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temperature will be very hot, always allow cooling water to flow through the motor until the
temperature returns to normal.
RESHARPENING A GLAZED BIT
If the bit becomes glazed, resharpen by dressing with an appropriate alumina oxide or silicon carbide dressing
stone. Simply drill into the stone as many times as necessary to restore the bit's cutting performance.
VIBRATION TROUBLESHOOTING
If vibration occurs and it is not caused by embedded steel, stop drilling to find the cause and remedy.
CAUTION: Do not operate with vibration or there will be serious hazard and the diamond core bit
will be destroyed.
Vibration is usually caused by:
1. A bit with too much runout
SOLUTION: Replace bit.
2. A bit with diamond segments broken off
SOLUTION: Repair or replace bit.
3. Shifted base or loose gibs
SOLUTION: Retighten mountings or adjust gibs as needed.
MAINTENANCE
Always check for a damaged power supply cable, check for loose fasteners and always keep alert for
unusual noises and vibration when operating.
WARNING: Never operate a damaged machine. Always tag a damaged machine and take it out of
service until repairs can be made.
CAUTION: Never allow water to freeze inside the motor. If working in temperatures near 0°C, always
blow out all water from inside the motor's cooling passages with compressed air after use.
CAUTION: This machine is equipped with an oil bath gearbox. To avoid leakage of lubricating oil,
whenever the gearbox is opened, the o-ring seal must be replaced with a new one.
CAUTION: If the gear oil is found to be leaking out, have the machine repaired by a qualified service
center immediately. Running without sufficient oil will lead to certain damage of the gearbox.
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