Overview
The ZF 4616.306.087 COVER PLATE is a critical sealing and protective component designed for the WG 65 series of heavy-duty automatic transmissions. This OEM genuine part mounts directly to the main transmission housing, serving as a barrier against contaminants while maintaining internal hydraulic pressure. The SKU 4616.306.087 specifically interfaces with the torque converter housing section, ensuring that lubricating oil remains contained within the gear train. When installed alongside the 4616101066 TRANSMISSION HOUSING, this cover plate forms a sealed enclosure that protects planetary gearsets and clutch packs from debris ingress.
Symptoms of Failure
- Hydraulic fluid seepage around the bell housing: A worn or warped cover plate often causes oil to weep from the mating surface, leaving visible drips on the transmission pan or undercarriage.
- Erratic shift timing or delayed engagement: When the cover plate loses its seal, internal pressure drops, leading to soft shifts or hesitation when moving from Neutral to Drive.
- Contaminated transmission fluid with metallic particles: A cracked cover plate allows external grit to enter the system, accelerating wear on bearings and clutches, which shows up as debris in the fluid.
- Audible whining or grinding from the transmission housing: Loss of structural integrity in the cover plate can cause misalignment of the 0636011118 HEXAGON SCREW fasteners, resulting in vibration noise during acceleration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.306.087 |
| Material | Die-cast aluminum alloy (A380 equivalent) |
| Overall Dimensions | 210 mm x 145 mm x 12 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4616.306.087 |
| Surface Finish | Anodized with sealing gasket groove |
| Fastener Torque Spec | 25 Nm (18.4 ft-lbs) with 0636011038 HEXAGON SCREW |
Compatibility
This cover plate is engineered for the ZF WG 65 series, but its mounting pattern also fits select models in the WG180 and WG200 families due to shared housing architecture. Specifically, it is compatible with the ZF WG65, WG180, and WG200 transmissions used in municipal buses, construction loaders, and medium-duty trucks. For proper installation, verify that the 4616301307 HOUSING or 4616301309 HOUSING is present, as these components provide the threaded mounting points for the cover plate. Always replace the mating O-ring (part 0634313118 O-RING) simultaneously to ensure a leak-free seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011118 | HEXAGON SCREW | Fastener for cover plate attachment |
| 4616301307 | HOUSING | Torque converter housing section |
| 4616301309 | HOUSING | Alternate torque converter housing variant |
| 0636011038 | HEXAGON SCREW | Mounting bolt for housing assembly |
| 0636016015 | HEXAGON SCREW | High-tensile fastener for structural joints |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0634313118 | O-RING | Seal between cover plate and housing |
| 0636304019 | SCREW PLUG | Drain or fill port closure |
| 0634801152 | SEALING RING | Static seal for threaded connections |
