Overview
This complete ZF 4656.073.035 3 WG 171 Powershift Transmission Assembly is a fully integrated drop-in unit designed for heavy-duty off-highway applications. As the core of the WG 171 series, this assembly manages torque distribution across three forward speeds and one reverse range, ensuring precise power delivery under extreme loads. The SKU 4656.073.035 replaces the entire rotating assembly, including the clutch packs, planetary gearsets, and valve body components. It sits directly between the engine bellhousing and the final drive, interfacing with the TRANSMISSION HOUSING to seal the internal oil circuits and support the main shaft.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, operators report a noticeable lag between shifting and gear engagement, often accompanied by a jarring clunk. This is a common sign of worn clutch discs or degraded sealing rings inside the 4656.073.035 unit.
- Internal oil leaks at the housing interface: A failing assembly can cause fluid seepage where the main body meets the HOUS.FRONT SECT. Look for oil drips on the bellhousing or around the front seal area.
- Gear slipping under load: As the internal clutches lose friction material, the transmission will slip when climbing grades or pushing heavy loads. This often triggers fault codes for pressure loss in the main circuit.
- Contaminated oil with metallic debris: Worn bearings or planetary gears shed fine metal particles that clog the SCREEN SHEET, reducing lubrication flow and accelerating further damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4656.073.035 |
| Assembly Type | Complete Powershift Unit (3 WG 171) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 3 WG 171 |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity (assembly) | 14.5 liters |
| Related Seal Kit | 0634313514: O-RING |
| Mounting Hardware | 0636100803: CAP SCREW (x8) |
Compatibility
This 4656.073.035 assembly is engineered for the ZF WG 171 series, but it also shares mounting patterns and hydraulic circuits with the WG 180 and WG 200 families. It is a direct fit for ZF 3 WG 171 transmissions used in telescopic handlers, wheel loaders, and rough-terrain forklifts from manufacturers such as Liebherr, JCB, and Manitou. For rear-section repairs, pair this unit with the HOUSING REAR PART to maintain proper shaft alignment. Always verify the bellhousing bolt pattern against your existing TUBE assembly before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses the gearset and oil sump. |
| 4656301066 | HOUS.FRONT SECT | Front section housing that supports the input shaft and pump drive. |
| 4656201015 | SCREEN SHEET | Fine-mesh filter that protects the valve body from debris. |
| 4656301037 | TUBE | Oil delivery tube connecting the pump to the clutch circuits. |
| 0634313514 | O-RING | Seals the housing joints to prevent external oil leaks. |
| 0636100803 | CAP SCREW | M10 bolt used to secure the front housing to the main case. |
| 4656301042 | HOUSING REAR PART | Rear housing that contains the output shaft bearing and seal. |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-housing registration. |
| 0636100801 | CAP SCREW | M12 bolt for the rear housing attachment. |
| 0636100160 | CAP SCREW | M8 bolt for the screen sheet cover plate. |
Frequently Asked Questions
Q: Can I install the 4656.073.035 assembly without replacing the TRANSMISSION HOUSING?
A: Yes, provided the housing is free of cracks and the bearing bores are within spec. However, we strongly recommend inspecting the TRANSMISSION HOUSING for wear at the same time, as a damaged housing will compromise the new assembly’s alignment.
Q: What is the typical service life of this complete unit?
A: In normal off-highway use with proper oil changes every 500 hours, the 4656.073.035 assembly typically lasts 8,000–10,000 hours. Premature failure is often linked to a clogged SCREEN SHEET, so always replace that filter during installation.
Q: Does this assembly include the O-rings and cap screws?
A: No, the 4656.073.035 is supplied as a bare assembly. You will need to order the 0634313514: O-RING kit and 0636100803: CAP SCREW set separately to complete the installation.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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