TM 5-3805-281-24-1
Theory of Operation
SYSTEM RELIEF VALVE AND POWER BOOST OPERATION
9025
05
For power boost operation, the pilot oil control signal
The function of system relief valve (Q) is to limit the
46
from the power boost solenoid valve or the propel pilot
main hydraulic system operating pressure. The system
signal passage flows through the power boost pilot
relief valve is pilot-operated poppet type relief valve.
signal passage (L) to push the piston (F) to the left
The relief valve senses supply oil pressure in the
increasing the pressure setting of the pilot poppet
control valve power passages (P). The pressure
spring (E).
setting for the system relief valve and power boost are
adjusted by the adjusting plug (G) and adjusting screw
(H). The relief valve is located at the top right front
corner of the control valve.
Continued on next page
TX,9025,GG2505
1917NOV971/3