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SECTION 6: SERVICE
This section is provided for your convenience—it is not a substitute for the Grizzly Service
Department. If you need help troubleshooting, replacing parts, or you are unsure of how
to perform the procedures in this section, then feel free to call our Technical Support at
(570) 546-9663.
Symptom
Motor will not start.
Motor fails to develop
full power (output of
motor decreases rapidly
with decrease in volt-
age at motor terminals).
Motor overheats and
thermal overload turns
motor OFF.
Model G0471 3 HP Air Compressor
Troubleshooting
Possible Cause
1. Tank already pressurized.
2. Thermal overload switch
has tripped.
3. Low voltage.
4. Short circuit in motor or
cord, or loose connec-
tions.
5. Incorrect fuses or circuit
breakers in power line.
6. Pressure switch is bad.
1. Power line overloaded
with lights, appliances,
and other motors.
2. Undersized wires or cir-
cuits too long.
1. Cooling fins dirty.
2. Air filter clogged.
3. Compressor is running
too long without a break.
4. Air circulation through the
motor restricted.
Possible Solution
1. Motor will not start if tank
is fully pressurized.
2. Wait for motor to cool.
3. Check power line for
proper voltage.
4. Inspect all connections on
motor for loose or shorted
terminals or worn insula-
tion.
5. Install correct fuses or cir-
cuit breakers.
6. Replace the pressure
switch.
1. Reduce load on power
line.
2. Increase wire sizes or
reduce length of the cir-
cuit.
1. Clean cylinder fins and
motor area.
2. Inspect and clean air filter.
3. Do not use air tools with
CFM needs that exceed
the compressor CFM rat-
ing.
4. Clean out motor to pro-
vide normal air circula-
tion.
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