Overview
The ZF 0501.208.764 GEAR PUMP is a critical hydraulic component engineered specifically for the WG 150 Series transmission. This OEM genuine part generates the necessary oil flow and pressure to actuate clutch packs, lubricate bearings, and cool internal assemblies within the gearbox. Positioned directly on the transmission housing, the pump draws fluid from the sump and delivers it through precision-machined galleries. The SKU 0501.208.764 is the exact replacement unit, ensuring factory-specified clearances and volumetric efficiency. When paired with a robust TRANSMISSION HOUSING or a TRANSMISSION HOUSING, this gear pump maintains consistent pressure across all operating temperatures.
Symptoms of Failure
- Delayed or erratic gear engagement: A worn gear pump cannot build adequate hydraulic pressure, causing hesitation when shifting into forward or reverse. This “transmission slipping when cold” symptom often worsens as the pump clearances increase.
- Low hydraulic pressure and whining noise: Cavitation or internal wear produces a high-pitched whine from the transmission pump area. Operators may notice “ZF transmission losing power under load” due to insufficient lubrication flow.
- External oil seepage at pump mounting flange: Degraded seals around the pump body lead to visible oil leaks. This “hydraulic oil leak near transmission bell housing” requires immediate attention to prevent contamination of the TYPE PLATE and surrounding components.
- Overheating transmission fluid: Reduced pump output diminishes cooling circulation, resulting in “transmission overheating during heavy hauling” scenarios. The fluid may appear dark or burnt.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.208.764 |
| Type | External Gear Pump |
| Housing Material | High-Strength Aluminum Alloy |
| Gear Material | Case-Hardened Steel |
| Weight | 2.85 kg (6.28 lbs) |
| Overall Length | 168 mm |
| Mounting Flange Diameter | 82 mm |
| OEM Reference | ZF 0501.208.764 |
| Seal Type | Viton Dual-Lip |
Compatibility
This gear pump is primarily designed for the ZF WG 150 Series transmission. It also serves as a direct replacement in the WG 180 and WG 200 models where the same pump mounting pattern and displacement are utilized. The unit interfaces with the GROOVED STUD for secure alignment. For WG 250 and WG 300 variants, verify the pump drive shaft spline count before installation. Always inspect the mating surfaces on the transmission housing for scoring or warpage when replacing this pump.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for pump mounting |
| 4642301168 | SCREEN SHEET | Fine mesh filter for suction line |
| 4642301169 | SCREEN SHEET | Alternate mesh filter specification |
| 0636100621 | HEXAGON SCREW | Fastener for pump cover plate |
| 0630361029 | SEALING CAP | Port plug for pressure test point |
| 4642306254 | ADAPTER | Mounting bracket for auxiliary pump |
| 0634303340 | O-RING | Seal between pump and housing |
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