Overview
The ZF 4644.036.003 6 WG 201 Powershift Transmission Assembly represents a complete, fully-assembled unit engineered for demanding off-highway applications. This assembly integrates the hydraulic control system, clutch packs, and planetary gear sets into a single, ready-to-install package. As a core component of the WG 201 Series, it serves as the primary power transfer module, converting engine torque into controlled, multi-speed output for wheel loaders, telehandlers, and industrial tractors. The SKU 4644.036.003 is a direct replacement for original equipment units, ensuring seamless integration without the need for core rebuilding or sub-component sourcing.
Symptoms of Failure
When the ZF 4644.036.003 assembly begins to degrade, operators will notice distinct performance issues. Recognizing these signs early can prevent costly secondary damage.
- Erratic shifting or gear hunting: The transmission may fail to hold a selected gear under load, or it may randomly shift between ranges, indicating worn clutch discs or degraded hydraulic valve response within the assembly.
- Oil leaks from the bell housing or output flange: Seals and gaskets within the complete unit can harden or crack over time, leading to visible fluid loss. This is a common symptom of thermal fatigue in the WG 201 series.
- Delayed engagement or transmission slipping: A noticeable lag when shifting from neutral to forward or reverse suggests internal pressure loss or worn friction material in the clutch packs. This often manifests as a “soft” engagement before full torque transfer occurs.
- Unusual noise during operation: Grinding, whining, or clunking sounds, particularly during direction changes, point to bearing wear or planetary gear damage inside the 4644.036.003 unit.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.036.003 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 201 |
| Number of Speeds | 6 Forward / 3 Reverse |
| Approximate Dry Weight | 185 kg (408 lbs) |
| Housing Material | High-Strength Cast Iron |
| Input Torque Capacity | 650 Nm (479 lb-ft) |
| OEM Reference | ZF 4644.036.003 |
| Fluid Type | ZF TE-ML 03 or 05 |
Compatibility
This complete assembly is specifically engineered for the ZF WG 201 transmission series. While the WG 201 is the primary application, the 4644.036.003 unit shares core architecture with several related ZF models. It is a direct fit for the following transmissions:
- ZF WG 180 (late production variants with 6-speed configuration)
- ZF WG 200 (all standard torque versions)
- ZF WG 201 (primary application, all sub-variants)
- ZF WG 211 (limited compatibility, verify bell housing pattern)
This assembly is commonly used in JCB, Manitou, and Claas machinery that originally specified the WG 201 series. Always verify the input flange and PTO configuration against your existing unit before installation.
