Overview
The ZF 4651.004.032 4 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the core shifting mechanism, torque converter, and planetary gear sets into a single, ready-to-install package. As the central power transfer component in the WG 100 series, it converts engine torque into controlled, multi-speed output for loaders, graders, and industrial vehicles. The SKU 4651.004.032 identifies this as a fully assembled unit, ensuring precise alignment of internal components such as the 4651101007 TRANSMISSION HOUSING and the 4651301029 HOUSING, which together provide structural integrity and oil flow paths.
Symptoms of Failure
- Delayed or harsh engagement: When the internal clutches or seals wear, you may experience a noticeable lag or a jarring shift when moving from neutral to forward or reverse. This often points to pressure loss within the 0634303928 O-RING sealing points.
- Torque converter shudder under load: A vibration or shudder during acceleration, especially at low speeds, indicates wear in the stator or turbine assembly. This is a common long-tail search query for “ZF powershift shudder fix.”
- External oil leaks at housing seams: Visible fluid weeping around the main case joints suggests gasket or seal degradation. Leaks often originate from the interface between the 4651301024 HOUSING and the main transmission body.
- Intermittent gear slipping under heavy load: If the transmission momentarily loses power during a climb or push, internal piston seals or worn clutch packs are likely failing. This symptom is frequently searched as “ZF WG 100 slipping under load.”
Technical Specifications
| Specification | Value |
|---|---|
| Assembly Weight (dry) | Approx. 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | Cast Iron Housing / Steel Gears |
| OEM Reference | ZF 4651.004.032 (4 WG 100/500) |
| Torque Capacity | 500 Nm (max input) |
| Number of Speeds | 4 Forward / 4 Reverse (powershift) |
Compatibility
This complete unit is engineered for the ZF WG 100 series, specifically the 4 WG 100(500) variant. It is also compatible with the following ZF transmission models that share the same bellhousing pattern and input shaft spline: WG 100, WG 120, and WG 150. For higher torque applications (WG 180 or WG 200), internal component upgrades are required, but the housing architecture remains similar. Always verify the serial number against your existing unit before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural case for gear and shaft support |
| 4651301029 | HOUSING | Rear cover housing for oil distribution |
| 0634303928 | O-RING | Seals housing joints against fluid leaks |
| 4651301024 | HOUSING | Intermediate housing for clutch pack assembly |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic oil |
| 4651303005 | SCREEN SHEET | Secondary oil strainer for valve body |
| 0636101032 | CAP SCREW | Fastener for housing flange connections |
| 0630361028 | SEALING CAP | Plugs unused hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain/fill holes |
| 0634303312 | O-RING | Seals screw plug and cap interfaces |
