Overview
The ZF 4656.073.047 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core power transfer module in the WG 171 series, it replaces the entire rotating assembly to restore full torque capacity and shift quality. The SKU 4656.073.047 is the direct OEM reference for this complete unit, ensuring a precise fit without modification. It sits between the torque converter and the output flange, managing all forward and reverse gear ratios.
Symptoms of Failure
- Erratic or delayed shifting under load: When the internal clutch packs or sprag clutches wear, the transmission may hesitate or slam into gear, especially when transitioning from forward to reverse.
- Internal oil leaks and low pressure: Worn seals or a cracked TRANSMISSION HOUSING can cause fluid to bypass the valve body, leading to sluggish engagement and eventual overheating.
- Metallic debris in the oil pan: Failing bearings or gear teeth produce visible metal particles, often accompanied by a whining noise during operation.
- Complete loss of drive in one range: A broken planetary gear set or damaged HOUS.FRONT SECT can cause the transmission to lose all power in a specific gear range while other ranges remain functional.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.073.047 |
| Series | WG 171 (3-speed powershift) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-strength cast iron |
| Clutch Type | Multi-disc wet (hydraulic actuated) |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 3 WG 171 |
Compatibility
This complete assembly is specifically engineered for the ZF WG 171 series powershift transmissions. It is also compatible with the WG 180 and WG 200 series when used with the appropriate HOUSING REAR PART adapter. Common applications include telehandlers, wheel loaders, and industrial forklifts from manufacturers such as JCB, Manitou, and Linde. Always verify the bellhousing pattern and output flange configuration before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating components |
| 4656301066 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting the hydraulic valve body from debris |
| 4656301037 | TUBE | Lubrication oil delivery tube for clutch pack cooling |
| 0634313514 | O-RING | Seals the housing joint to prevent external oil leaks |
| 0636100803 | CAP SCREW | M12 fastener securing the rear cover plate |
| 4656301042 | HOUSING REAR PART | Rear section supporting the output shaft bearing |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing assembly |
| 0636100801 | CAP SCREW | M10 bolt for the front section mounting |
| 0636100160 | CAP SCREW | M8 bolt for the screen sheet retainer |
Frequently Asked Questions
Q: Can this assembly be rebuilt, or is it a sealed unit?
A: The ZF 4656.073.047 is a serviceable assembly. It can be disassembled to replace individual components such as the HOUS.FRONT SECT or clutch packs, though many operators choose a complete unit for minimal downtime.
Q: What is the typical lifespan of this transmission assembly?
A: With proper maintenance and clean hydraulic oil, the WG 171 assembly often exceeds 8,000 operating hours. Early failure is usually caused by contamination or a damaged SCREEN SHEET allowing debris into the valve body.
Q: Does this unit include the torque converter?
A: No, the 4656.073.047 covers the gearbox section only. The torque converter and TUBE assembly must be ordered separately if needed.
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