BENDIX AD-9si Service Data - Page 8

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PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended

warranty may be voided if intrusive maintenance is

performed during this period. Purge valve and governor

maintenance is permissible during the warranty period

only when using a genuine Bendix

kit or governor kit.

Because no two vehicles operate under identical

conditions, maintenance and maintenance intervals will

vary. Experience is a valuable guide in determining the

best maintenance interval for any one particular operation.

RESERVOIR DRAINING

Per the guidelines shown in Table 2, check for moisture in

the air brake system by opening reservoir drain valves and

checking for the presence of water. If moisture is present,

the desiccant cartridge may require replacement; however,

the following conditions can also cause water accumulation

and should be considered before replacing the desiccant:

1. An outside air source has been used to charge the

system. This air did not pass through the drying bed.

2. Air usage is exceptionally high and not normal for a

highway vehicle.

This may be due to accessory air demands or some

unusual air requirement that does not allow the

compressor to load and unload (compressing and

non-compressing cycle) in a normal fashion. Check

for high air system leakage. If the vehicle vocation

has changed, it may be necessary to upgrade the

compressor size. Refer to Bendix Specification

BW-100-A / Appendix D, to determine if any changes

are necessary. Specification BW-100-A is available

from the Bendix TechTeam at 1-800-247-2725 or

bendix.com.

3. The location of the air dryer and reservoir system

is too close to the air compressor. Refer to Bendix

Specification BW-110-A / Appendix B, for discharge line

lengths.

Recommended Service Intervals for Bendix

Air

Typical Vehicle

Usage

Vocation

Line haul, city,

Standard

delivery

Double trailers,

Medium

light transit, light

off-highway

Multiple trailers,

High

city transit, heavy

duty off-road

*Always follow the truck manufacturer's published service recommendations as they may require more frequent services.

Table 2 – Service Intervals

AD-9si

purge valve

Reservoir Drain Interval

(whichever comes first)

Axles

Hours Mileage

5 or less

900

25,000 3 months

8 or less

450

12,000 2 months

11 or

300

6,000

1 month

less

Figure 6 – Heater and Thermostat Connector

4. In areas where more than a 30 degree range of

temperature occurs in one day, small amounts of water

can temporarily accumulate in the air brake system due

to condensation. Under these conditions, the presence

of small amounts of moisture is normal.

CARTRIDGE REPLACEMENT

Adhering to a preventive maintenance schedule is crucial to

keeping a vehicle's air system clean and ensuring superior

performance of all components that utilize system air – such

as brakes, emissions equipment, and automated manual

transmissions. See Table 2 for Bendix AD-9si air dryer

recommended cartridge replacement intervals for vehicles

equipped with a Bendix

More frequent intervals may be required depending

on a vehicle's age, its compressor condition, use of a

non-Bendix compressor, the operating environment,

the vehicle's vocation, and its usage. In conjunction

with these guidelines, fleets can determine the

functionality of their filters by checking for moisture in

the air brake system monthly. If moisture is present,

the air dryer cartridge may require replacement.

Air Dryers

Bendix

Standard

Cartridge

Time

Replacement

AD-9

24 months

18 months

12 months

Heater & Thermostat

Connector

compressor.

PuraGuard

Oil Coalescing

Cartridge Replacement*

AD-9si

AD-IP

AD-IS

AD-SP

24 months or 200,000 miles

18 months or 150,000 miles

12 months

Bendix

™

Green Cartridge

Replacement

12 months

6 months