ZF 4660.122.009 PRESSURE OIL PUMP for WG92/WG98 | OEM Genuine Part

Overview

The ZF 4660.122.009 PRESSURE OIL PUMP is a critical hydraulic component responsible for generating the necessary oil pressure to actuate clutches, lubricate bearings, and cool internal assemblies within the WG92 and WG98 transmission series. This OEM genuine part ensures precise volumetric flow and consistent pressure regulation, directly influencing shift quality and thermal management. The SKU 4660.122.009 mounts directly to the TRANSMISSION HOUSING and interfaces with the HOUSING II to form a sealed, high-efficiency pumping chamber. Without this pump, the transmission cannot maintain hydraulic command, leading to immediate operational failure.

Symptoms of Failure

• Delayed or harsh gear engagement: When the pump loses prime or internal clearances widen, you will notice a pronounced lag when shifting from Neutral to Drive or Reverse, often accompanied by a jarring engagement.
• Low line pressure and transmission slipping: A worn pressure oil pump cannot sustain the required hydraulic pressure, causing clutches to slip under load, especially during uphill climbs or heavy hauling.
• Audible whining or groaning noise: Cavitation or worn gears produce a high-pitched whine that increases with engine RPM, indicating the pump is struggling to draw oil from the sump.
• Overheating transmission fluid: Insufficient oil flow reduces heat dissipation, leading to rapid fluid degradation and potential thermal damage to seals and clutches.

Technical Specifications

Compatibility

This pressure oil pump is engineered for the ZF WG92 and WG98 series transmissions. It is also compatible with the following ZF models that share the same hydraulic architecture: WG180, WG200, WG210, and WG250. The pump is secured in place using a CAP SCREW 0636103273 and aligned with a CYLINDRICAL PIN 0631306174. Always verify the pump housing orientation against your specific transmission variant before installation.

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