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Technical Bulletin

Bulletin No: TCH-001-045-A Effective Date: 5/1/98 Cancels: PRO-01-32 dated 8/1/88 Page: 1 of 6

Subject:

Troubleshooting Compressor Oil Passing

General Comments

Some oil carryover from the air compressor into the air brake system occurs as a normal part of all air compressor

operation. Compressors require oil carry over to lubricate the compressor’s valves and rings. It is typical to find

some presence of oil at the inlet and discharge ports of the air compressor. Oil present at the exhaust of drain

valves, air dryers or aftercoolers is normal and indicates that these components are functioning properly,

removing contaminants from the system.

Vehicles equipped with a desiccant type air dryer that incorporates a filter (separator) for removing oil from the

air will normally minimize oil passed through to the reservoir. The oil collects in the air dryer with condensed

moisture and is periodically purged. Often, the routing or location of the air dryer exhaust port can amplify

concerns about oil passing, depending on where the purged oil / water mixture is expelled on the vehicle, e.g. on a

fender or onto a fuel tank. This can mistakenly be identified as “problem” oil passing, when in actuality the air

dryer and compressor are functioning properly.

Vehicles may be equipped with condensing type aftercoolers or drain valves instead of an air dryer. These devices

have little or no affect on preventing oil or water from being passed through the system and into the reservoir.

If after reviewing these general comments excessive oil passing is still suspected proceed to Step 1.

Step 1: Reservoir Draining

If excessive oil is passing from the air compressor, the air dryer filter element and desiccant may become

saturated. One of the first signs of oil saturated filter element or desiccant cartridge is moisture appearing in the

reservoirs.

The first step in determining if a compressor is passing an excessive amount of oil is to drain the reservoirs and

monitor the amount of water and/or oil removed.

Check reservoir drain valves to ensure that they are functioning properly. It is recommended that the vehicle

should be equipped with functioning automatic valves or have all reservoirs drained to zero (0) psi (0 kPa) daily

or optimally to be equipped with a desiccant type air dryer prior to the reservoir system.

If when draining the reservoirs there is an absence of water and/or oil, the compressor and all compressor support

systems are operating properly and there is no need to proceed further. If the expulsion from the dryer purge

occurs in a location such that it affects vehicle appearance, reroute the purge.

If water and/or oil are present, and the duration since the last reservoir draining is known and consistent with

Table A, go to Step 2.

If the reservoirs have not been drained according to Table A, follow the suggested frequency for two cycles. If at

the end of the second cycle, water and/or oil are drained, further investigation is needed. Proceed to Step 2.

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Technical Bulletin 1

Inhaltsverzeichnis

Seite 1 - Technical Bulletin

Technical BulletinBulletin No: TCH-001-045-A Effective Date: 5/1/98 Cancels: PRO-01-32 dated 8/1/88 Page: 1 of 6Subject:Troubleshooting Compressor O

Seite 2

An absence of water and/or oil after the second draining indicates the compressor and all compressor supportsystems are operating properly. Continue

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• Increase system maintenance through more frequent reservoir draining, dryer cartridge change out, anddischarge line replacement. Optimizing system

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contaminants). If the oil pressure is high, make necessary repairs to return the oil pressure to engine specificationand proceed to the next paragraph

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TABLE ACOMPRESSOR & AIR DRYER APPLICATION SELECTION MATRIXThis matrix is intended for use as a general guide; if you have experience with applicat

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INFORMATION SHEETIf further technical assistance is required, fill out the following information prior to contact.General InformationCompany Name:____

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