Overview
The ZF 4656.073.039 3 WG 171 Powershift Transmission Assembly is a complete, factory-matched unit designed 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 element of the WG 171 series, it manages torque distribution across three forward and three reverse speeds. The SKU 4656.073.039 replaces worn or damaged assemblies to restore original shift quality and load-holding capability. It interfaces directly with the 4656101028: TRANSMISSION HOUSING and the 4656301066: HOUS.FRONT SECT to form the complete gear train enclosure.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, internal clutch clearance increases, causing a noticeable lag or jarring shift when moving from neutral to forward or reverse.
- Intermittent gear slipping under load: Worn seals or scored clutch plates allow hydraulic pressure to bleed off, resulting in the transmission slipping during uphill climbs or heavy pulling.
- Contaminated transmission fluid: Debris from degrading friction material circulates through the system, often clogging the 4656201015: SCREEN SHEET and accelerating wear on other components.
- External fluid seepage at the bell housing: Deteriorated gaskets and O-rings around the assembly joints cause oil to weep onto the housing exterior, leaving visible drips after operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.073.039 |
| Assembly Type | 3 WG 171 Powershift Transmission (Complete Unit) |
| Overall Length (approx.) | 680 mm |
| Dry Weight (approx.) | 185 kg |
| Primary Material | High-strength cast iron housing with hardened steel gears |
| OEM Reference | ZF 3 WG 171 Series |
| Sealing Kit Reference | 0634313514: O-RING |
| Fastener Torque Spec | Use 0636100803: CAP SCREW (M10 x 1.5) |
Compatibility
This complete assembly is engineered for the ZF WG 171 transmission series. It is also mechanically compatible with the WG 180 and WG 200 series when used with the appropriate 4656301037: TUBE for hydraulic line routing. The unit fits models such as the 3 WG 171, 4 WG 180, and 3 WG 200 found in loaders, graders, and industrial tractors. Always verify the rear housing variant; the 4656301042: HOUSING REAR PART may require separate ordering for certain chassis configurations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural enclosure for gear sets and shafts |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting valve body from debris |
| 4656301037 | TUBE | Hydraulic fluid transfer tube between sections |
| 0634313514 | O-RING | Seals fluid passages between housing joints |
| 0636100803 | CAP SCREW | Fastener for securing housing sections |
| 4656301042 | HOUSING REAR PART | Rear housing section for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing assembly |
| 0636100801 | CAP SCREW | Fastener for clutch pack retention |
| 0636100160 | CAP SCREW | Fastener for valve body mounting |
Frequently Asked Questions
Q: Can the 4656.073.039 assembly be rebuilt, or must it be replaced as a unit?
A: While individual clutch packs and seals can be serviced, the complete assembly is balanced and pre-loaded at the factory. For consistent shift timing and load capacity, replacement with a new complete unit is recommended over field rebuilding.
Q: Does this assembly include the necessary O-rings and cap screws for installation?
A: The unit ships as a bare assembly. You will need to order the 0634313514: O-RING and 0636100803: CAP SCREW separately for a complete installation kit.
Q: How do I verify that this unit fits my WG 171 transmission?
A: Check the stamped serial number on your existing transmission housing. The 4656.073.039 is a direct replacement for all 3 WG 171 models. If your housing is a WG 180 variant, you will also need the 4656301042: HOUSING REAR PART to adapt the output flange.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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