Diamond Products UDM - Manual (Page 19)

Removing a Stuck Bit
1. Release the Drill Down button or turn off the Auto
Drill switch. Press the Drill Up or Drill Down button
and Turbo button together to raise and lower the
bit to try and free it. Note: If the bit is not spinning,
turn the Drill Rpm cartridge on and off to try and
get the bit to spin (this will cause the drill motor
pressure to max out). If the bit is spinning, try to
keep it spinning while attempting to raise the bit.
Continue with step 2 if this attempt fails.
2. If the bit has moved toward the rear of the hole,
lower the rear legs slightly to attempt to realign the
bit. If the bit has moved toward the front of the
hole, raise the rear legs slightly to attempt to
realign the bit. Use the Drill Up and Drill Down
button while slightly raising and lowering the rear
legs or front mast in an attempt to find the break-
free position. Continue with step 3 if this attempt
fails.
3. Turn off the Drill Rpm cartridge.
4. Move the function switch to Start/Drive.
5. Turn off the engine.
6. Grasp the flats near the top of the spindle using
the wrench provided and turn counterclockwise
to disconnect the spindle shaft from the bit.
7. Move the machine away from the bit. Note: It may
be necessary to start the machine, lower the tires,
and raise the cylinder for proper ground
clearance.
8. Thread a piece of threaded rod (1-1/4-7) through
the hub until it contacts the concrete.
9. Place two hex nuts on the rod end and lock them
against each other.
10. Grasp both nuts using a wrench and turn to push
the rod against the concrete, which will pull the bit
out of the concrete.
NOTE: Inspect the bit for damages and clean or
replace as necessary.
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