Snorkel TB47J - Manual (Page 26)

Chapter 6 – Controls
22 TB47J – 0075182
Note
On some machines it may be necessary to pause about
three seconds in the on position before going to start so
the starter can engage.
Turn the switch to off to turn the engine off and save fuel
if the platform is to stay in a particular position for a long
time.
Emergency Stop Button
The emergency stop is a two-position, red push button
on the top of the upper control panel (refer to Figure 6.6).
Push the button in to disconnect power to all control cir-
cuits at the upper controls. Pull the button out to restore
power.
Note
The lower controls override the upper controls. If the up-
per control emergency stop button is engaged the lower
controls can still be used to operate the aerial platform.
Push the emergency stop button in when the upper con-
trols are not in use to protect against unintentional op-
eration.
Speed Knob
Use the boom speed control knob (refer to Figure 6.6) to
control the speed of the following boom functions.
• Boom extend/retract
• Jib up/down
• Platform rotate clockwise/counterclockwise
Set the knob to slow when beginning a boom movement.
The speed may be increased by slowly rotating the knob
toward fast. For smooth operation, rotate the knob to
slow when ending boom movement.
Boom Joystick
The boom joystick (refer to Figure 6.6) is used to raise
and lower the main boom and to rotate the turntable. The
boom and turntable functions may be operated simulta-
neously.
Note
The distance the joystick is moved is proportional to the
speed of the function.
Hold the joystick forward to raise the main boom and
backward to lower the boom.
Hold the joystick to the right to rotate the turntable coun-
terclockwise and to the left to rotate the turntable clock-
wise.
Drive Joystick
The drive joystick (refer to Figure 6.6) is used to control
forward and reverse motion of the aerial platform. It is
also used to steer the machine. The steering and drive
functions may be operated simultaneously.
Note
The distance the joystick is moved is proportional to the
speed of the function.
Hold the joystick forward to move the aerial platform for-
ward and backward to move in reverse as indicated by
the directional arrows on the chassis.
Hold the joystick to the right to steer the aerial platform
to the right and to the left to steer to the left as indicated
by the directional arrows on the chassis.
Note
The steering wheels are not self-centering. Set the steer-
ing wheels straight ahead after completing a turn.
Drive Range Switch
The drive range switch (refer to Figure 6.6) has two posi-
tions to select drive wheel operation:
• HI – high speed and low torque operation.
• LO – low speed and high torque operation.
Jib Articulation Switch
The jib switch (refer to Figure 6.6) is used to raise or
lower the jib. The switch is spring returned to the center
off position.
Hold the switch up to raise the jib. Hold the switch down
to lower the jib.
Note
The jib and platform rotate functions can not be oper-
ated at the same time. The platform rotate function will
override the jib function.
Boom Extend/Retract Switch
The boom extend/retract switch (refer to Figure 6.6) is
used to extend or retract the tip and intermediate booms.
The switch is spring returned to the center off position.
Hold the switch down to extend the booms. Hold the
switch up to retract the booms.
Platform Rotate Switch
The platform rotate switch (refer to Figure 6.6) is used to
rotate the platform relative to the end of the tip boom. The
switch is spring returned to the center off position.
Hold the switch to the left to rotate the platform clock-
wise. Hold the switch to the right to rotate the platform
counterclockwise.
Platform Level Switch
The platform level switch (refer to Figure 6.6) is used to
level the platform floor with respect to the ground. The
switch is spring returned to the center off position.
Hold the switch up to tilt the platform floor upward or
away from the ground. Hold the switch down to tilt the
platform floor downward or toward the ground.