V4.0
7.5A Rotary Hammer
8532251
Visit www.princessauto.com for more information
11
6. When installing the carbon brushes make sure the carbon portions of the
carbon brushes contact the motor armature, and that the springs face
away from the motor. Also, make sure the springs operate freely.
7. Replace the brush caps. Do not overtighten.
8. Run the tool for a while to help shape the new carbon brushes.
IMPORTANT! New carbon brushes tend to spark when first used until they
wear and conform to the motor's armature.
DISPOSAL
Recycle a tool damaged beyond repair at the appropriate facility.
Contact your local municipality for a list of disposal facilities or by-laws for
electronic devices, batteries, oil or other toxic liquids.
TROUBLESHOOTING
Visit a Princess Auto Ltd. location for a solution if the tool does not function
properly or parts are missing. If unable to do so, have a qualified technician
service the tool.
Problem(s)
Possible Cause(s)
Suggested Solution(s)
Electric
motor does
not rotate
switch on
power
supply
1. Breakage of power supply
2. Poor contact of no effect of
the switch
3. Armature winding or field
winding has been burnt
4. Breakage of the stator winding
5. Brushes are worn out
1. Inspect power supply
2. Repair or change the switch
3. Change the armature winding
or field winding.
4. Weld again if terminal the
winding
5. Change the carbon brushes
Abnormal
noise and
electric
motor does
not rotates
or rotates
very slowly.
1. The contact of the switch has
been burnt.
2. Mechanical part is blocked.
3. Overload of electric motor
caused by excessive drilling
depth or pressure.
4. Partial short circuit or open
circuit of armature.
5. Lower voltage of main power
1. Repair or change the switch.
2. Check mechanical part.
3. Reduce drilling depth or
pressure. Decrease force.
4. Repair or change the
armature.
5. Adjust the voltage of main
power
