Operating Controls; Envelope Restriction; Emergency Stop; Emergency Power - Snorkel TB42J Operato's Manual

Emergency
Stop Switch
Emergency
Power Switch
Figure 7.12 – Lower Controls

Operating Controls

Use the following procedure to operate the machine from
the lower controls.
1. Turn the battery disconnect switch on.
2. At the lower controls, lift the emergency stop safety
guard up, and push the toggle switch up to the on
position.
3. Insert the key into the master switch and turn the
switch to start until the engine starts, then release.
4. Let the engine warm to operating temperature.
5. Hold the ground controls switch upward.
A
Danger
Pinch points may exist between moving compo-
nents. Death or serious injury can result from be-
coming trapped between components, buildings,
structures, or other obstacles. Make sure all person-
nel stand clear of the aerial platform while perform-
ing the prestart inspection.
6. Test the operation of each function in both directions.
Note
When checking the turntable rotation function in the
clockwise direction, the turntable will rotate toward you.

Envelope Restriction

Raise the main boom so it is horizontal and then extend
the tip boom until it stops and will no longer extend.
The black and yellow caution tape on the right side of the
tip boom should be within 2" (5 cm) of being flush with
the end of the base boom. The envelope restriction light
on the upper control panel should also be on.
If the tip boom does not stop extending with the caution
tape within the tolerance mentioned above, take the ma-
chine out of service and have it repaired by qualified main-
tenance personnel before putting it back into service.
TB42J – 0172310
Control Selector
Switch
Master Start
Switch
Ground Control
Switch
Chapter 7 – Prestart Inspection

Emergency Stop

Push the emergency stop safety guard down to turn off
the engine. The lower control functions should not oper-
ate with the emergency stop in this position.

Emergency Power

Place the battery disconnect switch, the emergency stop
switch, and the master switch in the on position.
Hold the engine/emergency power switch in the emer-
gency power position and the ground controls switch
upward to operate the aerial platform from the lower con-
trols using the emergency power system.

Emergency Lowering

The main boom can be lowered in an emergency using
the emergency lowering knob. The emergency lowering
knob is at the base of the main boom lift cylinder.
Use the following procedure to test the emergency lower-
ing system.
1. Use the lower controls to raise the main boom until
the emergency lower knob is visible in the access
hole as shown in Figure 7.13.
Figure 7.13 – Emergency Lowering Knob
2. Turn the engine off.
A
Danger
Pinch points may exist between moving compo-
nents. Death or serious injury can result from be-
coming trapped between components. Stand clear
of moving components while test operating the
machine.
3. Slowly turn the knob to open the bleed down valve.
The boom should slowly lower by gravity.
Emergency
Lowering Knob
29