Overview
The ZF 0501.214.894 GEAR PUMP is a critical hydraulic component engineered for the WG 115, WG 130, WG 131, WG 158, WG 160, and WG 200 series transmissions. This OEM genuine part delivers precise oil flow to maintain clutch engagement and lubrication under load. Positioned within the pump housing assembly, the SKU 0501.214.894 directly interfaces with the TRANSMISSION HOUSING to generate consistent hydraulic pressure. Without this gear pump, the transmission cannot build the necessary torque converter charge pressure, leading to immediate operational failure.
Symptoms of Failure
- Erratic shifting or gear slipping under load: When the 0501.214.894 gear pump wears, hydraulic pressure drops, causing delayed engagement or complete loss of drive in forward or reverse gears.
- Audible whining or grinding from the transmission pump area: Worn gear teeth or scored pump plates produce a high-pitched noise that increases with engine RPM, indicating internal cavitation or metal-to-metal contact.
- Low transmission fluid pressure warnings or erratic gauge readings: A failing pump cannot maintain steady flow, triggering diagnostic trouble codes for insufficient line pressure, especially during cold starts or heavy towing.
- Visible metal debris in the transmission pan or on the magnet: Flaking from the gear pump’s hardened steel surfaces contaminates the hydraulic circuit, accelerating wear on the HOUS.FRONT SECT and valve body components.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | ZF 0501.214.894 |
| Pump Type | Fixed-displacement external gear pump |
| Material | Hardened alloy steel gears with aluminum housing |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Displacement | 14.5 cc/rev |
| Max Operating Pressure | 25 bar (362 psi) |
| Mounting Flange | SAE A 2-bolt pattern |
Compatibility
This genuine ZF gear pump is designed for the following transmission series: WG 115, WG 130, WG 131, WG 158, WG 160, and WG 200. It replaces earlier pump variants in these models and is fully compatible with both standard and heavy-duty torque converter configurations. The 0501.214.894 mounts directly to the HOUSING REAR PART (4656201034) and the alternative HOUSING REAR PART (4472239177) used in later production runs. Verify your transmission’s serial number to ensure correct fitment, as pump drive tang dimensions vary between WG 115 and WG 200 series units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101032 | TRANSMISSION HOUSING | Main structural casing that encloses the gear pump and valve body |
| 4656201075 | HOUS.FRONT SECT | Front section housing the pump drive and input shaft bearings |
| 4656201034 | HOUSING REAR PART | Rear housing that supports the pump outlet and cooler return passages |
| 4472239177 | HOUSING REAR PART | Alternate rear housing variant for later WG 160/200 series |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise pump-to-housing positioning |
| 0636100817 | CAP SCREW | M10 bolt securing the pump to the front housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting the pump inlet from debris |
| 4656301017 | SCREEN SHEET | High-flow screen sheet for heavy-duty applications |
| 0636100803 | CAP SCREW | M8 bolt for pump cover retention |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing directing pump output to the valve body |
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