Overview
The ZF 6073.324.079 DRIVE PROGRAM is a critical OEM genuine component engineered for the internal hydraulic control circuit within heavy-duty ZF powershift transmissions. This part functions as a precision-machined valve spool or program plate, governing the sequential engagement of clutch packs during gear shifts. It ensures that hydraulic pressure is routed correctly to the appropriate clutches, enabling smooth, reliable power delivery under extreme load conditions. The SKU 6073.324.079 is specifically calibrated for construction machinery applications, where consistent shift quality directly impacts cycle times and operator safety. Without this component, the transmission cannot execute its programmed shift logic, leading to erratic behavior or complete driveline disengagement.
Symptoms of Failure
When the ZF 6073.324.079 DRIVE PROGRAM wears or becomes contaminated, operators will notice distinct performance degradation. Below are the most common failure indicators:
- Erratic or delayed gear engagement: The transmission hesitates before engaging a gear, or it engages with a harsh “clunk.” This is often caused by internal wear on the program spool, preventing proper hydraulic sequencing.
- Intermittent gear slippage under load: The transmission slips out of gear when the machine is pushing or lifting, resulting in a loss of tractive effort. This occurs when the drive program fails to maintain sufficient clutch pressure.
- Hydraulic oil contamination or metallic debris in the filter: Worn surfaces on the 6073.324.079 shed fine metallic particles into the transmission oil. Frequent filter changes or visible debris in the sump indicate this part is degrading.
- Transmission stuck in neutral or fails to shift: The machine may refuse to move in any gear, or it gets stuck in a single gear and cannot upshift or downshift, directly pointing to a failed drive program component.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 6073.324.079 |
| Component Type | Drive Program (Valve Spool / Shift Program Plate) |
| Material | Hardened Alloy Steel (Nitrided) |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 6073.324.079 (Genuine) |
| Operating Pressure Range | 12 – 25 bar (174 – 362 psi) |
| Surface Finish | Ground & Lapped (Ra ≤ 0.4 µm) |
Compatibility
This genuine ZF 6073.324.079 DRIVE PROGRAM is designed for use in the following ZF transmission families commonly found in construction machinery such as wheel loaders, dozers, and telehandlers:
- ZF WG180 Series – All variants including WG180, WG180/II, and WG180/III.
- ZF WG200 Series – Standard WG200 and high-torque WG200/II models.
- ZF WG150 Series – Select models with electronic shift control (verify housing code).
- ZF 4WG-180 / 4WG-200 – Four-speed powershift versions used in mid-size loaders.
Always confirm the transmission serial number and housing code before installation. The 6073.324.079 is not backward compatible with older mechanical-only shift programs without electronic modulation.
