7
DRY ELEMENT - PLEATED PAPER STRAINER
Every two months, 800 operating hours or 20,000 miles
whichever occurs first, loosen the spring clip from the
unhinged side of the mounting baffle and open the cover.
Replace the pleated paper filter and secure the cleaned cover,
making sure the filter is in position. Be sure to replace the
air strainer gasket if the entire air strainer is removed from
the compressor intake.
INTAKE ADAPTER
When the engine air cleaner is replaced: Some com-
pressors are fitted with compressor intake adapters, which
allow the compressor intake to be connected to the engine
air induction system. In this case, the compressor receives
a supply of clean air from the engine air cleaner. When the
engine air filter is changed, the compressor intake adapter
should be checked. If it is loose, remove the intake adapter,
clean the strainer plate, if applicable, and replace the intake
adapter gasket, and reinstall the adapter securely. Check
line connections both at the compressor intake adapter and
at the engine. Inspect the connecting line for ruptures and
replace it if necessary.
COMPRESSOR COOLING
Every 6 months, 1,800 operating hours or after each
50,000 miles whichever occurs first, inspect the com-
pressor discharge port, inlet cavity and discharge line for
evidence of restrictions and carboning. If excessive buildup
is noted, thoroughly clean or replace the affected parts and
closely inspect the compressor cooling system. Check all
compressor coolant lines for kinks and restrictions to flow.
Minimum coolant line size is 3/8" I.D. Check coolant lines
for internal clogging from rust scale. If coolant lines appear
suspicious, check the coolant flow and compare to the tabu-
lated technical data present in the back of this manual.
Carefully inspect the air induction system for restrictions.
LUBRICATION
Every six months, 1,800 operating hours or 50,000 miles
whichever occurs first, check external oil supply and re-
turn lines, if applicable, for kinks, bends, or restrictions to
flow. Supply lines must be a minimum of 3/16" I.D. and
return lines must be a minimum of 1/2" I.D. Oil return lines
should slope as sharply as possible back to the engine
crankcase and should have as few fittings and bends as
possible. 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 currently manufactured will
pass a minimal amount of oil. Air dryers will remove the
majority of oil prior to entrance into the air brake system.
For particularly oil sensitive systems the Bendix
®
PuraGuard
®
QC
™
oil coalescing filter can be used in conjunction with a
Bendix air dryer.
If compressor oil passing is suspected, refer to the
TROUBLESHOOTING section and TABLE A for the symp-
toms and corrective action to be taken. In addition, Bendix
has developed the "Bendix Air System Inspection Cup" or
BASIC test to help substantiate suspected excessive oil
passing. The steps to be followed when using the BASIC
test are presented in APPENDIX A at the end of the
TROUBLESHOOTING section.
COMPRESSOR DRIVE
Every six months, 1,800 operating hours or 50,000 miles,
whichever occurs first, check for noisy compressor
operation, which could indicate a worn drive gear coupling,
a loose pulley or excessive internal wear. Adjust and/or
replace as necessary.
If the compressor is belt driven, check for proper belt and
pulley alignment and belt tension. Check all compressor
mounting bolts and retighten evenly if necessary. Check for
leakage and proper unloader mechanism operation. Repair
or replace parts as necessary.
Every 24 months, 7,200 operating hours, or after each
200,000 miles, perform a thorough inspection, and depend-
ing upon the results of this inspection or experience,
disassemble the compressor, clean and inspect all parts
thoroughly, replace all worn or damaged parts using only
genuine Bendix replacements or replace the compressor
with a genuine Bendix remanufactured unit.
GENERAL SERVICE CHECKS
OPERATING TESTS
Vehicles manufactured after the effective date of FMVSS
121, with the minimum required reservoir volume, must have
a compressor capable of raising air system pressure from
85-100 psi in 25 seconds or less. This test is performed
with the engine operating at maximum recommended gov-
erned speed. The vehicle manufacturer must certify this
performance on new vehicles with appropriate allowances
for air systems with greater than the minimum required
reservoir volume.
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