DX380LC-7
Operation
3-66
Equipment Lowering with Engine Stopped
To lower the boom, place the safety lever in the "UNLOCKED"
position and turn starter switch to "I" (ON) position. Move the
joystick to "BOOM LOWER" position. If the accumulator is still
charged, the boom will lower. Turn key to "O" (OFF) position and
remove from starter switch.
If the boom does not lower, the accumulator is empty. Use one
of the following methods to lower the boom.
Machine without a Boom Lock Valve
When you must manually lower the boom if the engine has
stopped and cannot be started, use the following procedure:
1.
Relieve the pressure in the hydraulic system before
manually lowering the boom.
A.
Turn starter switch to "I" (ON) position.
B.
Move the safety lever to "UNLOCKED" position.
C.
Move the joysticks and travel levers/pedals forward
and backward to relieve accumulator pressure.
D.
Turn key to "O" (OFF) position and remove from
starter switch.
2.
Allow hydraulic oil to cool. Tip breather cap up (1, Figure
120) on the top of the hydraulic tank until internal pressure
in the hydraulic tank has been completely relieved.
WARNING
AVOID DEATH OR SERIOUS INJURY
Boom weight can cause cylinder oil pressure to reach relief
pressure of the boom lowering control device when the
boom is supported by one cylinder. Boom can lower
suddenly, causing death or serious injury.
To avoid death or serious injury, be sure no one is under or
near the work tool before manually lowering the boom.
Keep all personnel and bystanders away from the boom
area when lowering the boom with the engine stopped.
DS1901504
1
Figure 120
