubrication
Mounting Type: Direct Internal Transmission Fitment
Weight: 2.45 kg
Operating Temperature: Rated for high-temp gear oil environments (up to 120°C)
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Replacing a gearbox oil pump requires attention to detail. Our technical team suggests the following steps to ensure a perfect fit:
Inspect the Drive Gear: Before installing the new WG2203240009, check the teeth on the transmission's internal drive gear. A worn drive gear will quickly damage a new pump.
Prime the Pump: Do not install the pump "dry." We recommend pouring a small amount of clean gear oil into the pump inlet and rotating the gear by hand to ensure the internal seals are lubricated before the first startup.
Seal Verification: Ensure the mounting surface is completely clean of old gasket residue. Use the correct OEM O-rings or gaskets to prevent internal pressure loss—even a tiny leak can drop your oil pressure significantly.
Final Flush: If the previous pump failed due to metal shavings, it is mandatory to flush the entire gearbox oil circuit and replace the oil filter before installing this new unit.
