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SECTION 7: SERVICE
Symptom
Motor will not start.
Motor will not start; fuses or circuit break-
ers blow.
Motor fails to develop full power (output
of motor decreases rapidly with decrease
in voltage at motor terminals).
Motor overheats.
Motor stalls (resulting in blown fuses or
tripped circuit).
Loud repetitious noise coming from
machine.
Difficult to pull lever down during machine
operation.
Mortising bit and chisel are extremely
noisy and chatter. (An average amount
of noise and chatter are normal for any
mortising machine.)
Moritising bit and chisel generate smoke
and burn the workpiece.
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Troubleshooting
Possible Cause
1. Low voltage.
2. Open circuit in motor or loose connec-
tions.
1. Short circuit in line cord or plug.
1. Power line overloaded with lights, appli-
ances, and other motors.
2. Undersized wires or circuits too long.
3. General overloading of power company
facilities.
1. Motor overloaded.
2. Air circulation through the motor
restricted.
1. Short circuit in motor or loose connec-
tions.
2. Low voltage.
3. Incorrect size fuses or circuit breakers.
4. Motor overloaded.
1. Motor fan is hitting the cover.
1. Drill bit does not protrude enough from
the end of the chisel.
2. Chisel or drill bit is dull.
3. Mortising operating handle is not posi-
tioned for maximum leverage.
1. Drill bit out of alignment with chisel.
2. The chisel mounting bushing is loose
or damaged causing poor drill bit-to-
chisel alignment.
3. The chisel or drill bit is bent.
1. The drill bit is dull.
2. Drilling pressure is too aggressive and
overheats the drill bit.
3. Wood chips load up in the chisel and
overheat the drill bit.
4. Wood is too green, has high moisture
content, or is pressure treated.
Possible Solution
1. Check power line for proper voltage.
2. Inspect all lead connections on motor
for loose or open connections.
1. Repair or replace cord or plug for dam-
aged insulation and shorted wires.
1. Reduce load on power line.
2. Increase wire sizes or reduce length of
the circuit.
3. Request a power check from the power
company.
1. Reduce load on motor.
2. Clean out motor to provide normal air
circulation.
1. Replace motor connections with loose/
shorted terminals or worn insulation.
2. Correct the low voltage conditions.
3. Install correct fuses or circuit breakers.
4. Reduce load on motor.
1. Adjust fan cover mounting position,
tighten fan, or shim fan cover.
1. Adjust the drill bit depth.
2. Sharpen/replace drill bit and chisel.
3. Adjust the handle for maximum length,
and position the handle so you have
the maximum leverage at the hardest
mortising depth.
1. Reinstall chisel in a different position.
2. Replace bushing, using care not to
over-tighten the chisel retaining lock
bolt.
3. Replace the chisel and drill bit as a
matched set.
1. Sharpen/replace drill bit and chisel.
2. Adjust drill bit depth, reduce drilling
pressure, clear chips often.
3. Apply small amount of bees wax to
drill bit; face chisel slot sideways; clear
chips often.
4. Only mortise dry, untreated wood.
G0448 Mortising Machine
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