Ditch Witch JT922 - Manual (Page 90)

JT922 Operator’s Manual
Conduct a Bore - 89
Remove Pipe
CMW
Remove Pipe
1. Stop carriage when pipes are aligned in wrenches.
2. Clamp pipe in front wrench. See page 79.
3. Clamp and rotate rear wrench to break front joint. See “Wrench control” on page 25.
4. Disengage rear wrench.
5. Unscrew front joint.
• Slowly rotate spindle counterclockwise to unscrew pipe. Move carriage back slowly until threads
unscrew.
• Move carriage back until pipe is properly positioned in rear wrench.
6. Break rear joint.
• Engage rear wrench.
• Slowly rotate spindle counterclockwise until joint is loosened. Do not fully unscrew joint.
• Disengage rear wrench.
• Move carriage back, move seat toward pipe and grip pipe with both hands.
• Pull pin end of pipe clear of saver sub, lift pipe and stow it in box.
7. Lube front threads.
8. Attach saver sub to next pipe.
• Move carriage forward until saver sub touches pipe.
• Rotate spindle to screw onto pipe. Slowly tighten joint to full machine torque.
9. Disengage front wrench to release pipe.
NOTICE: If engine is shut off during backreaming, drill pipe clamped by wrenches but not connected to
saver sub can be pulled downhole as vise wrenches loosen.