Overview
This complete ZF 4656.073.021 3 WG 171 Powershift Transmission Assembly is a fully integrated unit designed for heavy-duty off-highway applications. As the core of the WG 171 series, this assembly manages torque distribution and gear selection under extreme loads. The SKU 4656.073.021 replaces the entire transmission assembly, ensuring seamless power flow from the engine to the driveline. It sits as the central drivetrain component, connecting directly to the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a sealed, oil-tight system. This unit is factory-assembled and tested, providing a direct drop-in replacement for worn or failed transmissions in loaders, graders, and industrial vehicles.
Symptoms of Failure
When the ZF 4656.073.021 assembly begins to fail, operators typically notice these specific issues:
- Erratic gear engagement or slipping under load: Worn internal clutches or damaged valve bodies cause the transmission to hesitate or lose power during acceleration, especially in higher gears.
- External oil leaks near the housing joints: Cracks or warping in the main casing allow hydraulic fluid to escape, often pooling around the bell housing or the TUBE connections.
- Metallic grinding or whining noises: Bearing failure or gear tooth damage inside the assembly produces distinct sounds that intensify with engine RPM.
- Delayed or harsh shifting: A failing SCREEN SHEET or clogged oil passages cause pressure drops, resulting in jarring shifts or a complete inability to move.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4656.073.021 |
| Series | WG 171 (3-speed Powershift) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 3 WG 171 |
| Torque Capacity | Up to 1,200 Nm |
| Oil Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This complete unit is engineered specifically for the ZF WG 171 series. It is also compatible with the WG 180 and WG 200 series transmissions when used with the appropriate adapter kits. The assembly is commonly found in ZF 3WG171, 4WG171, and 5WG171 configurations. It directly replaces the HOUSING REAR PART and integrates with the O-RING seals and CAP SCREW fasteners for a secure fit. Always verify your transmission model number before ordering.
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 input shaft and pump drive |
| 4656201015 | SCREEN SHEET | Oil filter screen preventing debris from entering valve body |
| 4656301037 | TUBE | Hydraulic fluid passage tube between sections |
| 0634313514 | O-RING | Seals fluid connections to prevent leaks |
| 0636100803 | CAP SCREW | M10 fastener for housing assembly |
| 4656301042 | HOUSING REAR PART | Rear casing for output shaft and PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing positioning |
| 0636100801 | CAP SCREW | M12 fastener for heavy-duty housing joints |
| 0636100160 | CAP SCREW | M8 fastener for cover plate attachment |
Frequently Asked Questions
Q: Is the 4656.073.021 a complete, ready-to-install unit?
A: Yes, this is a fully assembled powershift transmission including all internal clutches, shafts, and valve bodies. You will need to transfer your external components such as the torque converter and shift solenoids.
Q: Can this unit be used in a ZF WG 180 series machine?
A: It is physically compatible with WG 180 and WG 200 series housings, but you must verify the input spline count and bell housing pattern. We recommend comparing your old unit’s dimensions to the specifications listed above.
Q: What seals and fasteners should I replace during installation?
A: We strongly recommend replacing the O-RING (0634313514) and all CAP SCREW (0636100803) fasteners to ensure a leak-free assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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