Overview
The ZF 4645.306.129 SPRING SLEEVE is a precision-engineered component designed for the WG 100 and WG 201 series transmissions. This OEM genuine part acts as a critical interface between the shift mechanism and the valve body, ensuring consistent spring tension for smooth gear engagement. Located within the transmission housing assembly, the spring sleeve (SKU: 4645.306.129) absorbs axial loads and maintains proper alignment of the shifting fork. Without this sleeve, the transmission’s hydraulic control system cannot deliver reliable pressure modulation, leading to erratic performance. For complete assembly integrity, this part works in conjunction with the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING, which provide the structural foundation for the entire gear train.
Symptoms of Failure
- Delayed or harsh gear engagement – When the spring sleeve loses its temper or cracks, the shift fork cannot return to its neutral position quickly, causing a noticeable lag when shifting from Park to Drive or Reverse.
- Intermittent gear slipping under load – A worn spring sleeve fails to maintain constant pressure on the shift rail, resulting in momentary loss of power transfer during acceleration or hill climbing.
- Audible clicking or rattling from the transmission pan – A broken or fatigued spring sleeve can produce metallic noises as it rattles inside the housing, often mistaken for loose bolts or debris.
- Hydraulic fluid contamination – As the sleeve wears, metal particles can enter the oil circuit, accelerating wear on the 0634306198: O-RING and other seals, leading to eventual leaks.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4645.306.129 |
| Material | Spring steel (DIN 17223), zinc-plated |
| Outer Diameter | 28.5 mm |
| Inner Diameter | 18.0 mm |
| Length | 42.0 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4645.306.129 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This spring sleeve is specifically engineered for ZF WG 100 Series and WG 201 Series transmissions. It is a direct replacement for models including WG180, WG200, WG210, and WG211. The part also fits select WG 150 variants when used with the correct 4644301189: THREADED BUSH and 4475280043: SCREW PLUG. Always verify your transmission serial number before ordering, as minor design changes occurred after 2012 for the WG201 series.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for valve body support |
| 4644301189 | THREADED BUSH | Provides threaded anchor for shift rail |
| 4475280043 | SCREW PLUG | Seals hydraulic passages |
| 0634306198 | O-RING | Prevents fluid leaks at housing joints |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Fastens housing sections together |
| 0631610020 | SET SCREW | Locks adjustment points |
| 0501218540 | BREATHER | Equalizes internal pressure |
