Overview
The ZF 4143.115.003 PLANETARY DRIVE is a critical torque-multiplying assembly within the HL 100 and HL 270 series transmissions. This OEM genuine part sits directly in the power flow path, transferring rotational force from the torque converter to the output shaft through a set of sun, planet, and ring gears. As a high-precision component, the SKU 4143.115.003 ensures exact gear mesh alignment and load distribution. It is typically housed within the main transmission casing, working in conjunction with the 4143101009: HOUSING and the 4143301025: HOUSING to maintain structural integrity under heavy loads.
Symptoms of Failure
- Intermittent gear slipping under load: When the planetary drive wears, you may notice the transmission momentarily loses power during acceleration, especially on inclines.
- Metallic grinding or whining noise: A high-pitched whine from the transmission center section often indicates pitting or spalling on the planetary gear teeth.
- Contaminated transmission fluid with metal debris: Small silver or bronze particles in the oil pan signal that the planetary carrier bearings or gear surfaces are degrading.
- Erratic shifting or delayed engagement: Worn planetary components can cause the transmission to hesitate before engaging a gear, often accompanied by a harsh clunk.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4143.115.003 |
| OEM Reference | ZF 4143 115 003 |
| Material | Case-hardened alloy steel (gears); aluminum carrier |
| Weight (approx.) | 4.2 kg (9.3 lbs) |
| Outer Diameter | 145 mm |
| Overall Length | 112 mm |
| Number of Planet Gears | 3 |
| Max Input Torque | 1,200 Nm |
Compatibility
This planetary drive is engineered for ZF transmissions in the HL series, specifically the HL 100 and HL 270 series. It is also a direct fit for the WG180 and WG200 models, which share the same planetary carrier architecture. For proper sealing during installation, always replace the 0634313603: O-RING and the 4475280018: SCREW PLUG to prevent fluid loss. Additional compatible models include the WG210 and WG250 series, though we recommend verifying the housing bore diameter against your existing unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the planetary drive and supports shaft alignment |
| 4143301025 | HOUSING | Secondary housing for clutch pack and valve body interface |
| 0634313603 | O-RING | Seals the planetary carrier to the housing bore |
| 4475280018 | SCREW PLUG | Closes oil passages in the housing |
| 0501342341 | SUPPORT RING | Provides axial support for the planetary gear set |
| 4143298457 | SEAL KIT | Contains all gaskets and O-rings for overhaul |
| 0634313591 | O-RING | Seals the oil pump cover to the housing |
| 0636101068 | CAP SCREW | Fastens the planetary carrier to the output shaft |
| 4143221013 | THROTTLE VALVE | Controls hydraulic pressure for shift timing |
| 0634304484 | O-RING | Seals the throttle valve bore |
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