ZF 4660.122.010 PRESSURE OIL PUMP for WG98 | OEM Genuine Part

Overview

The ZF 4660.122.010 PRESSURE OIL PUMP is a critical hydraulic component engineered specifically for the WG 98 Series transmission family. This OEM genuine part generates the necessary fluid pressure to actuate clutch packs, lubricate bearings, and maintain thermal stability within the gearbox. Mounted directly to the TRANSMISSION HOUSING, the pump draws oil from the sump and delivers it under precise pressure to the valve body and torque converter circuit. The SKU 4660.122.010 is the direct replacement for original equipment, ensuring factory-specified flow rates and pressure tolerances for heavy-duty commercial applications.

Symptoms of Failure

• Low hydraulic pressure and gear slipping: A worn pump rotor or scored housing reduces volumetric efficiency, causing delayed engagement or clutch slip under load.
• Erratic shifting and harsh engagement: Fluctuating oil pressure from a failing pump leads to unpredictable shift timing and jarring gear changes.
• Overheating transmission fluid: Insufficient oil circulation from a degraded pump accelerates thermal breakdown, often indicated by burnt-smelling fluid or elevated temperature gauges.
• Audible whining or grinding noise: Cavitation or worn internal gears produce a high-pitched whine from the pump area, especially during cold starts or at idle.

Technical Specifications

Compatibility

This pressure oil pump is designed for the ZF WG 98 Series, which includes the WG180, WG200, and WG210 transmission models commonly found in municipal buses, fire trucks, and heavy construction vehicles. It also fits select WG 98 variants used in off-highway equipment. Always verify the pump casting number against your existing unit, as the TYPE PLATE on the HOUSING II provides the definitive model identification. The pump is secured using a CYLINDRICAL PIN for precise alignment during installation.

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