Doosan DX60R Shop Manual page 885

Park the excavator away from obstructions and all traffic on
clear, flat, level ground. Extend the arm cylinder and crowd the
arm into the boom. Partially retract the boom cylinder so that the
boom is stretched out in front of the excavator, as low to the
ground as possible, with the arm crowded under the boom.
The tip of the arm point should be lowered to secure blocking
that will safely support the weight of the arm. Place the blocking
directly in front of the excavator and make sure that it will not be
unbalanced with an initial weight load that is all to one end,
under the arm point.
Shut off the engine and release hydraulic system pressure -
move any of the control levers with the engine off to release
pressure built up in the accumulator. Manually vent residual
hydraulic pressure in the tank by moving the lever near the cap,
on top of the reservoir.
Secure the swing lock and tag and lock out controls in the
operator's cabin to
inadvertently starting the engine. Restrict access to the
work site while sections of the attachment are in the air, or
while they are being supported by the assist crane. The safe
lifting capacity of the assist crane or hoist that is used must
exceed the weight of the heaviest section of the attachment,
the boom (approximately 756 kg [1,667 lb], not including the
weight of accessories or fixtures).
Before beginning the disassembly of attachment mounting
pins, disconnect the arm cylinder hydraulic hose couplings and
put a clean plug in the end of each one. Use any and all
reasonable precautions necessary to avoid introducing dirt or
other contaminants into the hydraulic system. Wipe down
coupling points before disconnecting hydraulic lines and use
evaporative type solvent spray cleaner. Tag and mark hoses for
reassembly, if necessary.
Place a sling under the arm cylinder (the cylinder used to
extend and retract the attachment arm, pinned to the top of the
boom). Lift the sling so that the weight load on the rod end of
the arm cylinder (pinned to the ears on the inner end of the arm)
is released. Prepare blocking under the arm that will securely
support the weight of the arm and arm cylinder.
Boom and Arm
WARNING
keep anyone from moving or
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