Bendix Commercial Vehicle Systems TU-FLO 750 COMPRESSOR 6/08 - Manual (Page 7)

7
DRY ELEMENT - PLEATED PAPER STRAINER
Every two months, 800 operating hours or 20,000 miles
whichever occurs fi rst, loosen the spring clip from the
unhinged side of the mounting baffl e and open the cover.
Replace the pleated paper fi lter and secure the cleaned
cover, making sure the fi lter 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 compres-
sors are fi tted 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 fi lter 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 fi rst, 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 fl ow.
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 fl ow and compare to the
tabulated 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 fi rst, check external oil supply
and return lines, if applicable, for kinks, bends, or restric-
tions to fl ow. 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 fi ttings 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 fi lter 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
symptoms and corrective action to be taken. In addition,
Bendix has developed the "Bendix Air System Inspection
Cup" or BASIC test to help substantiate suspected exces-
sive 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 fi rst, 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
depending 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
governed 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.