Overview
The ZF 4143.342.104 PUMP COVER is a critical hydraulic component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part seals and protects the pump assembly within the transmission housing, ensuring consistent oil flow and pressure regulation for smooth gear engagement. As a precision-machined cover, it prevents contamination ingress and maintains hydraulic integrity. The SKU 4143.342.104 is a direct replacement for original equipment, designed to meet ZF’s exacting tolerances. When installed alongside the 4143101022: HOUSING and 4143301044: HOUSING, this pump cover forms a sealed unit that supports the transmission’s hydraulic circuit.
Symptoms of Failure
When the ZF 4143.342.104 pump cover wears out, operators may notice these specific failure indicators:
- External oil seepage around the pump mounting area – A worn cover gasket or cracked housing leads to visible fluid leaks, often mistaken for a failing pump seal.
- Erratic gear engagement or delayed shifting – Loss of hydraulic pressure from a compromised cover causes sluggish clutch pack activation, especially under load.
- Whining or cavitation noise from the transmission pump – Air entering the system through a damaged cover creates a high-pitched sound during operation.
- Overheating transmission fluid – Insufficient pump pressure due to cover failure forces the system to work harder, raising fluid temperatures beyond normal ranges.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4143.342.104 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 185 mm x 120 mm x 35 mm |
| OEM Reference | ZF 4143.342.104 |
| Sealing Surface | Precision-ground flatness to 0.02 mm |
| Fastener Torque Spec | 25 Nm (18.4 ft-lbs) |
Compatibility
This pump cover is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits select HL 100 and HL 270 series units where the pump assembly shares identical mounting patterns. For WG180, WG200, and WG210 transmissions, verify pump housing compatibility with the 4143301053: CONNECTING PART and 0636302014: SCREW PLUG to ensure proper sealing. Always cross-reference your transmission serial number with the OEM part list before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101022 | HOUSING | Encloses the pump and gear assembly |
| 4143301044 | HOUSING | Secondary housing for hydraulic passages |
| 0631329135 | SPRING PIN | Aligns and secures cover to housing |
| 0636302014 | SCREW PLUG | Seals oil ports in the pump cover |
| 0634801057 | SEALING RING | Prevents fluid leaks at mating surfaces |
| 4143301053 | CONNECTING PART | Links pump cover to transmission housing |
| 0636100600 | CAP SCREW | Fastens cover with M10 thread |
| 0636101024 | CAP SCREW | Fastens cover with M12 thread |
| 0730365159 | TYPE PLATE | Identifies transmission model and specs |
| 0631311009 | GROOVED STUD | Provides alignment for cover installation |
