Overview
The ZF 6006.031.004 FS D 9 is a critical control component engineered specifically for the WG201 and WG210 series transmissions. This OEM genuine part functions as a selector or actuation element within the valve body assembly, directly managing hydraulic pressure distribution to engage clutch packs and gear sets. By precisely directing oil flow, it ensures smooth shift transitions and consistent torque delivery under heavy-duty industrial loads. The SKU 6006.031.004 is manufactured to ZF’s exacting tolerances, guaranteeing a direct replacement without modification. When paired with a robust TRANSMISSION HOUSING (4644101203) or a TRANSMISSION HOUSING (4644301382), this part forms the backbone of reliable power transmission in construction and agricultural machinery.
Symptoms of Failure
When the ZF 6006.031.004 begins to degrade, operators typically notice three to four distinct failure indicators. First, erratic or delayed gear engagement occurs as hydraulic circuits lose pressure integrity, causing hesitation when shifting from neutral to drive. Second, intermittent gear slipping under load becomes apparent, particularly when climbing grades or hauling heavy payloads. Third, internal transmission fluid contamination may accelerate, as worn sealing surfaces allow debris to circulate. Fourth, audible clicking or grinding noises from the valve body area signal mechanical fatigue. These symptoms often worsen if the surrounding THREADED BUSH (4644301189) or SCREW PLUG (0636302005) are not inspected simultaneously.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6006.031.004 |
| OEM Reference | ZF FS D 9 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 38 mm |
| Height | 28 mm |
| Operating Pressure | 12-18 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This genuine ZF component is primarily designed for the WG201 and WG210 transmission series, which are widely used in forklifts, wheel loaders, and telehandlers. It also fits select variants of the WG180, WG200, and WG211 models where the valve body architecture shares the same porting and mounting pattern. Always verify the transmission serial number against the ZF parts catalog to ensure correct fitment. For complete assembly integrity, consider replacing the O-RING (0634306198) and SEALING RING (0634801098) during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Encloses and supports gear train and valve body |
| 4644301382 | TRANSMISSION HOUSING | Alternative housing for WG210 series |
| 4644301189 | THREADED BUSH | Provides threaded anchor point for hydraulic lines |
| 0636302005 | SCREW PLUG | Seals oil passages during maintenance |
| 0634306198 | O-RING | Prevents fluid leaks at mating surfaces |
| 0634801098 | SEALING RING | Ensures pressure-tight connection on ports |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures valve body components in alignment |
| 4644301161 | COVER PLATE | Protects internal valve mechanism from debris |
| 0636100621 | HEXAGON SCREW | Fastens housing and cover assemblies |
