Overview
The ZF 0634.307.061 FOUR-LIP RING is a critical dynamic sealing component engineered for high-pressure environments within ZF powershift transmissions used in construction machinery. This OEM genuine part, identified by SKU 0634.307.061, sits at the interface between rotating shafts and stationary housings, specifically where the output shaft exits the transmission case. Its primary function is to prevent hydraulic fluid migration and contain system pressure while allowing for minor shaft misalignment. The four-lip design provides redundant sealing layers, ensuring long-term reliability in heavy-duty applications. When installed correctly, this ring works in concert with the 4108101068: HOUSING to maintain a sealed barrier against contaminants.
Symptoms of Failure
When the ZF 0634.307.061 begins to degrade, operators will notice distinct performance issues. The most common symptom is hydraulic oil weeping from the output shaft area, often visible as a thin film on the transmission housing. Another clear indicator is intermittent gear slippage under load, caused by pressure loss in the clutch circuits. You may also detect aeration of transmission fluid, appearing as foam on the dipstick, which results from air ingress past the worn lip. Finally, abnormal whining or chattering noises from the transmission during low-speed operation often point to this seal losing its lubricating film. Addressing these symptoms early prevents damage to the 4108201177: HOUSING and adjacent components.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0634.307.061 |
| Type | Four-Lip Radial Shaft Seal |
| Outer Diameter (OD) | 85.0 mm (estimated) |
| Inner Diameter (ID) | 65.0 mm (estimated) |
| Width | 12.0 mm (estimated) |
| Material | Nitrile Rubber (NBR) with Steel Insert |
| Weight | 0.04 kg |
| OEM Reference | ZF 0634.307.061 |
Compatibility
This four-lip ring is primarily specified for ZF WG180 and WG200 series powershift transmissions, commonly found in wheel loaders, dozers, and graders from manufacturers like Caterpillar, Volvo, and Liebherr. It also fits select WG120 and WG150 models where the output shaft diameter matches. Always verify the shaft and bore dimensions before ordering. The seal interfaces directly with the 4108301304: BEARING COVER and requires the 0636302056: SCREW PLUG for proper pressure venting during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101068 | HOUSING | Encloses the seal and shaft assembly |
| 4108201177 | HOUSING | Secondary housing for bearing support |
| 0636302056 | SCREW PLUG | Seals oil passages in the housing |
| 4108301304 | BEARING COVER | Protects the bearing and retains the seal |
| 4108306173 | GASKET | Provides static sealing between mating surfaces |
| 0750110040 | SHAFT SEAL | Alternative single-lip seal for low-pressure applications |
| 0636302013 | SCREW PLUG | Drain or vent plug for the housing |
| 0501309567 | THERMOMETER | Monitors transmission fluid temperature |
| 4108338020 | ADAPTER | Connects the seal housing to the transmission case |
| 4108111050 | POWER TAKE-OFF | Transfers engine power to auxiliary equipment |
