TM 5-3805-281-24-1
Theory of Operation
PROPORTIONAL SOLENOID VALVE MANIFOLD OPERATION
TO
TO PUMP REGULATORS
HYDRAULIC J
SPEED SENSING PORT
OIL TANK
K
TO ARM
I
L REGENERATIVE
TO PROPEL
SPEED CHANGE
VALVE
VALVE
TO SYSTEM H
A SOLENOID
RELIEF VALVE
VALVE
MANIFOLD
POWER G
BOOST
PROPEL
SPEED F
CHANGE
SPEED E
B FROM PILOT
SENSING
D
SHUT-OFF
ARM
C FROM ARM
VALVE
REGENERATIVE
REGENERATIVE
FROM ARM HEAD
VALVE
END REDUCED
H
K
B
R
LEAKAGE VALVE
DR PORT
A
DP DG
SG
SE
SD
PF
9025
05
PG
25
P
TO SWING
FROM PILOT
Q PARK BRAKE
SHUT-OFF
RELEASE
G
E
VALVE
VALVE
PI
POWER
SPEED
TO REAR
BOOST
SENSING
S PUMP CONTROL
VALVE IN LEFT
CONTROL VALVE
C
DD
PH
ARM
REGENERATIVE
DE
PE
D
TO FRONT
U
V PUMP CONTROL
FROM BUCKET
VALVE IN RIGHT
FLOW CONTROL
CONTROL VALVE
PILOT VALVE B
PROPEL
SPEED F
CHANGE
DS DH
SI
PD
SC
PILOT OIL
T FROM BUCKET
J
I
L
FLOW CONTROL
RETURN OR
PILOT VALVE A
PRESSURE
FREE OIL
O SOLENOID VALVE MANIFOLD
T115177
Continued on next page
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