Overview
The ZF 4646.101.485 TRANSMISSION HOUSING is a precision-machined OEM sub-assembly designed for the WG 250, WG 260, and WG 310 series of industrial transmissions. This structural component serves as the primary shell that encloses the gear train, clutch packs, and hydraulic circuits, ensuring correct alignment of internal shafts and bearings under heavy torque loads. As a direct replacement for the original factory part, SKU 4646.101.485 restores the transmission’s structural integrity and oil containment, preventing contamination from external debris. When rebuilding a WG-series unit, this housing is often paired with the 4646101189: TRANSMISSION HOUSING for multi-section assemblies, and the 4646301317: HOUSING for intermediate support sections.
Symptoms of Failure
- External oil seepage at mating flanges: Cracks or warpage in the 4646.101.485 housing cause transmission fluid to weep from the bell housing or side covers, leading to low fluid levels and eventual overheating.
- Gear engagement noise or hard shifting: A distorted housing misaligns the countershaft and main shaft, producing a whining or grinding sound during gear changes, especially under load.
- Recurring bearing failure: Bore wear in the housing allows bearing outer races to spin, generating metallic debris in the oil and accelerating wear on the 4656306171: VALVE BLOCK and clutch assemblies.
- Vibration through the driveline: A cracked housing cannot maintain proper gear mesh, transmitting harmonic vibrations to the output shaft and connected equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4646.101.485 |
| Material | High-grade cast iron (GGG-40) with corrosion-resistant coating |
| Overall Length | ~480 mm (18.9 in) |
| Overall Width | ~320 mm (12.6 in) |
| Overall Height | ~290 mm (11.4 in) |
| Dry Weight | ~22.5 kg (49.6 lbs) |
| Bolt Hole Pattern | 12-point flange, M12 x 1.5 threads |
| OEM Reference | ZF 4646.101.485 (OEM sub-assembly) |
| Sealing Surface | Flatness tolerance ≤ 0.05 mm across flange face |
Compatibility
This housing is engineered for the ZF WG-series powershift transmissions used in off-highway and construction equipment. It is a direct fit for the WG 250, WG 260, and WG 310 series. It also serves as a service replacement for earlier WG 180 and WG 200 models when used with the appropriate adapter kit. The housing interfaces with the 4656306190: CONNECTING HOUSING to bridge the torque converter section, and the 0501213997: PRESSURE REGULATOR mounts directly to its valve bore. Always verify the casting number against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101189 | TRANSMISSION HOUSING | Primary shell for front gear section |
| 4646301317 | HOUSING | Intermediate support housing for clutch packs |
| 0636115293 | 螺栓 | M12 flange bolt for housing assembly |
| 0636101153 | CAP SCREW | Hex-head cap screw for cover plate |
| 0736300232 | 螺栓 | High-tensile bolt for bell housing joint |
| 4475280208 | SCREW PLUG | Oil drain or test port plug |
| 0634316523 | O-RING | Seal between housing and valve block |
| 4656306171 | VALVE BLOCK | Hydraulic control manifold |
| 4656306190 | CONNECTING HOUSING | Adapter between torque converter and main case |
| 0501213997 | PRESSURE REGULATOR | Maintains hydraulic system pressure |
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