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Home > Ordnance Documents and other related manuals > > Main Pressure Regulator
Figure 1-18. Output Pump Check Valve
Figure 1-21. Solenoid Operation

Introduction to the X1100-3B Transmission, M1A1 Abrams Tank
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d. Main Pressure Regulator.
This valve assembly consists of a
regulator  valve  (housing  a  check  ball,  spring,  and  retainer),
calibrated spring, and a reverse boost valve in a bore.
This valve establishes a main pressure schedule.
Oil from the main
pressure pump flows through an orifice to the upper end of the valve
and  pushes  down  on  the  top  of  the  valve  against  the  calibrated
spring.
This pressure on the spring controls the oil flow through
the regulator valve.  Oil from the main pressure pump also flows into
the valve bore and through an internal passage to the upper end of
the valve.
When high fluctuations in pressure from the main pressure pump occur,
hydraulic pressure offsets the check ball and pushes down on the
valve, correcting the main pressure schedule.
This continues until
oil pressure flows through the orifice, directing pressure to the
upper end of the regulator valve, or until the high fluctuations
diminish.
Three pressures change the main pressure schedule:
lockup, brake
apply, and reverse pressure.
Upon application of lockup pressure,
the  regulator  valve  moves  down,  decreasing  main  pressure.
When
applying  brake  apply  or  reverse  pressure  to  the  bottom  of  the
regulator valve, the valve moves up, increasing main pressure.
e. Signal Main Regulator Valve (fig. 1-20).
The signal main
regulator consists of a valve assembly, with a check ball and spring
retainer, and a calibrated spring in a bore.  This valve establishes
regulated pressure for control functions.
Main pressure feeds into
the valve bore and through an internal passage to the left of the
valve.  Pressure at the left end forces the valve right against the
calibrated spring force, establishing signal main pressure.
f. Solenoid  Controls  (fig.  1-21).
Nine  identical  solenoids
control pressure at the end of various hydraulic operating valves.
These solenoids are identified as A, B, C, D, E, H, J, K, and X.
Energizing a solenoid causes a plate (which is normally holding a
check ball down) to lift and allows hydraulic pressure to raise the
ball and relieve pressure through an orifice in the solenoid.
The
solenoid  orifice  relieves  hydraulic  pressure  faster  than  the  oil
supplied through the control orifice.
If the solenoid is not energized, pressure increases and moves the
valve against the exerted pressure on the opposite end of the valve.
28
OD1710






Western Governors University

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