Ditch Witch JT100AT - Manual (Page 131)

Conduct a Bore - 130
JT100/JT100 All Terrain Operator’s Manual
Remove Pipe
CMW
©
Begin Backream
1. After backream assembly is attached to pipe, tracker operator should:
• leave pit and stand away from the exposed drill string.
• if using tracker control, turn on tracker to enable drilling unit thrust/pullback and rotation.
• if not using tracker control, communicate to drill operator that backream string is clear.
2. Turn on drill fluid and pressurize drill pipe. Verify that jets are open.
3. Without rotating, slowly pull back until reamer contacts bore hole opening. Do not lodge reamer in
hole.
4. Begin slow rotation and pullback.
5. Increase drilling fluid flow and rotation as the backream string enters the ground.
6. If tracking backream, tracker operator may continue tracking when the backream string is no longer
visible.
Remove Pipe
1. Enable automated pipeloader system (automated pipeloader control only). See page 121.
2. Stop carriage when pipes are aligned in wrenches.
3. Clamp pipe in front wrench. See page 116.
4. Clamp and rotate rear wrench to break front joint. See “Rear wrench clamp switch” on page 36 and
“Rear wrench rotation switch” on page 36.
5. Disengage rear wrench.
6. Grip 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.
Manual Pipeloader Controls Automated Pipeloader Control
• Open grippers.
• Lift pipe off shuttles.
• Extend shuttles to spindle position.
• Close grippers.
• Lower lifters.
• Press resume.
• Green control cycle light will come on,
dhuttles will extend, grippers will grip, pipe
lifters will lower, and then green control
cycle light will flash.