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OPERATION
2-16 BOOM LOWERING WITH THE ENGINE STOPPED
Method of Boom Lowering When Engine
Damaged.
Be sure no one is under or the front implements
before manually lowering the boom.
Keep all personnel away from the boom area
when lowering the boom with engine stopped.
Use the following procedure when it is necessary to
lower the boom while engine is shut down or the
hydraulic system disabled.
1. Remove the floor cover under the operator’s
station floor.
2. Remove the lock nut
d
of the boom raise relief
valve located inside the control valve
c
.
3. Slowly loosen adjusting screw
e
until boom start
lower. The boom will start to lower slowly.
4. After making sure that the front implement has
lowered completely on to the ground, install the
lock nut
d
.
5. Make any necessary repairs placing the excavator
back into service.
NOTE
: For further information, contact your IHI
dealer.
WARNING
c
(rear)
(front)
Boom raise relief valve
C
o
ntr
o
l
va
l
v
e
