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TM 10-4320-343-14
As pump begin to pump, reduce engine speed and reduce
discharge valve opening to prevent hydraulic shock to
system when line is filled too fast, causing hose rupture
a n d f i t t i n g f a i l u r e .
When pump picks up prime, a change in engine RPM will be
noted.
Depending on pumping conditions, pump may not take
suction immediately.
Suction line must be filled with
liquid before the pump takes suction.
g.
If after a reasonable time pump fails to take suction, shutdown engine and
check suction line for leaks,
then repeat steps d, e and f(3) through f(5) .
h.
Refer to figure 4-56 and perform the following adjustments:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
Turn potentiometer "A" slowly clockwise until actuator lever oscillates
r a p i d l y .
Turn potentiometer "A" slowly counterclockwise until
o s c i l l a t i o n s t o p s.
Upset actuator by tapping on actuator lever.
If actuator lever
oscillates rapidly, turn potentiometer "A" slowly counterclockwise until
o s c i l l a t i o n j u s t s t o p s.
If actuator lever is unstable (hunting),
turn GAIN potentiometer slowly
counterclockwise until stable.
Slight movement of lever with a constant
engine speed indicates normal speed governing is occurring and not
hunting.
Upset actuator lever by tapping on lever.
Engine should return quickly
to its regulator speed without hunting.
Turn potentiometer "D" clockwise until actuator lever begins to hunt.
Actuator lever may have to be tapped to start hunting
Turn potentiometer "D" slowly counterclockwise until engine is stable.
Turn Mode Selector to MANUAL position and rotate Manual Speed Control to
mid-range.
Rotate Manual Speed Control to HIGH and quickly move Mode Selector to
AUTO position.
Engine speed must not overshoot its maximum speed of 2400 RPM.
If speed
exceeds 2400 RPM, rotate potentiometer “I” counterclockwise.
Repeating step (8) and (9) until engine no longer overshoots its maximum
speed.
Place Mode Selector to MANUAL position and rotate Manual Speed Control to
LOW position.
Check Idle speed for 800 RPM.
If not 800 RPM adjust
until 800 RPM is indicated.
i .
Refer to paragraph 2.5 and shut down engine.
j .
Install control box cover (figure 4-55, 3), washers (2),
SPEED potentiometer
and screws (1).
4-106
NOTE
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