IHI 55N3, Operation Manual, Page: 69 / 115

2 – 27
ᵐ
O PE R ATI O N
2-15 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
Boom raise relief valve