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VT6315, VT6358, VT6361
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Operating Instructions
Troubleshooting Chart (Continued)
Symptom Possible Cause(s) Corrective Action
Large quanity of oil in
the discharge air
NOTE: In an oil lubricated
compressor there will
always be a small amount
of oil in the air stream.
1. Worn piston rings 1. Replace with new rings. Maintain oil level and change oil more
frequently.
2. Compressor air intake restricted 2. Clean filter. Check for other restrictions in the intake system.
3. Excessive oil in compressor 3. Drain down to full level.
4. Wrong oil viscosity 4. Use Mobil 1
®
10W-30.
Water in discharge air /
tank
Normal operation. The amount of
water increases with humid weather
1. Drain tank more often. At least daily.
2. Add a filter to reduce the amount of water in the air line.
Motor hums and runs
slowly or not at all
1. Use of extension cord 1. Do not use an extension cord. Use longer air hose with larger
diameter.
2. Malfunctioning check valve or
unloader valve
2. Replace check valve, unloader valve or pressure switch.
Do not disassemble check
valve with air pressure in tank
3. Low voltage 3. Check with voltmeter, check reset switch on motor. If reset switch
trips repeatedly, find and correct the cause. See next item.
4. Malfunctioning pressure switch -
contacts will not close
4. Repair or replace pressure switch.
Reset mechanism cuts
out repeatedly or fuses
blow repeatedly
1. Too many devices on same circuit 1. Limit the circuit to the use of only the air compressor.
2. Incorrect fuse size or circuit breaker 2. Be sure that fuses or circuit breakers are rated properly.
3. Malfunctioning check valve
3. Replace check valve.
Do not disassemble check
valve with air pressure in tank
4. Pressure switch set too high 4. Adjust or replace.
5. Loose wiring 5. Check all electrical connections.
6. Malfunctioning motor 6. Replace motor.
Tank does not hold
pressure when
compressors off and the
shut off valve is closed
1. Worn check valve
1. Replace check valve.
Do not disassemble check
valve with air pressure in tank
2. Check all connections and fittings
for leaks
2. Tighten.
3. Check tank for cracks or pin holes 3. Replace tank. Never repair a damaged tank.
Pressure switch
continuously blows air
out the unloader valve
Malfunctioning check valve Replace the check valve if the unloader valve bleeds off constantly.
Do not disassemble check
valve with air pressure in tank
Pressure switch does
not release air when
the unit shuts off
Malfunctioning unloader valve on
pressure switch
Replace the pressure switch if it does not release the pressure for a
short period of time when the unit shuts off.
Do not disassemble check
valve with air pressure in tank
Excessive vibration 1. Loose fasteners 1. Tighten.
2. Belt needs replaced 2. Replace with correct size.
3. Belt alignment 3. Align flywhell and pulley.