Overview
The ZF 4166.339.023 LOCKING PLATE is a critical retention component engineered specifically for the WG65 series transmission. This OEM genuine part functions as a mechanical barrier, securing the output shaft assembly within the main gear train to prevent axial displacement during high-torque operations. Located adjacent to the 4616105402: OUTPUT and the 4005303005: OUTPUT FLANGE, the locking plate ensures that rotational forces are contained without lateral movement. The SKU 4166.339.023 is manufactured to ZF’s original tolerances, making it a direct-fit replacement for maintenance or rebuild projects on heavy-duty WG65 gearboxes.
Symptoms of Failure
- Output shaft end-play or axial wobble — When the locking plate fatigues, the output shaft can shift forward, causing vibration during gear engagement. This is a common “ZF WG65 output shaft play” issue.
- Transmission fluid seepage near the rear housing — A worn locking plate allows the output flange to move, breaking the seal at the 0634801152: SEALING RING. Look for oil drips under the bell housing.
- Intermittent gear slipping under load — Loss of plate retention reduces clamping force on the output assembly, leading to momentary power loss when climbing or hauling.
- Metallic rattling from the transmission case — A loose locking plate can contact the 4616101119: TRANSMISSION HOUSING, producing a distinct chatter at idle.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.339.023 |
| Material | Case-hardened steel (DIN 1.7131) |
| Thickness | 4.5 mm |
| Outer Diameter | 92 mm |
| Bolt Hole Pattern | 4 x 10.5 mm (M10) |
| Weight | 0.18 kg |
| OEM Reference | ZF 4166.339.023 |
| Surface Finish | Phosphate-coated |
Compatibility
This locking plate is primarily designed for the ZF WG65 series. It is also compatible with the WG180, WG200, and WG210 transmissions where the output shaft retention system uses a four-bolt locking plate pattern. Always verify the bolt hole spacing and thickness against your existing plate. The plate works in conjunction with 0636011038: HEXAGON SCREW fasteners to secure the assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from gear train to flange |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to driveshaft |
| 4616101119 | TRANSMISSION HOUSING | Encloses and supports all internal components |
| 0636011038 | HEXAGON SCREW | Secures locking plate to output assembly |
| 0636011118 | HEXAGON SCREW | Mounts housing cover |
| 0636016015 | HEXAGON SCREW | Fastens flange to output shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns locking plate during installation |
| 0634313118 | O-RING | Seals oil passage at output bore |
| 0636304019 | SCREW PLUG | Closes inspection port on housing |
| 0634801152 | SEALING RING | Prevents fluid loss at output flange |
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