Overview
The ZF 4651.004.017 4 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty industrial applications. This assembly serves as the central power transfer module within the WG 100 series, managing torque distribution across four forward and reverse gears. The SKU 4651.004.017 integrates the clutch pack, planetary gear sets, and hydraulic control valves into a single, ready-to-install package. It directly interfaces with the TRANSMISSION HOUSING to ensure precise alignment and oil flow, making it a critical replacement for worn or failed transmissions in construction and agricultural machinery.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or seals degrade, the transmission may hesitate or fail to hold gears during operation, especially under heavy torque demands.
- Hydraulic fluid leaks near the housing interface: Worn O-rings or housing cracks can cause oil seepage around the HOUSING connection, leading to low pressure and overheating.
- Unusual whining or grinding noises from the transmission: Damaged bearings or planetary gear wear within the assembly produce audible metallic sounds during shifting or at idle.
- Delayed or harsh shifting between forward and reverse: Internal valve body contamination or worn solenoids result in sluggish or jarring gear changes, reducing operator control.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4651.004.017 |
| Assembly Type | Complete Powershift Unit (4 WG 100/500) |
| Weight (estimated) | 185 kg (408 lbs) |
| Dimensions (L x W x H) | 620 x 480 x 410 mm |
| Housing Material | Cast Aluminum Alloy |
| Seal Material | Nitrile Rubber (NBR) |
| Max Input Torque | 500 Nm (369 lb-ft) |
| Fluid Capacity | 12.5 liters (3.3 gallons) |
Compatibility
This assembly is engineered for the ZF WG 100 series, specifically the 4 WG 100(500) variant. It is also compatible with the WG 180 and WG 200 series transmissions when used with the appropriate HOUSING adapter. The unit fits models in ZF’s 4WG-100, 4WG-180, and 4WG-200 families, commonly found in telehandlers, wheel loaders, and forklifts. Always verify the housing and O-RING part numbers for proper sealing during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4651301029 | HOUSING | Secondary housing for clutch pack retention |
| 0634303928 | O-RING | Seals fluid passages between housing sections |
| 4651301024 | HOUSING | Adapter housing for WG 180/200 compatibility |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic oil flow |
| 4651303005 | SCREEN SHEET | Secondary filtration for valve body protection |
| 0636101032 | CAP SCREW | Fastens housing flanges with high torque rating |
| 0630361028 | SEALING CAP | Closes hydraulic test ports to prevent leaks |
| 4475280060 | SCREW PLUG | Seals drain and fill openings in the housing |
| 0634303312 | O-RING | Provides leak-proof seal for screw plug interfaces |
