Overview
The ZF 4651.033.005 3 WG 100(300) Powershift Transmission Assembly is a complete, ready-to-install unit designed for heavy-duty off-highway applications. As a core component of the WG 100 Series, this assembly integrates the clutch pack, planetary gear set, and hydraulic control system into a single sealed unit. The SKU 4651.033.005 identifies the exact OEM-spec configuration for ZF 3-speed powershift transmissions, ensuring precise gear engagement under high torque loads. This unit sits between the torque converter and the output drive, managing power distribution to the axles. For optimal sealing and structural integrity, it is commonly paired with the 4651101006: TRANSMISSION HOUSING and the 4651301034: HOUSING, which provide the rigid mounting points required for sustained operation.
Symptoms of Failure
- Delayed or harsh gear engagement – When the 4651.033.005 assembly wears, internal clutch clearance increases, causing a noticeable lag when shifting from neutral to forward or reverse. This often manifests as a “clunk” or jerky start.
- Hydraulic oil leaks around the housing interface – Degraded seals within the unit allow transmission fluid to escape, typically pooling near the bell housing or output flange. A failing 0634303928: O-RING is a common culprit, leading to low pressure and slipping.
- Intermittent power loss under load – Worn friction discs or piston seals cause the transmission to slip during uphill climbs or heavy hauling, resulting in rising oil temperatures and reduced machine speed.
- Unusual whining or grinding noises – Bearing wear inside the 3 WG 100(300) assembly produces a high-pitched whine that increases with engine RPM, often accompanied by metallic debris in the oil pan.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.033.005 |
| Assembly Type | 3 WG 100(300) Powershift Transmission |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 300 Nm (221 ft-lbs) |
| OEM Reference | ZF 4651.033.005 |
| Seal Type | Viton O-rings (multiple sizes) |
Compatibility
This complete unit is engineered for the ZF WG 100 Series, specifically the 3 WG 100(300) variant. It is directly compatible with ZF models including WG 100, WG 120, and WG 150 transmissions found in telescopic handlers, wheel loaders, and agricultural tractors. For higher torque applications, the assembly also fits select WG 180 and WG 200 series when used with the appropriate 4651301013: HOUSING adapter. Always verify the bell housing pattern and input shaft spline count before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301034 | HOUSING | Intermediate housing for clutch pack support |
| 0634303928 | O-RING | Seals hydraulic fluid between housing joints |
| 4651301013 | HOUSING | Adapter housing for output shaft alignment |
| 4651301015 | SCREEN SHEET | Filters debris from hydraulic oil flow |
| 4651301035 | SCREEN SHEET | Secondary filtration for valve body circuit |
| 0630361028 | SEALING CAP | Closes pressure test ports |
| 4475280060 | SCREW PLUG | Secures drain/fill openings |
| 0634303312 | O-RING | Seals screw plug against leakage |
| 0630361063 | SEALING CAP | Protects breather valve from contamination |
