Grainger CIAO 6 Operating Instructions Manual page 13

CAUSE
Power cord not plugged in.
Motor/Pressure switch in "OFF" position.
Motor thermal overload switch has tripped.
Fuse blown or circuit breaker has tripped.
Wrong gauge wire or length of extension cord.
Pressure release valve on motor/pressure switch has not
unloaded pump head pressure
Tank check valve stuck open
Defective motor, capacitor, pressure switch, or check
valve.
Lack of oil in the pump.
Carbon deposits on pistons or valves.
Bearing, piston or connecting rod failure.
Symptom 3. When in the start/stop option, motor runs continuously
Air compressor is incorrectly sized.
Symptom 4. Air continues to leak at motor/pressure switch relief valve after motor stops.
Defective check valve, is stuck open.
Symptom 5. Air continues to leak at motor/pressure switch release valve while motor is running.
Defective motor/pressure switch.
Possible defective safety relief valve.
Excessive air tank pressure.
Defective gasket
6. TROUBLESHOOTING
Symptom 1. Motor will not run or restart.
Plug cord into grounded outlet.
Move switch to "AUTO" position.
Turn air compressor off, wait until motor is cool, then press
motor thermal overload (red) button firmly until click is
heard.
Replace fuse or reset circuit breaker.
Check for proper fuse; only "Fusetron" type T fuses are
acceptable.
Check for low voltage conditions.
Disconnect any other electrical appliances from circuit or
operate air compressor on its own branch circuit.
Check chart on page #10 for proper gauge wire and cord
length.
Bleed the line by moving the switch to the "Off" position
Remove and clean or replace
Contact Customer Service.
Symptom 2. Noisy operation
Add correct amount of oil. Check for bearing damage.
Remove cylinder head and inspect. Clean or replace.
STOP THE COMPRESSOR!
Contact Customer Service.
Limit the air pressure to the capacity of the air compressor.
Either use a smaller tool or a larger air compressor.
Remove, clean or replace.
Replace
Symptom 6. Air leaks from safety relief valve.
Operate safety relief valve manually by pulling on ring.
If it still leaks, it should be replaced.
Defective pressure switch. Replace.
Symptom 7. Air leaks at pump
Replace and torque head bolts to 8 ft./lbs
13
REMEDY