JLG M450 Operator Manual - Manual (Page 88)

SECTION 5 - EMERGENCY PROCEDURES
5-2 – JLG Lift – 3121210
Platform or Boom Caught Overhead
If the platform or boom becomes jammed or snagged in
overhead structures or equipment, rescue platform occu-
pants prior to freeing the machine.
5.4 EMERGENCY TOWING PROCEDURES
Towing this machine is prohibited, unless properly equipped.
However, provisions for moving the machine, in case of a
malfunction or power failure, have been incorporated. The
following procedures are to be used ONLY for emergency
movement to a suitable maintenance area.
1. Chock wheels securely.
2. Disengage drive hubs by reversing disconnect caps.
3. Connect suitable equipment, remove chocks, and move
machine.
After moving machine, complete the following procedures:
1. Position machine on a firm and level surface.
2. Chock wheels securely.
3. Engage drive hubs by reversing disconnect caps on
hubs.
4. Remove chocks from wheels as needed.
5.5 MANUAL DESCENT SYSTEM
The manual descent system is used, in the event of total power
failure, to lower the upper and lower booms using gravity. To
operate the manual descent system, proceed as follows:
Machines prior to S/N 0300062850 and from S/N
0300127572 to Present:
1. Locate manual descent knob on main valve and turn
CW (clockwise). Install handle into manual descent
pump and lower the Mid and Lower Booms by pumping
the handle until they are completely lowered.
2. Turn manual descent knob CCW (counterclockwise) and
lower the Upper (or main) Boom by pumping the handle
until it is completely lowered. Return manual descent
knob to center position and stow handle in bracket pro-
vided.
S/N 0300062850 to S/N 0300127572:
1. Locate manual descent knob on main valve and turn
CCW (counterclockwise). Install handle into manual
descent pump and lower the Mid and Lower Booms by
pumping the handle until they are completely lowered.
2. Turn manual descent knob CW (clockwise) and lower
the Upper (or main) Boom by pumping the handle until it