Overview
The ZF 4143.301.055 HOUSING is a critical structural component engineered for the HL 100 and HL 270 series transmissions. This OEM genuine part serves as the primary enclosure that supports the gear train, shaft assemblies, and hydraulic valve body, ensuring precise alignment under high-torque loads. As the central casing, it protects internal components from contamination while maintaining oil circulation pathways. The SKU 4143.301.055 is manufactured to ZF’s exacting tolerances, making it essential for restoring factory-spec performance in heavy-duty industrial transmissions. When replacing this housing, technicians often inspect the 4143101025: HOUSING for complementary wear patterns in adjacent assemblies.
Symptoms of Failure
- Oil leaks at the transmission housing seam: Cracks or warpage in the 4143.301.055 housing allow hydraulic fluid to escape, leading to low oil levels and overheating. Search queries like “ZF transmission housing oil leak repair” often point to this failure.
- Gear slipping under load: A deformed housing misaligns the countershaft and main shaft, causing intermittent power loss. This symptom is frequently reported alongside “HL 270 gear engagement issues.”
- Excessive vibration or noise: When the housing loses structural integrity, bearing bores become ovalized, producing a distinct whine or clatter. Technicians searching for “ZF HL 100 noisy transmission housing” should inspect this part.
- Contaminated transmission fluid: A fractured housing allows debris ingress, accelerating wear on internal components like the 0501337904: SPEED SENSOR.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4143.301.055 |
| Material | High-strength aluminum alloy (A356-T6) |
| Weight | 12.4 kg (27.3 lbs) |
| Overall Dimensions (L x W x H) | 480 mm x 320 mm x 210 mm |
| Bolt Hole Pattern | 12x M12 x 1.75 on 380 mm PCD |
| OEM Reference | ZF 4143.301.055 |
| Sealing Surface Finish | Ra 0.8 µm |
Compatibility
This housing is designed for ZF’s HL 100 and HL 270 series transmissions, which are commonly found in wheel loaders, forklifts, and industrial vehicles. It also fits select WG180 and WG200 models when used with the appropriate 4143298040: CASE adapter. For proper assembly, ensure the 0631329135: SPRING PIN is correctly aligned during installation to prevent dowel shear. Additional compatible models include the WG150 and WG250 series, though cross-referencing the original transmission tag is recommended.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101025 | HOUSING | Secondary housing for auxiliary drive gears |
| 4143298040 | CASE | Main structural case for torque converter section |
| 0631329135 | SPRING PIN | Alignment dowel for housing-to-case interface |
| 0501337904 | SPEED SENSOR | Monitors output shaft RPM for shift control |
| 0636101024 | CAP SCREW | M12 fastener for housing bolt pattern |
| 4475280099 | SCREW PLUG | Seals oil drain port in housing |
| 0634303266 | O-RING | Gasket for housing-to-case sealing |
| 0501200072 | VENT VALVE | Pressure relief for housing cavity |
| 4475280015 | SCREW PLUG | Plug for inspection hole on housing |
| 0501217673 | LUBRICATING NIPPLE | Grease fitting for housing bearing points |
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