JLG X600AJ Operator Manual User Manual
Page 94
SECTION 5 - EMERGENCY PROCEDURES
5-6
– JLG Lift –
3121637
Manual Descent with Engine Running but without
Electrical Power
(Combustion Engines Only)
ENSURE BOOM IS NOT POSITIONED OVER THE OUTRIGGERS OR OVER-
HEAD OF PERSONNEL BEFORE LOWERING.
1. Operate the boom control valves at the ground
control valve distributor. (see Figure 5-2.)
2. Ensure the machine is level and all outriggers are
properly deployed on a firm surface. If outrigger
movement is required first, See “Outrigger/Track
Movement Emergency Procedure:” on page 5-9.
NOTE:
The distributor enable valve (item 12) adjusts the
speed of the boom movements (pressure flow) when
using the boom control valves at the valve distributor
on the left side of the machine in Figure 5-2. Without
electrical power you must manually open this valve by
pressing it in before operating the boom controls.
3. Always carry out movement at the slowest possi-
ble speed.
4. Make boom movements in the following
sequence:
• fully lower jib
• fully lower tower boom
• fully lower main boom
5. When emergency operation is complete, release
the proportional valve to the closed position.
6. At the engine, turn the key to the off position.