Overview
The ZF 4660.003.012 WG 98 Powershift Transmission Assembly is a complete, ready-to-install unit engineered for heavy-duty industrial applications. As the core drivetrain component in the WG 98 Series, this assembly integrates the main gear cluster, clutch packs, and hydraulic control circuits to deliver seamless power modulation under load. The SKU 4660.003.012 is specifically designed to replace worn or failed complete assemblies, ensuring minimal downtime for construction, mining, and agricultural machinery. This unit interfaces directly with the 4660101017: TRANSMISSION HOUSING and the 4660301054: HOUSING II to form a sealed, pressurized oil bath system that protects internal gears from thermal stress.
Symptoms of Failure
When the ZF 4660.003.012 WG 98 assembly begins to degrade, operators typically notice three distinct failure modes. First, erratic gear engagement under load—often described as “hunting” between forward and reverse—indicates worn clutch discs or hydraulic seal leakage. Second, persistent oil seepage from the bell housing or output flange area suggests a compromised main seal or cracked housing, which can be confirmed by inspecting the 0631306174: CYLINDRICAL PIN alignment. Third, a high-pitched whine or grinding noise during deceleration points to bearing fatigue or gear tooth pitting. Fourth, delayed engagement after shifting—taking more than two seconds to respond—signals a failing torque converter or low hydraulic pressure, often traced to a damaged 0769123894: TYPE PLATE that misdirects oil flow.
Technical Specifications
| Parameter | Specification |
|---|---|
| Assembly Weight | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Input Torque Capacity | 1,200 Nm |
| Housing Material | Cast Iron (GGG-40) |
| Oil Capacity | 14.5 liters |
| OEM Reference | ZF 4660.003.012 |
| Max Operating Pressure | 18 bar |
| Clutch Pack Count | 6 (3 forward, 3 reverse) |
Compatibility
This complete assembly is engineered for the ZF WG 98 Series, which includes the WG180, WG200, and WG250 transmission models commonly found in Volvo, Caterpillar, and Liebherr wheel loaders. It also fits select WG 100 variants used in telescopic handlers and graders. The 4660.003.012 unit is not backward-compatible with older WG 80 series without modifying the 4660101017: TRANSMISSION HOUSING mounting points. For precise fitment, always cross-reference the serial number on your existing 0769123894: TYPE PLATE against the OEM parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4660301054 | HOUSING II | Secondary housing for output shaft and bearing support |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification plate with serial number and specs |
| 0750100022 | SCREW PLUG | Seals oil drain and fill ports |
| 4660221029 | SUCTION TUBE | Draws oil from sump to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing sections together |
| 0634306311 | O-RING | Seals cap screw threads against oil leakage |
| 4660321029 | FIXING PLATE | Locks clutch pack adjustment nuts |
