Ditch Witch JT60AT - Manual (Page 79)

JT60/JT60 All Terrain Operator’s Manual
Prepare - 79
Check Supplies and Prepare Equipment
Select Drilling Mode
Three drilling setups are available with this unit:
• AT rock mode
• AT dirt mode
• JT mode
Select the best setup based on jobsite conditions.
Once drilling mode has been selected, configure drilling unit to match mode.
Mode Situation used Downhole tools Capabilities
AT
Rock Rock, soft rock, other non-compressible
soils. Any other situation with difficult
steering because of hard soil
conditions. • All Terrain drill pipe
• Rockmaster tool
• 60,000 lb (266 kN)
of thrust
• dither
• inner rotation
AT
dirt When one bore out of several can be
better or more quickly done with
conventional downhole tools. This bore
is such that changing to JT pipe is not
practical. • All Terrain drill pipe
• beacon housing
• transition sub
• standard JT tools
• 60,000 lb (266 kN)
of thrust
• dither
• no inner rotation
JT Soft or intermittent soft rock or other
compressible soils. • JT drill pipe
• standard JT tools
• 60,000 lb (266 kN)
of thrust
• no dither
• no inner rotation