Overview
The ZF 4656.073.025 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main drive components, clutch packs, and hydraulic control sections into a single ready-to-install package. As a complete unit, it eliminates the need for piecemeal rebuilding and ensures optimal gear engagement under load. The SKU 4656.073.025 is the definitive reference for this specific WG 171 configuration, serving as the central core of the driveline. It works in concert with the TRANSMISSION HOUSING to protect internal gears and with the HOUS.FRONT SECT to support the input shaft assembly.
Symptoms of Failure
When the ZF 4656.073.025 assembly begins to degrade, operators will notice distinct performance issues. Common failure symptoms include:
- Delayed or harsh engagement: The transmission hesitates before moving or slams into gear, indicating worn clutch packs or valve body issues within the assembly.
- Oil leaks at the housing seam: Fluid weeping between the main casing and the HOUS.FRONT SECT suggests gasket failure or housing distortion.
- Gear slipping under load: The engine revs but vehicle speed does not increase proportionally, a classic sign of internal pressure loss or worn friction discs.
- Contaminated transmission fluid: Metallic particles in the oil, often trapped by the SCREEN SHEET, indicate internal component wear.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.073.025 |
| Assembly Type | Complete Powershift Unit (3 WG 171) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | Cast Iron / Alloy Steel |
| OEM Reference | ZF 3 WG 171 Series |
| Sealing Kit Reference | 0634313514: O-RING |
| Fastener Reference | 0636100803: CAP SCREW |
Compatibility
This complete unit is specifically engineered for the ZF WG 171 series of powershift transmissions. It is also compatible with select models in the WG 180 and WG 200 series that share the same bellhousing pattern and input shaft configuration. The assembly interfaces directly with the HOUSING REAR PART for output support and uses the TUBE for internal lubrication routing. For precise fitment, always verify the transmission serial number against the ZF application guide.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656301066 | HOUS.FRONT SECT | Front section supporting input shaft |
| 4656201015 | SCREEN SHEET | Fluid filtration mesh |
| 4656301037 | TUBE | Internal oil delivery conduit |
| 0634313514 | O-RING | Seals fluid passages |
| 0636100803 | CAP SCREW | Housing fastener |
| 4656301042 | HOUSING REAR PART | Rear casing for output section |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for components |
| 0636100801 | CAP SCREW | Secondary housing fastener |
| 0636100160 | CAP SCREW | Flange mounting bolt |
Frequently Asked Questions
Q: Is the 4656.073.025 a direct replacement for a worn WG 171 unit?
A: Yes, this is a complete assembly that replaces the entire transmission core. It includes all internal clutches, shafts, and valve bodies, requiring only the transfer of external housings and sensors.
Q: What seals should be replaced when installing this unit?
A: It is strongly recommended to install new 0634313514: O-RING seals and 0636100803: CAP SCREW fasteners to prevent fluid leaks and ensure proper torque retention.
Q: Can this unit be used with a different ZF housing?
A: The assembly is designed for the WG 171 series. It will physically fit the 4656101028: TRANSMISSION HOUSING and 4656301042: HOUSING REAR PART from the same series. Use with other housings requires verification of bolt patterns.
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Phone: +86 158 2286 3467 |
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