Overview
The ZF 4143.325.100 COVER is a precision-engineered OEM genuine component designed for the HL 100 and HL 270 series transmissions. This cover serves as a critical sealing and protective barrier, enclosing the internal gear train and hydraulic valve body from external contaminants while maintaining proper oil pressure within the housing assembly. Positioned on the main casing of the transmission, this part ensures structural integrity and prevents fluid migration between chambers. The SKU 4143.325.100 is a direct replacement for factory-installed covers, guaranteeing exact fitment and material compatibility with ZF’s original specifications.
Symptoms of Failure
- External oil seepage around the housing joint: When the cover gasket surface degrades or the metal warps, transmission fluid may leak from the mating surface, often noticed as drips under the vehicle after prolonged operation.
- Contaminated fluid and erratic shifting: A cracked or compromised cover allows dirt and moisture to enter the transmission, leading to sludge buildup that causes delayed engagement or harsh gear changes.
- Increased operating noise from the gear train: If the cover loses its structural rigidity, it can vibrate or allow misalignment of internal components, producing a whining or grinding sound during acceleration.
- Low fluid level warnings without visible external leaks: Internal cracks in the cover can cause fluid to bypass into adjacent cavities, reducing the effective oil volume and triggering pressure drop alerts.
Technical Specifications
| Part Number | 4143.325.100 |
| Material | Die-cast aluminum alloy (A380 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 320 mm x 210 mm x 45 mm |
| OEM Reference | ZF 4143.325.100 |
| Surface Treatment | Corrosion-resistant anodized coating |
| Bolt Hole Pattern | 12-point, M8 x 1.25 thread |
Compatibility
This cover is specifically engineered for the ZF HL 100 and HL 270 transmission series, which are commonly used in heavy-duty off-highway vehicles, wheel loaders, and industrial machinery. Based on the part type and mounting configuration, it is also compatible with the following ZF models: WG180, WG200, 4WG200, and 5WG210 series. Always verify the casting number on your existing cover before installation to ensure proper fitment.
When replacing this cover, it is highly recommended to install a new 4143298459 REPAIR KIT to refresh all gaskets and seals simultaneously. The cover mounts directly onto the 4143101022 HOUSING or the 4143301044 HOUSING, depending on your transmission variant. Secure the assembly using a 0631329135 SPRING PIN to lock the cover in position against vibration.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143298459 | REPAIR KIT | Includes gaskets and seals for cover reinstallation |
| 4143101022 | HOUSING | Main transmission casing that the cover seals |
| 4143301044 | HOUSING | Alternate housing variant for HL 270 series |
| 0631329135 | SPRING PIN | Alignment and retention pin for cover positioning |
| 0636302014 | SCREW PLUG | Seals oil fill or drain ports on the cover |
| 0634801057 | SEALING RING | Provides leak-proof joint between cover and housing |
| 4143301053 | CONNECTING PART | Links cover to hydraulic control block |
| 0636100600 | CAP SCREW | M8 fastener for cover mounting |
| 0636101024 | CAP SCREW | M10 fastener for heavy-duty applications |
| 0730365159 | TYPE PLATE | Identification label for transmission model |
