AIR N ARC
®
150 SERIES
SECTION 6: TROUBLESHOOTING
090043-OP_r0 (MARCH - 2015)
PAGE - 51
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
COMPRESSOR (CONTINUED)
Excess amount of oil in air
discharge
Compressor oil level too high
The correct oil level is the half-way mark on
the sight glass with the compressor shut
down, and the machine on a level surface.
Drain excess oil to correct level.
Compressor overheated/air pressure
rpms regulated too high
Adjust air pressure rpms.
Restricted air filter
Clean or replace air filter.
Improper oil viscosity
Drain and replace oil.
Worn piston rings
Replace piston rings.
Water in crankcase
Oil breaking up
Oil gets dirty; rusty valve or
cylinder
Cycle too short; compressor does not
operate long enough to vaporize
condensed moisture during
compression.
Allow for a longer operating cycle.
Compressor operating outside in cold
conditions or inlet filter not protected
against weather.
Provide adequate protection against
extreme weather conditions. Refer to
Section 6.3, Extreme Condition
Operation
.
System pressure leaking back through
check valve when compressor is
stopped
Check and replace/check valve, if
necessary.
Wrong oil being used
Drain and replace with proper oil.
Excessive vibration
Loose compressor, motor, engine or
guard
Tighten components.
Excessive discharge pressure
Reduce operating pressure.
Compressor not level
Level compressor.
Wrong oil being used
Drain and replace with proper oil.
Loose flywheel, drive pulley or drive
belts
Tighten loose components and check belts.
Worn rods, wrist pin or main bearings
Check and replace worn parts.
Compressor knocks
Compressor valves loose or broken
Check and replace worn or broken valves.
Inspect check valve; it may knock at
low pressures
Remove and clean check valve.
Bearing failure
Replace compressor.
Continued on next page
6.2 TROUBLESHOOTING GUIDE
Fault/Malfunction
Possible Cause
Corrective Action
