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  • Bendix AD-9 Air Dryers

Bendix AD-9 Air Dryers

  • AD-9 Service Data Sheet with installation instructions
  • How the AD-9 air dryer works
  • Troubleshooting the Bendix AD-9 air dryer

Bendix AD-9 Repair Kits Bendix AD-9 Repair Kits
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  • 12 /
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1 2 3 … 5
Bendix Remanufactured AD-9 Air Dryer, 1/2" NPT, 24-Volt (No Core Charge)

Bendix Remanufactured AD-9 Air Dryer, 1/2" NPT, 24-Volt (No Core Charge)

Part# 061-10968524V Free Shipping

$458.57 USD Not Yet Rated

Genuine Bendix 065225 12-Volt AD-9 Air Dryer with Mounting Bracket Kit (No Wire Harness)

Genuine Bendix 065225 12-Volt AD-9 Air Dryer with Mounting Bracket Kit (No Wire Harness)

Part# 060-065225 Free Shipping

$446.95 USD

1
Ratings Snapshot
5
out of 5
Would recommend this product.

PTP GN065225 Aftermarket 12-Volt AD-9 Air Dryer with Mounting Bracket Kit

PTP GN065225 Aftermarket 12-Volt AD-9 Air Dryer with Mounting Bracket Kit

Part# 322-GN065225 Free Shipping

$199.92 USD

2
Ratings Snapshot
5
out of 5
Would recommend this product.

Aftermarket 24-Volt AD-9 Air Dryer with Mounting Bracket

Aftermarket 24-Volt AD-9 Air Dryer with Mounting Bracket

Part# 322-GN06522524V Free Shipping

$269.00 USD Not Yet Rated

PTP GN109685 Aftermarket 12-Volt AD-9 Air Dryer, No Mounting Bracket or Wire Harness

PTP GN109685 Aftermarket 12-Volt AD-9 Air Dryer, No Mounting Bracket or Wire Harness

Part# 322-GN109685 Free Shipping

$169.95 USD

1
Ratings Snapshot
5
out of 5
Would recommend this product.

Aftermarket 24-Volt AD-9 Air Dryer, No Mounting Bracket or Wire Harness

Aftermarket 24-Volt AD-9 Air Dryer, No Mounting Bracket or Wire Harness

Part# 322-GN109685-24V Free Shipping

$252.24 USD Not Yet Rated

Bendix 065225PG AD-9 Air Dryer with PuraGuard Desiccant Cartridge, 1/2" NPT, 12V 75W

Bendix 065225PG AD-9 Air Dryer with PuraGuard Desiccant Cartridge, 1/2" NPT, 12V 75W

Part# 060-065225PG Free Shipping

$571.23 USD Not Yet Rated

Bendix 065226 AD-9 Air Dryer, 3/4" NPT, 12V 75W

Bendix 065226 AD-9 Air Dryer, 3/4" NPT, 12V 75W

Part# 060-065226 Free Shipping

$731.56 USD Not Yet Rated

Bendix 065224 AD-9 Air Dryer (Special Order)

Bendix 065224 AD-9 Air Dryer (Special Order)

Part# 060-065224 Free Shipping

$722.56 USD Not Yet Rated

Bendix 065227 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 24V (Special Order)

Bendix 065227 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 24V (Special Order)

Part# 060-065227 Free Shipping

$742.02 USD Not Yet Rated

Bendix 065228 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 12V (Special Order)

Bendix 065228 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 12V (Special Order)

Part# 060-065228 Free Shipping

$742.02 USD Not Yet Rated

Bendix 065243 AD-9EP Extended Purge Air Dryer, 1/2" NPT, 12V

Bendix 065243 AD-9EP Extended Purge Air Dryer, 1/2" NPT, 12V

Part# 060-065243 Free Shipping

$742.02 USD Not Yet Rated

1 2 3 … 5

Extended Maintenance Intervals

Bendix AD-9 air dryers have a large capacity desiccant cartridge that allows for longer maintenance intervals. Air dryer rebuilds can be stretched to every 36 months when the AD-9 is installed on a typical over-the-road truck or tractor.

