Platform Or Boom Caught Overhead; Auxiliary Descent System - JLG H340AJ Operation And Safety Manual

SECTION 5 - EMERGENCY PROCEDURES

Platform or Boom Caught Overhead

If the platform or boom becomes jammed or snagged in over-
head structures or equipment, do the following:
1. Shut off the machine.
2. Rescue all people in the platform before freeing the
machine. Personnel must be out of the platform before
operating any controls on the machine.
3. Use cranes, forklifts, or other equipment to stabilize motion
of the machine to prevent a tip over as required.
4. From the ground controls, use the Auxiliary Power System (if
equipped) to carefully free the platform or boom from the
object.
5. Once clear, restart the machine and return the platform to a
safe position.
6. Inspect the machine for damage. If the machine is damaged
or does not operate properly, turn off the machine immedi-
ately. Report the problem to the proper maintenance per-
sonnel. Do not operate the machine until it is declared safe
for operation.
5-2
5.4

AUXILIARY DESCENT SYSTEM

Refer to Figure 5-1., Auxiliary Descent Decal and Hand Pump.
The auxiliary descent system allows the boom and jib to be low-
ered in the event of primary power (engine power) loss. This sys-
tem uses electrically powered solenoid valves and the force of
gravity to lower the booms and jib. The following functions are
included in this system and will operate normally if the engine is
not running and the auxiliary power switch has been activated.
• Main Lift Down
• Tower Lift Down
• Jib Lift Down
1. From the ground control console, place the Platform/
Ground Select switch in the Ground position.
2. Pull out the Power/Emergency Stop control.
3. Hold down the Auxiliary Descent Enable Switch and the con-
trol switch for the desired function.
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