Overview
The ZF 4143.303.084 COVER is a precision-engineered sealing component designed for the HL 100 and HL 270 series transmissions. This OEM genuine part serves as the primary closure for the transmission housing, protecting internal gear sets and hydraulic circuits from contaminants while maintaining proper oil pressure. Positioned on the side or end of the main casing, the cover integrates with the 4143101031: HOUSING to create a sealed environment essential for torque converter and planetary gear operation. The SKU 4143.303.084 is machined to exact OEM tolerances, ensuring a leak-free interface with mating components.
Symptoms of Failure
- Oil seepage around the cover perimeter: When the gasket surface degrades, transmission fluid escapes, leaving visible drips under the vehicle. This often triggers low fluid warnings and requires immediate replacement of the 4143.303.084 cover.
- Gear engagement hesitation or slipping: A warped or cracked cover allows air ingress, causing hydraulic pressure drops. Operators report delayed shifting or clutch slip during load changes, particularly in HL 270 applications.
- Contaminated transmission fluid: Cracks in the cover permit dirt and moisture entry, leading to dark, gritty oil. This accelerates wear on internal components like the 4143301055: HOUSING and valve bodies.
- Abnormal whining or grinding noises: A loose cover alters bearing preload, generating metallic sounds from the gear train. This symptom often accompanies failure of the 4143298040: CASE alignment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4143.303.084 |
| Material | Die-cast aluminum alloy (A380) |
| Weight | 1.45 kg (3.2 lbs) |
| Overall Dimensions | 210 mm x 145 mm x 35 mm |
| Bolt Hole Pattern | 6x M10 on 170 mm PCD |
| Surface Finish | Anodized, Ra 0.8 µm sealing face |
| OEM Reference | ZF 4143.303.084 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This cover is engineered for ZF HL 100 and HL 270 series transmissions, commonly found in heavy-duty off-highway vehicles, agricultural tractors, and construction equipment. It is also compatible with WG180, WG200, and WG250 models when used with the appropriate 0631329135: SPRING PIN for alignment. The 4143.303.084 fits both 4-speed and 6-speed variants, though always verify bolt pattern compatibility with your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101031 | HOUSING | Main structural casing for gear sets |
| 4143301055 | HOUSING | Secondary housing for valve body assembly |
| 4143298040 | CASE | Outer shell for torque converter section |
| 0631329135 | SPRING PIN | Alignment dowel for cover positioning |
| 0636101024 | CAP SCREW | M10 fastener for cover retention |
| 4475280099 | SCREW PLUG | Seals oil fill/drain ports |
| 0634303266 | O-RING | Gasket seal between cover and housing |
| 4143301045 | SCREEN SHEET | Mesh filter for oil return circuit |
| 0636420051 | COUNTERSUNK SCREW | Flush-mount fastener for screen sheet |
| 0501200072 | VENT VALVE | Pressure relief for transmission breathing |
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