Overview
The ZF 0501.214.844 PUMP is a critical hydraulic component engineered specifically for the WG 98 Series transmission family. This OEM genuine part serves as the primary fluid mover, generating the necessary oil pressure to actuate clutch packs, lubricate bearings, and maintain thermal stability within the gearbox. Positioned within the front pump housing, it directly interfaces with the torque converter hub to draw transmission fluid from the sump. The SKU 0501.214.844 is a direct replacement unit that restores factory-specified flow rates and pressure thresholds, ensuring reliable power transfer in heavy-duty industrial applications.
Symptoms of Failure
- Intermittent gear slipping under load: When the 0501.214.844 pump loses volumetric efficiency, hydraulic pressure drops, causing clutches to slip during acceleration or hill climbing.
- Persistent low-pressure warning codes: A worn pump rotor or damaged housing bores will trigger diagnostic trouble codes related to insufficient line pressure, often accompanied by harsh shifting.
- Audible whining or cavitation noise: Air ingestion from a failing pump seal produces a high-pitched whine that intensifies with engine RPM, indicating imminent pump failure.
- Overheating transmission fluid: Reduced flow rates from a degraded 0501.214.844 pump prevent adequate cooling, leading to fluid temperatures exceeding 120°C and accelerated wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.214.844 |
| OEM Reference | ZF 0501.214.844 |
| Material | Aluminum alloy housing with hardened steel gears |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 95 mm |
| Max Operating Pressure | 18 bar (261 psi) |
| Flow Rate at 1000 RPM | 22 L/min |
| Seal Type | Viton O-ring |
Compatibility
This pump is designed for the ZF WG 98 Series, which includes the WG180, WG200, and WG250 transmission models commonly found in municipal trucks, fire apparatus, and construction vehicles. It is also compatible with the WG98-2 and WG98-3 variants used in off-highway equipment. Always verify the pump cavity dimensions against your existing TRANSMISSION HOUSING and HOUSING II to ensure proper fitment. The 0501.214.844 replaces superseded part numbers 0501.214.843 and 0501.214.842.
During installation, the pump mounts directly to the TRANSMISSION HOUSING using a CYLINDRICAL PIN for alignment. After assembly, affix the TYPE PLATE to the housing for proper identification. Always replace the O-RING and O-RING seals during pump service to prevent external leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301056 | HOUSING II | Intermediate housing for pump mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for pump positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals pressure test ports |
| 4660221031 | SUCTION TUBE | Fluid intake conduit from sump |
| 0634100317 | O-RING | Seal for pump-to-housing interface |
| 0636103273 | CAP SCREW | Fastener for pump cover |
| 0634306311 | O-RING | Seal for suction tube connection |
| 4660321029 | FIXING PLATE | Retains pump in housing bore |
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