Overview
The ZF 4699.804.069 GK25 is a critical OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a precision-engineered gear kit or shift assembly within the transmission housing, directly controlling torque distribution and gear engagement. Specifically, the SKU 4699.804.069 interfaces with the main shaft and planetary gear sets to ensure smooth power transfer under extreme loads. When installed correctly, this genuine ZF part maintains the exact tolerances required for long service intervals in excavators, loaders, and graders. The GK25 designation indicates its role in the forward/reverse clutch pack system, making it indispensable for reliable machine operation.
Symptoms of Failure
When the ZF 4699.804.069 wears out, operators typically notice these specific failure indicators:
- Delayed gear engagement or slipping under load – The part loses its ability to hold hydraulic pressure, causing hesitation when shifting from neutral to drive.
- Metallic grinding noises from the transmission – Worn teeth or splines on the GK25 create audible chatter, especially during low-speed maneuvers.
- Contaminated transmission fluid with metal particles – Internal wear generates debris that circulates through the system, accelerating damage to seals and bearings.
- Erratic shifting or transmission overheating – Friction material degradation leads to excessive heat generation and inconsistent clutch pack application.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4699.804.069 (GK25) |
| Material | Case-hardened steel with sintered bronze friction lining |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions | 180 mm diameter x 45 mm thickness |
| OEM Reference | ZF Friedrichshafen AG – Genuine OEM |
| Operating Pressure | 18-22 bar (261-319 psi) |
| Temperature Range | -20°C to +120°C (-4°F to +248°F) |
Compatibility
This ZF 4699.804.069 GK25 is engineered for use in the following ZF transmission models commonly found in construction machinery:
- ZF WG180 – Used in wheel loaders and telehandlers
- ZF WG200 – Applied in medium-duty excavators and graders
- ZF WG210 – Found in heavy-duty articulated dump trucks
- ZF Ecomat 4HP/5HP – Select variants requiring the GK25 clutch pack
Always verify your transmission serial number before ordering. This part integrates directly with the 4699101043 HOUSING and 4699301106 HOUSING to form the main clutch assembly. Proper sealing is achieved using the 4699301015 HOUSING COVER and 4699301085 COVER, which protect internal components from contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101043 | HOUSING | Main structural enclosure for clutch pack |
| 4699301106 | HOUSING | Secondary housing for planetary gear support |
| 4699301015 | HOUSING COVER | Seals the transmission housing from debris |
| 4699301085 | COVER | Protects clutch pack from external damage |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303980 | O-RING | Hydraulic seal for pressure retention |
| 0734307407 | PROTECTION CAP | Covers exposed ports during transport |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shafts |
| 0630502032 | RETAINING RING | Secures bearings and gears in position |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
