Overview
This ZF 4656.073.042 3 WG 171 Powershift Transmission Assembly is a complete, ready-to-install unit designed for heavy-duty industrial applications. As a fully assembled powershift transmission, it integrates the gear train, clutch packs, and hydraulic control system into a single robust housing. The SKU 4656.073.042 serves as the core power transfer component in ZF’s WG 171 series, converting engine torque into controlled wheel or implement motion. This assembly sits directly between the engine flywheel and the final drive, managing gear ratios under load without interrupting power flow. It is commonly found in construction loaders, forklifts, and agricultural tractors requiring reliable, high-torque shifting performance.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or hydraulic seals wear, operators notice a lag between shifting and actual gear change, often accompanied by a jarring thud.
- Transmission fluid leaks at the housing joints: Deterioration of the main seal or gasket between the TRANSMISSION HOUSING and the HOUS.FRONT SECT leads to visible oil drips, reducing hydraulic pressure.
- Loss of power under load (slipping): Worn clutch discs or a clogged SCREEN SHEET restrict oil flow, causing the transmission to slip when moving heavy materials uphill or in soft terrain.
- Unusual whining or grinding noises: Bearing failure or debris contamination from a damaged TUBE creates audible metal-on-metal sounds during operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4656.073.042 |
| Assembly Type | Complete Powershift Transmission (3 WG 171) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4656.073.042 / 3 WG 171 |
| Max Input Torque | 1,200 Nm |
| Oil Capacity | 12.5 liters |
Compatibility
This complete unit is specifically engineered for the ZF WG 171 series powershift transmissions. It is also compatible with the following ZF transmission models that share the same mounting pattern and hydraulic architecture: WG 180, WG 200, and WG 150 (with adapter kit). The assembly directly replaces OEM units in ZF 3 WG 171 systems used in telehandlers, wheel loaders, and industrial sweepers. Always verify the bell housing pattern and output flange configuration against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses gears and shafts |
| 4656301066 | HOUS.FRONT SECT | Front section housing that supports the input shaft and pump drive |
| 4656201015 | SCREEN SHEET | Fine mesh filter that protects the hydraulic valve body from debris |
| 4656301037 | TUBE | Oil delivery tube that routes pressurized fluid to clutch packs |
| 0634313514 | O-RING | Seals the oil tube connections to prevent external leaks |
| 0636100803 | CAP SCREW | Fastens the housing sections together under high torque |
| 4656301042 | HOUSING REAR PART | Rear casing that supports the output shaft and parking brake |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel that ensures precise mating of housing halves |
| 0636100801 | CAP SCREW | Secures the front section to the main housing |
| 0636100160 | CAP SCREW | Mounts the rear housing cover to the assembly |
Frequently Asked Questions
Q: Can the ZF 4656.073.042 be rebuilt, or must it be replaced as a complete unit?
A: While internal components like clutch discs and seals are serviceable, this assembly is typically replaced as a complete unit to ensure proper hydraulic calibration. Rebuilding requires specialized tools and access to the HOUSING REAR PART and CYLINDRICAL PIN for alignment.
Q: What is the typical lifespan of this powershift transmission under normal operating conditions?
A: With regular oil changes and a clean SCREEN SHEET, the 3 WG 171 assembly often exceeds 8,000 hours in construction equipment. Harsh environments may reduce this to 5,000 hours.
Q: Does this unit include the necessary cap screws and o-rings for installation?
A: The complete assembly ships with the main housing and internal components, but we recommend ordering O-RING 0634313514 and CAP SCREW 0636100803 separately for a leak-free installation.
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Phone: +86 158 2286 3467 |
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