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The heart of a reliable cab tilting system is a powerful and durable pump drive. The WG9925820031/1 Electric Motor Assembly is the complete power unit for the hydraulic cabin lift system. This critical component is a fundamental part of genuine Sinotruk howo parts for cab operation. The WG9925820031/1 assembly combines a robust electric motor with an integrated hydraulic pump. It converts electrical energy into hydraulic pressure to smoothly raise and lower the truck cab. This ensures safe, controlled access to the engine compartment for maintenance and repairs.
Electric Motor Assembly Cabin Pump Drive
Сборочный узел электродвигателя привода насоса кабины
Conjunto del Motor Eléctrico de Accionamiento de la Bomba de la Cabina
The WG9925820031/1 assembly is the powerhouse of the cab tilting system. When the cabin lift switch is activated, it sends electrical power to this motor. The electric motor spins at high speed, driving the attached hydraulic gear or vane pump.
The pump draws hydraulic fluid from the reservoir and pressurizes it. This high-pressure fluid is then directed to the hydraulic tilt cylinders. The cylinders extend, smoothly lifting the multi-ton truck cab.
The WG9925820031/1 unit provides the necessary torque and flow rate. It must generate enough pressure to overcome the weight of the cab and its locking mechanism. Its reliable operation is essential for safe and efficient cab access.
High Torque & Reliable Lifting Power
Powerful, brush-type or permanent magnet DC motor delivers consistent torque to lift the cab smoothly, even in cold conditions or with minor system friction.
Robust, Sealed Construction
Housing protects internal components from dust, water, and under-chassis debris. Built to withstand vibration, temperature extremes, and exposure to road chemicals.
Integrated Pump for Compact Design
Motor and pump are assembled as a single, matched unit, ensuring optimal efficiency, eliminating alignment issues, and simplifying installation.
Direct OEM Replacement
Precise mounting points, electrical connector, and hydraulic ports ensure a perfect fit, replacing the entire failed unit without modification.
| Parameter / Feature | Specification / Description |
|---|---|
| OEM Part Number | WG9925820031/1 |
| Component Name | Electric Motor Assembly (Cabin Pump Drive) |
| Brand & Application | SINOTRUK Howo, complete drive unit for the hydraulic cab tilting system. |
| Primary Function | Convert electrical energy into hydraulic pressure to actuate cab lift cylinders. |
| Motor Type | High-torque DC electric motor (12V or 24V), typically brush-type for high starting torque. |
| Pump Type | Integrated hydraulic gear pump or vane pump. |
| Construction | Cast metal housing, sealed bearings, durable armature and brushes, integrated pump body. |
| Product Condition | New, 100% Genuine OEM Part. Complete assembly ready for installation. |
The cab tilt system is a closed-loop electro-hydraulic circuit. The WG9925820031/1 assembly is its prime mover. When the driver presses the lift switch, a heavy-duty relay closes. This sends high-current battery power to the motor terminals.
The motor’s armature spins, directly driving the pump’s internal gears. The pump creates a flow of hydraulic oil from the reservoir. This pressurized oil travels through hoses to the double-acting tilt cylinders.
The cylinders extend, pivoting the cab on its front mounts. A directional control valve (often solenoid-operated) determines raise/lower. The WG9925820031/1 runs only as long as the switch is held, providing control.
The system includes a pressure relief valve for safety. It prevents over-pressurization if the cab hits an obstacle. The entire circuit’s performance hinges on the reliability of the WG9925820031/1 motor-pump unit.
Slow or hesitant cab lifting is a primary symptom. The WG9925820031/1 motor may lack power due to worn brushes or internal shorts. Complete failure to operate is common—pressing the switch yields no sound from the motor.
Unusual noises during operation indicate trouble. A grinding sound suggests bearing failure. A high-pitched whine or straining noise may point to a worn pump or excessive internal resistance.
