TM 5-3805-281-24-1
Theory of Operation
HYDRAULIC PUMP REGULATOR COMPONENTS OPERATION
FLOW ADJUSTING
REMOTE
MAXIMUM FLOW REMOTE
MINIMUM FLOW
CARTRIDGE
CONTROL
CONTROL
ADJUSTING
ADJUSTING
(TRACK CYCLE
PISTON
SPOOL
SLEEVE
SCREW
SCREW
TIME)
A
B
C
D
E
F
G LOAD
ADJUSTING
SCREW
M
L
K
J
I
H
(INNER SPRING)
(ENGINE
LOAD
LOAD
OUTER INNER LOAD
LOAD
PULLDOWN AT
SLEEVE
PISTON
SPRING SPRING ADJUSTING
SPOOL
HIGH PRESSURE)
CARTRIDGE
(OUTER SPRING)
(ENGINE
9025
PULLDOWN AT
05
MEDIUM PRESSURE)
T114627
N PUMP REGULATOR COMPONENTS
18
on the end of the piston (E) to control the position of
The pump regulators are mounted on the top of the
remote control spool against the spring.
hydraulic pump housings. The major pump regulator
components (N) are the flow adjusting cartridge (A),
The load spool (L) is moved by the load piston (M)
maximum flow (displacement) adjusting screw (B),
against the springs to decrease pump flow
remote control sleeve (C), remote control spool (D),
(displacement) and avoid overloading the engine when
piston (E), minimum flow (displacement) adjusting
main system pressure becomes too high. At lower
screw (F), load adjusting screw (inner spring) (engine
system pressures the spool is moved against only the
pull down at high pressure) (G), load adjusting
outer spring (J). At higher pressures, the spool
cartridge (outer spring) (engine pull down at medium
contacts and is moved against the inner spring (I) as
pressure) (H), inner spring (I), outer spring (J), load
well as the outer spring. The pump supply oil pressure
sleeve (K), load spool (L), and load piston (M). Each
is sense on one shoulder of the load piston and the
regulator controls the flow of pilot oil to the large end
pump supply oil pressure from the other pump is
of its servo piston using the spools and sleeves.
sensed on the other shoulder. The end of the load
piston receives a reduced pilot oil control signal fro the
The remote control spool (D) is moved by a reduced
speed sensing solenoid valve when the actual engine
pilot oil control signal from the front and rear pump
speed pulls down to the target engine speed.
control valve. The pump control valves are located in
the left and right control valves. The control signal acts
CED,TX08227,3045
1931MAR981/1