DeVillbiss Air Power Company MG1-UMCCOMP-3 - Manual (Page 10)

10 - ENG
TROUBLESHOOTING GUIDE (Continued)
CORRECTION CAUSE
Possible defect in safety valve.
Knocking Noise
Compressor is not supplying
enough air to operate accesso-
ries. Prolonged excessive use of air. Decrease amount of air usage.
Hole in hose.
Remove and clean, or replace.
Air leaks. Tighten fittings. (See Air Leaks Section of Trou-
bleshooting Guide.)
Motor will not run.
Check valve restricted.
Check and replace.
Check the accessory air requirement. If it is higher than
the SCFM or pressure supplied by your air compres-
sor, you need a larger compressor. Compressor is not large enough for air
requirement.
Defective check valve. Remove and clean, or replace.
Operate safety valve manually by pulling on ring. If
valve still leaks, it should be replaced. Air leak from safety valve.
PROBLEM
Motor will start automatically when tank pressure
drops below “cut-in” pressure of pressure switch. Tank pressure exceeds pressure switch
“cut-in” pressure.
Check for proper gauge wire and cord length. Wrong gauge wire or length of exten-
sion cord.
Loose electrical connections. Check wiring connection inside pressure switch and
terminal box area.
Remove and clean, or replace. Check valve stuck open.
Paint spray on internal motor parts. Have checked at an Authorized Warranty Service
Center. Do not operate the compressor in the paint
spray area. See flammable vapor warning.
Possible defective motor.
Have checked at an Authorized Warranty Service
Center.
1. Check fuse box for blown fuse and replace, if
necessary. Reset circuit breaker. Do not use a
fuse or circuit breaker with higher rating than that
specified for your particular branch circuit.
2. Check for proper fuse.
3. Check for low voltage conditions and/or proper
extension cord.
4. Disconnect the other electrical appliances from
circuit or operate the compressor in its own
branch circuit.
Fuse blown, circuit breaker tripped.
Damaged regulator. Replace regulator. Regulator knob has continuous
air leak. Regulator will not shut off
at air outlet.