Overview
The ZF 6006.020.034 FS SG 4 for WG200 is a precision-engineered OEM genuine component designed for the internal shift mechanism of ZF WG200 series transmissions. This part, identified by SKU 6006.020.034, functions as a critical selector sleeve or synchronizer assembly within the transmission’s hydraulic control unit. It ensures precise gear engagement and disengagement by directing hydraulic pressure to the correct clutch pack. When installed alongside a robust TRANSMISSION HOUSING (4644101216) or a TRANSMISSION HOUSING (4644301223), this part maintains the structural integrity required for heavy-duty industrial applications. The 6006.020.034 is a direct replacement for worn shift components, restoring factory-specified shift timing and preventing internal cross-leakage.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 6006.020.034 wears, operators often experience a noticeable lag or a jarring shift when moving between forward and reverse gears, particularly under load.
- Intermittent loss of drive: A worn selector sleeve can cause the transmission to momentarily slip out of gear during operation, leading to sudden RPM surges without corresponding vehicle movement.
- Hydraulic fluid contamination: Degradation of this part generates metallic debris in the transmission fluid, which can be detected during routine oil analysis and often accompanies a failing O-RING (0634306525).
- Audible grinding noise during shifts: A distinct metallic grinding sound, especially when shifting from neutral to a drive range, indicates that the synchronizer surfaces on the 6006.020.034 have worn beyond tolerance.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6006.020.034 |
| Material | Hardened alloy steel with surface nitriding |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 68 mm |
| Inner Diameter | 32 mm |
| Height | 45 mm |
| OEM Reference | ZF FS SG 4 for WG200 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 6006.020.034 component is specifically engineered for the WG200 series transmissions. It is also compatible with the WG180 series when used with the correct GROOVED STUD (0631311009) for alignment. The part fits WG200, WG180, and select WG160 variants that utilize the FS SG 4 shift module. Always verify the TYPE PLATE (0730365067) on your transmission housing to confirm exact model designation before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301223 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for shift mechanism |
| 4644303060 | COVER PLATE | Seals the shift module access port |
| 4644303061 | COVER PLATE | Alternate cover plate with gasket groove |
| 0634306525 | O-RING | Hydraulic seal for shift piston bore |
| 0636305026 | SCREW PLUG | Seals hydraulic test ports |
| 4644301279 | SCREEN SHEET | Filter mesh for hydraulic fluid intake |
| 4644301088 | SEALING CAP | Protects exposed hydraulic ports |
