Overview
The ZF WG 310 is a critical hydraulic control valve assembly engineered specifically for the modulation and distribution of transmission fluid within ZF’s heavy-duty powershift gearboxes. Positioned as the primary interface between the electronic control unit and the clutch packs, this component precisely regulates line pressure to ensure smooth gear engagement under extreme torque loads. The SKU WG 310 is manufactured to OEM tolerances, utilizing a hardened spool and precision-machined bore to minimize internal leakage. When installed correctly, this valve restores shift timing and prevents driveline shock in wheel loaders, dozers, and other construction machinery operating in high-cycle environments.
Symptoms of Failure
When the ZF WG 310 begins to degrade, operators often notice delayed or harsh shifting between forward and reverse gears, a condition frequently searched as “transmission shift hesitation under load.” A second common failure mode is erratic clutch engagement, where the machine lurches or surges during directional changes, indicating the valve is failing to maintain consistent pilot pressure. Third, chronic low line pressure at idle, even after a fluid and filter change, points directly to internal wear of the WG 310 spool or bore. Finally, visible oil seepage around the valve body gasket or electrical connector port is a definitive sign that the WG 310 housing seal has compromised, leading to aeration and overheating of the transmission fluid.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | WG 310 |
| Valve Type | Hydraulic Modulating / Pressure Reducing |
| Body Material | High-Tensile Aluminum Alloy (A356-T6) |
| Spool Material | Case-Hardened Steel (HRC 58-62) |
| Operating Pressure Range | 150 – 320 psi (10.3 – 22.1 bar) |
| Flow Capacity | 18 GPM (68 L/min) at 200 psi |
| Weight | 2.4 lbs (1.09 kg) |
| Seal Type | Nitrile O-Ring / PTFE Backup Ring |
| OEM Reference | ZF 1327.301.310 |
Compatibility
This WG 310 valve is designed for integration into the following ZF transmission families, primarily used in construction and material handling equipment:
- ZF WG 180 – 4-speed powershift, common in compact wheel loaders.
- ZF WG 200 – 4-speed with torque converter lock-up, used in backhoe loaders.
- ZF WG 310 – Direct fit for the 5-speed heavy-duty variant (same SKU designation).
- ZF WG 150 – 3-speed unit, often found in telehandlers and skid steers.
- ZF Ergopower – Select models using the modular valve body architecture (verify serial number).
Note: Always cross-reference your transmission serial number with the WG 310 casting code to confirm compatibility, as internal porting varies between production years.
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
