Ditch Witch JT1220 - Manual (Page 62)

JT1220 Mach 1 Operator’s Manual
Operation Overview - 61
Drilling
CMW
Drilling
1. Start system. See page 96.
2. Prime drilling fluid pump. See page 96.
3. Engage tracker control if desired. See page 129.
4. Drill first pipe. See page 102.
5. Record bore path. See page 107.
6. Enable automated pipeloader system. See page 103.
7. Add pipe. See page 104.
8. Drill remaining pipes in pipe box.
• Correct direction. See page 106.
• Engage cruise control. See page 148.
• Shift pipe box. See page 143.
9. Add up to a single column of drill pipe to empty box to complete bore.
10. Surface drill head. See page 108.
Backreaming
1. Assemble backream string. See page 109.
2. Start drilling unit and adjust throttle. See page 80.
3. Set drilling fluid flow. Check that fluid flows through all nozzles. See page 135.
4. Remove pipe from bore. See page 111.
5. Remove up to a single column of drill pipe from full box to complete backream.
6. Remove pullback device. See page 113.
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.