Overview
This OEM genuine ZF 4461.320.364 is a critical hydraulic control valve assembly engineered for the precise modulation of clutch packs within heavy-duty ZF transmissions. Designed to manage fluid pressure and flow, this component ensures seamless gear engagement and disengagement under extreme load conditions common in construction machinery. The 4461.320.364 part number identifies a factory-spec replacement unit that restores original shift quality and prevents internal transmission damage. It sits directly on the valve body housing, directing oil to the appropriate clutches based on electronic or hydraulic commands from the transmission control unit.
Symptoms of Failure
When this valve assembly degrades, operators will notice distinct operational anomalies. Watch for these specific failure indicators:
- Delayed or harsh gear engagement: A noticeable lag when shifting from neutral to drive or reverse, often accompanied by a jarring clunk, indicates the valve is not building pressure correctly.
- Erratic shift patterns: The transmission may skip gears, hold a gear too long, or hunt between ratios under steady throttle, pointing to internal spool wear or contamination.
- Internal hydraulic leaks: Visible oil seepage around the valve body gasket or a gradual drop in transmission fluid level without external drips suggests the valve bores are worn, bypassing pressure.
- Torque converter lock-up failure: If the converter fails to lock or unlocks prematurely at highway speeds, the valve’s inability to maintain steady pilot pressure is a likely cause.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4461.320.364 |
| OEM Reference | ZF 4461 320 364 |
| Material | High-tensile aluminum alloy with hardened steel spools |
| Weight | 3.2 kg (7.05 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 95 mm |
| Operating Pressure | 12-18 bar (174-261 psi) |
| Seal Type | Viton O-rings with PTFE backup rings |
Compatibility
This genuine ZF valve assembly is designed for integration into specific heavy-duty transmission platforms used in wheel loaders, graders, and dump trucks. It is a direct fit for the following ZF models:
- ZF WG180 – 6-speed powershift transmission
- ZF WG200 – 6-speed powershift transmission (late production)
- ZF 4WG200 – 4-speed version with integrated torque converter
- ZF 6WG250 – Heavy-duty off-highway variant
Always verify your transmission serial number and valve body casting code before installation. Cross-reference with your equipment manufacturer’s parts catalog to ensure correct application.
