Overview
The ZF 4660.134.004 CONVERTER Powershift Transmission Assembly is a complete, ready-to-install unit designed for heavy-duty industrial applications within the WG 98 Series. This assembly integrates the torque converter and gear train into a single, sealed module, ensuring efficient power transfer and smooth shifting under high load conditions. The SKU 4660.134.004 serves as the core hydraulic and mechanical heart of the transmission, converting engine torque into usable hydraulic power for forward and reverse motion. It sits directly between the engine flywheel and the main gear housing, requiring precise alignment with the 4660101017 TRANSMISSION HOUSING and the 4660301054 HOUSING II to maintain oil circulation and structural integrity.
Symptoms of Failure
- Delayed or harsh engagement: When the converter assembly wears, you may experience a noticeable lag between shifting and actual gear engagement, often accompanied by a jarring clunk. This is a common “ZF transmission slipping” issue.
- Torque converter shudder: A persistent vibration or shudder during low-speed acceleration or under load indicates internal clutch pack or stator failure within the 4660.134.004 unit.
- External oil leaks near the bell housing: Worn seals or a cracked converter housing can cause transmission fluid to pool around the front of the unit, leading to low fluid levels and overheating. Check the 0631306174 CYLINDRICAL PIN for alignment issues that may exacerbate leaks.
- Overheating transmission fluid: A failing converter cannot properly dissipate heat, causing the transmission to run hot and potentially damaging the 0769123894 TYPE PLATE and internal seals.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.134.004 |
| Assembly Type | Complete Converter & Powershift Unit |
| Overall Length (approx.) | 420 mm |
| Dry Weight (approx.) | 68 kg (150 lbs) |
| Housing Material | High-strength cast iron |
| Torque Capacity | Up to 1800 Nm |
| OEM Reference | ZF WG 98 Series |
| Seal Type | Viton O-rings (see 0634100317 O-RING and 0634306311 O-RING) |
| Fastener Spec | M12 x 1.5 cap screws (see 0636103273 CAP SCREW) |
| Included Components | Converter, clutch packs, valve body |
Compatibility
This 4660.134.004 assembly is specifically engineered for the ZF WG 98 Series powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG211 used in wheel loaders, forklifts, and industrial tractors. The unit also shares mounting patterns with the WG 98 variants found in older ZF drivelines. For proper installation, ensure the 4660221029 SUCTION TUBE and 4660321029 FIXING PLATE are correctly aligned to prevent cavitation. Always verify your transmission serial number against the WG 98 series compatibility list before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301054 | HOUSING II | Secondary housing for converter support |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification and specification label |
| 0750100022 | SCREW PLUG | Seals oil passages and drain ports |
| 4660221029 | SUCTION TUBE | Oil pickup line from pan to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing assembly |
| 0634306311 | O-RING | Seals cap screw and plug interfaces |
| 4660321029 | FIXING PLATE | Retains converter assembly in position |
