Overview
The ZF 4656.073.036 3 WG 171 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty industrial applications. This SKU 4656.073.036 serves as the central power distribution hub within the WG 171 series, integrating the torque converter, planetary gear sets, and clutch packs into a single, ready-to-install module. It directly replaces worn or failed assemblies to restore full operational efficiency in wheel loaders, forklifts, and construction machinery. The unit interfaces seamlessly with the 4656101028: TRANSMISSION HOUSING and the 4656301066: HOUS.FRONT SECT to form the primary structural enclosure.
Symptoms of Failure
- Delayed or harsh gear engagement: When the assembly wears, hydraulic pressure drops, causing noticeable lag or jarring shifts during direction changes.
- Transmission fluid leaks at the housing seam: Degraded seals allow oil to escape, often pooling under the vehicle near the bell housing area.
- Intermittent power loss under load: Slipping clutch packs inside the unit result in reduced torque delivery, especially when climbing grades or lifting heavy loads.
- Unusual whining or grinding noises: Worn bearings or planetary gears produce metallic sounds that intensify with engine RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.073.036 |
| Assembly Type | Complete Powershift Transmission Unit |
| Series | WG 171 |
| Estimated Weight | 185 kg (408 lbs) |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 3 WG 171 |
| Sealing Components | 0634313514: O-RING, 0631306816: CYLINDRICAL PIN |
| Fasteners | 0636100803: CAP SCREW, 0636100801: CAP SCREW, 0636100160: CAP SCREW |
Compatibility
This complete unit is engineered for the ZF WG 171 series, but its core architecture also supports select models in the WG 180 and WG 200 families due to shared bolt patterns and hydraulic circuits. It is commonly installed in equipment such as the ZF 3WG171, 4WG180, and 4WG200 transmissions. For proper fitment, always verify the bell housing alignment with the 4656301042: HOUSING REAR PART and the oil flow path via the 4656301037: TUBE.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656301066 | HOUS.FRONT SECT | Front section housing for torque converter and pump |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting hydraulic valves from debris |
| 4656301037 | TUBE | Oil transfer tube for clutch pack lubrication |
| 0634313514 | O-RING | Static seal preventing fluid leaks at joints |
| 0636100803 | CAP SCREW | M10 fastener for housing flange attachment |
| 4656301042 | HOUSING REAR PART | Rear casing supporting output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0636100801 | CAP SCREW | M12 bolt for securing the front section |
| 0636100160 | CAP SCREW | M8 screw for valve body and cover retention |
Frequently Asked Questions
Q: Can the 4656.073.036 assembly be rebuilt, or must it be replaced as a complete unit?
A: While internal components like clutch discs and seals can be serviced, the assembly is factory-balanced and pressure-tested. For most industrial applications, replacing the complete unit ensures reliable performance and avoids hidden wear in the planetary carriers.
Q: What is the typical service life of this ZF 3 WG 171 transmission assembly?
A: Under normal operating conditions with proper fluid maintenance, the unit can last 8,000 to 12,000 hours. Contaminated oil or frequent overloads will significantly reduce this lifespan.
Q: Do I need to replace the 4656201015: SCREEN SHEET when installing this assembly?
A: Yes, always install a new screen sheet and fresh O-rings (such as 0634313514) to prevent debris from circulating through the new unit.
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