TM 5-3805-281-24-1
Theory of Operation
pilot oil control signal to the hydraulic oil tank
Control Valve Spools in Neutral--When all the
decreases the control signal to the pump regulator.
control valve spools are in neutral the neutral passage
The decreasing pilot oil control signal causes the pump
(A) through the control valve is not restricted and all oil
displacement (flow) to decrease. The pumps are at
flow from the pump flows through the neutral passage
minimum displacement in neutral. (See Hydraulic
and pump control valve to the control valve return
Pump Regulator Operation in this group.) As the pump
passage (G). The oil flow shifts the flow sense spool
flow through the neutral passage decreases, the flow
(B) against the spring (C) connecting the passages so
sense spool is shifted back to the left by the spring.
the pilot oil control signal can flow from the pump
regulator (E) to the hydraulic oil tank (D). The flow of
Continued on next page
TX,9025,GG2512
1917NOV972/3
9025
05
54
6-53
