Overview
The ZF 0501.211.637 PUMP is a critical hydraulic component engineered for the WG200, WG92, and WG98 transmission series. This genuine OEM part generates the necessary oil flow and pressure to actuate clutch packs, lubricate internal gears, and cool the transmission under heavy-duty cycles. Mounted directly to the TRANSMISSION HOUSING, it draws fluid through the SUCTION TUBE and delivers it to the valve body and torque converter. The SKU 0501.211.637 is a direct replacement for the original factory pump, ensuring precise volumetric output and sealing integrity.
Symptoms of Failure
- Low hydraulic pressure and gear slipping – As the pump wears, internal clearances increase, causing pressure drop. Operators often notice delayed engagement or slipping under load, especially in WG200 series transmissions.
- Oil leaks around the pump housing – A failing O-RING or worn pump body can allow ATF to weep from the mounting flange. This is commonly misdiagnosed as a pan gasket leak.
- Whining or cavitation noise – Air ingestion from a damaged suction tube or worn pump gears produces a high-pitched whine. This symptom worsens when the fluid is cold or low.
- Erratic shift timing – Inconsistent pump output confuses the RANGE SELECTOR, leading to harsh or delayed shifts. This often triggers fault codes in electronic controls.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.211.637 |
| Type | Gerotor / Gear Pump |
| Material | Aluminum housing, hardened steel gears |
| Weight | 2.1 kg (4.6 lbs) |
| OEM Reference | ZF 0501.211.637 |
| Displacement | 14.5 cc/rev (estimated) |
| Max Pressure | 18 bar (261 psi) |
| Mounting Bolts | 4x M8 (use CAP SCREW 0636103273) |
Compatibility
This pump is designed for ZF WG180, WG200, WG92, and WG98 series transmissions. It also fits select WG120 variants with the same pump mounting pattern. The 0501.211.637 replaces older pump versions and works with the PERIPHERALS kit for full hydraulic circuit restoration. Always verify the TYPE PLATE on your transmission before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Seal and gasket kit for pump installation |
| 0501209818 | RANGE SELECTOR | Hydraulic valve assembly for gear selection |
| 4660101011 | TRANSMISSION HOUSING | Main casing that houses the pump |
| 4660301018 | HOUSING | Rear cover or auxiliary housing |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for pump positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 4660221012 | SUCTION TUBE | Fluid intake pipe from pan to pump |
| 0634100317 | O-RING | Seal between pump and housing |
| 0636103273 | CAP SCREW | Mounting bolt for pump flange |
| 0750100022 | SCREW PLUG | Port plug for pressure testing |
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