Conduct a Bore - 128 JT40/JT40 All Terrain Operator’s Manual
Assemble Drill String
Connect Drill Pipe
4. Start drilling unit engine.
5. Align drill pipe in front wrench.
6. Clamp tool joint in front wrench. See “Clamp Pipe” on page 124.
7. Disconnect from pipe:
• Rotate spindle counterclockwise until threads on pipe segments are disengaged from each other.
Carriage will move backward as pipe rotates counterclockwise.
• Stop rotation and move carriage backward until it stops on the rear stop switch.
8. Load pipe:
• Ensure shuttle stop is positioned correctly.
• Open grippers or make sure they are open.
• Grippers open as pipe is lowered.
• Close grippers around pipe.
• Lubricate pipe threads at front wrench.
• Move pipe to spindle.
• Raise pipe lifters.
9. Connect pipe:
• Move carriage forward until spindle meets back end of pipe joint. Rotate spindle clockwise until pipe
begins to spin. Relax grippers slightly.
• Move carriage forward until pipe joints meet at front wrench.
• Rotate spindle clockwise. Carriage will move forward as pipe threads tighten.
• Rotate clockwise until spindle stops turning, and joint is fully tightened.
• Open grippers.
• Retract shuttles fully.
• Open front wrench.
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