Section 5: Service; Troubleshooting - Grizzly T21888 Instruction Manual

section 5: 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 overheats and
thermal overload turns
motor OFF.
loud repetitious noise
coming from air com-
pressor.
Compressor knocking.
model t21888 (mfg. since 2/10)

troubleshooting

possible cause
1. tank already pressurized.
2. thermal overload switch
has tripped.
3. start capacitor is at fault.
4. short circuit in motor or
cord, or loose connec-
tions.
5. pressure switch is bad.
6. thermal overload tripped.
7. motor is at fault.
1. Compressor and motor
have restricted air flow.
2. Air filter clogged.
3. thermal overload switch
has tripped.
1. motor fan is hitting the
cover.
1. improper oil level.
2. Air filter clogged.
3. piston assembly loose.
possible solution
1. motor will not start if tank
is fully pressurized.
2. Wait 30 minutes for motor
to cool, then push reset.
3. replace start capacitor.
4. inspect and repair all
connections on motor for
loose or shorted termi-
nals or worn insulation.
5. replace or adjust the
pressure switch (page
20).
6. push in reset button.
7. replace motor.
1. Clean cylinder fins, motor
fan, and vent area.
2. inspect and clean air fil-
ter.
3. reduce load on com-
pressor and allow longer
cool down periods.
1. Adjust fan cover mount-
ing position, tighten fan,
or shim fan cover.
1. Check oil level and add
oil (page 20).
2. inspect and clean air fil-
ter.
3. inspect and repair piston
and connecting rod.
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