JLG 450AJ ANSI Operator Manual - Manual (Page 41)

SECTION 3 - USER RESPONSIBILITIES AND MACHINE CONTROL
3120748 – JLG Lift – 3-11
DO NOT OPERATE MACHINE IF DRIVE SPEED/TORQUE SELECT
OR FUNCTION SPEED SWITCHES OPERATE WHEN BOOM IS
ABOVE HORIZONTAL.
10. Function Speed.
The knob provides variable speed control of all
boom functions grouped to the right of the knob. For
smoothest operation of these functions, use two
hands: rotate the knob counterclockwise to the
slowest position, select the function switch, and
while holding the switch on, rotate the knob to the
desired speed. To achieve a smooth stop, rotate the
knob ccw to a slow speed prior to letting go of the
function switch.
Rotating the knob fully counterclockwise until a click
is heard puts all controls, including drive, main lift,
and swing into creep speed. This slow speed is
used for fine positioning of the platform when close
to obstacles. A snail symbol is used to indicate
"creep" speed and is shown at the Function Speed
knob as well as near the proportional controllers to
act as a reminder.
11. Drive Speed Switch (4WD Equipped Machines).
On machines equipped with 4WD, the drive speed
switch also selects 2WD or 4WD modes. The for-
ward position produces maximum speed by operat-
ing in 2WD at high engine rpm. The center position
selects 4WD at mid engine rpm. The backward posi-
tion selects 4WD at high engine rpm.
12. Drive Speed Switch (2WD Equipped Machines).
The forward position produces maximum speed by
operating at high engine rpm. The backward posi-
tion selects mid engine rpm.
13. Creep Speed Indicator.
Illuminated (Green) when the Function Speed Con-
trol is turned to the creep position, the indicator acts
as a reminder that all functions are set to the slowest
speed.
14. Platform Rotate.
The Platform Rotate control switch allows the opera-
tor to rotate the basket to the left or right when posi-
tioned to the desired direction.
15. Platform Leveling Override.
The Platform Level control switch allows the opera-
tor to adjust the level of the platform by positioning
the switch to UP or DOWN.
16. Articulating Jib Boom. (If Equipped)
Push level, toggle switch forward to lift up, pull back
to lift down.
17. Fuel Select (Dual Fuel Engine Only). (If Equipped)
Gasoline or liquid propane fuel may be selected by
moving the switch to the appropriate position. It is
unnecessary to purge the fuel system before switch-
ing fuels, so there is no waiting period when switch-
ing fuels while the engine is running.
18. Lights. (If Equipped)
This switch operates control console panel lights
and head lights if the machine is so equipped. The
ignition switch does not have to be on to operate the
lights, so care must be taken to avoid draining the
battery if left unattended. The master switch and / or
the ignition switch at the ground control will turn off
power to all lights.
19. Engine Distress Indicator Light (Yellow).
The light turns on and an alarm sounds when
machine’s power system requires immediate ser-
vice. Any of the following conditions will turn on light
and alarm: low engine oil pressure, high engine
coolant temperature, clogged engine air filter, low
alternator output, clogged hydraulic oil return filter,
or clogged charge pump filter.
Updated 4-24-02