Snorkel TB126J CE - Manual (Page 49)

Chapter 8 – Operation
TB126J – 0192117EE 45
Use the following procedure to operate the drive and
steer functions.
1. Determine the desired drive range for the specific
driving conditions.
Use high range when traveling across firm, flat,
level surfaces. High range can only be activated
when the booms are stowed. High range is for
high speed, low torque operation.
Use low range for driving on loading ramps or oth-
er steep grades and when safety considerations
demand slow deliberate machine movement. Low
range is for low speed, high torque operation.
2. Place the drive/boom selector switch in the drive
position.
3. Step down on the platform foot switch.
4. Push the drive joystick forward to move the chas-
sis forward, the direction of the blue arrow. Pull the
joystick backward to move the chassis backward,
the direction of the yellow arrow. The drive speed
is proportional to the joystick position.
5. To stop drive motion, return the joystick to neutral.
6. Push the drive joystick to the right to steer to the
right, the direction of the yellow arrow. Push the
joystick to the left to steer to the left, the direction
of the blue arrow.
Note
The steering wheels are not self-centering. The machine
must be driving to steer the wheels and must be driving
fast enough to release the brakes for steering to work.
Set the steering wheels straight ahead after complet-
ing a turn.
7. After driving to the desired location, release the foot
switch, or push the emergency stop button to apply
the parking brakes.
Drive Speeds
The drive speed is proportional to the joystick position.
The farther the joystick is moved, the faster the travel
speed.
Always slow down and shift the drive system to low
range before traveling over rough terrain or any sloped
surface.
Drive speed ranges are interlocked through a limit switch
that senses the main boom position. When the boom
is elevated up to midway, only the low drive speed will
work. When the boom is elevated to midway or above,
only the creep drive speed will work.
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
A Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Do not alter,
disable, or override any safety device.
Do not use the aerial platform if it drives faster than 1.2
km/h (0.75 mile per hour) [10 m (33 feet) in 30 seconds]
when the booms are elevated up to mid elevation.
Above mid-elevation, the maximum speed should be
0.06 m/sec (creep).
Motion Warning Alarm
The optional motion warning alarm sounds loud intermit-
tent beeps when the drive joystick is in the forward or
reverse position.
Platform Overload Sensing System
All functions are stopped from the upper and lower
controls, when the platform overload limit is exceeded.
The horn will sound intermittently and the red overload
light (refer to Figure 8.7) will blink until the excess load
is removed from the platform. At that time, the machine
functions are again operational.
Figure 8.7 – Upper Controls
If the platform becomes significantly overloaded, or if
an upward force on the platform exceeds approximately
445 N (100 lb), the system will enter into error mode,
stopping all functions from the upper and lower controls.
The horn will then sound constantly and the overload
light will stay illuminated at the upper and lower controls
(refer to Figures 8.7 and 8.8).
Platform
Overload Light