TM 5-3805-280-24-1
Theory of Operation
HYDRAULIC PUMP REGULATOR SUMMATION AND SPEED SENSING OPERATION
27 PILOT OIL
28 REDUCED PILOT OIL
29 REAR PUMP SUPPLY OIL
30 FRONT PUMP SUPPLY OIL
31 CONTROL VALVE
FROM SOLENOID 1
VALVE MANIFOLD
NEUTRAL PASSAGE OIL
2
CONTROL VALVE
32 RETURN OR PRESSURE
NEUTRAL PASSAGE
FREE OIL
REAR PUMP
CONTROL 3
REMOTE
VALVE
CONTROL
TO SERVO
SPOOL
REMOTE
PISTON
CONTROL 7 PISTON
LARGE END 4
5
SLEEVE
26 PRESSURE
SENSOR
6
RETURN
TO PUMP
8 PILOT OIL
HOUSING 14
INLET
SPEED SENSE 13
SIGNAL PORT
9025
05
PUMP PRESSURE 12
24
INLET
LOAD PISTON 11
9 LOAD SLEEVE
15 FEEDBACK LINK
LOAD SPOOL 10
16 TO LEFT CONTROL VALVE
TO FRONT PUMP
TO RIGHT CONTROL VALVE 25
17 REGULATOR
TO FRONT PUMP 24
REGULATOR
18
PILOT
PUMP
19
22
23
PILOT
20
FRONT
PRESSURE
SERVO
REAR
PUMP
REGULATING
PISTON
PUMP
21
VALVE
SERVO
PISTON
33 PUMP FLOW INCREASING
T108969
Continued on next page
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