Overview
This OEM Genuine ZF 4168.028.064 component is a critical hydraulic control valve assembly designed for integration within heavy-duty ZF powershift transmissions. It precisely regulates oil flow and pressure to engage clutch packs, enabling smooth gear changes under high torque loads in construction machinery. The SKU 4168.028.064 sits directly on the transmission valve body, acting as the central command unit for shift sequencing. As a genuine ZF part, it ensures exact OEM tolerances, preventing premature wear on internal planetary gears and friction discs. This part is essential for maintaining the operational integrity of wheel loaders, graders, and dozers that rely on ZF drivetrains.
Symptoms of Failure
When the ZF 4168.028.064 begins to degrade, operators will notice distinct performance issues. Recognizing these early warning signs can prevent catastrophic transmission damage.
- Erratic or delayed gear engagement: A worn valve spool or damaged seals cause hesitation when shifting from neutral to forward or reverse, often accompanied by a harsh “clunk.” This is a common search query for “ZF transmission slow to engage.”
- Internal oil pressure loss and overheating: Leaking within the valve body reduces clutch pack clamping force, leading to slippage under load. This generates excessive heat, detectable by a rising transmission temperature gauge. This aligns with “transmission overheating under load” searches.
- Contaminated hydraulic fluid: Metal shavings or debris in the oil filter or sump magnet indicate internal wear of the valve spool or bore. This symptom often appears alongside “transmission valve body debris” queries.
- Intermittent loss of a specific gear: A stuck or sticking valve can cause a single gear range (e.g., 2nd gear) to fail entirely while others function normally, a classic sign of “ZF transmission missing a gear.”
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | ZF 4168.028.064 |
| Component Type | Hydraulic Control Valve Assembly |
| Material | High-Tensile Aluminum Alloy / Hardened Steel Spools |
| Weight (approx.) | 4.2 kg (9.3 lbs) |
| Dimensions (L x W x H) | 280 mm x 180 mm x 95 mm |
| Operating Pressure Range | 12 – 25 bar (174 – 362 psi) |
| OEM Reference | Genuine ZF Friedrichshafen AG |
Compatibility
This genuine ZF 4168.028.064 valve assembly is engineered for specific ZF powershift transmission families used in heavy construction equipment. It is primarily compatible with the following models:
- ZF WG180 (Wheel Loader series)
- ZF WG200 (Wheel Loader and Dozer series)
- ZF WG210 (Motor Grader applications)
- ZF 4WG-200 (4-speed variant)
- ZF 6WG-200 (6-speed variant)
Cross-reference your transmission serial plate to confirm fitment. This part is not interchangeable with earlier WG119 or WG150 series valve bodies without adapter kits.