Easy To Service

Desiccant cartridge replacement is the only reason to ever completely disassemble the Bendix AD-9 air dryer. The check valve, turbo cut-off valve, heater, and purge valve assembly can all be serviced without disassembling the air dryer.

Troubleshooting the Bendix AD-9 Air Dryer

Bendix AD-9 Air Brake Air Dryer

This troubleshooting documentation was compiled from Bendix's AD-9 Service Data Sheet. Download the data sheet for more detailed information.

Dryer is constantly "cycling" or purging. Dryer purges frequently (every 4 minutes or less while vehicle is idling)
Excessive system leakage IMPORTANT: Note whether air pressure loss is shown on dash gauge(s). Pressure loss shown on gauges is caused by service brake system or component leakage. Pressure loss NOT SHOWN on gauges is caused by supply system or component leakage.
Leaking purge valve housing assembly and/or O-rings in air dryer end cover.
Holset® "E" type compressor - When installing a Bendix Drop-In air dryer in a system equipped with a Holset E or QE compressor, remove the Holset ECON valve along with its feedback and governor control line.
Water and/or Oil in Supply or Service Reservoir
Desiccant cartridge needs to be replaced
Improper discharge line length or line material - Maximum air dryer inlet temperature is exceeded.
Air system charged from outside air source (outside air not passing through air dryer)
Air dryer not purging
Purge (air exhaust) time insufficient due to excessive system leakage
Excessive air usage, duty cycle too high
Compressor malfunction - Passing oil
Air bypasses desiccant cartridge assembly - If vehicle has a Holset compressor, inspect feedback check valve.
Oil present at air dryer purge exhaust or cartridge during maintenance
A small amount of oil in these areas is normal.
Safety valve on air dryer "popping off" or exhausting air
Restriction between air dryer and supply reservoir
Air dryer safety valve malfunction
Desiccant cartridge needs to be replaced
Governor malfunction. Missing or restricted governor control line installation
Constant exhaust of air at air dryer purge valve exhaust when air dryer is in Charge mode.
Air dryer purge valve leaking excessively
Compressor fails to unload (stop compressing air) and air dryer purge exhaust makes "sputtering" or "popping" sound
Purge control line connected to reservoir or exhaust port of governor. It must be connected to an unloader port on the governor.
Purge valve frozen open - malfunctioning heater and thermostat, wiring, blown fuse.
Excessive system leakage
Purge valve stays open - supply air leaks to control side - Replace purge valve and housing
Can not build system air pressure
Inlet and outlet air connections reversed
Check valve between air dryer and first reservoir malfunctioning
Kinked or blocked discharge line
Excessive bends in air compressor discharge line causing water to collect and freeze
Governor malfunction
Air dryer does not purge or exhaust air
Missing, broken, kinked, frozen, plugged or disconnected purge control line
Faulty air dryer purge valve
Air dryer safety valve malfunction
Desiccant material being expelled from air dryer purge valve exhaust
Air dryer not securely mounted. (Excessive vibration.)
Malfunctioning or saturated desiccant cartridge
Compressor passing excessive amount of oil
Desiccant cartridge not assembled properly to end cover. (Loose attachment)
"Pinging" noise excessive during compressor loaded cycle
Defective check valve assembly in air dryer end cover.
Leaking purge valve control piston o-ring.
Constant leaking of air at air dryer purge valve exhaust (non-charging mode.)
Defective check valve assembly in air dryer end cover.
Leaking purge valve control piston o-ring.
The air dryer purge piston cycles rapidly in the compressor unloaded (non-compressing) mode.
Compressor fails to "unload"
Typical Bendix AD-9 Plumbing Diagram

Typical Bendix AD-9 Plumbing Diagram

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