Operation, Jt20 operator’s manual – Ditch Witch JT20 User Manual
Page 102
JT20 Operator’s Manual
Conduct a Bore - 101
Use AutoCarve
CMW
®
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. Push joystick fully forward 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 joystick fully left of neutral. Press the Set/Resume switch to decrease/
increase rotation speed. Adjust as needed while carving.
7.
Pause carving. Pull joystick away from neutral.
8.
Resume carving. Push joystick fully forward then release to neutral to start alternating rotation.
9.
Ream a newly carved section. After carving a few inches, press and hold the 2-Speed (multi-use)
button and move the joystick fully left for maximum rotation. When tool rotates freely, reduce rotation
speed and stop at desired carve position. Release 2-Speed button and resume carving.
10. Exit carve mode. Press bottom of AutoCarve switch. Carriage movement and rotation will stop.
Continue normal drilling.
Note: For quicker setup during a long bore, AutoCarve thrust and rotation settings are retained until
the unit is shut down.
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.
IMPORTANT: If full rotation seems restricted and insufficient to ream the hole, move carriage
back slightly until full rotation is possible, then move carriage forward while rotating.