JLG 800A_AJ ANSI Service Manual - Manual (Page 165)

SECTION 3 - CHASSIS & TURNTABLE
3120740 – JLG Lift – 3-109
Gain:
This adjustment is made by turning the plastic screw
clockwise (CW to increase governor sensitivity, counter-
clockwise (CCW) to decrease sensitivity. The adjustment
range of the Factory pot is about 3/4 of a turn, AND OVER-
TURNING WILL BREAK THE INTERNAL STOPS, making
further adjustments impossible. Too much gain will cause
instability and the engine will pulsate, Not enough gain will
make the engine slow to respond to load requirements,
and at first appears to be a good setting when operating
directional functions other than drive. The engine will
accelerate right up to the set RPMS and stop at that
point.The problem with this type of gain setting is that
when a large load is applied (usually thru drive) and then
suddenly unloaded, the engine will be slow to respond in
decreasing RPMS. This will cause the engine to over rev
and then at times, will activate the over speed cutout and
shut the engine off. The ideal gain setting will provide a
compromise between quick response and good stability.
This will usually show up as 1 to 3 engine pulsation’s
before leveling out at the set RPMS when going from idle
to high engine.
Mid engine:
This adjustment is made by turning the 1/8" brass screw
clockwise (CW) to increase speed, and counterclockwise
(CCW) to decrease speed. The adjustment range of the
Mid engine pot is about 25 turns, each turn will change
engine speed by about 100 to 200 RPMS. THE pot is pro-
tected by an slip clutch at each end and will not be
harmed by moderate over adjustment. However, the gov-
ernor will not function when the pot is past full travel. If you
suspect that you have over adjusted the Mid engine pot,
or have lost track of where you are, turn the pot 25 turns
out (CCW), then turn in (CW), 15 turns. This will get you
back into the range you should be in. Make all adjust-
ments before setting the mid engine.
Start lockout:
This adjustment is made by turning the 1/8" brass screw
clockwise (CW) to increase speed and counterclockwise
(CCW) to decrease speed. The adjustment range of the
Start lockout pot is about 25 turns, each turn will change
engine speed by about 100 to 200 RPMS. This pot is pro-
tected by a slip clutch at each end and will not be harmed
by moderate over-adjustment. However, the governor will
not function when the pot is past full travel. If you suspect
that you may have over-adjusted the Start lockout pot, or
have lost track of where you are, turn the pot to 25 to 30
turns in (CW), Then turn out (CCW) 8 1/2 turns. This will
get you back into the range you should be in. Start lock-
out should normally not have to be adjusted. Normally
startout should occur at around 500 RPM. If while crank-
ing the engine seems to stop momentarily then reengages
the starter, turn the adjustment in (CW) 1/4 to 1/2 turn at a
time until the engine will crank with out locking out start. If
the starter engages while the engine is running, check the
idle RPMS before adjusting the governor. On the 800
series, this should be 1000 RPMS. Do not set the RPMS
above 1100 RPMS as this will cause engine shut down
problems that will be similar to dieseling.
Over speed:
This adjustment is made by turning the 1/8" brass screw
clockwise (CW) to increase speed, and counterclockwise
(CCW) to decrease speed. The adjustment range of the
Over speed pot is about 25 turns, each turn will change
engine speed about 100 to 200 RPMS. This pot is pro-
tected by a slip clutch at each end and will not be harmed
by moderate over-adjustment. However the governor will
not function when the pot is past full travel. If you suspect
that you have over-adjusted the Over speed pot, or have
lost track of where you are, turn the pot 25 turns in (CW),
then turn out (CCW) 5 1/2 turns. This will get you back into
the range you should be in. Over speed should normally
not have to be adjusted. When adjusting Over speed
make sure other adjustments have been made correct.
Factory:
This adjustment is made by turning the plastic screw
clockwise (CW) to increase governor sensitivity, counter-
clockwise (CCW) to decrease sensitivity. The adjustment
range of the Factory range of the pot is about 3/4 of a turn,
AND OVERTURNING WILL BREAK THE INTERNAL
STOPS, making further adjustments impossible. The Fac-
tory setting normally will not have to be adjusted.
NOTE: These settings are factory set, Start Lockout, Fac-
tory Adjust and Overspeed. They are conformally
coated by P.G. and should not need to be reset.
Assuming that the Actuator and Controller are mounted,
the wiring is run and checked, and that the linkage is
properly installed, proceed as follows:
1. Use multimeter to check battery voltage at battery
terminals, and record. Now check voltage at the
machine connection points for terminals A & B of the
8 pin connector on the E-331 (A is +, B is -). Voltage
reading should be the same as at battery. If not, shut
down, and correct wiring.
2. Hold the linkage back by hand, so as to control
engine speed manually. Start engine, set vehicle
controls to obtain High Engine speed, gradually
release the linkage, and adjust the speed-set as
needed to set the speed as desired. If engine speed
surges, reduce Gain a little, as required (CCW).
3. Re-check voltage between terminal A & B as in step
2. Voltage reading should be between 13.5 - 14.6
VDC.