Overview
The ZF 4699.170.274 MOTOR is a critical hydraulic drive component engineered for use in heavy-duty construction machinery transmissions. This OEM genuine part converts hydraulic pressure into mechanical rotational force, directly engaging the transmission’s gear train to control vehicle movement and torque output. Positioned within the valve body assembly of select ZF power shift transmissions, the motor regulates fluid flow to the clutch packs and planetary gears. The SKU 4699.170.274 is precision-machined to OEM tolerances, ensuring seamless integration with the 4699101153: HOUSING and the 4699102106: INPUT shaft assembly. Without this motor, the transmission cannot modulate gear engagement, leading to total drivetrain failure.
Symptoms of Failure
- Erratic gear engagement or slipping: A worn motor fails to maintain consistent hydraulic pressure, causing the transmission to slip between gears or hesitate during shifts. This is a common symptom when the internal rotor or seal degrades.
- Hydraulic fluid leaks near the valve body: Cracks or seal wear on the motor housing allow pressurized oil to escape, leaving visible puddles under the equipment. Search queries like “ZF transmission motor leaking oil” often point to this part.
- Delayed or no forward/reverse response: When the motor cannot generate sufficient torque, the machine may stall or refuse to move, especially under load. This failure mimics a dead pump or clogged filter.
- Unusual whining or grinding noises: Metal-on-metal contact inside a failing motor produces high-pitched sounds during operation, indicating imminent catastrophic failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4699.170.274 |
| Type | Hydraulic Drive Motor |
| Material | High-strength cast iron body, hardened steel rotor |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Overall Length | 185 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm spacing |
| OEM Reference | ZF 4699.170.274 |
| Seal Type | Nitrile rubber O-ring (included) |
| Operating Pressure | Up to 25 bar (360 psi) |
Compatibility
This motor is designed for ZF power shift transmissions commonly found in construction machinery, including wheel loaders, dozers, and telehandlers. It is a direct fit for the WG180 and WG200 series transmissions, as well as the 4WG-200 and 6WG-200 variants. The part also integrates with the 4699103122: OUTPUT shaft and the 4699025163: GP25 gear pump assembly. Always verify your transmission model tag before ordering; cross-reference with the 4699109111: BRAKE PARTS kit for complete overhaul compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025163 | GP25 | Gear pump for hydraulic fluid supply |
| 4699101153 | HOUSING | Encloses the motor and valve assembly |
| 4699102106 | INPUT | Input shaft transferring torque from motor |
| 4699103122 | OUTPUT | Output shaft to final drive |
| 4699109111 | BRAKE PARTS | Brake disc and piston kit |
| 4699301250 | HOUSING | Secondary housing for clutch pack |
| 4699309121 | HOUSING COVER | Seals the transmission housing |
| 0636101411 | CAP SCREW | M10 bolt for motor mounting |
| 0631302072 | CYLINDRICAL PIN | Alignment pin for housing |
| 0636302013 | SCREW PLUG | Oil drain plug |
