FROM GROUND

AUXILIARY DESCENT SYSTEM
The auxiliary descent system allows the boom and jib to be lowered in the event of
primary power (engine power) loss. This system 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 control switch for the
   desired function.

If it is necessary to raise the jib in order to properly perform the auxiliary descent
procedure use the following procedure.

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, hold up the jib lift control
   switch and operate the hand pump located next to the hydraulic tank to raise
   the jib