6
EVERY 6 MONTHS, 1800 OPERATING HOURS
OR AFTER EACH 50,000 MILES
—
WHICHEVER
OCCURS FIRST
—
PERFORM THE FOLLOWING
INSPECTIONS AND TESTS.
AIR INDUCTION
The Bendix
®
SNA-01
™
compressor is designed for
connection to the vacuum side of the engine’s air induction
system only.
A supply of clean air is one of the single most important
factors in compressor preventive maintenance. Since
the air supply for SNA-01 compressor and engine is the
engine air cleaner, periodic maintenance of the engine air
filter is necessary.
Inspect the compressor air induction system each time
engine air cleaner maintenance is performed.
1. Inspect the intake hose adapters for physical damage.
Make certain to check the adapters at both ends of the
intake hose or tubing.
2. Inspect the intake hose clamps and tighten them if
needed.
3. Inspect the intake hose or line for signs of drying,
cracking, chafing and ruptures and replace if necessary.
4. Verify that the compressor inlet fitting is tight (check
torque) and aligned properly to the hose. If kinks
exist, the fitting should be loosened, realigned and
retightened.
5. Any metal tubes should also be tight (torqued properly)
to the mating fitting. Inspect the metal tubes for any
cracks or breaks and replace if necessary.
COMPRESSOR COOLING
Inspect the compressor discharge port, inlet cavity, and
discharge line for evidence of restrictions and carbon
buildup. If more than 1/16" of carbon is found, thoroughly
clean or replace the affected parts. In some case, carbon
buildup indicates inadequate cooling. Closely inspect the
compressor cooling system. Check all compressor coolant
lines for kinks and restrictions to flow. Minimum coolant line
size is 3/8" Inside Diameter (I.D.) Check coolant lines for
internal clogging from rust scale. If coolant lines appear
suspicious, check the coolant flow and compare to the
tabulated technical data present in the back of this manual.
Carefully inspect the air induction system for restrictions.
LUBRICATION
Check the external oil supply line for kinks, bends, or
restrictions to flow. Supply lines must be a minimum of
3/16” I.D. Refer to the tabulated technical data in the back
of this manual for oil pressure minimum values.
Check the exterior of the compressor for the presence of
oil seepage and refer to the TROUBLESHOOTING section
for appropriate tests and corrective action.
OIL PASSING
All reciprocating compressors pass a minimal amount of
oil. Air dyers will remove the majority of oil before it can
enter the air brake system. For particularly oil sensitive
systems, the Bendix
®
PuraGuard
®
system can be used in
conjunction with a Bendix
®
air dryer.
If compressor oil passing is suspected, refer to the
TROUBLESHOOTING section (starting on page A-1) for
the symptoms and corrective action to be taken. In addition,
Bendix has developed the “Bendix Air System Inspection
Cup” (BASIC
™
) kit to help substantiate suspected excessive
oil passing.
The steps to be followed when using the BASIC
kit are presented in APPENDIX B, on page A-16.
FIGURE 9 -
BENDIX
®
SNA-01
™
COMPRESSOR CYLINDER
HEAD
Discharge
Jumper
Attach Bolt
(Qty. 4)
Discharge
Port
Inlet Port
(Fitting
Pre-Installed)
Unloader
Cover
Coolant In
(Fitting
Pre-Installed)
Safety
Valve
Governor
Connection
Accessory Attach
Holes
M8x1.25 (2 Places)
Coolant Out
CYLINDER HEAD PORT IDENTIFICATION
The cylinder head connection ports are identified with
cast in numerals as follows:
0
Air In
2
Compressed Air Out
9
Coolant In or Out
4
Governor Control
