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Conduct a Bore - 138
JT40/JT40 All Terrain Operator’s Manual
Use AutoCarve
Use AutoCarve
AutoCarve helps the operator change direction when thrust stalls in difficult soil conditions while drilling in
JT or AT dirt mode. AutoCarve rotates the bit clockwise and counterclockwise to grind away soil, clearing a
path to improve steering through tough formations. AutoCarve does not replace AT drill mode.
Operation
1.
Position downhole tool for carving.
Rotate the toolhead to the desired position.
2.
Turn on AutoCarve mode.
Press top of AutoCarve switch.
3.
Begin carving.
Move thrust control to full forward and then release to neutral to start alternating
rotation. Adjust thrust and rotation speed as needed during carving.
4.
Adjust thrust speed.
Press and hold the Resume switch until carriage begins to move forward, then
release switch. Press Resume repeatedly to increase thrust speed to desired setting. To reduce thrust
speed, press Set switch.
5.
Set carve window.
Use the Carve Window Potentiometer to set the desired range of travel. Adjust as
needed while carving.
6.
Adjust rotation speed
. Move rotation control to full clockwise rotation. Press the Set/Resume switch
to decrease/increase rotation speed. Adjust as needed while carving.
Movement
Description
alternating clockwise and
counterclockwise rotation
Enables the downhole tool to carve tough soil formations. Rotation speed
can be adjusted during autocarving.
NOTICE:
To reduce the chance of unthreading pipe sections downhole,
rotation pressure is limited during counterclockwise rotation; however, the
operator should monitor carve operation and adjust thrust and rotation to
prevent unthreading.
carve window
The range of alternating rotation.
thrust
In autocarve mode, initial thrust speed is very slow or fully stopped.
Adjust speed anytime during carving.
pullback
Thrust and rotation operate normally when joystick is pulled rearward.
High-speed pullback is not available in autocarve mode.
IMPORTANT:
•
2-speed thrust is not allowed in AutoCarve mode.
•
AutoCarve mode is disabled while front wrench is closed.
•
Adding or removing pipe does not affect AutoCarve position.
IMPORTANT:
For finer adjustment, press the multi-use button while adjusting thrust or
rotation. Be aware, however, this also activates the reaming function and will change steering
direction unless the tool is stopped at the original position before releasing multi-use button.
Summary of Contents for JT40
Page 1: ...JT40 JT40 All Terrain HRC and LRC Issue 1 0 Original Instruction Operator s Manual 053 2966 ...
Page 79: ...Controls 78 JT40 JT40 All Terrain Operator s Manual Battery Disconnect ...
Page 113: ...Drive 112 JT40 JT40 All Terrain Operator s Manual Shut Down Unit ...
Page 119: ...Transport 118 JT40 JT40 All Terrain Operator s Manual Retrieve ...
Page 147: ...Conduct a Bore 146 JT40 JT40 All Terrain Operator s Manual Remove Pullback Device ...
Page 199: ...Complete the Job 198 JT40 JT40 All Terrain Operator s Manual Stow Tools ...
Page 241: ...Service 240 JT40 JT40 All Terrain Operator s Manual As Needed ...
Page 250: ......
Page 251: ......
Page 253: ...Service Record 252 JT40 JT40 All Terrain Operator s Manual Service Performed Date Hours ...