Overview
The ZF 4644.183.097 LOOSE PARTS for WG180 is a critical internal component designed to maintain precise hydraulic and mechanical alignment within the transmission assembly. This OEM genuine part, identified by SKU 4644.183.097, functions as a spacer and alignment element within the valve body and clutch pack region of the WG 180 series. It ensures that adjacent assemblies, such as the TRANSMISSION HOUSING (4644101249) and the TRANSMISSION HOUSING (4644301402), remain correctly positioned under high torque loads. Without this loose part, the transmission’s internal clearances can shift, leading to pressure loss and inefficient power transfer.
Symptoms of Failure
- Erratic gear engagement and delayed shifting: When the 4644.183.097 wears or deforms, the valve body loses precise alignment, causing hesitation when shifting from neutral to drive or reverse.
- Intermittent oil pressure fluctuations: A worn loose part allows the O-RING (0634306323) to shift, resulting in sudden drops in line pressure that trigger warning lights.
- Metallic rattling from the transmission bell housing: Loose or fatigued parts create vibration against the COVER PLATE (4644301298), producing a distinct noise during acceleration.
- Gradual fluid seepage around the housing joint: Misalignment caused by a failing 4644.183.097 compromises the seal between the housing and cover plate, leading to slow oil leaks.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.183.097 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Outer Diameter | 85 mm |
| Inner Diameter | 42 mm |
| Thickness | 12 mm |
| OEM Reference | ZF 4644.183.097 |
| Torque Rating | 180 Nm |
Compatibility
This genuine ZF part is primarily engineered for the WG 180 Series transmissions. It is also compatible with the WG 200 and WG 211 series when used in conjunction with the correct TRANSMISSION HOUSING (4644301402). For applications requiring a different shift interface, the SHIFT SYSTEM (4644159347) may be needed. Always verify fitment with your specific transmission model number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301402 | TRANSMISSION HOUSING | Secondary housing for valve body area |
| 4644301298 | COVER PLATE | Seals the housing and retains internal parts |
| 0634306323 | O-RING | Prevents fluid leakage at joint interfaces |
| 0636305026 | SCREW PLUG | Closes hydraulic passages during service |
| 4644301279 | SCREEN SHEET | Filters debris from transmission fluid |
| 4644301088 | SEALING CAP | Protects open ports from contamination |
| 4644159347 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4475280036 | SCREW-IN SLEEVE | Provides threaded mounting for sensors |
| 4644306511 | GEAR SHIFT HOUSING | Encloses shift fork and actuator assembly |
