Overview
The ZF 4644.103.033 OUTPUT for WG180 is a critical driveline component engineered to transfer rotational force from the transmission’s planetary gearset to the output flange or driveshaft. Positioned at the rear of the WG 180 series housing, this OEM genuine part ensures precise torque delivery and maintains proper alignment within the powertrain. The SKU 4644.103.033 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and long service life in heavy-duty applications. This output assembly works in concert with the TRANSMISSION HOUSING (4644101080) to seal the rear section and support the output shaft under high load conditions.
Symptoms of Failure
When the ZF 4644.103.033 OUTPUT begins to wear, operators often notice specific performance issues. Look for these common failure indicators:
- Oil leakage at the rear seal area – Worn output bearings or a damaged shaft surface can cause transmission fluid to weep past the seal, leaving puddles under the vehicle.
- Driveline vibration during acceleration – Excessive play in the output splines or bearing race creates a noticeable shudder that intensifies with speed.
- Intermittent gear slipping or delayed engagement – A failing output assembly can disrupt the hydraulic pressure feedback loop, leading to erratic shifting behavior.
- Metallic grinding noise from the transmission tail – Debris from a deteriorating output bearing often produces a distinct whine or grind when the transmission is in gear.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.103.033 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 245 mm |
| Shaft Diameter (bearing journal) | 55 mm |
| Spline Count | 21 involute splines |
| Weight | 4.2 kg |
| OEM Reference | ZF 4644.103.033 |
| Surface Finish | Black oxide coating |
Compatibility
This genuine ZF output component is primarily designed for the WG 180 series transmissions found in medium-duty trucks, buses, and off-highway equipment. It also fits select WG 200 variants where the output shaft interface and bearing journal dimensions match. For proper installation, ensure the mating HOUSING (4644301333) is free of cracks and that the TYPE PLATE (0730365125) is referenced for exact model identification. The output assembly is secured using a GROOVED STUD (0631311009) to lock the retaining nut in place. Always verify your transmission’s serial number against the WG 180 parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Encloses the gearset and supports the output assembly |
| 4644301333 | HOUSING | Rear adapter housing for output shaft alignment |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Locking stud for output nut retention |
| 0636305019 | SCREW PLUG | Seals oil passages in the output area |
| 4644301247 | THREADED BUSH | Provides wear-resistant thread for sensor mounting |
| 0634303485 | O-RING | Hydraulic seal between output housing and main case |
| 4644106055 | SHIFT SYSTEM | Controls gear engagement via hydraulic valves |
| 4642306050 | COVER PLATE | Protects shift mechanism from debris |
| 4644306464 | GASKET | Prevents fluid leaks at housing mating surfaces |
