Speedaire 4UP73 Operating Instructions & Parts Manual page 9

Speedaire Operating Instructions and Parts Manual
Model 4UP73
Troubleshooting Chart (Continued)
Symptom
Air leak from safety valve
Compressor is not supplying enough air to
operate accessories
Motor will not run
Knocking noise
Possible Causes
Possible defect in safety valve
1. Prolonged excessive use of air
2. Compressor is not large enough for air
requirement
3. Restricted air intake filter
4. Hole in hose
5. Check valve restricted
6. Air leaks
1. Motor overload protection switch has
tripped
2. Tank pressure exceeds pressure switch
"cut-in" pressure
3. Wrong gauge wire or length of extension
cord
4. Check valve stuck open
5. Loose electrical connections
6. Paint spray on internal motor parts
7. Possible defective motor
8. Fuse blown, circuit breaker tripped
9. Pressure release valve on pressure switch
has not unloaded head pressure
Defective check valve
9
Corrective Action
Operate safety valve manually by pulling on
ring. If valve still leaks, it should be replaced
1. Decrease amount of air usage
2. Check the accessory air
requirement. If it is higher than the
SCFM or pressure supplied by your air
compressor, you need a larger
compressor
3. Clean or replace air intake filter. Do
not operate the air compressor in a
paint spray area
4. Check and replace if required
5. Remove and clean or replace
6. Tighten fittings (See Air Leaks Section
of Troubleshooting Chart)
1. Let motor cool off and overload
switch will automatically reset
2. Motor will start automatically when
tank pressure drops below "cut-in"
pressure of pressure switch
3. Check for proper gauge wire and cord
length
4. Remove and clean or replace
5. Check wiring connection inside
pressure switch and terminal box area
6. Have checked at Service Center. Do
not operate the compressor in the
paint spray area. See flammable vapor
warning on page 2
7. Have checked at local Service Center
8. a. 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 partiular branch
circuit
b. Check for proper fuse; only "Fusetron"
Type T fuses are acceptable
c. Check for low voltage conditions and/
or proper extension cord
d. Disconnect the other electrical
appliances from circuit or operate the
compressor on its own branch circuit
9. Bleed the line by pushing the lever on the
pressure switch to the OFF position; if
the valve does not open, replace it
Remove and clean or replace
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