Daewoo Solar 340LC-V, Shop Manual

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S0902040
Page 5
Boom and Arm
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.
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.
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.
WARNING!
Secure the swing lock and tag and lock out controls in the operator’s cab to keep anyone from
moving or 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 2,700 kg (5,952 lb), not including the weight
of accessories or fixtures).
CAUTION!
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.