Snorkel SB47JRT - Manual (Page 35)

Chapter 7 – Prestart Inspection
SB47JRT – 0075522 29
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, pull the emergency stop but-
ton outward. Insert the key in the control selector
switch and turn the switch to the lower control posi-
tion.
3. Press the start button until the engine starts, then
release.
4. Let the engine warm to operating temperature.
5. Hold the ground operation switch upward.
A
Danger
Pinch points may exist between moving compo-
nents. Death or serious injury will 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.
Emergency Stop
Push the emergency stop button in to turn off the engine.
The lower control functions should not operate with the
emergency stop in this position.
Emergency Power
Place the battery disconnect switch, the emergency stop
button, and the master switch in the on position.
Hold the engine/emergency power switch in the emer-
gency power position and the ground operation switch in
the on position to operate the aerial platform from the
lower controls 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 (refer to
Figure 7.11).
Use the following procedure to test the emergency lower-
ing system.
1. Use the lower controls to raise the main boom.
Figure 7.11 – Emergency Lowering Knob
2. Turn the engine off.
A
Danger
Pinch points may exist between moving compo-
nents. Death or serious injury will result from be-
coming trapped between components. Stand clear
of moving components while test operating the ma-
chine.
3. Slowly turn the knob to open the bleed down valve.
The boom should slowly lower by gravity.
A
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Fully close
the emergency lowering knob before operating the
aerial platform.
4. Turn the knob to close the cylinder bleed down valve.
Level Sensor
Use the following procedure to test the level sensor.
1. Position the aerial platform on a smooth, flat, level
surface.
2. Remove all persons and materials from the platform.
3. Start the engine and raise the main boom to just
above horizontal.
4. Open the rear door on the left side of the machine to
access the level sensor (refer to Figure 7.12).
Emergency
Lowering Knob