Ditch Witch JT922 - Manual (Page 48)

JT922 Operator’s Manual
Operation Overview - 47
Backreaming
CMW
Backreaming
1. Assemble backream string. See page 87.
2. Start drilling unit and adjust throttle.
3. Set drilling fluid flow. Check that fluid flows through all nozzles.
4. Remove pipe from bore. See page 89.
5. Remove pullback device. See page 90.
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 90.
2. Remove anchors. See page 94.
3. Rinse unit and downhole tools. See page 124.
4. Disassemble strike system and disconnect from fluid system. See page 125.
5. Stow tools. See page 125.
6. Load unit onto trailer. See page 70.
Storing Equipment
1. For cold weather storage, antifreeze drilling unit. See page 122.
2. For long-term storage, disconnect battery disconnect switch.