Overview
The ZF 4699.170.171 MOTOR is a critical hydraulic drive component engineered for precise power delivery within ZF heavy-duty construction machinery transmissions. This OEM genuine part converts hydraulic pressure into mechanical rotational force, directly engaging the transmission’s internal gearing to facilitate smooth vehicle movement and load handling. Positioned within the valve body and clutch assembly interface, the 4699.170.171 motor regulates fluid flow to actuate gear shifts and maintain torque output under extreme operational stress. As a direct replacement unit, this SKU ensures factory-specified performance and longevity for demanding off-highway applications.
Symptoms of Failure
- Intermittent gear engagement failure: When the motor loses internal sealing integrity, the transmission may hesitate or fail to shift into gear, especially under load. This often manifests as a delayed response when moving from neutral to drive.
- Hydraulic fluid contamination: Worn internal seals or bearing degradation allow metal particles to enter the hydraulic circuit, causing erratic pressure drops and visible debris in the fluid filter.
- Audible whining or grinding noise: A failing motor produces high-pitched whining during operation, particularly at low RPM, indicating bearing wear or vane damage within the motor housing.
- Reduced machine travel speed: Loss of hydraulic motor efficiency results in slower acceleration and diminished top speed, often accompanied by increased engine RPM without proportional wheel or track movement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.170.171 |
| Type | Hydraulic Drive Motor |
| Material | High-strength cast iron housing with hardened steel internals |
| Weight | 4.2 kg (9.3 lbs) |
| Overall Length | 185 mm |
| Mounting Flange Diameter | 102 mm |
| Shaft Diameter | 22 mm (splined) |
| Operating Pressure Range | 20–250 bar |
| OEM Reference | ZF 4699.170.171 |
Compatibility
This motor is designed for integration with ZF’s WG series powershift transmissions commonly deployed in construction machinery. It is a direct fit for the WG180, WG200, and WG250 transmission models. Additionally, it is compatible with select ERGO series transmissions used in telescopic handlers and wheel loaders. Always verify your transmission model number and serial plate before ordering.
During installation, this motor works in concert with several adjacent components. The 4699025066 GP25 gear pump supplies the primary hydraulic flow, while the 4699101071 HOUSING encloses the motor assembly. The 4699102106 INPUT shaft transfers rotational energy from the motor into the transmission, and the 4699103104 OUTPUT flange connects to the driveline. Proper sealing is ensured by the 0634801038 SEALING RING and 0631302212 CYLINDRICAL PIN for alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025066 | GP25 | Hydraulic gear pump supplying fluid to motor |
| 4699101071 | HOUSING | Enclosure for motor and valve assembly |
| 4699102106 | INPUT | Shaft transferring motor torque to transmission |
| 4699103104 | OUTPUT | Flange connecting to driveline components |
| 4699109043 | BRAKE PARTS | Friction and steel plates for parking brake |
| 4699301145 | HOUSING | Secondary housing for clutch pack |
| 4699309085 | HOUSING COVER | Sealing cover for transmission housing |
| 0636101411 | CAP SCREW | Fastener for motor mounting flange |
| 0631302212 | CYLINDRICAL PIN | Alignment pin for precise assembly |
| 0634801038 | SEALING RING | O-ring preventing hydraulic fluid leaks |
