Overview
The ZF 4651.103.007 OUTPUT for WG100 is a critical driveline component engineered to transfer torque from the transmission’s planetary gearset to the output flange or driveshaft. Positioned at the rear of the WG 100 series gearbox, this OEM genuine part ensures precise rotational alignment and load distribution under high-stress industrial conditions. The SKU 4651.103.007 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification. When paired with a robust TRANSMISSION HOUSING, this output shaft maintains the structural integrity of the entire assembly, preventing axial play that can lead to premature wear on adjacent components.
Symptoms of Failure
- Oil seepage at the rear seal interface: A worn 4651.103.007 output often damages the sealing surface, causing transmission fluid to leak past the O-RING and drip from the bell housing area.
- Driveline vibration under load: When the output splines or bearing journal wear, operators may notice a rhythmic shudder during acceleration, particularly in WG100-equipped forklifts or material handlers.
- Intermittent gear engagement noise: A failing output shaft allows the planetary carrier to shift out of alignment, producing a metallic clatter when shifting between forward and reverse.
- Reduced power transfer efficiency: Excessive clearance in the output hub causes torque loss, leading to sluggish performance and increased fuel consumption in heavy-duty applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.103.007 |
| Overall Length | 245 mm (estimated) |
| Shaft Diameter (bearing journal) | 45 mm |
| Spline Count | 24-tooth involute |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 3.2 kg (7.0 lbs) |
| OEM Reference | ZF 4651.103.007 |
| Surface Treatment | Black oxide corrosion protection |
Compatibility
This genuine ZF output is specifically designed for the WG 100 series transmission family. It is a direct replacement for models including the WG101, WG102, WG103, and WG104. The 4651.103.007 also fits select variants of the WG180 and WG200 series when used with the appropriate HOUSING adapter. For proper installation, always verify the output shaft’s spline engagement with the HOUSING assembly to ensure concentricity. This part is not backward-compatible with older ZF 4WG-65 or 4WG-80 models without significant modifications to the rear cover.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Encloses and supports the gear train and output shaft |
| 4651301025 | HOUSING | Rear adapter housing for output flange mounting |
| 0634303928 | O-RING | Seals the output shaft bore against fluid leakage |
| 4651301031 | HOUSING | Intermediate housing for extended output configurations |
| 4651203002 | SCREEN SHEET | Filters debris from transmission oil flow |
| 4651303005 | SCREEN SHEET | Secondary filtration screen for high-pressure circuits |
| 0636101032 | CAP SCREW | Fastens housing components to specified torque |
| 0630361028 | SEALING CAP | Protects unused ports from contamination |
| 4475280060 | SCREW PLUG | Seals threaded oil passages in the housing |
| 0634303312 | O-RING | Gasket for housing-to-output shaft interface |
