Overview
The ZF 4644.026.262 WENDEGETRIEBE Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty industrial drivelines. As a core component of the WG 200 Series, this assembly integrates the forward-reverse shuttle clutch, hydraulic valve body, and planetary gear set into a single, ready-to-install package. The SKU 4644.026.262 specifically refers to the complete assembly, eliminating the need for piecemeal repairs. It sits directly between the torque converter and the main output shaft, managing directional changes under load without requiring the operator to stop the vehicle. This unit is engineered to handle high torque spikes in construction, mining, and agricultural machinery, ensuring seamless power flow during shuttle operations.
Symptoms of Failure
When the ZF 4644.026.262 begins to degrade, operators will notice distinct performance issues. Recognizing these signs early can prevent catastrophic driveline damage.
- Harsh or delayed engagement when shifting from forward to reverse: A worn shuttle clutch pack or degraded valve body seals causes a noticeable “clunk” or a 2-3 second delay before the transmission engages. This is often described as “ZF powershift shuttle clutch slipping under load.”
- Internal hydraulic pressure loss and fluid overheating: Worn piston seals within the WENDEGETRIEBE assembly allow pressurized oil to bypass, leading to high operating temperatures. You may see a “transmission temperature warning light flashing” on the dash, even with proper fluid levels.
- Oil leaks from the bell housing or shift cylinder area: Cracks in the housing or degraded O-rings on the shift cylinder produce visible drips. This is a common “ZF WG200 series oil leak near the torque converter” issue, often mistaken for a front seal failure.
- Intermittent loss of drive in one direction: The unit may drive forward normally but fail to reverse, or vice versa. This points to a specific clutch pack failure within the assembly, not a general transmission problem.
Technical Specifications
| Parameter | Specification |
|---|---|
| Assembly Type | WENDEGETRIEBE (Shuttle/Reversing Unit) – Complete Assembly |
| OEM Reference / Part Number | ZF 4644.026.262 |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Wet Weight (Approx.) | 68 kg (150 lbs) |
| Overall Length | 420 mm (16.5 in) |
| Mounting Bolt Pattern | SAE 3 (6-bolt, 203.2 mm diameter) |
| Max Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| Hydraulic Pressure Range | 18-22 bar (261-319 psi) |
Compatibility
This ZF 4644.026.262 assembly is engineered for the WG 200 Series of powershift transmissions. It is a direct replacement for units originally installed in the following models:
- ZF WG 180 (early production variants with SAE 3 mounting)
- ZF WG 200 (standard production, all sub-variants)
- ZF WG 210 (high-torque variants using the same shuttle housing)
This assembly is commonly found in Case IH and New Holland telehandlers, JCB loadalls, and Liebherr wheel loaders. It is also a critical fit for Manitou and Dieci telescopic handlers that utilize the ZF WG200 drivetrain. Always verify the SAE bell housing pattern and input shaft spline count before installation.
