Overview
This OEM Genuine ZF 5501.317.949 is a critical hydraulic control valve assembly engineered for heavy-duty construction machinery transmissions. Positioned within the valve body of ZF power shift transmissions, this component precisely directs oil flow to modulate clutch engagement and gear selection. The SKU 5501.317.949 ensures exact OEM tolerances for consistent shift quality under extreme loads. Without this part, the transmission cannot regulate hydraulic pressure, leading to erratic or complete loss of drive functionality. It is a direct replacement for worn or failed units in demanding off-highway applications.
Symptoms of Failure
When the ZF 5501.317.949 valve assembly deteriorates, operators will notice distinct operational issues. Recognizing these signs early prevents catastrophic transmission damage.
- Erratic gear engagement or delayed shifting: The machine hesitates or slams into gear due to inconsistent hydraulic pressure regulation from a worn spool or bore.
- Internal hydraulic oil leaks: Visible oil seepage around the transmission valve body or a drop in fluid level without external drips indicates seal failure within the 5501.317.949 assembly.
- Transmission overheating under load: A stuck valve causes constant clutch slippage, generating excessive heat that triggers warning lights or reduces performance.
- Loss of forward or reverse drive: Complete failure of this valve blocks oil flow to specific clutch packs, making the machine unable to move in one or all directions.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 5501.317.949 |
| OEM Reference | ZF 5501.317.949 (Genuine) |
| Material | High-tensile aluminum alloy with hardened steel spools |
| Weight | 1.8 kg (4.0 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 65 mm |
| Operating Pressure | 12–18 bar (174–261 psi) |
| Seal Type | Nitrile rubber O-rings (included) |
Compatibility
This genuine ZF valve assembly is designed for integration into specific power shift transmission families used in construction machinery. It is a direct fit for the following models:
- ZF WG180 series (all variants)
- ZF WG200 series (including WG200-3 and WG200-5)
- ZF WG120 series (early production runs)
- ZF 4WG-200 and 4WG-180 configurations
Always verify your transmission serial number against the OEM parts catalog before installation. This part is not backward compatible with WG100 or WG150 series without adapter kits.
