JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 65)

SECTION 3 - CHASSIS & TURNTABLE
3120271 – JLG Lift – 3-27
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 WI LL 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. Turn ignition switch on. Do not start engine. Actuator
should kick toward max. fuel once, and then imme-
diately return to min. fuel. If not, see Troubleshoot-
ing.
2. 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.
3. 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).
4. Re-check voltage between terminal A & B as in step
2. Voltage reading should be between 13.5 - 14.6
VDC.
5. Carefully adjust Gain. You are looking for the best
compromise between quick response and good sta-
bility. Make very small adjustments, then load and
unload engine, or pull linkage back slightly and
release. Usually, a good set-up is one that makes 1
to 3 small bounces and then steadies down after a
large change. Too much Gain shows up as a rapid
(once per second) instability, most commonly at
light loads. Too little Gain shows up in large over-
shoots on start-up or large load changes, and gen-
erally sluggish operation.
6. Make final adjustment to the High Engine Pot.
7. Set machine controls to obtain the mid-engine
speed. Adjust the mid-engine pot as needed to
obtain the speed desired.
8. The start lockout adjustment is factory set. If neces-
sary, he starter lockout pot may be adjusted to
obtain dropout of the starter as the engine attains
running speed. Normally this is around 500 RPM.
9. The overspeed adjustment is factory set. If neces-
sary, it may be readjusted to shut off ignition power
at a different engine speed by means of the over-
speed adjustment pot. The overspeed is simply to
shut down an over revving engine.
NOTE: Overspeed to be set at 4000 - 4500 RPM’s. This is
not a function we test for correct settings. The High
Engine speed must be set before setting the over-
speed.
10. Re-install the back cover on the E-331. Final mount
the controller.