BENDIX AD-9si Service Data
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BENDIX AD-9si Service Data

Oil coalescing air dryer
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®
Bendix
AD-9si
®
®
Delivery
Check Valve
Cover
OUT 21
Delivery Ports (2)
3
Governor
Exhaust
OUT 21
Delivery Ports (2)
Figure 1 – Bendix
AD-9si
®
& AD-9si
PuraGuard
®
Governor
(Governor Cut-Out
Pressure Stamped
On Cover)
Purge
Valve
Bottom
View
& AD-9si
PuraGuard
Oil Coalescing Air Dryer
®
®
®
Oil Coalescing Air Dryer
®
Desiccant
Cartridge
(PuraGuard
Oil
®
Coalescing Shown)
PT 22
Extended
Purge Port
Mounting
Holes
(3 Per Side)
Heater /
Thermostat
IN 1
Supply From
Compressor
CON 2-4
Unloader To
Compressor
Safety Valve
Purge
Valve
OE and Service New Bendix
AD-9si
& AD-9si
PG air dryers
®
®
manufactured after April 2016,
contain two parallel ribs on the
side of each port as shown
here.
These ribs identify the
air dryer and/or end cover as a
genuine Bendix
product. If the
®
OE or Service New air dryer or
end cover being serviced was
manufactured after this date and
does not contain these ribs, it is
not a genuine Bendix product.
®
1

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Summary of Contents for BENDIX AD-9si

  • Page 1 IN 1 On Cover) Purge OUT 21 Supply From Valve Delivery Ports (2) Compressor Purge Valve OE and Service New Bendix ® AD-9si & AD-9si PG air dryers ® ® manufactured after April 2016, Governor contain two parallel ribs on the...

  • Page 2: General Safety Guidelines

    Bendix ® ® ® ™ any vehicle maintenance where one or more dryer reservoir module, or a Bendix AD-9si ® ® wheels on a drive axle are lifted off the ground dryer, be sure to drain the purge reservoir.
  • Page 3 AD-9si air dryer. The AD-9si PuraGuard oil coalescing air dryer has all of Function/ Connection Quantity the same functions as the standard AD-9si air dryer and is Connection Port ID used in applications where lower oil concentration levels IN 1 Inlet Port (air in) are required.

  • Page 4: Charge Cycle

    The air dryer will remain in the charge cycle until the air the desiccant cartridge, where it flows through an oil brake system pressure builds to the governor cut-out separator – or coalescing filter if equipped with a Bendix ® setting of approximately 130 psi.

  • Page 5: Purge Cycle

    Exhaust Reservoir Purge Valve Delivery Governor Port Exhaust Figure 3 – Bendix AD-9si Air Dryer with a Governo r — Purge Cycle ® ® PURGE CYCLE (Refer to Figures 3 & 5) When air brake system pressure reaches the cut-out valve (described in the "Turbo Cut-off Feature"...
  • Page 6 The flow of dry air through the drying bed regenerates the desiccant material by removing any water vapor adhering to it. Approximately 40 seconds are required for the entire contents of the purge volume of a Bendix AD-9si ® ®...
  • Page 7 (in the closed position), air in the Bendix AD-9si air dryer when the dryer is in the purge compressor discharge line – as well as the AD-9si air dryer ® ® mode. inlet port – cannot enter the air dryer. By completing these...

  • Page 8: Preventive Maintenance

    (compressing and transmissions. See Table 2 for Bendix AD-9si air dryer non-compressing cycle) in a normal fashion. Check recommended cartridge replacement intervals for vehicles for high air system leakage.
  • Page 9 4. Build up system pressure to governor cut-out and note AIR DRYER INSPECTION that the AD-9si air dryer purges with an audible burst of 1. Visually check for physical damage, such as chafed or air, followed immediately by approximately 40 seconds broken air and electrical lines, and broken or missing of air flowing out of the purge valve.
  • Page 10 2. Reconnect the three air lines to the proper ports on the that the system once again builds to full pressure and air dryer – identified during step 3 of the Bendix AD-9si is followed by a purge at the air dryer exhaust.
  • Page 11 Governor Kit Purge Valve Assembly Purge Valve Retaining Ring Figure 7 – Bendix AD-9si Air Dryer Serviceable Components ® ® TEMPORARY AIR DRYER BYPASS To temporarily bypass the air dryer, follow these procedures (OUT 21). Using any necessary fittings, install a Tee fitting and be sure to adhere to the General Safety Guidelines in the air dryer delivery port.
  • Page 12 When the spring has been pushed to the correct location, the This procedure does not require removal of the Bendix ® check valve body is designed to hold the end of the AD-9si air dryer from the vehicle.

  • Page 13: Troubleshooting Chart

    BENDIX AD-9si AIR DRYER ® ® TROUBLESHOOTING CHART SYMPTOM CAUSE REMEDY 1. Dryer is constantly “cycling” A. Excessive system leakage. A. Test for excessive system leakage. Allowable leakage observed or purging. at dash gauge: - Single vehicle - 1 psi/minute.
  • Page 14 90 cubic inch (or larger) reservoir type). between the compressor and the AD-9si air dryer. 4. Constant exhaust of air at air A. Air dryer purge valve leaking excessively. A. With the compressor loaded, apply a soap solution on the purge dryer purge valve exhaust valve exhaust, to test for excessive leakage.
  • Page 15 10. The air dryer purge piston A. Compressor fails to “unload”. A. Check the air hose from the AD-9si air dryer control port to the c y c l e s r a p i d l y i n t h e compressor for a missing, kinked, or restricted line.
  • Page 16 Log-on and Learn from the Best On-line training that's available when you are 24/7/365. Visit brake-school.com. SD-08-2433 Rev. 003 © 2019 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 03/19 • All Rights Reserved...

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