Overview
The ZF 4616.101.406 TRANSMISSION HOUSING is the primary structural shell for the WG 65 series gearbox, serving as the rigid foundation that encloses the planetary gear sets, valve bodies, and rotating shafts. This OEM genuine part (SKU: 4616.101.406) precisely aligns all internal components under high torque loads, while also acting as the main oil reservoir and fluid channeling conduit. Manufactured from high-strength cast alloy, it withstands extreme thermal cycling and mechanical stress inherent in heavy-duty commercial vehicle applications.
Symptoms of Failure
- External oil seepage at mating flanges: A cracked or warped housing often causes persistent transmission fluid leaks around the bell housing or rear seal area, leading to low fluid levels and eventual gearbox overheating.
- Abnormal gear engagement noise: When the housing loses dimensional stability, bearing bores shift out of alignment, producing a distinct whining or grinding sound during gear shifts under load.
- Intermittent gear slipping under heavy load: Distortion in the housing can misalign the valve body mounting surface, causing erratic hydraulic pressure delivery and delayed clutch pack engagement.
- Contaminated fluid from internal cracking: Hairline fractures in the housing allow debris from the clutch packs to circulate freely, accelerating wear on the FILTER INSERT and reducing overall transmission life.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.101.406 |
| Material | High-grade cast aluminum alloy (EN AC-42100) |
| Dry Weight | 38.5 kg (84.9 lbs) |
| Overall Length | 620 mm |
| Overall Width | 410 mm |
| Overall Height | 385 mm |
| Bolt Hole Pattern | 12-point, M12 x 1.5 |
| OEM Reference | 4616.101.406 (ZF Friedrichshafen) |
| Sealing Surface Finish | Ra 1.6 µm max |
Compatibility
This housing is engineered exclusively for the ZF WG 65 series transmission, commonly found in municipal buses, refuse trucks, and medium-duty construction vehicles. It is not interchangeable with the WG 180 or WG 200 series housings due to different bell housing bolt patterns and internal bearing journal dimensions. Always verify the transmission serial number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Secondary housing section for torque converter cavity |
| 0636011038 | HEXAGON SCREW | M10 x 30 flange bolt for housing-to-bell housing joint |
| 0636011118 | HEXAGON SCREW | M12 x 40 bolt securing rear cover to housing |
| 0636016015 | HEXAGON SCREW | M8 x 25 bolt for valve body mounting bracket |
| 0631306085 | CYLINDRICAL PIN | Dowel pin for precise housing-to-cover alignment |
| 0634313118 | O-RING | Seals oil passage between housing sections |
| 0636304019 | SCREW PLUG | M18 x 1.5 drain plug for housing oil sump |
| 0634801152 | SEALING RING | Copper washer for drain plug sealing |
| 0732611049 | FILTER INSERT | Internal suction filter for hydraulic circuit |
| 0634303718 | O-RING | Seals filter housing to main housing bore |
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