Ditch Witch JT40, Operator'S Manual

Page: 104 / 253

JT40/JT40 All Terrain Operator’s Manual
Prepare - 103
Check Supplies and Prepare Equipment
Select Drilling Mode
Three drilling setups are available with this unit:
• AT 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.
Prepare Drilling Unit
AT Mode
• Verify unit has not been converted to JT mode. Install SaverLok
®
body, pipe loader accessories, pipe
guides, and wrench inserts for AT pipe.
• Inspect Rockmaster
®
tool and select bit based on jobsite conditions.
• Use appropriate anchors for jobsite conditions.
• Load All Terrain pipe and pipe box onto unit.
• Move mode selector switch to AT position.
Mode Situation used Downhole tools Capabilities
AT Rock, soft rock, other non-compressible
soils. Any other situation with difficult
steering because of hard soil
conditions. • All Terrain drill pipe
• Rockmaster
®
tool
• 40,000 lb (178 kN)
of thrust
• 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
(p/n 400-1383)
• standard JT tools
• 40,000 lb (178 kN)
of thrust
• no inner rotation
JT Soft or intermittent soft rock or other
compressible soils. • JT drill pipe
• standard JT tools
• 40,000 lb (178 kN)
of thrust
• no inner rotation