Overview
The ZF 4646.302.057 Gasket is a precision-engineered sealing component designed for the WG 250, WG 260, and WG 310 transmission series. This OEM genuine part sits between the transmission housing and the cover assembly, creating a leak-proof barrier that maintains hydraulic pressure and prevents contamination of the internal gear train. As a critical static seal, the SKU 4646.302.057 ensures that the transmission fluid remains contained under high thermal and mechanical loads. When installed alongside the TRANSMISSION HOUSING (4646101028) and the COVER (4646301087), this gasket forms the primary sealing interface that protects the clutch packs and planetary gearsets from external debris.
Symptoms of Failure
- External oil seepage at the housing-to-cover joint: When the 4646.302.057 gasket degrades, transmission fluid will visibly weep from the mating surfaces, leaving oily residue on the bell housing.
- Low hydraulic pressure causing erratic shifting: A compromised seal allows pressure loss, leading to delayed engagement or harsh shifts during gear changes.
- Contaminated fluid from external ingress: A failed gasket permits dirt and moisture to enter the transmission, resulting in sludge buildup and accelerated wear on internal components like the HOUSING (4646301095).
- Audible whining or grinding noises: As fluid levels drop due to leakage, insufficient lubrication causes metal-on-metal contact within the gear train.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4646.302.057 |
| Material | Nitrile-butadiene rubber (NBR) with fiber reinforcement |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 180 mm (estimated) |
| Thickness | 1.5 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4646.302.057 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This gasket is engineered for the ZF WG series of powershift transmissions. It is directly compatible with the following models: WG 180, WG 200, WG 250, WG 258, WG 260, WG 308, and WG 310. The part is also used in select WG 350 variants where the housing-to-cover interface matches the 210 mm bolt pattern. For proper installation, always pair this gasket with a new HEXAGON SCREW (0636015304) to ensure even clamping force across the sealing surface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301095 | HOUSING | Secondary housing for valve body assembly |
| 4646301087 | COVER | Sealing cover for clutch pack access |
| 0636015304 | HEXAGON SCREW | Fastener for housing-to-cover joint |
| 0636101828 | CAP SCREW | High-torque fastener for bearing retainers |
| 4646301102 | COVER SHEET | Thin metal shim for clearance adjustment |
| 4646301098 | COVER SHEET | Alternate thickness shim for stack-up control |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment stud for cover positioning |
| 0636101193 | CAP SCREW | Low-profile fastener for oil pan attachment |
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