Overview
The ZF 4044.306.026 Gasket for the WG65 series is a precision-engineered sealing component designed to maintain hydraulic integrity within the transmission assembly. Positioned between the TRANSMISSION HOUSING and the valve body or cover plate, this OEM genuine part prevents fluid migration and pressure loss. The SKU 4044.306.026 is critical for ensuring that the transmission’s internal lubrication and cooling circuits remain isolated, directly impacting shift quality and component longevity. Without this gasket, even minor misalignments can lead to cross-contamination of oil passages, reducing overall system efficiency.
Symptoms of Failure
- External oil seepage at the housing joint: A worn or crushed 4044.306.026 gasket often results in visible fluid trails around the WG65’s mating surfaces, especially after prolonged high-temperature operation.
- Intermittent gear slipping under load: When the gasket fails, internal pressure drops can cause clutch packs to engage inconsistently, leading to hesitation or delayed shifts during acceleration.
- Contaminated transmission fluid: A degraded seal allows debris or combustion byproducts to enter the hydraulic circuit, turning the oil dark or gritty prematurely.
- Erratic shift timing: Loss of sealing integrity between the valve body and housing can cause unpredictable shift points, often accompanied by harsh engagement noises.
Technical Specifications
| Part Number | 4044.306.026 |
| Material | Nitrile rubber (NBR) with fiber reinforcement |
| Thickness | 1.5 mm (estimated) |
| Outer Diameter | 120 mm (estimated) |
| Inner Diameter | 85 mm (estimated) |
| Weight | 0.02 kg |
| OEM Reference | ZF 4044.306.026 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This gasket is specifically designed for the ZF WG65 series transmissions, including models WG65, WG65-1, and WG65-2. It also fits select units in the WG 180 series, such as WG180 and WG180-1, where the housing interface dimensions match. For installations requiring additional sealing, pair this gasket with the O-RING (0634313118) or the SEALING RING (0634801152). Always verify your transmission’s serial number against ZF’s technical documentation before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main structural casing that houses gears and shafts |
| 0636011038 | HEXAGON SCREW | Fastener for securing housing covers |
| 0636011118 | HEXAGON SCREW | High-torque bolt for valve body attachment |
| 0636016015 | HEXAGON SCREW | Flanged screw for oil pan mounting |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0634313118 | O-RING | Static seal for hydraulic line connections |
| 0636304019 | SCREW PLUG | Threaded plug for drain or test ports |
| 0634801152 | SEALING RING | Metal-reinforced gasket for high-pressure joints |
| 0732611049 | FILTER INSERT | Internal mesh filter for oil debris removal |
| 0634303718 | O-RING | Elastomeric seal for cooler line fittings |
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