Overview
The ZF 4699.170.219 MOTOR is a critical hydraulic drive component engineered for ZF powershift transmissions used in heavy construction machinery. This OEM genuine part converts hydraulic pressure into mechanical torque to engage clutch packs and shift gears within the transmission housing. Positioned directly on the valve body or clutch housing assembly, the motor ensures precise oil flow control for smooth gear engagement. The SKU 4699.170.219 is a direct replacement unit that matches original factory specifications, eliminating guesswork during rebuilds. When paired with the 4699025040 GP25 and the 4699101114 HOUSING, this motor forms the core actuation system for loaders, graders, and excavators.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn motor cannot build adequate hydraulic pressure, causing hesitation or clunking when shifting from neutral to drive. This is a common “ZF transmission slow to engage” issue.
- Intermittent loss of forward or reverse: Internal seal degradation leads to pressure drops, resulting in sudden loss of drive direction under load—often reported as “transmission drops out of gear while digging.”
- Hydraulic oil contamination: Metal particles from a failing motor rotor or bushing appear in the oil filter or sump magnet, signaling imminent failure. This is a key indicator for “ZF transmission metal shavings in oil” searches.
- Whining or grinding noise from transmission: Cavitation or bearing wear inside the motor produces a high-pitched whine that changes with engine RPM, distinct from normal gear noise.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.170.219 |
| Type | Hydraulic Drive Motor |
| Material | High-strength cast iron body with hardened steel rotor |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Overall Length | 185 mm |
| Mounting Flange Diameter | 102 mm |
| Spline Count | 14-tooth internal spline |
| OEM Reference | ZF 4699.170.219 |
| Operating Pressure | 18–25 bar (260–360 psi) |
Compatibility
This motor is designed for ZF WG-series powershift transmissions commonly found in construction machinery. It is a direct fit for the WG180, WG200, and WG211 models. The part also integrates with the 4699102157 INPUT shaft assembly and the 4699103114 OUTPUT flange in these transmissions. Always verify your transmission serial number against ZF application guides before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025040 | GP25 | Gear pump providing hydraulic flow to the motor |
| 4699101114 | HOUSING | Main housing enclosing the motor and valve body |
| 4699102157 | INPUT | Input shaft transferring torque from motor to clutch pack |
| 4699103114 | OUTPUT | Output flange connecting to driveline |
| 4699109068 | BRAKE PARTS | Brake components for parking/holding functions |
| 4699301202 | HOUSING | Secondary housing for clutch assembly |
| 4699309205 | HOUSING COVER | Cover plate sealing the housing |
| 0636101477 | CAP SCREW | Fastener for motor mounting |
| 0631302221 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0501319149 | SCREW PLUG | Plug for hydraulic port sealing |
