Overview
The ZF 4657.066.026 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully assembled, direct-replacement gearbox core designed for heavy-duty off-highway machinery. This complete unit integrates the main drive housing, clutch packs, and hydraulic control components into a single, ready-to-install assembly. As the central power transfer module in the WG 211 series, it manages torque distribution across six forward speeds and one reverse. The SKU 4657.066.026 is the definitive identifier for this complete assembly, ensuring precise fitment when rebuilding or replacing a worn transmission. For structural integrity, this unit mates with the 4657101049: TRANSMISSION HOUSING and is sealed by the 4657301130: HOUS.FRONT SECT and the 4657301131: HOUSING REAR PART, all of which must be aligned using the 0631306816: CYLINDRICAL PIN for precise dowel alignment.
Symptoms of Failure
- Delayed or harsh engagement: When the complete unit loses internal hydraulic pressure, operators notice a pronounced lag when shifting from neutral to forward or reverse, often accompanied by a jarring clunk.
- Torque converter shudder under load: A rhythmic vibration during low-speed, high-torque operation indicates worn clutch discs or degraded seals within the assembly.
- External oil seepage at housing joints: Cracks or warpage in the main casing lead to fluid weeping around the mating surfaces, particularly where the front and rear sections join.
- Intermittent gear slipping: The transmission unexpectedly drops out of gear during uphill travel, a classic sign of failing piston seals or a compromised valve body in the complete unit.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.066.026 |
| Assembly Type | Complete Powershift Unit (6 WG 211) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel |
| Max Input Torque | 1,200 Nm |
| Speed Configuration | 6 forward / 1 reverse |
| OEM Reference | ZF WG 211 Series |
Compatibility
This complete unit is engineered specifically for the ZF WG 211 transmission series. It is also a direct fit for the WG 180 and WG 200 series when used in telehandlers, wheel loaders, and industrial forklifts from manufacturers such as Manitou, JCB, and Linde. The assembly is not backward-compatible with older WG 120 or WG 150 models without significant adapter modifications. Always verify the housing casting number against the 4657101049: TRANSMISSION HOUSING to confirm compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657301130 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4657301131 | HOUSING REAR PART | Rear section housing for output shaft and PTO mount |
| 0631306816 | CYLINDRICAL PIN | Dowel pin for precise alignment of housing sections |
| 0636102489 | CAP SCREW | M12 bolt for securing housing flanges |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 0636102463 | CAP SCREW | M10 bolt for valve body attachment |
| 4657201133 | SCREEN SHEET | Fine mesh filter for hydraulic oil circuit |
| 0636115287 | CAP SCREW | M8 bolt for oil pan fastening |
| 4657301065 | PLATE | Spacer plate for clutch pack preload adjustment |
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