Overview
The ZF 4660.305.023 END SHIM is a precision-engineered OEM genuine component designed for the WG 92 series transmission family. This thin, hardened steel shim is installed at the axial end of the main shaft assembly, directly within the TRANSMISSION HOUSING (part 4660101012). Its primary function is to establish the correct end-play clearance between rotating and stationary components, ensuring optimal gear mesh and bearing preload. As a factory-specified shim, the SKU 4660.305.023 is critical for maintaining the precise tolerances required for long-term transmission durability under heavy-duty cycles.
Symptoms of Failure
When the ZF 4660.305.023 END SHIM wears or becomes dislodged, operators may notice several distinct failure modes. Look for these specific symptoms to diagnose a worn end shim:
- Axial shaft play and gear rattle: Excessive end float in the main shaft causes audible clunking or rattling during deceleration or idle, often misdiagnosed as bearing failure.
- Intermittent gear slipping under load: Incorrect clearance allows the gear cluster to shift axially, leading to partial disengagement and power loss during uphill climbs or heavy hauling.
- Oil contamination from metal debris: A worn shim generates fine metallic particles that circulate through the lubrication system, accelerating wear on the O-RING (part 0634100317) and other seals.
- Hard shifting or gear clash: Altered end-play changes synchronizer timing, resulting in grinding noises when engaging forward or reverse gears.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4660.305.023 |
| Material | Case-hardened spring steel (DIN 1.3505 equivalent) |
| Outer Diameter | 68.0 mm (estimated) |
| Inner Diameter | 52.5 mm (estimated) |
| Thickness | 0.30 mm (nominal, select-fit tolerance) |
| Weight | Approx. 12 grams |
| OEM Reference | ZF 4660.305.023 |
| Surface Finish | Ground, deburred edges |
Compatibility
This END SHIM is specifically engineered for the WG 92 series of ZF transmissions. Based on its part number prefix and application, it is compatible with the following models that share the same shaft and housing architecture: WG92, WG120, WG150, and WG180. It is also used in certain WG200 variants where the main shaft end-play adjustment is required. Always verify the shim thickness against the service manual when rebuilding the assembly inside the HOUSING (part 4660301020).
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101012 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301020 | HOUSING | Rear or intermediate housing section |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification and rating plate |
| 4660221012 | SUCTION TUBE | Oil pickup tube for lubrication circuit |
| 0634100317 | O-RING | Seal between housing and cover |
| 0636103273 | CAP SCREW | Fastener for housing retention |
| 0750100022 | SCREW PLUG | Sealing plug for oil passages |
| 4660101804 | TRANSMISSION HOUSING | Alternate housing variant for WG92 |
| 4660301008 | HOUSING | Alternative rear housing casting |
