TM 5-3805-280-24-1
Theory of Operation
PROPEL MOTOR FAST SPEED OPERATION
A VALVE
B ROTARY
PLATE
GROUP
SERVO
TO MOTOR
D PISTON
CASE DRAIN
H
CHAMBER
"A"
I
G
FROM
SPRING
J MOTOR
PORT
C LINK
F
D SERVO
SPOOL
PISTON
K
FROM PROPEL
ORIFICE
SPEED CHANGE
E
SOLENOID
VALVE
M SUPPLY OIL
L CHAMBER
N PILOT OIL
"B"
O RETURN OIL
T102855
P FAST SPEED
9025
05
75
NOTE: For operation of propel speed change solenoid
In fast speed the pilot oil (N), from the propel speed
valve, see Proportional Solenoid Valve
change solenoid valve (K), is higher than spring force
Operation in this group. For circuit operation,
and spool (F) is pushed up. The oil in chamber "B" is
see Propel Motor Speed Change Circuit
routed to return through motor case drain (H). Supply
Operation in this group.
oil (M) from the motor port (J) is applied to chamber
"A", servo piston (D) moves down to reduce rotary
group (B) swash angle. With reduced swash angle the
piston stroke is reduced which increases rotary group
turning speed that increases propel speed.
TX,05,GG2169
1920MAY981/1
6-71
