Intermediate Shift Cylinder Assembly 613 and 6613, 3-Position Selector Valve Intermediate Shift Cylinder Assembly

Intermediate Shift Cylinder Assembly 613 and 6613, 3-Position Selector Valve

LO Range - With the Selector valve button in the "LO" position, no air is supplied to the Intermediate cylinder cover center port (1). The constant air from the air filter/regulator assembly (2) moves the piston forward (3), disengaging underdrive/overdrive gearing.

Intermediate or Direct Range - With the Selector valve button in the "INT" or "DIR" position, air is supplied to the Intermediate cylinder cover center port (1), moving the piston rearward, engaging underdrive/overdrive gearing (2).

Insert Valve

The insert valve is a self-contained 1-13/16" valve assembly located in the intermediate cylinder cover. It cannot be disassembled except for the three (3) O-rings on the outer diameter. The O-rings provide a stationary seal and do not move in the cylinder.

Insert valve piston travel is only 1/32". When no air is applied to the valve piston top side, constant air supplied from the air filter/ regulator passes freely through the insert valve and to the cylinder piston backside, moving the yoke bar forward to disengage underdrive/overdrive gearing.

When air is applied to the valve piston top side through the signal line, the piston moves down to cut off air supplied to the cylinder piston backside. This air is exhausted out the cover bottom port when constant air supplied from the regulator is directed to the cylinder piston front side, moving the yoke bar rearward to engage intermediate or direct gearing.

LO Range

No air on Signal Line

To piston back side, yoke bar forward Constant Air

Intermediate Range and Direct Range Air on Signal Line

Air exhausted through bottom port from piston back side Constant Air

Constant air sealed off at this point