Overview
The ZF 4143.315.088 PLANETARY GEAR is a critical torque-multiplying component engineered specifically for the HL 100 and HL 270 series transmissions. This OEM genuine part sits within the planetary gearset assembly, where it distributes rotational force evenly across multiple pinions to achieve the necessary gear reduction for heavy-duty industrial applications. As a high-precision element, the 4143.315.088 ensures smooth power flow between the input shaft and the output carrier, directly influencing the transmission’s overall efficiency and load-handling capability. This gear is designed to withstand extreme axial and radial loads, making it indispensable for machinery operating in demanding environments.
When installing this planetary gear, it is essential to pair it with the correct 4143101022 HOUSING to maintain proper alignment and oil circulation. The assembly also relies on the 4143301044 HOUSING to enclose the gearset and protect it from contaminants. For secure fastening during installation, the 0631329135 SPRING PIN is used to lock components in place, while the 0636302014 SCREW PLUG seals the hydraulic passages within the system.
Symptoms of Failure
- Whining or grinding noise from the transmission housing: A worn planetary gear often produces a high-pitched whine or metallic grinding sound during operation, especially under load or when shifting between forward and reverse.
- Intermittent gear slipping or loss of torque: As the gear teeth wear unevenly, the transmission may fail to maintain consistent power delivery, causing the vehicle or equipment to hesitate or lose traction on inclines.
- Metallic debris in the transmission oil filter: Flakes or particles found during routine oil changes indicate that the planetary gear’s hardened surfaces are degrading, which can clog the 0634801057 SEALING RING and other internal seals.
- Overheating of the transmission case: Excessive friction from a failing gear generates abnormal heat, often accompanied by a burnt oil smell and reduced hydraulic pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4143.315.088 |
| Gear Type | Planetary (Sun/Planet Carrier Assembly) |
| Outer Diameter | ~185 mm |
| Inner Bore Diameter | ~45 mm |
| Overall Width | ~62 mm |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Surface Hardness | 58-62 HRC |
| Weight | ~3.4 kg |
| OEM Reference | ZF 4143.315.088 |
| Tooth Count (Sun) | 18 |
| Tooth Count (Planet) | 24 |
Compatibility
This planetary gear is designed for use in ZF HL 100 and HL 270 series transmissions, which are commonly found in heavy-duty construction vehicles, agricultural tractors, and material handling equipment. It is also compatible with the following ZF models that share the same planetary carrier architecture: WG180, WG200, WG210, and WG250. The part is a direct replacement for OEM units in these transmissions, ensuring proper gear mesh and load distribution without modification. Always verify the serial number of your transmission before ordering to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101022 | HOUSING | Encloses the planetary gearset and supports bearing surfaces |
| 4143301044 | HOUSING | Secondary housing for oil distribution and gear alignment |
| 0631329135 | SPRING PIN | Locks planetary carrier pins to prevent rotation |
| 0636302014 | SCREW PLUG | Seals hydraulic ports in the transmission case |
| 0634801057 | SEALING RING | Prevents oil leakage between gear interfaces |
| 4143301053 | CONNECTING PART | Links the planetary carrier to the output shaft |
| 0636100600 | CAP SCREW | Secures the housing assembly to the transmission body |
| 0636101024 | CAP SCREW | High-tensile fastener for planetary carrier retention |
| 0730365159 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment stud for precise housing positioning |
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