Speedaire 4B242A Manual De Instrucciones Y Lista De Repuestos página 8

Speedaire Operating Instructions and Parts Manual
Models 4B242A and 4B243A
TROUBLESHOOTING GUIDE FOR UNITS IN SERVICE FOR A PERIOD OF TIME (CONTINUED)
Symptom
Milky oil in crankcase
E
N
G
L
I
S
Pressure switch continually
H
blows air out the unloader
valve
Pressure switch does not
release air when the
compressor shuts off.
Compressor will not shut off
Unit vibrates excessively
Water in discharge air
Possible Cause(s)
1. Low usage of compressor -
water is condesing in the
crankcase
2. Wrong type of oil
3. Improper environment
4. Rotation incorrect
Defective check valve
Pressure switch unloader not
working properly
1. Defective pressure switch
2. Defective safety valve
1. Loose fasteners
2. Loose pulley, loose belt or
misalignment or pulleys
3. Defective pump
1. Hot humid weather
Corrective Action
1. Run the compressor continuously for 1 hour. The heat
generated during this running period will evaporate the
moisture out of the oil
2. Do not use SAE-30 automotive type oil. Using the wrong
oil can cause various problems with the pump and will void
the warranty. Only use the oils that the operating manual
recommends
3. Unit should not be installed in a poorly vented area
or exposed to extreme cold or hot conditions. Normal
operating range should be between 32°F and 100°F
4. Check to make sure the compressor is running the direction
of the flywheel arrow. Air flow should be so that the
flywheel directs air across the head of the pump. Standing
in front of the compressor (non-belt guard side) air should
flow back to front
Replace check valve
Drain the tank of all pressure. Restart compressor under no
load. If compressor is able to start, then the unloader needs
to be checked. If this problem is not corrected it will fail the
motor and / or other electrical components
1. Setting too high. Replace pressure switch
2. Make sure tank pressure gauge is reading correctly and if
necessary replace tank safety valve
1. This includes mounting bolts for the pump, motor, belt
guard, mag. starter, etc. Check for loose fasteners as part
of a routine maintenance schedule. Tighten any loose
fasteners
2. The pulley and belt may need to be tightened over time.
The pulleys may need to be realigned to assure proper belt
wear and lower vibration. These should be checked as part
of regular maintenance
3. A defective pump includes knocking or making noises
not normal to the pump design. Severe oil out the
breather usually indicates ring or cylinder wear. Low pump
performance could indicate valve problems. There are
numerous symptoms associated with a defective pump. The
pump will need to be evaluated
1. During hot and humid weather it is normal to accumulate
water in the compressor tank. This is normal and requires
frequent draining of tank. We recommend use of an
automatic drain along with filters and dryers if this is a
problem
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4B242A and 4B243A
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