Front and Rear Propel Pumps
(9) Axle interlock valve. (10) Drum interlock valve.
Valve (9) and valve (10) are located on the front propel pump
and the rear propel pump. Valve (9) and valve (10) are
solenoid operated valves. The valves drain the charge
pressure to the tank. No charge pressure is available for the
servo piston to move.