VIPER DIESEL
SECTION 6: TROUBLESHOOTING
090058-OP_r0 (AUGUST-2014)
PAGE - 27
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
COMPRESSOR (CONTINUED)
Compressor system over-
pressures
Fault:
Compressor High Press
Shutdown or safety relief valve
Unload solenoid valve defective
Replace solenoid valve.
Restricted or plugged bleed orifice
Clean if soiled; if ice is present, clear and
remove.
Damaged/kinked control line
Check line for damage (wear, kinks, etc.).
Re-route, re-tie or replace if necessary.
Control line connections are not prop-
erly seated/poor connection quality
Check lines for proper seating/ensure line
ends have been cut cleanly and are square
(
DO NOT
use wire cutters: use a loom cut-
ting tool or a clean, sharp razor blade).
Inlet valve poppet not seating correctly. Valve will need to be dis-assembled to
check; consult with Service Department.
Inlet valve piston is stuck in open posi-
tion.
Check for proper operation with an auxiliary
air source—replace or rebuild inlet valve.
Compressor shaft seal is leaking
Replace shaft seal with available kit.
Pressure transducer is malfunctioning
Check transducer for proper operation;
replace if necessary and check controls.
Defective safety valve
Replace safety valve.
Plugged coalescer
Replace coalescer element.
No service air output (See also
Compressor will not build up
pressure
)
If equipped, OSHA valve/velocity fuse,
not functioning properly
Reset or replace OSHA valve.
Minimum pressure/check valve is
malfunctioning
Rebuild or replace check valve.
Low service air output (See also
Compressor will not build up
pressure
)
Clogged compressor air filter
Check air filter. Replace if necessary.
Solenoid valve sending continuous
signal to inlet valve
Rebuild or replace solenoid valve if
defective.
Incorrect compressor speed
Adjust engine speed. Refer to
Section
5.5.1, Adjusting the Engine Speed
.
Minimum pressure/check valve is
malfunctioning
Rebuild or replace check valve.
Compressor stalls
Idle speed is set too low
Adjust idle speed; consult factory.
Excess amount of oil in air
discharge
Machine not on level surface
Move machine to level surface.
Continued on next page
6.2 TROUBLESHOOTING GUIDE
Fault/Malfunction
Possible Cause
Corrective Action
