Automatic Transmission Filters

Clogged transmission filter

The transmission oil filter removes damaging debris from the automatic transmission fluid. They get clogged with this debris in time. This is why they are replaced during regular service intervals. Steel mesh screen and surface filters are particularly vulnerable to blockage. This drop in flow and pressure results in transmission oil pump starvation and low line pressure.

The filter’s located in the transmission's oil pan and mounted to the valve body. It cleans the fluid before it enters the pump and travels through the lubrication system. This protects the oil pump, transmission shafts, bushings and bearings from harmful debris. Additional filters are sometimes included in the transmission cooler line providing additional protection.

Transmission fluid is drawn through the filter before entering the valve body. A restriction in the filter results in reduced flow and pressure to the valve body. This results in delayed initial engagement.