8532251
7.5A Rotary Hammer
V4.0
12
For technical questions call 1-800-665-8685
Problem(s)
Possible Cause(s)
Suggested Solution(s)
The surface
of the
gearbox
becomes
over hot.
1. Overload, dull bit
2. Damp winding
3. Electric motor can’t run freely
because of incorrect fitting
4. Decrease of voltage
1. Reduce load, sharpen bit
2. Dry the winding
3. Check the armature to the
see if it is blocked or rubs the
core.
4. Adjust the voltage of main
power.
Round
sparkle or
bright
sparkle of
commutator
1. Short circuit or breakage of
armature
2. The surface of the armature is
not smooth and clean
1. Repair the armature
2. Free from foreign objects to
smooth the surface of the
armature
