JLG M400 Operator Manual - Manual (Page 82)

SECTION 5 - EMERGENCY PROCEDURES
5-2 – JLG Lift – 3121644
Platform or Boom Caught Overhead
If the platform or boom becomes jammed or snagged in over-
head structures or equipment, rescue platform occupants 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 mal-
function 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 fail-
ure, to lower the upper and lower booms using gravity. To operate
the manual descent system, proceed as follows:
1. Locate manual descent knob on main valve and turn clock-
wise. 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 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 provided.
5.6 MANUAL SWING OVERRIDE
The manual swing override is used to manually swing boom and
turntable assembly in the event of a total power failure when the
platform is positioned over a structure or obstacle. To operate the
manual swing override, proceed as follows:
1. Using a 7/8 inch socket and ratchet wrench, locate nut on
swing worm gear on left side of machine.
2. Install wrench on nut and ratchet in the direction desired.