TM 5-3805-281-24-1
Theory of Operation
ENGINE SPEED SENSING CONTROL CIRCUIT OPERATION
9025
05
30
speed is a function of the engine and pump controller
The function of engine speed sensing control circuit
and is selected when the engine rpm dial (A) is turned
(G) is to reduce the hydraulic load on the engine if it
to the desired actual engine speed.
exceeds the output torque of the engine.
The pilot oil pressure signal is sent to the end of the
The speed sensing solenoid valve (C) coil is energized
load piston in the front and rear pump regulators (E
by an electrical signal from the engine and pump
and F) which then operate to reduce pump flow. (See
controller (B) when the actual engine speed, as
Hydraulic Pump Regulator Operation in this group.)
sensed by the engine speed sensor (D), is pulled
down to the target engine speed. The target engine
TX,05,GG2201 1902MAY981/1