Overview
The ZF 4699.805.042 GK30 is a precision-engineered component designed for the hydraulic control unit within heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 4699.805.042, functions as a critical valve or actuator element that modulates clutch pressure and oil flow in construction machinery drivetrains. It sits directly within the transmission valve body assembly, ensuring precise gear engagement and smooth power transfer under extreme loads. For optimal sealing and structural integrity, this part works in conjunction with the 4699101044 HOUSING and the 4699301111 HOUSING, which provide the necessary mounting and fluid routing channels.
Symptoms of Failure
When the ZF 4699.805.042 GK30 begins to degrade, operators will notice distinct performance issues. Common failure symptoms include:
- Delayed or harsh gear engagement – The transmission hesitates or slams into gear, especially when shifting from neutral to drive.
- Intermittent clutch slip under load – The engine revs increase without proportional vehicle speed, indicating pressure loss in the hydraulic circuit.
- Hydraulic oil leaks near the valve body – Visible seepage around the transmission housing, often traced back to a worn sealing surface on the GK30 unit.
- Erratic shifting patterns – The transmission hunts for gears or fails to hold a selected ratio during operation.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4699.805.042 (GK30) |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 35 mm |
| OEM Reference | ZF Friedrichshafen AG |
| Sealing Type | Integrated O-ring groove (compatible with 0634303996 O-RING) |
| Operating Pressure | Up to 25 bar (362 psi) |
Compatibility
This genuine ZF part is engineered for use in the following transmission models commonly found in construction machinery:
- ZF WG180
- ZF WG200
- ZF WG210
- ZF Ecomat 4HP / 5HP series (select variants)
It is also a direct replacement for the 4699301054 HOUSING COVER and the 4699301055 COVER assemblies in earlier production runs. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101044 | HOUSING | Main structural enclosure for valve body assembly |
| 4699301111 | HOUSING | Secondary housing for hydraulic control circuits |
| 4699301054 | HOUSING COVER | Seals and protects internal valve components |
| 4699301055 | COVER | Top cover for access port on transmission housing |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303996 | O-RING | Creates hydraulic seal between mating surfaces |
| 0734307408 | PROTECTION CAP | Covers exposed ports during transport |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shafts |
| 0630502032 | RETAINING RING | Secures bearings and gears in axial position |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
