Boom Removal Procedure - Doosan DX140R Shop Manual

To make sure that the polished surfaces of cylinder rod
ends will not suffer accidental damage during disassembly
or removal procedures, wrap exposed rod surfaces
(especially those of boom cylinders) with a protective
covering material. Immediately following disassembly and
removal, cylinder rods should always be fully retracted.
This eases handling problems and also avoids possible
damage.
Remove retainers on the end of the mounting pin for the arm
cylinder rod end. Use the assist crane to relieve the weight load
and withdraw the pin. Lower the arm down to the blocking
support for any continued disassembly procedures.

Boom Removal Procedure

NOTE:
Boom removal may be simplified if the shell of the
operator's cabin is taken off the turntable deck first.
Refer to the Operator's Cabin Removal procedure
before continuing, if both components are to be
removed from the excavator.
After the bucket, arm and arm cylinder have been removed,
lower the end of the boom to a stable, secure blocking support.
Attach the assist crane sling to the body of either boom cylinder,
break the mounting pin connection to the boom by tapping
through the pin from the same side of the boom and repeat for
the opposite cylinder.
Release hydraulic pressure and disconnect line couplings as
previously outlined in the Arm Removal Procedure, observing
the same precautions.
Disconnect wiring for work light assemblies and any other
accessory lines or connections. Locate the sling of the assist
crane near the center of gravity, optimum lift point for the boom,
and use the crane to take pressure off the boom foot pin. Drive
out the pin after disassembling retainers and carefully lift away
the boom.
Traveling the excavator,
movement over bumps or sloping, uneven surfaces could
all produce loss of control and possible accidents or
injuries, if the turntable deck has been unbalanced by
removal of weight from one end only.
To maintain stability, the counterweight should be removed
whenever the front attachment is taken off the machine.
Boom and Arm
Page 10
CAUTION
WARNING
swinging the turntable or
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