Overview
The ZF 0501.008.748 PUMP is a critical hydraulic component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part generates the precise oil flow and pressure required to actuate clutch packs, lubricate planetary gearsets, and maintain thermal stability within the transmission housing. As the heart of the hydraulic control system, the 0501.008.748 pump ensures consistent torque delivery and smooth gear engagement under heavy-duty operating conditions. When servicing this assembly, technicians frequently inspect the 2093109002: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING for correlated wear patterns.
Symptoms of Failure
- Erratic gear engagement or delayed shifting — A worn pump cannot maintain adequate line pressure, causing hesitation when moving from neutral into drive or reverse.
- Low hydraulic pressure warnings or transmission overheating — Insufficient oil volume from a failing 0501.008.748 leads to elevated sump temperatures and dashboard alerts.
- Audible whining or groaning from the transmission pan — Cavitation or worn pump gears produce distinct mechanical noises that intensify under load.
- Visible oil leaks near the pump mounting flange — Deteriorated seals allow pressurized ATF to escape, leaving puddles beneath the vehicle.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.008.748 |
| Type | Gerotor / Gear Pump |
| Housing Material | High-Strength Aluminum Alloy |
| Weight (approx.) | 2.8 kg (6.2 lbs) |
| Displacement | 18.5 cc/rev |
| Max Operating Pressure | 22 bar (320 psi) |
| OEM Reference | ZF 0501.008.748 |
| Seal Material | Nitrile (Buna-N) |
Compatibility
This pump is factory-specified for ZF WG100, WG130, and WG131 powershift transmissions commonly found in agricultural tractors, wheel loaders, and industrial forklifts. It is not cross-compatible with WG180 or WG200 series units due to differing mounting flange patterns and pressure ratings. During a full rebuild, the 2093209095: DIFFERENTIAL and the 2093309071: DIFF.HOUSING should be inspected for scoring or fretting caused by contaminated fluid.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109002 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating shaft loads |
| 2093209095 | DIFFERENTIAL | Secondary torque distribution unit |
| 2093309071 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Secures pump alignment dowels |
| 0730300820 | THRUST WASHER | Controls axial clearance in gear train |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to final drive |
| 5838300811 | THRUST WASHER | Reduces friction on planetary carrier |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Provides speed differentiation between wheels |
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