Overview
The ZF 4657.084.301 4 WG 230 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in replacement for heavy-duty powershift drivelines. As the core rotating assembly in the WG 230 series, this complete unit houses the planetary gear sets, clutch packs, and hydraulic control valves that modulate torque distribution under load. The SKU 4657.084.301 designates a factory-balanced assembly ready for direct installation into compatible ZF off-highway transmissions. This unit interfaces directly with the TRANSMISSION HOUSING and is secured by the HOUS.FRONT SECT and HOUSING REAR PART to form a sealed, pressurized oil circuit.
Symptoms of Failure
- Erratic gear engagement under load: When the 4 WG 230 assembly loses internal seal integrity, operators report delayed or harsh shifting during grading or dozing operations.
- Persistent hydraulic oil leaks at the bell housing: Worn gaskets or cracked planetary carriers allow transmission fluid to weep past the HOUSING REAR SECTION, leaving puddles under the machine.
- Torque converter shudder at low RPM: Internal wear in the clutch packs causes vibration during inching maneuvers, often misdiagnosed as engine trouble.
- Complete loss of forward or reverse: A seized bearing or broken sun gear within this assembly results in a driveline that spins freely without engaging the output shaft.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.084.301 |
| Assembly Type | Complete Powershift Unit (4-speed) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 2,300 Nm |
| OEM Reference | ZF WG 230 Series |
| Fastener Torque Spec | M16 cap screws: 210 Nm (use CAP SCREW 0636100801) |
| Sealing Kit | Includes CYLINDRICAL PIN 0631306816 |
Compatibility
This complete unit is engineered for the ZF WG 230 series but shares mounting patterns with the WG 180 and WG 200 families when paired with the correct FIXING PLATE. It is commonly found in Case IH, New Holland, and JCB telehandlers and wheel loaders from the 2000–2015 production era. Always verify the rear housing variant: units requiring the HOUS.FRONT SECT (4657201161) or HOUSING REAR PART (4657201162) may need additional adapter plates. For oil filtration, the SCREEN SHEET 4657301032 and SCREEN SHEET 4657301033 are recommended replacements during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101085 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201161 | HOUS.FRONT SECT | Front adapter housing for torque converter |
| 4657201162 | HOUSING REAR PART | Rear section enclosing output shaft |
| 4657298107 | HOUSING REAR SECTION | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M16 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston |
| 4657301032 | SCREEN SHEET | Fine mesh oil filter (primary) |
| 4657301033 | SCREEN SHEET | Fine mesh oil filter (secondary) |
| 0636100803 | CAP SCREW | M12 fastener for valve body |
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