Overview
The ZF 0501.225.026 SOLENOID VALVE is a critical electro-hydraulic actuator responsible for modulating oil flow within the WG260 and WG310 transmission valve bodies. This OEM genuine part precisely controls clutch and brake application pressures, ensuring smooth gear shifts and consistent torque converter lock-up. As a direct replacement for the factory-installed unit, the SKU 0501.225.026 interfaces directly with the transmission’s control unit to regulate hydraulic circuits. It is housed within the main valve body assembly, which is secured by the TRANSMISSION HOUSING (4646101147) and protected by the COVER (4646301301).
Symptoms of Failure
- Delayed or harsh shifting: A failing solenoid valve causes erratic pressure regulation, leading to noticeable hesitation or jarring engagement between gears.
- Transmission fluid leaks around the valve body: Worn O-rings or internal seal degradation on the 0501.225.026 can result in external oil seepage, often visible near the HOUSING (4646301318).
- Intermittent gear slippage under load: When the solenoid fails to hold pressure, the transmission may momentarily lose drive in forward or reverse gears, especially during uphill climbs.
- Check engine or transmission warning light: The control unit detects abnormal electrical resistance or stuck valve positions, triggering diagnostic trouble codes related to shift solenoid performance.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (OEM) | 0501.225.026 |
| Material | Hardened steel spool with anodized aluminum body |
| Weight | 0.35 kg (0.77 lbs) |
| Dimensions (L x W x H) | 85 mm x 45 mm x 40 mm |
| Operating Voltage | 12V DC (PWM controlled) |
| Seal Type | Nitrile rubber O-rings (included) |
| OEM Reference | ZF 0501.225.026 |
Compatibility
This solenoid valve is engineered for the ZF WG series of powershift transmissions. It is a direct fit for the WG260 and WG310 series, commonly used in heavy-duty construction and agricultural equipment. Based on its hydraulic flow characteristics, the 0501.225.026 is also compatible with the WG180 and WG200 models, provided the valve body configuration matches. For proper installation, ensure the mating surface on the COVER SHEET (4646201032) is clean and free of debris.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101147 | TRANSMISSION HOUSING | Encloses the gear train and valve body assembly |
| 4646301318 | HOUSING | Supports the solenoid valve and hydraulic circuits |
| 4646301301 | COVER | Seals the valve body and prevents contamination |
| 4646201032 | COVER SHEET | Gasket layer between housing and cover |
| 4646301341 | COVER SHEET | Alternate gasket for revised valve body designs |
| 0636115293 | 螺栓 | Fastener for securing the solenoid bracket |
| 0501316470 | BREATHER | Equalizes internal transmission pressure |
| 4646201021 | BREATHER | Ventilation cap for the housing |
| 0736300232 | 螺栓 | Mounting bolt for the cover assembly |
| 4646164011 | CONTROL UNIT | Electronic module that commands the solenoid valve |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
