Overview
The ZF 0501.326.260 VALVE BODY is a precision hydraulic control unit that directs oil flow to actuate clutch packs and shift solenoids within the WG100, WG130, and WG131 transmission series. As an OEM genuine part, it ensures exact OEM-specified shift timing and pressure regulation. This valve body, identified by SKU 0501.326.260, mounts directly onto the main 4663101001: HOUSING and is sealed by the 4663301025: COVER. It is secured using 0636100817: CAP SCREW fasteners and aligned with a 0631306816: CYLINDRICAL PIN to maintain precise bore alignment.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn spools or clogged passages cause erratic clutch fill times, leading to a noticeable lag when shifting from Neutral to Drive or Reverse.
- Transmission oil leaks at the valve body interface: Degraded gaskets or cracked bores allow ATF to seep past the 0634303928: O-RING seals, leaving puddles under the vehicle.
- Intermittent gear slipping under load: Internal cross-leakage reduces line pressure, causing the transmission to slip during acceleration or uphill driving.
- Erratic shift patterns or limp mode: Faulty solenoid feedback or stuck valves trigger diagnostic trouble codes, forcing the transmission into a safe mode.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0501.326.260 |
| Material | Die-cast aluminum alloy (anodized) |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 310 mm x 180 mm x 65 mm |
| OEM Reference | ZF 0501.326.260 |
| Operating Pressure Range | 5–18 bar |
| Fluid Compatibility | ZF TE-ML 04/09/14 approved ATF |
Compatibility
This valve body is engineered for the ZF WG100, WG130, and WG131 off-highway transmission families. It is also compatible with select WG180 and WG200 variants that share the same hydraulic control architecture. Always verify the casting number on your original valve body before ordering. The assembly integrates with the 4656301148: FIXING PLATE and uses 0636611009: STUD fasteners for secure mounting. Seal integrity is maintained by the 0634303928: O-RING and 0634303266: O-RING, while pressure test ports are sealed with 4475280099: SCREW PLUG and 4475280018: SCREW PLUG.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4663101001 | HOUSING | Main structural carrier for valve body assembly |
| 4663301025 | COVER | Seals and protects valve body channels |
| 0631306816 | CYLINDRICAL PIN | Aligns valve body to housing bores |
| 0636100817 | CAP SCREW | Secures valve body to housing |
| 4656301148 | FIXING PLATE | Reinforces valve body mounting |
| 0636611009 | STUD | Threaded fastener for cover attachment |
| 0634303928 | O-RING | Seals valve body-to-housing interface |
| 4475280099 | SCREW PLUG | Closes pressure test ports |
| 0634303266 | O-RING | Seals screw plug threads |
| 4475280018 | SCREW PLUG | Alternate port sealing plug |
