Overview
The ZF 4660.306.190 VALVE BLOCK is a precision hydraulic control component engineered for the WG92 and WG98 transmission series. This OEM genuine part, identified by SKU 4660.306.190, governs the directional flow of transmission fluid to modulate clutch engagement and gear shifts. Positioned within the lower valve body assembly, it interfaces directly with the 4660101017: TRANSMISSION HOUSING and the 4660301054: HOUSING II to ensure precise hydraulic circuit routing. Without this valve block, the transmission cannot maintain proper line pressure or execute shift timing.
Symptoms of Failure
- Erratic or delayed gear engagement — A worn valve block causes inconsistent hydraulic pressure, leading to harsh or slipping shifts, especially when the transmission is cold.
- Internal transmission oil leaks — Degraded sealing surfaces on the 4660.306.190 allow fluid to bypass, resulting in low fluid levels and visible drips near the valve body cover.
- Loss of reverse or forward drive — When the valve spools stick due to contamination, the transmission may fail to engage specific gears, triggering fault codes for pressure regulation.
- Overheating during heavy load operation — A malfunctioning valve block restricts oil flow to the cooler, causing rapid temperature spikes in WG92/WG98 units.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.306.190 |
| Material | High-strength aluminum alloy with anodized finish |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 85 mm x 45 mm |
| OEM Reference | ZF 4660.306.190 (Genuine) |
| Operating Pressure Range | 8–22 bar |
| Seal Type | Nitrile rubber (NBR) O-rings |
Compatibility
This valve block is specifically designed for the ZF WG92 and WG98 transmission families, which include the WG180, WG200, and WG210 models. It is also compatible with select WG150 variants that share the same hydraulic architecture. The 4660.306.190 mounts directly to the 0631306174: CYLINDRICAL PIN alignment dowels and is secured by 0636103273: CAP SCREW fasteners. Always verify the 0769123894: TYPE PLATE on your transmission to confirm model revision before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear and valve assembly |
| 4660301054 | HOUSING II | Secondary housing for valve block and oil channels |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise valve block positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports on the valve body |
| 4660221029 | SUCTION TUBE | Draws oil from the pan to the pump inlet |
| 0634100317 | O-RING | Seals valve block to housing interface |
| 0636103273 | CAP SCREW | Fastens valve block to transmission housing |
| 0634306311 | O-RING | Seals suction tube connection |
| 4660321029 | FIXING PLATE | Retains valve block against vibration |
