TM 5-3805-280-24-1
Theory of Operation
well as the outer spring. The pump supply oil pressure
The load spool (L) is moved by the load piston (M)
is sensed on one shoulder of the load piston and the
against the springs to decrease pump flow
pump supply oil pressure from the other pump is
(displacement) and avoid overloading the engine when
sensed on the other shoulder. The end of the load
main system pressure becomes too high. At lower
piston receives a reduced pilot oil control signal from
system pressures the spool is moved against only the
the speed sensing solenoid valve when the actual
outer spring (J). At higher pressures, the spool
engine speed pulls down to the target engine speed.
contacts and is moved against the inner spring (I) as
TX,05,GG2148
1919MAY982/2
9025
05
19
6-18
