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IMPORTANT:Review the warranty policy before performing any intrusive maintenance procedures. Any warranty may be voided if intrusive maintenance is performed during this period.

WARNING!Always wear proper safety equipment, including but not limited to eye protection. Do not inject alcohol, antifreeze, or other de-icing substances into or upstream of the air dryer. Alcohol is removed by the dryer, but reduces the effectiveness of the device to dry air. Use of other substances can damage the air dryer and MAY VOID THE WARRANTY*.

READ AND FOLLOW ALL INSTRUCTIONS TO AVOID DAMAGE, PERSONAL INJURY OR DEATH!

REPLACING OTR AIR DRYERS

Inlet (supply)

Outlet (delivery)

Control (from governor)

Heater connector

Photos are for illustrative purposes only; actual product may vary depending on the model purchased.

REMOVAL1. Park on a flat surface, stop engine, block wheels, and drain air tanks.2. Deactivate electrical system following truck manufacturer’s

recommended procedures, as you may need to replace the wiring harness to the air dryer heater.

3. Verify there is a constant downward angle of the inlet line from air compressor to air dryer. If there are kinks or sags, reroute. Total inlet line length from compressor to dryer should be a minimum of 7 feet and a maximum of 19 feet. NOTE: During operation, inlet air temperature at the dryer should be less that 170 °F.

4. Double-check that there is zero pressure at:a. inlet line (supply) at air dryer. Disconnect.b. outlet line (delivery) at air dryer. Disconnect.c. control line (from governor) at air dryer. Disconnect.

5. Replace air governor.6. Disconnect harness to heater at air dryer. Reminder: The new dryer is

for a 12 V system.7. Double-check the ground lead of the heater harness is NOT connected

to the dryer, and IS connected to the frame rail (chassis ground).8. Air dryer should be completely disconnected. Remove top mounting

strap and replace if needed.9. Dismount old unit and remount new dryer.

* See warranty documentation included with your OTR Air Dryer.

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© 2020 FleetPride, Inc. 1227 5/20FLEETPRIDE.COM • 800.967.6206

INSTALLATION1. Reconnect outlet line, inlet line and unloader line. If

using Teflon™ tape on threads, be careful pieces do not break off into air system.

2. Double check electrical system is de-activated. Inspect wiring harness to heater for any damage to wires or connector and replace if needed. Always use shrink tubing at your new wire connections. Reconnect harness to dryer.

3. Replace both one-way check valves located at the primary and secondary tank. If a Holset compressor, the check valve setup is different prior to the supply reservoir.

4. Check for an alcohol injector. It will be located between the dryer and the supply reservoir (not required). If there is one, replace or remove filler cap, disassemble clean, reassemble and refill with APPROVED airline antifreeze only.

5. Close all drain cocks and re-activate electrical system per manufacturer’s recommended practice. Verify there is power to the air dryer heater.

6. Start engine and wait for air system to reach full pressure. Dryer should purge for approximately ±20-25 seconds after governor cut off.

7. Repeatedly apply brakes until system pressure drops enough for the compressor to cut in. Dryer should purge again for approximately ±20-25 seconds after governor cut-out.

8. With air system fully pressurized, stop engine. Apply soap and water solution to EVERY air connection you worked to insure no leaks exist.

9. Remove wheel chocks.

GOOD JOB!

PARTS LIST*TYPE DRYER CARTRIDGE PURGE VALVE GOVERNOR HARNESS

AD-9® OTR065225OTR109685 OTR107794 or OTR107794PGX OTR5005037 or OTR800405 OTR275491 AV109869

AD-IS®/SP® OTR801266 OTR5008414 OTR109995 OTR5004045AD-IP® OTR065612 OTR065624 or OTR109493PGX OTR022105 OTR5004049 OTR109495

SS-1200 OTR955205OTR955300 OTR950011 or OTR950068 OTR950014 or OTR950013

REPLACING OTR AIR DRYERS

WARRANTY2-year 120,000-mile warranty on part only. This limited warranty does not cover defects or damage caused by abuse, misuse, road debris, accidents or improper installation, maintenance or service.

NOTE:The replacement of air dryer cartridges is considered normal maintenance and is not covered under the warranty.

*Denotes application of a California Prop 65 warning as follows: WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov