Broderson IC-280-A, Accompaniment To The Installation, Operation And Maintenance Manual

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REMOVAL OF AIR FROM HYDRAULIC CIRCUITS
To remove air from hydraulic circuits, perform the following steps:
1. Ensure all main shut-off valves on the reservoir are open.
2. Start the engine.
3. Raise and lower the boom minimum five times. Ensure that the cylinder travels full
stroke.
4. With the boom retracted and elevated to at least 65°, raise and lower the hook at least
once.
5. Extend and retract the boom minimum five times.
6. Swing the turret left one full revolution. Swing the turret right one full revolution.
7. Extend and retract each outrigger beam minimum five times. Extend and retract each
outrigger jack minimum five times. Outriggers can be operated in pairs.
8. With the crane on outriggers, steer the crane wheels fully left and right three times in
each steering mode.
9. B
roderson
uses multiple types of RCL computer
s
. If the RCL computer is connected to
the
topping cylinder by hose, it may be necessary to bleed this hose. Perform the following:
a. Raise the boom to approximately 5°.
b. Turn off engine.
W A R N I N G
The boom will lower during this procedure. Failure to keep the boom free
of obstructions could lead to destruction of property, injury, or death.
c. The boom will lower during this procedure. Ensure no personnel are in potential
pinch points, especially around the topping cylinder and between turret side
plates. Ensure that the boom is free of obstructions. Ensure that the hook will
not hit the ground and foul the hoist line.
d. Find the small hoses that connect to the piston sides of the cylinders, and follow
back to the RCL computer. Find the hoses that connect to the rod sides of the
cylinders, and follow back to the computer.
e. Loosen the piston-side fitting at the computer until the boom begins to lower. Al-
low the boom to lower 1-2°, or until no more air appears to be leaking out. Then
re-tighten the fitting. Use a bucket or other means to catch as much oil as possi-
ble. If little or no air is present in the line, the boom may not visibly lower before
the line is purged.
f. Loosen the rod-side fitting at the computer. The boom should not move.
g. Start the engine.
h. SLOWLY lower the boom until no more air is leaking out of the rod-side fitting.
Oil may come out of the fitting before the boom begins to move. Use a bucket or
other means to catch as much oil as possible.
i. Re-tighten the rod-side fitting.
j. Turn off the engine.
10. Check the level of oil in the hydraulic reservoir and add more, if necessary.
11. Set the crane on outriggers. With the boom about halfway extended and about 45° ele-
vated, lift a load near maximum capacity using the hoist. Raise the boom an additional
10-15°. Extend the boom. Check for “spongy” operation.
12. If necessary, cycle functions again to remove remaining air.