Snorkel TB50 - Manual (Page 32)

Chapter 6 – Controls
28 TB42/TB50 – 0074923
• High range – high speed and low torque operation.
• Low range – low speed and high torque operation.
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
simultaneously.
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
counterclockwise and to the left to rotate the turn-
table clockwise.
Boom Extension Switch
The boom extension 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 backward to extend the booms.
Hold the switch forward to retract the booms.
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 forward to tilt the platform floor up-
ward or away from the ground.
Hold the switch backward to tilt the platform floor
downward or toward the ground.
Platform Rotation Switch
The platform rotation 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
clockwise.
Hold the switch to the right to rotate the platform
counterclockwise.
Boom 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
• Boom raise/lower
• Platform rotate
• Platform level up/down
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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.
Throttle Switch
The throttle switch (refer to Figure 6.6) is used to set the
engine throttle speed to either low or high idle.
Place the switch in the low position for normal ma-
chine operation.
Place the switch in the high position to drive at
maximum speed.
The engine may have two or three speed throttle op-
eration.
On machines with a two speed throttle:
With the throttle switch in the low position, the engine
will operate at low speed only. Operation will be
quieter and the engine will consume less fuel than
at high throttle operation.
High engine speed is obtained when the main boom
is horizontal, the foot switch is depressed, the throttle
switch is in the high position, and the drive joystick
is moved out of neutral into the forward or reverse
position.
On machines with three speed throttle:
Press down on the platform foot switch to increase
the engine speed from low to mid-range, indepen-
dent of the throttle switch.
High engine speed is obtained when the main boom
is horizontal, the foot switch is depressed, the throttle
switch is in the high position, and the drive joystick
is moved out of neutral into the forward or reverse
position.
Place the throttle switch place in the low position to
drive the machine in mid-range engine speed.
Engine/Emergency Power Switch
The engine/emergency power switch (refer to Figure 6.6)
is used to operate turntable, boom, and platform func-
tions using the emergency power system. The switch is
spring returned to the engine position for aerial platform
engine operation.
Caution
The emergency power system is for emergency
lowering and stowing only. The length of time the
pump can be operated depends on the capacity
of the battery. Do not use this system for normal
operation.
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