1 2 ” Z 1 L R B / T S C O R E D R I L L
10
Troubleshooting
Note
SERVICING SHOULD ONLY BE DONE BY A QUALIFIED TECHNICIAN.
DON’T FORGET TO UNPLUG POWER TO UNIT PRIOR TO SERVICE!
PROBLEM
SOLUTION
Motor does not turn on.
1) Check external power source (extension cord, breaker, etc).
2) Loose internal wire. Check and secure if necessary.
3) Motor brushes defective. Replace if necessary.
4) Check to ensure the motor on/off switch is operable. Replace if
necessary.
Excessive sparking
when motor is running.
1) This may indicate the presence of debris in the motor or worn out
carbon brushes. Check the brushes for unusual wear and replace
if necessary. Clean out the internal motor armature if necessary.
2) Armature has a rough edge. Inspect and replace if necessary.
Hole is not cutting.
1) Cutting bit is dull. Replace bit.
2) Work area material is not appropriate for bit type.
Bit is jammed while
coring.
1) Debris is lodged between core hole and bit. Rotate bit in both
directions to and inspect bit for debris.
2) Make sure stand is secured to work surface.
Coring speed has
reduced.
1) Bit has hit rebar. Adjust feed control to prevent motor overload
while cutting through rebar.
2) Diamonds on bit have glazed over. Deglaze bit or dress diamond
rim on bit and check water flow rate.
3) Diamonds on bit have worn away. Replace core bit.
4) New core bit. Core at slow rate with new bits for 2-3 coring cycles.
5) The safety clutch is slipping. Tighten clutch.
6) Drilling progress is prevented by an accumulation of dust. Use
suitable vacuum cleaner.
7) Water flow rate is too low. Increase water flow.
8) Core is stuck in the core bit. Remove core.
Core bit appears to
wobble.
1) Spindle is damaged. Replace spindle and check bearings.
2) Bit is bent or damaged. Replace bit.
3) The core bit is not screwed securely onto the spindle.
4) Coring material is attaching to the bit. Inspect bit and increase
water flow rate.
Water escapes at the
water swivel or gear
housing.
1) The water pressure is too high. Turn down water flow.
2) The shaft seal is defective. Replace seal
3) The water hose is damaged. Replace hose.
Chapter
4
