a. See figure 13-3 to perform the valve and piston
test.
b. Connect dc power supply (ps) and switch (S1)
to J6 as illustrated. Connect voltmeter (Ml) with
resistor (Rl) to pins A and B of J4.
c. Attach gage G1 and G2 as shown. Connect hy-
draulic power source (310-320 psi, 2 gpm) and gage
G3 and provide a return line from port R to the
hydraulic sump.
d. To adjust the valves, remove the large round
cover and replace it with a similar diameter collar
which will allow access to the adjustment screws and
jam nuts. This is necessary to contain the hydraulic
fluid which is ported within this cover.
e. With hydraulic power but no electric power,
applied, adjust the valve with Allen set screw to
yield 200 psi - 10 psi at Al port (gage Gl) and 150 psi
+ 10 psi at A2 port (gage G2). (See figure 13-3.)
CAUTION Avoid overadjusting to prevent press-
ures or forces which could bend valve push rods.
f. After adjusting, lock Allen adjusting screws
with jam nuts, and install cover.
g. Set S1 to the center position (solenoid coils in
series). Apply 350 ± 20 ma through the coils. Pre-
ssures at Al and A2 ports shall remain the same
(para 13-6.e).
h. Set switch Sl to connect power (PS) to coil L2
and apply 700 ma ± 40 ma. Pressure at Al port
(gage Gl) shall be 310 to 400 psi. pressure at A2
port (gage G2) shall be 0 to 20 psi.
i .
Set switch Sl to connect power (PS) to coil L1
and apply 700 ma ± 40 ma. Pressure at Al port
(gage Gl) shall be 0 to 40 psi and pressure at A2
port (gage G2) shall be 310 to 400 psi.
13-7. Throttle Position Transducer Test.
a. With voltmeter (Ml), resistor (Rl) and 120
(+ 1%, 60 Hz) power source connected as shown in
figure 13-3, move piston to fully open throttle pos-
ition.
b. With the transducer body locked in place by
its set screw, loosen the transducer core set screw
and move the core relative to the body until a min-
imum voltage (0, 5 to 2.5 volts) is obtained on the
transducer secondary, as indicated on Ml.
c. Move the piston gradually towards the fully
closed throttle position.
The transducer secondary
voltage, indicated by meter Ml shall increase in a
linear manner to a maximum of 48 to 55 volts.
d. Repeat these adjustments until the transducer
secondary voltage increases linearly from the low-
est possible value to a maximum value over the
entire 1.0 inch displacement of the piston.
e. When final adjustment is made, lock the trans-
ducer core in place with the transducer core set
screw.
f. Remove the gages, meter, and power supplies.
13-8. Installation.
a. Install the hydraulic actuator with attaching
hardware. (fig. 13-1.)
b. Connect hydraulic pressure and return lines to
theactuator pressure and return parts. Different
line sizes prevent inadvertent crossing of lines.
(fig. 13-2. )
C. Connect electrical connectors J24 and J25.
Electrical connectors cannot be interchanged due to
differing number of pins. (fig. 13-2.)
d.
13-9
13-9.
a.
Attach rod-ends, shaft and clevis.
Adjust the linkage in accordance with para.
Throttle Linkage Adjustment.
Place the Stop-Run-Start switch in the RUN
position. (DO NOT- start the set.)
b. Place the battle short switch in the OVER-
RIDE or UP position.
c. Remove the bolt connecting the linkage rod to
the fuel injection pump shut-off arm.
d. Starting at the full counter clockwise position,
move the fuel injection pump shut -off arm clockwise
until a slight resistance is felt. When this resistance
is felt, hold the shut-off arm in that position.
NOTE
This resistance is the fuel injection
pump linkage coming into contact
with the arm which moves the met-
ering valve and starts in the direc-
tion of no fuel.
e. Move the actuator piston to the full OPEN
(DOWN) position.
f. Make the necessary adjustment to the link-
age rod, such that it will fit between the actuator
piston and the fuel injection pump shut-off arm.
g. Start the generator set. Refer to the Operator
and Organizational Maintenance Manual.
h. Observe the frequency meter on the panel in
the control cubicle.
13-4