SECTION 6: TROUBLESHOOTING
VIPER DIESEL
PAGE - 26
090058-OP_r0 (AUGUST-2014)
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
ENGINE (CONTINUED)
Gradual loss of engine power
(continued)
Engine not warmed up
Allow engine to warm up.
For additional information concerning an engine problem, consult the Engine Operator’s Manual.
COMPRESSOR
Compressor overheats
Fault:
Compressor High Temp
Shutdown
Low compressor oil level
Check oil level and refill to proper level if
necessary (ensure machine is parked on a
level surface).
Obstructed cooler fins
Clear/clean if required.
Insufficient air flow over cooler
Check for obstructions (frame, body, etc.) to
cooling air flow.
Defective temperature thermistor
Check sensor; replace if necessary.
Compressor oil filter plugged
Replace compressor oil filter.
Defective compressor thermal valve
Replace valve.
Compressor will not build up
pressure
Low compressor oil level
Check oil level and refill to proper level if
necessary (ensure machine is parked on a
level surface).
Unload solenoid valve defective
Replace solenoid valve.
Air demand too high
Check for leaks and take corrective action.
Check air tools for wear, damage, or
malfunctions. Replace or repair.
Compressor capacity too low to
accommodate demand
Substitute larger capacity compressor
system.
Compressor air filter plugged
Check air filter. Replace if necessary.
Engine does not speed up: input RPM
too slow
Check engine speed control actuator.
Engine speed control lever stuck
Free lever and lubricate if necessary.
Consult the Engine Operator’s Manual.
Service valve is open
Close service valve.
Pressure transducer is malfunctioning
Replace as necessary.
Check for proper operation with an auxiliary
air source. Replace if necessary.
Inlet valve fails to open
Repair/replace inlet valve.
Inlet valve frozen shut
Repair/replace inlet valve.
Leak in air control line
Check for leaks and take corrective action.
Continued on next page
6.2 TROUBLESHOOTING GUIDE
Fault/Malfunction
Possible Cause
Corrective Action
