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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

™

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.

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