Overview
The ZF 4143.103.402 OUTPUT is a critical OEM genuine component designed for the rear output section of ZF’s heavy-duty HL 100 and HL 270 series transmissions. This part serves as the primary interface between the transmission housing and the driveline, transferring rotational torque from the planetary gearset to the output flange. As a precision-machined steel component, it ensures concentric alignment and load distribution under high-stress conditions. The SKU 4143.103.402 is factory-tested to meet ZF’s strict tolerances for spline engagement and surface hardness. It sits directly within the rear housing assembly, sealed by the 0634313603 O-RING and secured by the 4475280018 SCREW PLUG, making it a non-negotiable element for maintaining driveline integrity.
Symptoms of Failure
- Oil leakage at the rear seal area: A worn 4143.103.402 output shaft can develop scoring or pitting, allowing transmission fluid to weep past the seal. This often manifests as drips under the bell housing or along the driveshaft.
- Gear slipping or delayed engagement: When the output splines wear, torque transfer becomes inconsistent, causing the transmission to slip under load—especially noticeable during hill climbs or heavy towing.
- Vibration or driveline shudder: A bent or fatigued output shaft creates imbalance, transmitting vibration through the chassis at highway speeds. This symptom worsens as the 4143101009 HOUSING or 4143301025 HOUSING becomes misaligned.
- Metallic grinding noise: Advanced wear causes the output shaft to contact the housing bore, producing a distinct grinding sound during rotation. Immediate inspection of the 0634313603 O-RING and surrounding seals is advised.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4143.103.402 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 185 mm (7.28 in) |
| Shaft Diameter (bearing journal) | 45 mm (1.77 in) |
| Spline Count | 24 involute splines (DIN 5480) |
| Weight | 2.3 kg (5.07 lbs) |
| OEM Reference | ZF 4143.103.402 |
| Surface Hardness | 58-62 HRC |
| Torque Capacity | 1,200 Nm (885 lb-ft) max |
Compatibility
This OEM genuine output shaft is engineered for the ZF HL 100 and HL 270 series transmissions, which are commonly found in medium-duty trucks, construction loaders, and agricultural tractors. Based on its spline geometry and housing interface, the 4143.103.402 is also compatible with the following ZF models: WG180, WG200, WG210, and WG220. It directly replaces worn units in 6-speed and 8-speed powershift variants. For proper installation, always pair this output with a new 0634313591 O-RING and inspect the 4143298457 SEAL KIT for any additional sealing requirements.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the output shaft and supports bearing alignment |
| 4143301025 | HOUSING | Rear housing section that mates with the output flange |
| 0634313603 | O-RING | Seals the output shaft to prevent fluid leaks |
| 4475280018 | SCREW PLUG | Secures the output shaft retaining ring |
| 0501342341 | SUPPORT RING | Provides axial support for the output shaft bearing |
| 4143298457 | SEAL KIT | Complete set of seals for output section rebuild |
| 0634313591 | O-RING | Secondary seal for the output housing cover |
| 0636101068 | CAP SCREW | Fastens the output flange to the shaft |
| 4143221013 | THROTTLE VALVE | Controls hydraulic pressure to the output clutch pack |
| 0634304484 | O-RING | Seals the throttle valve bore in the valve body |
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