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REMOVAL OF AIR FROM HYDRAULIC CIRCUITS
To remove air from hydraulic circuits, perform the following steps:
1. Start the engine.
2. Raise and lower the boom, minimum five times. Ensure that the cylinder travels full
stroke.
3. With the boom retracted and elevated to at least 65°, raise and lower the hook at least
once with the hoist.
4. Extend and retract the boom, minimum five times.
5. Swing the turret left, one full revolution. Swing the turret right, one full revolution.
6. Extend and retract each outrigger a minimum of five times.
7. With the crane on outriggers, steer the crane wheels fully left and right three times in
each steering mode.
8. Check the level of oil in the hydraulic reservoir and add more if necessary.
9. 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.
10. If necessary, cycle functions again to remove remaining air.
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