Overview
The ZF 4661.004.014 4 WG 94 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 train, clutch packs, and hydraulic control elements within a single, pre-tested assembly. As a core component of the WG 94 Series, it manages torque distribution and gear ratio changes under load, ensuring smooth power delivery in wheel loaders and industrial vehicles. The SKU 4661.004.014 is the definitive identifier for this specific assembly, guaranteeing exact fitment without modification.
Symptoms of Failure
When the ZF 4661.004.014 assembly begins to fail, operators typically notice these specific issues:
- Delayed or harsh gear engagement: A noticeable lag when shifting from forward to reverse, often accompanied by a clunking sound, indicates internal clutch wear or hydraulic pressure loss.
- Transmission overheating under light load: If the unit runs hotter than normal during routine operation, it suggests internal seal degradation or worn bearings causing excessive friction.
- Torque converter shudder at low RPM: A vibration or shudder when accelerating from a stop points to failing stator or turbine components within the assembly.
- External oil seepage from housing joints: Visible fluid leaks around the main case seams often originate from degraded gaskets or cracked castings, requiring immediate inspection.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.004.014 |
| Assembly Type | Complete Powershift Unit (4 WG 94) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4661.004.014 |
| Type Plate | 0769123894: TYPE PLATE |
| Sealing Plug | 0750100022: SCREW PLUG |
| Secondary Plug | 0636302602: SCREW PLUG |
| Seal Ring | 0634100633: O-RING |
| Lubrication Nozzle | 4661301029: NOZZLE |
| Secondary Nozzle | 4661301027: NOZZLE |
Compatibility
This complete unit is engineered specifically for the ZF WG 94 Series of powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG210, which are commonly found in articulated dump trucks, wheel loaders, and telehandlers. The assembly also integrates with earlier WG 94 variants where the bell housing pattern and input shaft spline count match the 4661.004.014 specification. Always verify the serial number on your existing unit against the OEM data plate before ordering.
During installation, the 4661.004.014 assembly must be paired with a robust 4661101028: TRANSMISSION HOUSING to secure the gear train. The internal oil galleries are sealed by the 4661301049: HOUSING II, which also supports the clutch piston assembly. A critical lubrication feed is provided by the 4661301093: TUBE, while the 0631306174: CYLINDRICAL PIN ensures precise alignment of the valve body during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101028 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301049 | HOUSING II | Secondary housing for clutch pack retention |
| 4661301093 | TUBE | Oil delivery conduit for clutch lubrication |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for valve body positioning |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 0636302602 | SCREW PLUG | Secondary sealing plug for drain ports |
| 0634100633 | O-RING | Hydraulic seal between housing sections |
| 4661301029 | NOZZLE | Directs oil spray to gear mesh points |
| 4661301027 | NOZZLE | Secondary lubrication jet for bearings |
