Overview
The ZF 4644.124.400 POWER TAKE-OFF (PTO) is a critical auxiliary power interface engineered specifically for the WG 200 Series transmission family. This OEM genuine part, identified by SKU 4644.124.400, mounts directly to the transmission housing to divert engine torque to hydraulic pumps, compressors, or other driven equipment. It sits on the rear or side face of the gearbox, engaging with the main shaft gearing to provide a reliable power source without interrupting vehicle driveline operation. Precision-machined from high-strength alloy, this unit ensures minimal parasitic loss and maximum durability under continuous heavy-load cycles.
Symptoms of Failure
- Hydraulic pump hesitation or intermittent power loss: When the PTO gear teeth wear or the shift fork becomes misaligned, the unit may fail to maintain positive engagement, causing erratic pump output under load.
- Oil seepage around the PTO mounting flange: Deteriorated gaskets or a cracked housing seal lead to transmission fluid weeping, often visible as drips beneath the chassis near the PTO location.
- Grinding or whining noise during engagement: Worn bearings or damaged gear teeth produce distinct metallic sounds when the PTO is activated, indicating imminent internal failure.
- Inability to disengage the PTO: A stuck shift mechanism or corroded internal components can lock the PTO in the engaged position, draining engine power and risking transmission damage.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.124.400 |
| OEM Reference | ZF 4644.124.400 |
| Material | Case-hardened alloy steel (gear); die-cast aluminum (housing) |
| Weight | Approx. 8.2 kg (18.1 lbs) |
| Mounting Type | Flange-mounted, 6-bolt pattern |
| Max Torque Capacity | 400 Nm (295 lb-ft) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This PTO is designed for the ZF WG 200 Series, including models WG180, WG200, and WG210. It also fits select variants of the ZF Ecomat 4HP and 5HP series when used with the appropriate 4644101216: TRANSMISSION HOUSING or 4644301223: TRANSMISSION HOUSING. Always verify the housing interface and shift mechanism compatibility before installation. The unit requires a 0730365067: TYPE PLATE for correct identification and a 0631311009: GROOVED STUD for secure mounting alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main gearbox casing that supports the PTO mounting flange |
| 4644301223 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series compatibility |
| 0730365067 | TYPE PLATE | Identification tag for transmission and PTO specifications |
| 0631311009 | GROOVED STUD | Alignment and retention stud for PTO mounting |
| 4644303060 | COVER PLATE | Seals the PTO opening when unit is not installed |
| 4644303061 | COVER PLATE | Alternate cover plate for different housing configurations |
| 0634306525 | O-RING | Hydraulic seal between PTO flange and housing |
| 0636305026 | SCREW PLUG | Oil drain or fill plug for the PTO cavity |
| 4644301279 | SCREEN SHEET | Filter mesh protecting internal PTO oil passages |
| 4644301088 | SEALING CAP | Protective cap for unused PTO ports |
