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4937729 Cumins Hydraulic Power Steering Pump for Engine B3.9 B5.9 Series Sinotruk HOWO Engine Part Truck Parts Sitrak Shacman FAW Foton Dongfeng
Product Name: Power Steering Pump
Part Number: 4937729
Product Model: Sinotruk
Product After Sales Service: 3 Months
Product Material: Steel
Product Origin: JINAN
Product Unit: PCS
Product Advantages: high-density, good performance, long service life.
The power steering pump in a truck is a critical component of the hydraulic power steering (HPS) system, which assists the driver in turning the steering wheel with minimal effort. Below are its key functions:
The pump is driven by the engine (via a belt) and pressurizes power steering fluid, creating the necessary hydraulic force to assist steering.
It maintains a steady flow of high-pressure fluid to the steering gearbox or rack-and-pinion system.
Without the pump, turning heavy truck wheels (especially when stationary or at low speeds) would require significant physical force.
The pressurized fluid helps move the steering linkage, making maneuvers smoother.
The pump includes a pressure relief valve to prevent excessive pressure, protecting hoses and seals from damage.
It adjusts output based on engine speed (higher RPM = more pressure).
The circulating fluid lubricates internal components (e.g., gears, pistons) and dissipates heat, preventing wear.
Ensures quick and precise steering response, crucial for large vehicles like trucks and buses.
Whining or groaning noise when turning
Stiff or jerky steering
Fluid leaks (often near the pump or hoses)
Low fluid level or foamy/contaminated fluid
Vane-type pump (most common, uses rotating vanes to pressurize fluid)
Gear-type pump (older designs, less efficient)
Electric power steering (EPS) (in modern trucks, replaces hydraulic pumps with electric motors)
Without a functioning power steering pump, steering a heavy truck becomes extremely difficult, increasing driver fatigue and safety risks. Proper maintenance ensures smooth and reliable operation.
Shandong Tongjia Supply Chain Management Co., Ltd. was established in 2002, and in 2014, it set up a subsidiary Jinan Perfect Power Auto Parts Co. specializes in the sale of heavy-duty trucks and truck parts. The company primarily focuses on distributing Sinotruk, Shacman, Foton truck parts, and various construction machinery components, offering over 200,000 distinct items. Shandong Tongjia emphasizes international trade, exporting goods to Africa, the Middle East, Southeast Asia, South America, Eastern Europe, and other global markets. The company has developed a dedicated and professional technical staff and sales team, establishing a comprehensive management system. Shandong Tongjia is committed to providing customers with high-quality and affordable products. Currently, its offerings are well-received both domestically and internationally, consistently earning praise from customers around the world.
We have worked with many of the world's leading brands,and almost all of our co-operators have been satisfied with our products and services,and have continued their co-operation for many years. We are looking forward to your enquiry,let's cooperate and win together !
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