Overview
The ZF 0501.325.280 SOLENOID VALVE is a precision electro-hydraulic actuator engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part modulates oil flow to control clutch pack engagement and shift timing within the valve body assembly. As a critical component of the transmission’s hydraulic control unit, the SKU 0501.325.280 directly influences shift quality and torque converter lockup. When paired with a properly functioning DIFFERENTIAL and TAPER ROLLER BEARING, this solenoid ensures smooth power delivery under heavy load conditions.
Symptoms of Failure
- Delayed or harsh shifting: A worn solenoid fails to regulate hydraulic pressure, causing abrupt gear engagement or hesitation between ratios.
- Transmission slipping in higher gears: Insufficient valve response leads to clutch pack slippage, especially during uphill climbs or towing.
- Erratic torque converter lockup: The solenoid’s inability to maintain steady pressure results in shuddering or failure to lock the converter at highway speeds.
- Oil contamination in the valve body: Debris from a failing solenoid can migrate into the DIFFERENTIAL HOUSING, accelerating wear on adjacent components.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0501.325.280 |
| Coil Resistance | 12.5 Ω ± 0.5 Ω |
| Operating Pressure | 8–18 bar |
| Body Material | Hard-anodized aluminum |
| Seal Material | Nitrile rubber (NBR) |
| Weight | 0.28 kg |
| Thread Size | M12 x 1.5 |
Compatibility
This solenoid valve is specifically designed for ZF WG100, WG130, and WG131 transmissions found in medium-duty trucks, buses, and construction equipment. It also fits select WG180 and WG200 variants when used in conjunction with the correct DIFFERENTIAL adapter kit. Always verify your transmission model code against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shaft assemblies |
| 2093209023 | DIFFERENTIAL | Provides final drive ratio reduction |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Secures solenoid mounting bracket |
| 5838300811 | THRUST WASHER | Reduces axial friction in planetary gear sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to differential side gears |
| 5838300633 | AXLE | Transmits rotational force to wheel hubs |
| 5838300753 | THRUST WASHER | Prevents axial play in output shaft |
| 5838300818 | THRUST WASHER | Spacer for differential pinion gears |
Frequently Asked Questions
Q: Can I install this solenoid without removing the transmission?
A: Yes, the 0501.325.280 is accessible after draining the fluid and removing the valve body cover. However, we recommend replacing the SPRING PIN and all O-rings during service.
Q: What causes premature solenoid failure in WG130 transmissions?
A: Contaminated transmission fluid is the primary cause. Metal particles from a worn AXLE BEVEL GEAR or degraded THRUST WASHER can clog the solenoid’s internal screen.
Q: Does this part include the mounting hardware?
A: No, the solenoid is sold as a bare unit. You will need the AXLE retaining bolts and THRUST WASHER set for complete reassembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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