Overview
The ZF 4657.055.127 5 WG 210 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty powershift transmissions in the WG 210 series. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control elements into a single, ready-to-install package. As a core assembly, it directly interfaces with the 4657101082: TRANSMISSION HOUSING to form the primary structural enclosure. The SKU 4657.055.127 denotes a factory-matched assembly, ensuring precise alignment of all internal rotating components for maximum torque capacity and shift quality in construction and material handling equipment.
Symptoms of Failure
When the ZF 4657.055.127 assembly begins to fail, operators typically notice these specific issues:
- Delayed or harsh gear engagement: A pronounced lag when shifting from neutral to forward or reverse, often accompanied by a jarring clunk, indicating worn clutch discs or hydraulic pressure loss within the assembly.
- Internal oil leaks pooling under the bell housing: Seepage from the main shaft seals or gasket interfaces between the assembly and the 4657201166: HOUS.FRONT SECT leads to low fluid levels and eventual transmission overheating.
- Gear slipping under load: The engine revs increase without a proportional increase in vehicle speed, particularly when climbing grades or carrying heavy loads, pointing to worn clutches or a failing torque converter lockup.
- Unusual whining or grinding noises: Metallic sounds from the transmission case, especially during deceleration, suggest bearing fatigue or gear tooth damage within the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.055.127 |
| Assembly Type | Complete Powershift Unit (5-speed) |
| Series | WG 210 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4657.055.127 |
| Fastener Torque (main housing bolts) | 120 Nm |
Compatibility
This complete unit is engineered for the ZF WG 210 series powershift transmissions. Based on its part number structure and physical dimensions, it is also compatible with the following ZF models that share the same bell housing pattern and input shaft spline count:
- WG 180 (with adapter plate modifications)
- WG 200 (direct fit for most variants)
- WG 210 (primary application)
- WG 250 (requires verification of output flange)
During installation, the assembly must be mated to the 4657201170: HOUSING REAR PART and the 4657298102: HOUSING REAR SECTION to complete the driveline connection. Always inspect the 4656301148: FIXING PLATE for wear during replacement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear housing section supporting output shaft bearings |
| 4657298102 | HOUSING REAR SECTION | End cover for rear housing, sealing oil passages |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M12 bolt for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (inner) |
| 4657301033 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (outer) |
| 0636100803 | CAP SCREW | M10 bolt for valve body attachment |
