Overview
The ZF 4646.103.450 OUTPUT sub-assembly is a precision-engineered component designed for the WG 250, WG 260, and WG 310 series transmissions. This OEM-grade part serves as the primary power take-off (PTO) interface, transferring rotational force from the transmission to auxiliary hydraulic systems. Positioned on the rear housing of the gearbox, this output unit ensures seamless engagement for dump trucks, concrete mixers, and refuse vehicles. The SKU 4646.103.450 is manufactured to exacting tolerances, featuring hardened steel splines that withstand high torque loads. When installing this sub-assembly, technicians must secure it using the 0636115293: 螺栓 and 0736300232: 螺栓 to maintain proper clamping force. Additionally, the 4475280208: SCREW PLUG seals the hydraulic port, while the 0634316523: O-RING prevents fluid migration between mating surfaces.
Symptoms of Failure
- Hydraulic oil seepage from output shaft seal – Worn bearings or housing cracks in the 4646.103.450 allow transmission fluid to escape, leaving puddles under the vehicle after extended operation.
- Intermittent PTO engagement failure – When the output sub-assembly loses spline integrity, the PTO may fail to engage or disengage, causing erratic hydraulic pump operation during load cycles.
- Vibration and whining noise at idle – Deteriorated internal bushings within the WG 250/WG 260 output unit produce audible metal-on-metal sounds, particularly noticeable when the transmission is in neutral.
- Reduced hydraulic pressure under load – A failing output assembly can cause a 15-20% drop in system pressure, leading to sluggish lifting or steering response in heavy equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.103.450 |
| Overall Length | 185 mm |
| Flange Diameter | 120 mm |
| Spline Count | 14-tooth, 30° pressure angle |
| Material | Case-hardened 20MnCr5 steel |
| Weight | 2.8 kg |
| OEM Reference | ZF 4646.103.450 |
| Seal Type | Viton double-lip with dust exclusion |
| Max Operating Pressure | 25 bar (362 psi) |
Compatibility
This output sub-assembly is engineered for ZF’s WG series powershift transmissions. It directly fits the WG 250, WG 260, and WG 310 models, which are commonly used in mid-range construction and agricultural machinery. The 4646.103.450 is also compatible with the WG 180 and WG 200 series when used with an adapter kit, though OEM verification is recommended. For WG 261 and WG 311 variants, this part serves as a direct replacement for the original output unit. Always cross-reference your transmission serial number with the ZF parts catalog to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures output housing to transmission case |
| 0736300232 | 螺栓 | Mounting bolt for PTO flange |
| 4475280208 | SCREW PLUG | Seals hydraulic test port |
| 0634316523 | O-RING | Prevents oil leakage at output shaft |
| 0630361026 | SEALING CAP | Protects unused PTO openings |
| 0501214611 | 齿轮泵 | Hydraulic pump for auxiliary systems |
| 0634313945 | O形圈 | Seals pump-to-output interface |
| 0501322534 | TEMPERATURE SENSOR | Monitors hydraulic fluid temperature |
| 0634313366 | O-RING | Seals sensor mounting bore |
| 4646130044 | ENGINE CONNECTION | Links transmission to engine flywheel |
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