SECTION 6: TROUBLESHOOTING
AIR N ARC
®
150 SERIES
PAGE - 44
090051-OP_r0 (FEB-2014)
Vanair Manufacturing, Inc.
vanair.com • 800-526-8817
ENGINE (CONTINUED)
Gradual loss of engine power
(continued)
Engine air filter contaminated
Check air filter. Replace if necessary (refer
to the Engine Owner’s Manual).
Fuel filter contaminated
Check fuel filter. Refer to the Engine
Owner’s Manual for additional information
on engine maintenance.
Vapor lock
Machine overloading. Allow to cool.
Refer to “Engine overheats” section in this
Troubleshooting Guide.
Fouled spark plug
Check spark plug and replace if necessary.
Refer to Engine Owner’s Manual.
Engine choke not operating properly.
Check engine choke position.
COMPRESSOR
Compressor overheats
Low compressor oil level
Check oil level and refill to proper level if
necessary.
Obstructed or restricted intake air flow
Check for obstructions (frame, body, etc.) to
air filter vents. Replace air filter if necessary.
Unloader valve(s) sticking or faulty
Clean or rebuild/replace.
Dirty compressor, head, cylinder or
intercooler
Clean with compressed air.
Operating pressure too high.
Reduce operating pressure.
Incorrect oil being used.
Drain and replace oil.
Compressor cycle too long. (Proper
cycle is 50-60% on Stop/Start
operation and 75-80% on continuous
run operation.
Allow for longer rest period between cycles.
Compressor shuts down with air
demand present
Restricted cooling air intake
Reposition machine for better surrounding
circulation.
Obstructed or restricted intake air flow
Check for obstructions (frame, body, etc.) of
air filter vents. Replace air filter if necessary.
Defective engine oil pressure switch
Replace engine oil pressure switch. Refer to
the Engine Owner’s Manual.
Continued on next page
6.2 TROUBLESHOOTING GUIDE
Fault/Malfunction
Possible Cause
Corrective Action
