Overview
The ZF 4143.102.002 INPUT is a critical OEM genuine component engineered for the HL 100 Series and HL 270 Series transmission assemblies. This input shaft assembly serves as the primary torque transfer interface between the engine coupling and the planetary gear sets, ensuring precise rotational alignment and load distribution under high-stress industrial applications. The SKU 4143.102.002 is manufactured to ZF’s exacting tolerances, featuring case-hardened alloy steel construction to withstand continuous heavy-duty cycles. When replacing this input unit, technicians commonly inspect the adjacent 4143101009: HOUSING and 4143301025: HOUSING for wear, as these components share the same hydraulic circuit and bearing support structure.
Symptoms of Failure
- Oil leaks at the input seal area: A worn 4143.102.002 shaft surface or damaged 0634313603: O-RING allows transmission fluid to weep past the seal, leaving visible drips under the bell housing.
- Gear slipping under load: Excessive axial play in the input shaft causes intermittent engagement loss, particularly during torque converter lockup in HL 270 models.
- Abnormal whining or grinding noise: Bearing race damage on the input shaft produces a metallic whine that increases with engine RPM, often misdiagnosed as a torque converter issue.
- Hard shifting or delayed engagement: Worn splines on the 4143.102.002 prevent smooth clutch pack actuation, leading to harsh 1-2 shifts in WG180 and WG200 transmissions.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4143.102.002 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (12.28 in) |
| Shaft Diameter (bearing journal) | 45 mm (1.77 in) |
| Spline Count (input) | 24-tooth involute spline |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4143.102.002 |
| Torque Capacity | 1,200 Nm (885 ft-lbs) |
Compatibility
This genuine ZF input shaft is designed for the HL 100 and HL 270 series transmissions, but its spline geometry and bearing dimensions also make it compatible with the WG180, WG200, and WG210 models used in construction and agricultural equipment. For proper sealing, always replace the 4475280018: SCREW PLUG during installation to prevent pressure loss. The 4143.102.002 is not backward-compatible with pre-2005 ZF 4HP series units due to differing shaft diameters.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the input shaft and valve body assembly |
| 4143301025 | HOUSING | Rear housing supporting output shaft bearings |
| 0634313603 | O-RING | Seals the input shaft bore against fluid leakage |
| 4475280018 | SCREW PLUG | Closes hydraulic test ports on the housing |
| 0501342341 | SUPPORT RING | Provides axial support for the input shaft bearing |
| 4143298457 | SEAL KIT | Contains all O-rings and gaskets for input shaft service |
| 0634313591 | O-RING | Seals the pump-to-housing interface |
| 0636101068 | CAP SCREW | Fastens the input shaft retaining plate |
| 4143221013 | THROTTLE VALVE | Regulates hydraulic pressure based on engine load |
| 0634304484 | O-RING | Seals the throttle valve bore in the valve body |
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