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Chapter 7 – Prestart Inspection
If movement occurs the interlock is not functioning
properly. Do not operate the machine until the prob-
lem is corrected.
6. Test the operation of each control in both directions
from the upper controls.
7. The drive range switch and maximum travel speeds
are interlocked through limit switches on the main
boom that senses the position of the booms.
• When the main boom is raised above horizontal
or is extended, the machine should travel in low
speed only.
• To operate in high or medium speed the booms
must be stowed.
Emergency Stop
To test the emergency stop button from the upper
controls:
1. Start the engine from the upper controls.
2. Push the emergency stop button inward to turn off
electrical power.
3. Verify that the engine shuts off and the upper control
functions do not operate.
Emergency Power
To test the emergency power system from the upper
controls:
1. Turn the battery disconnect switch on.
2. At the lower controls, pull the emergency stop button
outward and place control selector switch in the upper
control position.
3. At the upper controls (refer to Figure 7.12), pull the
emergency stop button outward.
4. Hold the engine/emergency power switch in the
emergency power position and step on the platform
foot switch to verify operation of the aerial platform
using the emergency power system.
Horn Switch
Hold the horn switch (refer to Figure 7.12) upward to
ensure that it sounds to warn personnel in the area.
Snorkel Guard
To test the Snorkel Guard system:
1. Turn the battery disconnect switch on.
2. At the lower controls, pull the emergency stop button
outward and place the control selector switch in the
upper control position.
38
3. At the upper controls, pull the emergency stop button
outward (refer to Figure 7.12).
4. Step down on the platform foot switch.
5. Press down on the Snorkel Guard rail and verify that:
• the horn sounds.
• the blue light under the upper control panel
flashes.
• only main boom down and jib down functions
will operate.
6. Release the Snorkel Guard rail and the override
switch. Verify that all other machines function operate.
Electrical Power Outlet
Connect a source of 110 volt AC power to the power-input
connector on the right side of the chassis.
Some machines may have an electrical outlet at the
platform, but no power-input connector on the chassis. In
that case, power is supplied by an optional AC generator.
An external power source is not required.
With the engine running, place the AC generator switch
in the generator position to provide electrical power to the
electrical outlet at the platform and to the outlet on the
end of the generator housing.
Plug an electrical tool into the receptacle at the platform
and at the generator and try to operate the tool to verify
proper operation of the outlet.
The outlet is equipped with a ground fault circuit interrupter
(GFCI). Use the following procedure to test the GFCI.
1. Push the test button (refer to Figure 7.13).
Test Button
Figure 7.13 – Electrical Power Outlet
2. Plug an electrical tool into the outlet and verify the
power is off.
• If the power was off, push the reset button to
restore power.
Reset Button
460SJ – 1433685
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