JLG 600SC_660SJC Operator Manual - Manual (Page 43)

SECTION 3 - USER RESPONSIBILITIES AND MACHINE CONTROL
3120897 – JLG Lift – 3-11
10. Function Speed.
The knob provides variable speed control of all
boom functions grouped together 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/Torque Select.
The machine has a three position switch.
The forward position gives maximum drive speed by
shifting the drive motors to minimum the displace-
ment and giving high engine when drive controller is
moved.
The back position gives maximum torque for rough
terrain, climbing grades, and sharp turns. In this
position, the motors are shifted t maximum displace-
ment and the engine in high speed when the drive
controller is moved.
The center position allows the machine to be driven
as quietly as possible by leaving the engine at mid
speed and the drive motors in maximum displace-
ment.
12. 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.
13. Drive Disabled Indicator.
When illuminated, the drive function has been dis-
abled. (Refer to Drive Function Operating Range
Diagrams in Section 2).
14. Platform Rotate.
The PLATFORM ROTATE control switch allows the
operator to rotate the basket to the left or right when
positioned to the desired direction.
15. Platform Leveling Override.
The PLATFORM LEVEL control switch allows the
operator to adjust the level of the platform by posi-
tioning 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. Variable lift speed is using the Function
Speed Control.
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.
20. Soft Touch Indicator. (If Equipped)
When illuminated (Yellow) the Soft Touch bumper is
against an object. All controls are cut out until the
override button is pushed, at which time controls are
active in the Creep mode.
21. AC Generator. (Green)
When illuminated (Green), the light indicates the
generator is in operation.