Intermittent operation is often electrical. Overheating of the motor housing is a serious sign. It can be caused by excessive load, low voltage, or internal faults. Visible fluid leaks from the pump housing seal are a clear failure.
A blown fuse or tripped circuit breaker that repeats after replacement strongly points to a short circuit inside the WG9925820031/1 motor. Any of these symptoms require immediate diagnosis and likely replacement.
Replacing the motor assembly requires care for electrical and hydraulic safety. First, disconnect the negative battery terminal. Safely support the cab in the tilted position if the old unit is completely failed.
Place a drain pan underneath. Disconnect the electrical connector from the old WG9925820031/1 assembly. Using line wrenches, carefully disconnect the hydraulic pressure and return lines. Cap the lines to prevent contamination.
Remove the mounting bolts and lift out the old unit. Install the new WG9925820031/1 assembly and secure it. Reconnect the hydraulic lines with new seals if provided. Reconnect the electrical connector.
Refill the hydraulic reservoir with the correct fluid. Reconnect the battery and operate the switch in short bursts to bleed air from the system. Check for leaks and ensure the cab operates smoothly through its full range.
The WG9925820031/1 motor is a high-current device. It requires a healthy battery and clean, tight connections. Voltage drop at the motor terminals due to corroded wires can cause poor performance and overheating.
Diagnosing a suspected failure involves checking power and ground at the motor connector while the switch is activated. Use a multimeter to verify full system voltage (12V or 24V). No voltage indicates a problem upstream (fuse, relay, switch).
If voltage is present but the motor doesn’t run, the WG9925820031/1 is likely faulty. A motor that draws excessive current (measured with a clamp meter) indicates internal shorts or mechanical binding. Always check the hydraulic fluid level and system for binding first.
The genuine WG9925820031/1 is designed to operate within the specified vehicle electrical parameters. Using a non-OEM unit with different resistance can overload relays and wiring. Correct diagnosis saves time and money.
The motor and pump in the WG9925820031/1 are engineered as a matched set. The motor’s speed-torque characteristics are perfectly suited to the pump’s displacement and required pressure. This ensures optimal efficiency and prevents stalling or overload.
Replacing only the motor or only the pump separately can lead to mismatched performance. An underpowered motor will overheat; an overpowered one may damage the pump. The integrated OEM assembly guarantees balanced performance.
The pump’s internal tolerances are precise. It must generate sufficient flow at the motor’s operating speed to lift the cab at a reasonable rate. The genuine WG9925820031/1 delivers this designed performance consistently.
This integration also simplifies inventory and repair. Instead of stocking separate motors and pumps, a single WG9925820031/1 assembly resolves most drive-unit failures. It is the most efficient repair strategy.
A functional cab tilt system is non-negotiable for efficient fleet maintenance. When the WG9925820031/1 fails, mechanics cannot access the engine for routine service or repairs. This leads to immediate vehicle downtime.
Keeping a spare WG9925820031/1 assembly in critical fleet inventory is a smart business decision. It allows for a quick swap, getting the truck back into service rapidly. The cost of downtime far exceeds the part’s price.
Training technicians on the signs of impending failure can allow for planned replacement during scheduled maintenance. This avoids unexpected breakdowns. Using only genuine parts like WG9925820031/1 ensures predictable service life.
A reliable cab lift system, powered by a genuine WG9925820031/1, supports a proactive maintenance culture. It ensures engines are serviced on time, preventing more costly failures. It is a key component in fleet operational readiness.
The Electric Motor Assembly for the Cabin Pump Drive, part number WG9925820031/1, is the indispensable powerhouse of the SINOTRUK Howo’s tilting system. Its reliable conversion of electrical energy into precise hydraulic force is fundamental for safe engine access and efficient vehicle maintenance.
Ensure dependable cab operation and minimize costly downtime by choosing the genuine WG9925820031/1 assembly. It guarantees the correct torque, flow rate, sealed construction, and perfect integration required for heavy-duty service. Trust only authentic OEM electro-hydraulic components for all your cab system repairs.
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