Overview
The ZF 4616.129.402 CLOSING COMPONENTS is a precision-engineered sealing assembly designed for the WG65 series of off-highway transmissions. This OEM genuine part functions as the primary closure mechanism for the transmission housing, preventing fluid migration and maintaining internal pressure integrity. Specifically, the 4616.129.402 closing component interfaces directly with the TRANSMISSION HOUSING to seal the main cavity, ensuring that hydraulic circuits remain isolated from external contaminants. As a critical wear item, this SKU is manufactured to ZF’s exacting tolerances for the WG65 platform, where it is secured using HEXAGON SCREW fasteners during installation.
Symptoms of Failure
- External oil seepage at the housing joint: When the closing component degrades, operators often notice fluid weeping around the mating surface between the HOUSING and the transmission case, particularly after extended high-torque operation.
- Intermittent gear engagement hesitation: A worn 4616.129.402 can cause pressure drops in the clutch packs, leading to delayed shifts or “gear hunting” during load cycles.
- Contaminated transmission fluid: Cracks in the closing component allow dirt and moisture ingress, visible as sludge or discoloration in the oil sample.
- Audible hydraulic whine: Loss of seal integrity creates cavitation noise, especially when the transmission is cold or under heavy load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.129.402 |
| Material | High-grade aluminum alloy with nitrile sealing lip |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 120 mm |
| Inner Diameter | 85 mm |
| Height | 32 mm |
| OEM Reference | ZF 4616.129.402 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This closing component is specifically validated for the ZF WG65 series transmissions, which include models such as WG65, WG70, and WG80. It is also compatible with the WG180 and WG200 variants when used in conjunction with the HOUSING adapter plate. The part is not interchangeable with WG120 or WG150 series without modification to the mounting flange. Always verify your transmission serial number against the ZF parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101116 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011118 | HEXAGON SCREW | Fastener for closing component retention |
| 4616301307 | HOUSING | Intermediate housing for clutch assembly |
| 4616301309 | HOUSING | Adapter housing for WG180/200 models |
| 0636011038 | HEXAGON SCREW | Secondary fastener for housing attachment |
| 0636016015 | HEXAGON SCREW | High-torque bolt for load-bearing joints |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0634313118 | O-RING | Static seal between housing and closing component |
| 0636304019 | SCREW PLUG | Drain/fill port seal for fluid access |
| 0634801152 | SEALING RING | Dynamic seal for rotating shaft interfaces |
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