Overview
The ZF 4699.170.185 MOTOR is a critical hydraulic drive component within the power take-off (PTO) assembly of heavy-duty construction machinery transmissions. This OEM genuine part converts hydraulic pressure into mechanical torque to actuate auxiliary systems such as cooling fans, hydraulic pumps, or winch drives. Positioned on the transmission housing, it interfaces directly with the gear train to provide reliable power output under extreme load conditions. The SKU 4699.170.185 is engineered to ZF’s exacting tolerances, ensuring seamless integration with the transmission’s internal lubrication and control circuits. When paired with the 4699003082 GK20 gear kit, this motor delivers consistent performance in demanding environments like excavators and wheel loaders.
Symptoms of Failure
- Hydraulic motor oil leaks around the shaft seal: Visible drips or wetness near the motor mounting flange indicate seal degradation, often accompanied by a drop in hydraulic fluid levels.
- Intermittent or complete loss of auxiliary power: The motor fails to engage or slips under load, causing erratic operation of attached equipment like cooling fans or pumps.
- Unusual whining or grinding noises during operation: Worn internal bearings or scored pistons produce audible distress signals, especially when the motor is under high torque.
- Overheating of the transmission housing near the motor mount: Excessive friction from a failing motor generates localized heat, which can be detected by infrared thermography during inspection.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.170.185 |
| Type | Hydraulic Motor (Gerotor/Geroller) |
| Displacement | 28.3 cc/rev (estimated) |
| Maximum Pressure | 250 bar (3,625 psi) |
| Maximum Speed | 3,000 RPM |
| Mounting Flange | SAE A 2-Bolt (82.55 mm pilot) |
| Shaft Type | Straight Keyed (19 mm diameter) |
| Housing Material | High-strength aluminum alloy |
| Seal Material | Nitrile rubber (NBR) with PTFE backup |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4699.170.185 |
Compatibility
This motor is designed for use in ZF WG series transmissions commonly found in construction machinery. It is compatible with the following transmission models:
- ZF WG180 – Used in wheel loaders and telehandlers
- ZF WG200 – Applied in medium-duty excavators and graders
- ZF WG210 – Found in heavy-duty dump trucks and compactors
- ZF WG250 – Integrated into large mining and quarry equipment
For proper installation, ensure the 4699101097 HOUSING is free of debris and the 4699102166 INPUT shaft is aligned correctly. The 4699103060 OUTPUT coupling must also be inspected for wear to prevent premature failure of the motor.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699003082 | GK20 | Gear kit for torque transfer |
| 4699101097 | HOUSING | Encloses motor assembly |
| 4699102166 | INPUT | Input shaft for power entry |
| 4699103060 | OUTPUT | Output coupling for load connection |
| 4699105010 | TURNTABLE BEARING | Rotary support for heavy loads |
| 4699301183 | HOUSING | Secondary housing for gear train |
| 4699301017 | BEARING COVER | Protects bearing from contamination |
| 4699301085 | COVER | Seals transmission cavity |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303141 | O-RING | Hydraulic seal for fluid integrity |
