Ditch Witch JT20 - Manual (Page 25)

Operation Overview - 24
JT20 Operator’s Manual
Backreaming
CMW
®
Backreaming
1. Assemble backream string. See page 104.
2. Start drilling unit and adjust throttle.See page 76.
3. Set drilling fluid flow. Check that fluid flows through all nozzles. See page 119.
4. Remove pipe from bore. See page 105.
5. Remove up to a single column of drill pipe from full box (see page 128) to complete backream.
6. Remove pullback device. See page 107.
Backreaming Tips
• Plan backreaming job before drilling. Plan bore path as straight as possible. Check bend limits of
pullback material. Check that appropriate pullback devices are on hand.
• Keep all bends as gradual as possible.
• Drilling fluid quality is a key factor in backreaming success. Contact your Ditch Witch
®
dealer for
information on testing water, selecting additives, and mixing drilling fluid.
• Backreaming requires more fluid than drilling. Make sure enough fluid is used.
Leaving Jobsite
1. Remove downhole tools. See page 107.
2. Remove anchors. See page 111.
3. Rinse unit and downhole tools. See page 154.
4. Disassemble strike system and disconnect from fluid system. See page 154.
5. Stow tools. See page 154.
6. Load unit onto trailer. See page 80.
Storing Equipment
1. For cold weather storage, antifreeze drilling unit. See page 152.
2. For long-term storage, disconnect battery disconnect switch.