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Home > Ordnance Documents and other related manuals > > Figure 1-50. Priority Valve Hydraulic Circuit
Figure 1-49. Forward, Reserve, and Inhibitor Valve circuit.
Automatic  Shifts

Introduction to the X1100-3B Transmission, M1A1 Abrams Tank
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Figure 1-50.
Priority Valve Hydraulic Circuit.
d. Modulator Pressure Circuit (fig. 1-51).
The modulator valve
produces a regulated, reduced pressure from the signal main pressure.
When the engine throttle closes, a spring moves the valve to the
left.
When  the  engine  throttle  opens,  the  compressor  discharge
pressure actuator moves the valve to the right.  When spring force at
the right is in balance with the CDP at the left, modulator pressure
is regulated.
Increasing the throttle setting causes the CPD to move, forcing the
modulator valve to the right, and reducing the modulator pressure.
Decreasing  the  throttle  setting  decreases  the  force  on  the  CDP
actuator and allows the spring force to return the valve to the left,
increasing the modulator pressure.
Modulator pressure varies with
the throttle opening and closing.
Figure 1-51.
Modulator Pressure Circuit.
50
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