Overview
The ZF 4656.073.045 3 WG 171 Powershift Transmission Assembly is a complete, fully assembled unit engineered for heavy-duty off-highway applications. This core assembly integrates the main gear train, clutch packs, and hydraulic control system within a single, ready-to-install package. As a complete unit, it replaces the need to source individual internal components, significantly reducing rebuild time. The SKU 4656.073.045 specifically denotes the 3-speed configuration of the WG 171 series, designed to deliver reliable power transfer in wheel loaders, dozers, and material handlers. It sits as the central power distribution module between the torque converter and the final drive.
Symptoms of Failure
When the ZF 4656.073.045 assembly begins to fail, operators often notice specific performance degradation. Recognizing these symptoms early can prevent catastrophic drivetrain damage:
- Delayed or harsh engagement: A noticeable lag when shifting from forward to reverse, or a jarring “clunk” during gear changes, indicates internal clutch pack wear or hydraulic pressure loss within the unit.
- Transmission overheating: If the unit runs consistently hot, it may be due to internal seal failure causing oil bypass, or a clogged SCREEN SHEET restricting lubrication flow.
- Oil leaks from the bell housing: Fluid weeping from the front of the assembly often points to a failing front seal or a crack in the HOUS.FRONT SECT.
- Gear slipping under load: The engine revs but the machine loses pulling power, typically caused by worn clutch discs or a damaged TUBE that supplies oil to the rotating clutches.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.073.045 |
| Assembly Type | Complete Powershift Unit (3 WG 171) |
| OEM Reference | ZF WG 171 Series |
| Estimated Weight | 185 kg (408 lbs) |
| Housing Material | High-Grade Cast Iron |
| Number of Speeds | 3 Forward / 3 Reverse |
| Primary Housing | TRANSMISSION HOUSING |
| Sealing Component | O-RING |
| Fastener (M10) | CAP SCREW |
Compatibility
This complete assembly is specifically designed for the ZF WG 171 transmission series. While the core architecture is shared across the WG family, the 4656.073.045 is calibrated for the 171 variant. It is also compatible with select models in the WG 180 and WG 200 series when used in conjunction with the correct HOUSING REAR PART and adapter plate. Common applications include ZF 3 WG 171 systems found in Volvo L70, L90, and Caterpillar 924G wheel loaders. Always verify the bell housing pattern and torque converter fitment before installation.
Related Components
These parts are frequently replaced or inspected when servicing the complete assembly:
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656301066 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4656201015 | SCREEN SHEET | Fine mesh filter for hydraulic oil |
| 4656301037 | TUBE | Oil delivery tube to clutch packs |
| 0634313514 | O-RING | Seals fluid passages between housings |
| 0636100803 | CAP SCREW | M10 bolt for housing assembly |
| 4656301042 | HOUSING REAR PART | Rear cover for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | M8 bolt for valve body attachment |
| 0636100160 | CAP SCREW | M16 bolt for final drive connection |
Frequently Asked Questions
Q: Is the ZF 4656.073.045 a direct bolt-in replacement for all WG 171 transmissions?
A: Yes, it is a direct replacement for the 3-speed WG 171 series. However, you must verify the torque converter pilot diameter and the output flange spline count match your specific application, as variations exist between OEM implementations.
Q: What is the typical lifespan of this complete assembly before needing a rebuild?
A: Under normal operating conditions with proper maintenance (clean oil and filter changes every 500 hours), the assembly can last 8,000 to 12,000 hours. Harsh environments or heavy loading cycles may reduce this interval.
Q: Can I install this unit without replacing the O-rings and cap screws?
A: It is strongly recommended to replace all sealing components and fasteners during installation. We suggest using new O-RING and CAP SCREW sets to prevent leaks and ensure proper clamping force on the housings.
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Phone: +86 158 2286 3467 |
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