Overview
The ZF 4656.073.012 3 WG 171 Powershift Transmission Assembly is a complete, remanufactured unit engineered for heavy-duty off-highway applications. This assembly integrates the clutch packs, planetary gearsets, and hydraulic control system into a single, ready-to-install package. As a core component of the WG 171 series, it is designed to deliver smooth, reliable power shifts under extreme load conditions. The SKU 4656.073.012 is a direct replacement for OEM units, ensuring precise fitment and performance. This assembly sits at the heart of the drivetrain, managing torque distribution between the engine and final drives in wheel loaders, dozers, and graders.
Symptoms of Failure
When the ZF 4656.073.012 assembly begins to fail, operators typically notice gear slipping under load, particularly when shifting between forward and reverse. Another common symptom is delayed engagement when moving from neutral into a drive gear, often accompanied by a harsh clunk. Internal oil leaks may manifest as low transmission fluid levels without external puddles, leading to overheating. Finally, erratic shifting or loss of power in specific ranges indicates worn clutch packs or valve body issues within the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4656.073.012 |
| Assembly Type | 3 WG 171 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | High-strength cast iron |
| Overall Length (approx.) | 620 mm |
| Overall Width (approx.) | 480 mm |
| Overall Height (approx.) | 510 mm |
| OEM Reference | ZF WG 171 Series |
| Sealing Kit Reference | 0634313514: O-RING |
| Fastener Reference | 0636100803: CAP SCREW |
Compatibility
This complete unit is specifically designed for the ZF WG 171 transmission series. It is also compatible with select variants of the WG 180 and WG 200 series when used with the appropriate adapter housings. The assembly directly replaces units in ZF 3 WG 171 models found in Caterpillar, Volvo, and Komatsu equipment. Always verify the serial number range of your existing transmission against the SKU 4656.073.012 to ensure correct fitment.
Related Components
During installation of the 4656.073.012 assembly, several companion parts must be inspected or replaced. The TRANSMISSION HOUSING provides the structural foundation for the unit. The HOUS.FRONT SECT seals the front of the gear train, while the SCREEN SHEET filters hydraulic fluid entering the pump. Additionally, the TUBE directs lubrication oil to critical bearings. Below is a full list of associated parts for this assembly.
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4656201015 | SCREEN SHEET | Fine mesh filter for hydraulic oil intake |
| 4656301037 | TUBE | Lubrication oil delivery tube to planetary gears |
| 0634313514 | O-RING | Seals hydraulic passages between housing sections |
| 0636100803 | CAP SCREW | M10 fastener for securing housing flanges |
| 4656301042 | HOUSING REAR PART | Rear section housing for output shaft and PTO |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | M8 fastener for valve body attachment |
| 0636100160 | CAP SCREW | M16 fastener for main housing bolts |
Frequently Asked Questions
Q: Can the 4656.073.012 assembly be rebuilt, or is it only sold as a complete unit?
A: This SKU is sold as a complete, pre-assembled unit. However, individual internal components such as the HOUSING REAR PART and O-RING are available separately for field repairs.
Q: What is the typical lifespan of this transmission assembly under normal operating conditions?
A: With proper maintenance and clean hydraulic fluid, the 3 WG 171 assembly often exceeds 8,000 operating hours. Regular replacement of the SCREEN SHEET and CAP SCREW fasteners during rebuilds is recommended.
Q: Does this unit include the torque converter?
A: No, the 4656.073.012 is the transmission assembly only. The torque converter is a separate component that mounts to the HOUS.FRONT SECT.
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