Overview
The ZF 4656.073.027 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit engineered for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As a core replacement for the WG 171 series, the SKU 4656.073.027 ensures precise gear engagement under load, making it critical for wheel loaders, dozers, and industrial tractors. It sits at the heart of the driveline, transferring torque from the engine to the final drives. For structural integrity, this assembly mates directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT, which together form the rigid backbone of the unit.
Symptoms of Failure
- Delayed or harsh shifting under load: Worn clutch discs or seals inside the 4656.073.027 cause hesitation or jarring engagement, especially when the transmission is hot.
- Oil leaks from the bell housing area: Degraded gaskets or cracks in the assembly allow ATF to escape, often pooling near the TUBE connection points.
- Loss of power in forward or reverse: Internal pressure loss from worn pistons prevents full clutch pack clamping, resulting in wheel slip during heavy pushing or grading operations.
- Metallic debris in the oil filter: Advanced wear of planetary gears or bearings sheds fine metal particles, which can clog the SCREEN SHEET and restrict lubrication flow.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.073.027 |
| Assembly Type | 3 WG 171 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4656.073.027 |
| Sealing Kit Required | 0634313514: O-RING |
| Mounting Hardware | 0636100803: CAP SCREW (x8) |
Compatibility
This complete unit is specifically designed 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 adapter housings. The assembly is a direct fit for models 3 WG 171, 4 WG 171, and 5 WG 171. For rear-section support, the HOUSING REAR PART is a common companion component. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101030 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201015 | SCREEN SHEET | Fine mesh filter for hydraulic oil |
| 4656301037 | TUBE | Oil delivery conduit between sections |
| 0634313514 | O-RING | Seals housing joints against leaks |
| 0636100803 | CAP SCREW | Fastener for housing assembly |
| 4656301064 | HOUSING REAR PART | Rear casing for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | Bolt for clutch pack retention |
| 0636100160 | CAP SCREW | Fastener for valve body mounting |
Frequently Asked Questions
Q: Is the 4656.073.027 a direct bolt-in replacement for a 4 WG 171 transmission?
A: Yes, this complete unit is a direct mechanical and hydraulic replacement for all WG 171 variants, including the 4-speed models. Ensure your bell housing pattern matches before installation.
Q: What torque specifications should I use for the housing bolts?
A: For the CAP SCREW fasteners, apply 120 Nm (88 lb-ft) in a cross-tightening pattern. Always use new O-RING seals during reassembly.
Q: Can I rebuild my existing unit instead of buying this complete assembly?
A: While rebuilding is possible, the 4656.073.027 includes pre-assembled clutch packs and matched bearings. For severe wear, a complete unit often provides better reliability and lower labor costs than a field rebuild.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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