Overview
The ZF 0501.208.651 PUMP is a critical hydraulic component engineered specifically for the WG 100 and WG 110 series transmissions. This OEM genuine part serves as the primary fluid mover, delivering pressurized oil to the torque converter, clutch packs, and lubrication circuits. Located within the transmission’s lower valve body area, the pump ensures consistent hydraulic pressure for smooth gear engagement and reliable power transfer. The SKU 0501.208.651 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: When the pump loses prime or internal clearances increase, hydraulic pressure drops, causing hesitation or harsh shifts during acceleration.
- Audible whining or grinding noise from the transmission: A failing pump often produces a high-pitched whine as cavitation occurs, particularly under load or at low fluid levels.
- Overheating transmission fluid: Reduced pump output leads to insufficient lubrication and cooling, resulting in elevated operating temperatures and potential thermal damage.
- Visible oil leaks near the pump housing interface: Worn seals or a cracked pump body can cause fluid to seep from the joint between the pump and the TRANSMISSION HOUSING.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0501.208.651 |
| OEM Reference | ZF 0501.208.651 |
| Material | High-strength aluminum alloy with hardened steel gears |
| Weight | 2.4 kg (5.3 lbs) |
| Dimensions (L x W x H) | 185 mm x 120 mm x 95 mm |
| Flow Rate | 18 L/min at 1500 RPM |
| Maximum Pressure | 18 bar (261 psi) |
| Seal Type | Integrated O-ring groove for O-RING seal |
Compatibility
This pump is designed for ZF WG series transmissions, including the WG100, WG110, WG180, and WG200 models. It also fits select WG120 and WG150 variants where the hydraulic pump mounting pattern matches the HOUSING interface. For proper installation, ensure the mating surfaces on the HOUSING are clean and free of debris. Always replace the O-RING during pump service to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing that encloses the pump and gear train |
| 4651301029 | HOUSING | Intermediate housing supporting pump alignment |
| 0634303928 | O-RING | Seals pump-to-housing joint against fluid leaks |
| 4651301024 | HOUSING | Secondary housing for valve body integration |
| 4651203002 | SCREEN SHEET | Filters debris from pump inlet flow |
| 4651303005 | SCREEN SHEET | Secondary filtration for hydraulic circuit |
| 0636101032 | CAP SCREW | Fastens pump assembly to transmission housing |
| 0630361028 | SEALING CAP | Protects pump port during storage or transport |
| 4475280060 | SCREW PLUG | Closes unused hydraulic ports |
| 0634303312 | O-RING | Seals screw plug against fluid leakage |
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