JLG 660SJ ANSI Service Manual - Manual (Page 164)

SECTION 4 - BOOM & PLATFORM
4-28 – JLG Lift – 3120718
Lift, Swing, and Drive Cards
1. Center the input potentiometers. Power up the card,
but do not start the engine. Place the common lead
of a voltmeter on pin #6 and place the other lead on
pin #8. Rotate the potentiometer, leaving the joy-
stick in the center position, until the voltmeter reads
2.5 volts. Secure the set screw on the potentiometer.
When the potentiometer is centered and the joystick
is in the center position, LED #3 should not be illu-
minated.
2. Install test harness JLG P/N 4922012.
3. Set the minimum and maximum currents. The input
potentiometer must be centered before continuing
with this procedure. Power up the card, but do not
start the engine. Place the current meter in series
with the “A” output. Turn P3 counter clockwise until
the adjustment potentiometer starts to click. This will
set to maximum current to its lowest value. Move the
joystick until LED #3 illuminates and hold the stick in
this position. Adjust P4 until the meter equals the
setting given in table #1. Rotating the adjustment
potentiometer clockwise will increase the current.
This will set the minimum current setting for the “A”
output. To set the maximum current for the “A” out-
put, hold the joystick in its maximum position. Turn
P3 clockwise until the meter reading equals the set-
ting in table #1. Follow the same procedure for the
“B” output. Use P8 for the minimum current adjust-
ment and P7 for the maximum current adjustment.
4. Set the ramp up and the ramp down times. Step 2
must be performed before continuing with proce-
dure. Power up the card, but do not start the engine.
Place the current meter in series with the “A” output.
Move the joystick from the center position to the
extreme position. Watch the meter for the time it
takes the output to go to from 0 current to maximum
current. This is the ramp up time. Adjust P1 until this
time matches the time given in table 2. Rotating the
adjustment potentiometer clockwise will increase
the ramp time. To set the ramp down time, hold the
joystick in the extreme position. Release the joystick
and watch the meter for the time it takes the output
to go from the maximum current setting to 0 current.
Adjust P2 until this time matches the time in table 2.
Rotating the adjustment potentiometer clockwise
will increase the ramp time. Follow the same proce-
dure for the “B” output. Use P5 for the ramp up
adjustment and P6 for the ramp down adjustment.
Flow Control Card
1. Set the input potentiometer. Power up the card, but
do not start the engine. Place the common lead of a
voltmeter on pin #15 and place the other lead on pin
#8. Rotate the potentiometer and verify the input to
the card is 3.8 volts when the input potentiometer is
in its minimum position. Rotate the input potentiom-
eter to its maximum position and verify the input to
the card is 0 volts.
2. Set the minimum and maximum current settings.
The input potentiometer must function properly
before continuing with this procedure. Turn P3
counter clockwise until the adjustment pot starts
clicking. Place a current meter in series with the “A”
output. Rotate the input potentiometer to its mini-
mum setting and operate the telescope function.
Adjust P4 until the meter reading matches the set-
ting in table 1. This sets the minimum current setting
for the card. Rotate the input potentiometer to its
extreme position and operate the telescope func-
tion. Turn P3 clockwise until the meter reading
matches the setting in Table 1. This sets the maxi-
mum current for the card.
3. Set the ramp up and the ramp down times. Step 2
must be completed before continuing with this pro-
cedure. Power up the card, but do not start the
engine. Place the current meter in series with the “A”
output. Turn the input potentiometer to its extreme
position and operate the telescope function. Watch
the meter for the time it takes the output to go from 0
current to maximum current. This is ramp up time.
Adjust P1 until this time matches the time in table 2.
Rotating the adjustment potentiometer clockwise
will increase ramp time. To set the ramp down time,
hold the telescope function switch and watch the
time it takes the output to go from the maximum cur-
rent down to 0 current. This is the ramp down time.
Adjust P2 until this time matches the setting in table
2. Rotating the adjustment potentiometer clockwise
will increase the ramp time.
Figure 4-33. Control Card