The transmission hydraulic control system is composed of a pump, filter, series of valves, and a control lever and linkage mechanism. The hy¬draulic control system directs oil to the clutches in the transmission.
The pump (15) delivers oil to the full flow oil filter (7). If the filter element becomes clogged, a filter bypass valve opens and allows the oil to flow unrestricted to the hydraulic control valve.
From the filter, oil is directed to the control valves in the top compartment of the transmissioncase. The first valve the oil contacts is the speed selector valve (5). The valve is a four position spool valve which is positioned by mechanical linkage to direct oil to one of the three speed clutches (No. 3, No. 4, or No. 5). A parallel passage in the speed selector valve body directs the oil flo พ to the pressure control valve body (14). This passage also supplies oil to the converter ratio valve (8) to charge the torque converter (23).