Overview
The ZF 4699.170.088 MOTOR is a critical hydraulic drive component engineered for demanding construction machinery transmissions. This OEM genuine part converts hydraulic pressure into mechanical rotational force, directly engaging the transmission’s internal clutch packs and gear sets. Positioned within the valve body assembly of ZF power shift transmissions, the 4699.170.088 motor ensures precise modulation of torque flow during load cycles. The SKU 4699.170.088 is manufactured to exact ZF tolerances, guaranteeing seamless integration with adjacent housing units such as the 4699101046 HOUSING and the 4699301109 HOUSING. Without this motor, the transmission cannot achieve proper gear engagement, making it indispensable for excavators, wheel loaders, and graders operating in heavy-duty environments.
Symptoms of Failure
- Intermittent gear slipping under load: A worn 4699.170.088 motor fails to maintain consistent hydraulic pressure, causing the transmission to slip when moving heavy materials or climbing grades.
- Delayed or harsh shifting: Operators may notice a lag between shifting commands and actual gear changes, often accompanied by jarring engagement due to insufficient motor response.
- Hydraulic oil contamination: Internal seal degradation within the motor allows debris to circulate, leading to dark, gritty oil and potential damage to the 4699301017 BEARING COVER and adjacent valve components.
- Audible whining or grinding: A failing motor produces high-pitched noises from the transmission housing, particularly during cold starts or low-speed maneuvering.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.170.088 |
| Type | Hydraulic Drive Motor |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 2.8 kg (6.2 lbs) |
| Operating Pressure | 25–35 bar (360–510 psi) |
| OEM Reference | ZF 4699.170.088 |
| Mounting Bolt Torque | 45 Nm (33 ft-lbs) |
| Seal Type | NBR O-Ring / PTFE Backup |
Compatibility
This motor is engineered for ZF power shift transmissions commonly used in construction machinery. It is directly compatible with the WG180, WG200, and WG211 series, as well as the 4WG-200 and 6WG-200 variants. The 4699.170.088 motor interfaces with the 4699301085 COVER and the main housing assembly to form a sealed hydraulic circuit. Always verify your transmission model’s serial number before ordering, as minor revisions exist between early and late production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Encloses the motor and distributes hydraulic fluid |
| 4699301109 | HOUSING | Secondary housing for valve body integration |
| 4699301017 | BEARING COVER | Protects motor bearings from debris ingress |
| 4699301085 | COVER | Seals the motor cavity and retains lubrication |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303141 | O-RING | Creates hydraulic seal between motor and housing |
| 0734307407 | PROTECTION CAP | Covers motor ports during storage |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along the motor shaft |
| 0637885612 | BREATHER | Equalizes pressure inside the transmission housing |
| 0636102023 | CAP SCREW | Secures the motor to the mounting flange |
