Overview
The ZF 4656.073.313 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As a full replacement for the WG 171 series, the SKU 4656.073.313 eliminates the need for piecemeal repairs, restoring full power flow from the torque converter to the output shaft. It sits at the heart of the drivetrain, directly coupling engine torque to the final drives in loaders, graders, and industrial tractors.
Symptoms of Failure
- Delayed or harsh shifting under load: When the internal clutch packs or seals degrade, the transmission hesitates before engaging gears, often accompanied by a jarring shift. This symptom typically worsens as hydraulic pressure drops.
- Torque converter shudder at low RPM: A vibrating or chattering sensation during inching or low-speed maneuvering indicates worn stator components or damaged friction discs within the assembly.
- External oil leaks near the bell housing: Cracks in the TRANSMISSION HOUSING or degraded gaskets allow ATF to escape, leaving visible drips after shutdown.
- Loss of power in forward gears: Slipping under acceleration, particularly in higher ranges, points to worn piston seals or a failing valve body within the 3 WG 171 assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.073.313 |
| Series | WG 171 (3-speed Powershift) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 3 WG 171 |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
| Bolt Torque (housing) | 120 Nm (use CAP SCREW 0636100803) |
| Seal Kit Required | O-RING 0634313514 |
Compatibility
This complete unit is engineered for the ZF WG 171 series, but its core architecture shares hydraulic and mechanical interfaces with the WG 180 and WG 200 families. It is a direct fit for ZF 3 WG 171 applications found in Volvo BM L70, Case 821, and Caterpillar 924G loaders. The assembly also retrofits into certain WG 160 models when paired with the correct HOUS.FRONT SECT adapter. Always verify bell housing bolt patterns before installation.
During rebuild, technicians must inspect the SCREEN SHEET for debris and replace the TUBE if scoring is present. These components work in concert with the main assembly to maintain proper lubrication and filtration.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101072 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656301168 | HOUS.FRONT SECT | Front section housing the pump drive |
| 4656201015 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301037 | TUBE | Oil delivery tube to clutch packs |
| 0634313514 | O-RING | Seals housing joints against leaks |
| 0636100803 | CAP SCREW | M12 bolt for housing fastening |
| 4656301169 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | M10 bolt for valve body mounting |
| 0636100160 | CAP SCREW | M8 bolt for oil pan retention |
Frequently Asked Questions
Q: Can the 4656.073.313 assembly be installed without removing the cab?
A: In most wheel loaders, the complete unit requires cab removal or tilting for access. However, on certain graders with drop-box designs, the assembly slides out from underneath. Always consult your machine’s service manual for clearance dimensions.
Q: Does this unit include the torque converter?
A: No, the 4656.073.313 is the transmission assembly only (gears, clutches, valve body). The torque converter is sold separately. You will need to reuse your existing converter or order a matching ZF unit.
Q: What is the recommended break-in procedure after installation?
A: Run the transmission in neutral for 5 minutes at idle to prime all circuits. Then perform 10 low-load shifts through all ranges before applying full working load. Change the filter and fluid after the first 50 hours of operation.
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Phone: +86 158 2286 3467 |
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