Maintenance of rotary drilling rig (3)
Fault phenomenon
Kelly bar slips down sometimes when it is unloading
the soil.
Problem analysis
1.The oil seal of break cylinder has been broken.
2.It caused by the insufficient oil-addition of the
main winch.
Handling method
1. Change
2.Connect the oil-addition pipe.
Discriminated method
Open the reducer to add gear oil plug and gear oil is
too watery.
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