Grizzly G470 - Manual (Page 19)

Model G0464/G0465/G0467/G0468/G0470 Air Compressors - 17
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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 Possible Cause Possible Solution
Motor will not start. 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. 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.
Motor fails to develop
full power (output of
motor decreases rapidly
with decrease in volt-
age at motor terminals). 1. Power line overloaded
with lights, appliances,
and other motors.
2. Undersized wires or cir-
cuits too long.
1. Reduce load on power
line.
2. Increase wire sizes or
reduce length of the cir-
cuit.
Motor overheats and
thermal overload turns
motor
OFF.
1. Cooling fins dirty.
2. Air filter clogged.
3. Compressor is running
too long without a break.
4. Air circulation through the
motor restricted.
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.
Troubleshooting