Operating Instructions
AIR FILTER
Never run the compressor pump
without an intake air filter nor
with a clogged intake air filter. Use
compressed air to blow the filter clean.
Do not wash or oil the element. If it
cannot be blown clean, the filter must
be replaced. Operating compressor
with a dirty filter can cause high
oil consumption and increase oil
contamination in the discharge air.
INTERCOOLER (TWO-STAGE
COMPRESSORS ONLY)
Intercooler fins
are sharp, always
wear gloves and use care when you
clean or work near the intercooler.
Weekly, check the intercooler to
be sure all fittings are secure and
tight. Blow all dirt, dust and other
accumulations from the intercooler
fins.
COMPONENTS
Turn off all power and use light air
pressure to blow dust and foreign
material from cylinder head, motor, fan
blades, air lines, intercooler and tank
on a monthly basis.
Troubleshooting Chart
Symptom
Possible Cause(s)
Motor hums and
1. Low voltage or no voltage
runs slowly or not
at all
2. Shorted or open motor winding
3. Malfunctioning check valve or
unloader valve
4. Malfunctioning pressure switch -
contacts will not close
Reset mechanism
1. Pressure switch set too high
cuts out repeatedly
2. Malfunctioning check valve
or fuses blow
3. Incorrect fuse size
repeatedly
4. Malfunctioning motor
5. Loose Wiring
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BELTS
Lock out and tag
the power then
release all pressure from the tank to
prevent unexpected movement of the
unit.
Check belt tension every 3 months.
Adjust belt tension to allow 3/8 to 1/2
inch deflection with normal thumb
pressure. Also, align belts using a
straight edge against the face of the
flywheel and touching the rim on both
sides of the face. The belts should be
Air Compressor
Flywheel
Straight Edge
Figure 7 - Top View
Operation
Check Safety Valve
Drain Tank (See Figure 4)
Check Oil Level
Clean or Change Air Filter
Check Intercooler (two-stage
compressors only)
Clean Unit Components
Check Belt Tightness
Change Oil (See Figure 3)
Corrective Action
1. Check with voltmeter, check reset switch on motor. If reset switch trips
repeatedly, find and correct the cause. See next item
2. Replace motor
3. Replace check valve or unloader valve
4. Repair or replace pressure switch
1. Adjust or replace
2. Clean or replace faulty valve
3. Be sure that fuses are rated properly
4. Replace motor
5. Check all electrical connections
6
parallel to this straight edge (see
Figure 7). Dimension A should be the
same as B and C to ensure proper
alignment of the belts.
Slots in the bed-plate allow for sliding
the motor back and forth to adjust belt
tension.
STORAGE
If compressor is to be stored for a short
period of time, make sure that it is
stored in a normal position and in a
cool protected area.
A
B
Setscrew
MAINTENANCE SCHEDULE
Daily
Weekly
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Motor
Drive
Pulley
Motor
C
Monthly
3 Months
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