Maintenance of rotary drilling rig (2)

Maintenance of rotary drilling rig (2)

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Fault phenomenon

In the procedure of normal operation to lay down the kelly bar, appearing with the phenomenon of its suddenly drops（2）<Part 1 plz read the maintenance of rotary drilling rig (1)>.

Problem analysis

1. The position of the oil-addition pipes is not ideal.

2. The magnetic valve is blocked.

Problem analysis

1. It's the best to connect the oil-addition pipe with the motor's S rim, but not the BVD break valve.

2. Clean or change the valve element

Handling method

1. Visual inspection;

2. Pull up the plug and move the magnetic valve by hand