JLG 660SJ Operator Manual - Manual (Page 104)

SECTION 5 - EMERGENCY PROCEDURES
5-2 – JLG Lift – 3121205
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 have been
incorporated. For specific procedures, refer to Section 4.
5.5 MANUAL DESCENT (MACHINES PRIOR TO S/N
70975)
The manual descent valves are used, in the event of total
power failure, to retract and lower the boom using gravity.
The manual descent valves are located on the right side of
the turntable (in tank compartment). Look for the instruction
decal located on the right side of turntable below control
valve. The procedures are as follows:
1. To lower and retract the boom: Close knob #1 (clock-
wise), open knob #2 (counterclockwise). Observe the
boom powertrack to see if the boom is lowering and
retracting. When the boom is completely retracted, go to
STEP #2. (If no movement is observed, go to step #2).
2. To lower boom: Open knob #1 (counterclockwise),
knob #2 must remain open.