TM 5-3810-300-24 & P2
RT0613 GEAR RATIOS
Ratio
% Step
2.65
24
3.29
29
Intermediate
4.24
Range
28
5.43
28
6.96
Range Shift
27
8.83
28
11.31
28
Low Range
14.50
Slave Air Valve.
When in "low" and "intermediate" the control valve shuts off the air supply to the end cap. Thus, the constant air entering
at the constant supply port forces the piston to the rear. The constant air also flows through a channel in the center of the
piston and to an external port which is aligned with the low range port of the air valve.
When in "direct" the control valve opens and supplies air to the end cap. Since the piston area is larger on this end of the
piston, it is forced in the opposite direction. The external air port in the piston is now aligned with the direct range port of
the air valve.
Air Regulator and Filter Assembly.
The air regulator output should be 57 to 62 psi.
Range Control Valve.
There are four ports in the bottom of the control.
1. "S" port is the supply port and is the constant air lines from the air valve.
2. "E" port is the exhaust port and is left open.
3. "R" port is the signal line to the air valve.
4. "F" is the signal line to the intermediate shift cylinder.
Intermediate Shift Cylinder.
Constant, regulated air is channeled through the cover to the front side of shift piston - air is always on this side of piston.
The shift piston is moved by removing or applying air (from constant supply) to the backside of piston. This piston area is
4-28
