System Leakage; Reservoir Draining (System Without Air Dryer); Alcohol Evaporator Or Injector Systems; Air Dryers - BENDIX TU-FLO 550 COMPRESSOR Manual

Bulletin No.: TCH-008-021
Page: 2 of 2
High Duty Cycle Vehicles (City Transit Coaches, Refuse Haulers, Etc.)
The maximum discharge line length is 16 feet.
Length
10-16 ft. ½ in.
If the discharge line length must be less than 10 feet or greater than 16 feet, contact your local Bendix
representative.

System Leakage

Check the air brake system for excessive air leakage using the Bendix "Dual System Air Brake Test and Check
List" (BW1279). Excessive system leakage causes the compressor to "pump" more air and also more moisture
into the brake system.

Reservoir Draining (System Without Air Dryer)

Routine reservoir draining is the most BASIC
of freeze-up. All reservoirs in a brake system can accumulate water and other contamination and must be
drained! The best practice is to drain all reservoirs daily. When draining reservoirs; turn the ENGINE OFF and
drain ALL AIR from the reservoir, better still, open the drain cocks on all reservoirs and leave them open over
night to assure all contamination is drained (reference Service Data Sheet SD-04-400 for Bendix Reservoirs).
If automatic drain valves are installed, check their operation before the weather turns cold (reference Service
Data Sheet SD-03-2501 for Bendix
for daily reservoir draining is eliminated through the use of an automatic drain valve, periodic manual draining
is still required.

Alcohol Evaporator or Injector Systems

Check for proper operation of these systems by monitoring alcohol consumption for a few days (Reference
Service Data Sheet SD-08-2301 for the Bendix Alcohol Evaporator). Too little means the system is not receiving
adequate protection and too much simply wastes alcohol. As a general guide, these systems should consume
approximately 1 to 2 ounces of alcohol per hour of compressor loaded time (compressing air). City pick-up
and delivery vehicles will operate with the compressors loaded (compressing air) more while compressors on
highway vehicles will be loaded less. These fi gures are approximate and assume that air system leakage is
within the limits of the Bendix "Dual System Air Brake Test and Check List" (BW1279). Last but not least, begin
using alcohol several weeks prior to freezing weather to ensure that the system is completely protected. Use
only methanol alcohol, such as Bendix "Air Guard", in evaporators or injectors.

Air Dryers

Make certain air brake system leakage is within the limits stated in BW1279. Check the operation and function
of the air dryer using the appropriate Service Data Sheet for the air dryer.
AD-9 ™ Air Dryer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2412
™
AD-4 Air Dryer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2407
AD-2 ™ Air Dryer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2403
™
AD-IP Air Dryer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2414
AD-SP ™ Air Dryer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2415
Trailer System-Guard
®
Bendix PuraGuard QC
A-20
Appendix C: Continued
Effective Date: 11/1/92
I.D. min. Other Requirements
None
™
step (although not completely effective) in reducing the possibility
® DV-2 ™ Automatic Drain Valves). It should be noted that, while the need
® Air Dryer. . . . . . . . . . . . . . . . . . . . . . Service Data Sheet SD-08-2416
™
Oil Coalescing Filter. . . . . . . . . . . Service Data Sheet SD-08-187B