Overview
This genuine ZF 4644.035.202 5 WG 201 Powershift Transmission Assembly is a complete, drop-in ready unit engineered for heavy-duty off-highway machinery. As the core drivetrain component in the WG 201 series, this assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, sealed housing. The SKU 4644.035.202 specifically designates a 5-speed forward, 1-speed reverse configuration with a standard SAE 3 bellhousing pattern. It is designed to handle high torque loads in wheel loaders, dozers, and material handlers, providing smooth power shifts under full load without interrupting power flow to the wheels.
Symptoms of Failure
When the ZF 4644.035.202 assembly begins to degrade, operators will notice distinct performance issues. Recognizing these signs early can prevent catastrophic drivetrain damage.
- Delayed or harsh engagement when shifting from neutral to forward: This indicates internal clutch pack wear or hydraulic pressure loss within the valve body, often accompanied by a loud “clunk” upon engagement.
- Transmission overheating during light load operation: A failing torque converter stator or worn thrust washers cause excessive heat generation, leading to discolored oil and a burnt smell from the breather.
- Intermittent gear slipping under load on inclines: The transmission may momentarily lose drive power in 3rd or 4th gear, with engine RPMs rising sharply before re-engaging, pointing to worn friction discs or a failing modulating piston.
- External oil leaks from the PTO cover or output shaft seal: Cracks in the main housing or degraded seal surfaces allow hydraulic fluid to escape, leading to low oil levels and eventual pump cavitation.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.035.202 |
| Series | WG 201 (5 WG 201) |
| Gear Configuration | 5 Forward / 1 Reverse (Powershift) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 620 mm |
| Bellhousing Pattern | SAE 3 |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| Main Housing Material | High-Grade Cast Iron (GGG-40) |
| Oil Capacity | 18.5 Liters (4.9 Gallons) |
Compatibility
This complete unit is specifically engineered for the ZF WG 201 series, but it also serves as a direct replacement for several other ZF powershift models due to shared mounting points and gear ratios. Verify your existing transmission model tag before ordering.
- ZF WG 180 Series: Compatible with later production models (after 2005) using the same SAE 3 bellhousing and 5-speed layout.
- ZF WG 200 Series: Direct fit for all WG 200 variants, including the 4 WG 200 and 5 WG 200, provided the output flange matches.
- ZF WG 210 Series: Mechanically interchangeable with the WG 210 when using an adapter plate for the torque converter pilot bore.
- ZF 4WG-200 / 5WG-200: Cross-compatible with these earlier designations, though hydraulic line routing may require minor adjustment.
