Overview
The ZF 0501.214.611 GEAR PUMP is a precision-engineered hydraulic component responsible for generating the oil flow and pressure required to actuate clutch packs and lubrication circuits within the WG258, WG261, and WG308 series transmissions. This OEM genuine part, identified by SKU 0501.214.611, mounts directly onto the TRANSMISSION HOUSING and draws fluid from the sump. Its internal meshing gears create a steady, high-volume flow that is critical for shift quality and thermal management. When this pump degrades, the entire hydraulic system loses its foundation, leading to erratic operation and potential overheating.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn 0501.214.611 pump cannot build sufficient pressure, causing noticeable lag when shifting from Neutral to Drive or Reverse.
- Intermittent transmission slipping under load: As the pump loses volumetric efficiency, the clutch packs fail to hold torque, resulting in RPM flare during acceleration.
- Low hydraulic pressure warning or erratic oil flow: Internal wear or cavitation reduces output, often triggering diagnostic trouble codes for insufficient line pressure.
- Visible oil leaks near the pump mounting face: Seal failure around the gear pump body allows fluid to escape, typically pooling around the HOUSING interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.214.611 |
| OEM Reference | ZF 0501.214.611 |
| Pump Type | External gear pump, fixed displacement |
| Material | High-strength cast iron body with hardened steel gears |
| Weight | Approx. 3.2 kg (7.1 lbs) |
| Overall Length | 185 mm |
| Overall Width | 95 mm |
| Overall Height | 110 mm |
| Mounting Bolt Pattern | 4-hole, M10 thread (use HEXAGON SCREW and CAP SCREW) |
| Seal Type | Integrated lip seal with O-ring groove |
Compatibility
This gear pump is engineered for the ZF WG series of powershift transmissions. It is a direct fit for the WG258, WG260, WG261, WG308, WG310, and WG311 models. Additionally, it is commonly used in the WG180, WG200, and WG250 series when specified with the high-flow hydraulic option. Always verify the pump cavity depth and drive tang configuration against your existing unit. The pump mounts securely using HEXAGON SCREW fasteners and CAP SCREW hardware, which should be replaced during installation to prevent loosening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101156 | TRANSMISSION HOUSING | Main structural casing that supports the gear pump and shaft assemblies |
| 4646301327 | HOUSING | Intermediate housing that seals the pump cavity and aligns the drive gear |
| 0636015304 | HEXAGON SCREW | M10 bolt used to secure the pump to the housing flange |
| 0636101828 | CAP SCREW | Socket head fastener for pump cover retention |
| 4646301102 | COVER SHEET | Thin gasket plate between pump and housing |
| 4646301285 | COVER SHEET | Alternate gasket for different pump depth variants |
| 0730365190 | TYPE PLATE | Identification label for pump specifications |
| 0631311009 | GROOVED STUD | Alignment dowel for precise pump positioning |
| 0636101193 | CAP SCREW | M8 socket screw for auxiliary pump cover |
| 0636010179 | HEXAGON SCREW | M12 bolt for heavy-duty pump mounting |
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