Overview
The ZF 4656.027.001 6 WG 200 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway applications. This core assembly integrates the main gear cluster, clutch packs, and hydraulic control elements within a single, ready-to-install package. As the central power transfer module, it sits between the engine and the final drive, managing torque distribution across six forward speeds. The SKU 4656.027.001 is a direct OEM replacement for ZF WG 200 series transmissions, ensuring seamless integration with existing driveline components. For a full rebuild, this assembly must be mounted into a robust TRANSMISSION HOUSING to protect internal components from shock loads and contamination.
Symptoms of Failure
- Erratic gear engagement and slipping under load: When the 4656.027.001 assembly wears, internal clutch packs lose hydraulic pressure, causing the transmission to slip between gears, especially during uphill operation or heavy hauling.
- Delayed or harsh shifting: A failing unit often produces a noticeable lag when shifting from neutral to drive or between forward ranges, accompanied by a jarring engagement that indicates worn valve bodies or seal rings.
- Internal metallic noise and vibration: Worn bearings or planetary gear sets within the assembly generate a grinding or whining sound that increases with engine RPM, signaling imminent mechanical failure.
- External oil leaks near the bell housing: Degraded gaskets or cracked housing interfaces allow transmission fluid to escape, often pooling under the vehicle and leading to low fluid levels and overheating.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4656.027.001 |
| Assembly Type | Complete 6 WG 200 Powershift Unit |
| Weight (estimated) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4656.027.001 |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity | 18 liters (approx.) |
Compatibility
This complete unit is specifically engineered for the ZF WG 200 series, including the WG 200, WG 201, and WG 202 variants. It is also backward-compatible with select WG 180 models that share the same bell housing bolt pattern and input shaft spline count. When installing, ensure the HOUS.FRONT SECT is correctly aligned to the torque converter, and that the OIL TUBE is free of debris to maintain proper lubrication flow. For rearward mounting, the HOUSING REAR PART must be torqued to factory specifications to prevent misalignment of the output shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101023 | TRANSMISSION HOUSING | Main structural casing for the assembly |
| 4656201016 | HOUS.FRONT SECT | Front section housing torque converter interface |
| 4656301142 | OIL TUBE | Pressurized lubrication delivery channel |
| 4656201029 | HOUSING REAR PART | Rear housing for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 4656301148 | FIXING PLATE | Secures oil tube and prevents vibration |
| 0636102489 | CAP SCREW | High-tensile fastener for housing bolts |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump return |
| 0636100803 | CAP SCREW | M10 fastener for cover plate attachment |
