Overview
The ZF 4699.170.080 MOTOR is a critical hydraulic actuation component within the final drive assembly of heavy construction machinery. This OEM genuine part converts hydraulic pressure into mechanical torque to engage and disengage the transmission’s clutch packs. Positioned directly on the transmission housing, the motor interfaces with the valve body to control gear selection under high load conditions. The SKU 4699.170.080 is precision-machined to ZF’s exacting tolerances, ensuring consistent oil flow and pressure regulation. When this motor fails, the entire drivetrain’s shift quality degrades, leading to costly downtime on job sites.
Symptoms of Failure
- Delayed or erratic gear engagement – The motor struggles to build sufficient hydraulic pressure, causing a lag when shifting from neutral to forward or reverse. This is a common search query for “ZF transmission slow to engage.”
- Oil seepage around the motor housing – Worn seals on the 4699.170.080 allow hydraulic fluid to escape, leaving puddles under the machine. Operators often search for “ZF motor oil leak repair.”
- Transmission overheating – A failing motor forces the pump to work harder, raising fluid temperatures beyond normal operating ranges. This symptom is frequently searched as “construction transmission overheating causes.”
- Intermittent loss of drive power – The motor may momentarily fail to hold pressure, causing the transmission to slip under load, especially when climbing grades or lifting heavy materials.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.170.080 |
| Type | Hydraulic Drive Motor |
| Material | High-strength cast iron with hardened steel rotor |
| Weight | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 185 mm x 95 mm x 110 mm |
| Operating Pressure | 20–25 bar (290–363 psi) |
| OEM Reference | ZF 4699.170.080 (Genuine) |
| Seal Type | Nitrile rubber O-rings (compatible with Dexron III) |
Compatibility
This motor is engineered for ZF’s heavy-duty powershift transmissions commonly used in wheel loaders, dozers, and graders. It is a direct fit for the WG180, WG200, and WG250 series. Additionally, it is found in certain 4WG-200 and 6WG-200 variants. Always verify your transmission model tag before ordering. The 4699.170.080 replaces earlier revisions with the same mounting flange pattern and spline count.
During installation, the motor mounts directly to the 4699101044 HOUSING, which encloses the rotor assembly. The 4699301111 HOUSING provides the primary fluid channel, while the 4699301054 HOUSING COVER seals the motor cavity. A 4699301055 COVER protects the output shaft from debris ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101044 | HOUSING | Encloses motor rotor and stator assembly |
| 4699301111 | HOUSING | Primary fluid channel for hydraulic pressure |
| 4699301054 | HOUSING COVER | Seals motor cavity, prevents contamination |
| 4699301055 | COVER | Protects output shaft from debris |
| 4699301014 | THREAD PROTECTIVE SHIELD | Guards mounting threads during assembly |
| 0634303996 | O-RING | Seals fluid passages between housings |
| 0734307408 | PROTECTION CAP | Covers unused ports during transport |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shaft |
| 0630502032 | RETAINING RING | Secures bearings in axial position |
| 0637885612 | BREATHER | Equalizes internal pressure, vents moisture |
