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troubleshooting
problem
Tool will not start.
1. Power cord disconnected.
2. No power at outlet.
3. Tool's thermal reset breaker
4. Internal damage or wear.
Tool operates slowly. 1. Forcing tool to work too fast.
2. Extension cord too long or
Performance
1. Carbon brushes worn
decreases over time.
2. Bit dull or damaged.
Excessive noise
Internal damage or wear. (Carbon
or rattling.
brushes or bearings, for example.)
Overheating.
1. Forcing tool to work too fast.
2. Bit dull or damaged.
3. Blocked motor housing vents.
4. Motor being strained by long or
Follow all safety precautions whenever diagnosing or servicing the tool.
Disconnect power supply before service.
record product's Serial number Here:
note: if product has no serial number, record month and year of purchase instead.
note: Replacement parts may be available for this item.
Visit harborfreight.com/parts for a list of in stock parts. Reference UPC 1 93175504364.
Item 64121
possible causes
tripped (if equipped).
(Carbon brushes or
Trigger, for example.)
cord diameter too small.
or damaged.
small diameter extension cord.
For technical questions, please call 1-888-866-5797.
Likely Solutions
1. Check that power cord is plugged into AC outlet.
2. Check power at outlet. If outlet is unpowered,
turn off tool and check circuit breaker.
If breaker is tripped, make sure circuit is right
capacity for tool and circuit has no other loads.
3. Turn off tool and allow to cool.
Press reset button on tool.
4. Have technician service tool.
1. Allow tool to work at its own rate.
2. Eliminate use of extension cord. If an
extension cord is needed, use one with
the proper diameter for its length and load.
See Extension Cords on page 6.
1. Have qualified technician replace brushes.
2. Keep bits sharp. Replace as needed.
Have technician service tool.
1. Allow tool to work at its own rate.
2. Keep bits sharp. Replace as needed.
3. Wear ANSI‑approved safety goggles and
NIOSH‑approved dust mask/respirator while
blowing dust out of motor using compressed air.
4. Eliminate use of extension cord. If an
extension cord is needed, use one with
the proper diameter for its length and load.
See Extension Cords on page 6.
Page 11
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