Overview
The ZF 4646.301.172 COVER is a critical sealing component engineered for the WG 250, WG 260, and WG 310 transmission series. Positioned on the rear or intermediate housing section, this OEM genuine part ensures the integrity of the transmission’s internal oil circuit by preventing contamination ingress and maintaining proper hydraulic pressure. As a factory-spec replacement, the SKU 4646.301.172 directly interfaces with the TRANSMISSION HOUSING and the HOUSING assembly, forming a sealed boundary that protects gears and clutches from debris. Without this cover, the transmission cannot sustain the precise lubrication required for heavy-duty industrial operations.
Symptoms of Failure
- Hydraulic fluid seepage at the rear housing joint: A worn or cracked 4646.301.172 cover allows oil to weep past the gasket surface, leaving visible drips under the transmission bell housing.
- Erratic gear engagement under load: When the cover loses its seal, air enters the hydraulic circuit, causing delayed or slipping shifts in WG 250/WG 260 units.
- Contaminated transmission oil: A compromised cover permits dirt and moisture to enter through the housing interface, leading to accelerated wear on internal bearings and clutch packs.
- Overheating in the clutch area: Loss of oil volume due to cover failure reduces cooling flow, triggering thermal alarms or burnt oil smell during extended operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4646.301.172 |
| Material | Die-cast aluminum alloy (A380) |
| Overall Dimensions | 245 mm x 180 mm x 35 mm |
| Weight | 1.42 kg (3.13 lbs) |
| OEM Reference | ZF 4646.301.172 |
| Surface Finish | Machined sealing face, anodized |
| Fastener Torque Spec | 25 N·m (18.4 lb-ft) |
| Gasket Required | Integrated O-ring (not included) |
Compatibility
This cover is designed for ZF’s WG series powershift transmissions, specifically the WG 251, WG 250, WG 260, and WG 310 models. It also fits select WG 180 and WG 200 variants where the rear housing geometry matches the 4646.301.172 flange pattern. For precise fitment, always verify the housing casting number against the COVER SHEET and the CAP SCREW torque sequence. The part is not interchangeable with earlier WG 120 series covers due to different bolt hole spacing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101143 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301202 | HOUSING | Intermediate housing section |
| 0636101051 | CAP SCREW | Fastener for cover retention |
| 4646201019 | COVER SHEET | Gasket or shim for sealing surface |
| 4646301277 | SCREEN SHEET | Filter mesh for oil intake |
| 0730365067 | TYPE PLATE | Identification tag for transmission |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636010216 | HEXAGON SCREW | M10 bolt for housing attachment |
| 0636010174 | HEXAGON SCREW | M8 bolt for cover fastening |
| 4646201021 | BREATHER | Pressure equalization valve |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
