A.Electric Power to the Dryer
With the ignition or engine kill switch in the ON posi- tion, check for voltage to the heater and thermostat assembly using a voltmeter or test light. Unplug the electrical connector at the air dryer and place the test leads on each of the pins of the connector with the locking latch. If there is no voltage, look for a blown fuse, broken wires, or corrosion in the vehicle wiring harness. Check to see if a good ground path exists.
B.Thermostat and Heater Operation
Note: These tests are not required except in cold weather operation.
Turn off the ignition switch and cool the thermostat and heater assembly to below 35 degrees Fahren- heit. Using an ohmmeter, check the resistance between the electrical pins in the air dryer connec- tor half. The resistance should be 1.5 to 3.0 ohms for the 12 volt heater assembly and 6.0 to 9.0 ohms for the 24 volt heater assembly.
Warm the thermostat and heater assembly to over 90 degrees Fahrenheit and again check the resis- tance. The resistance should exceed 1000 ohms. If the resistance values obtained are within the stated limits, the thermostat and heater assembly is oper- ating properly. If the resistance values obtained are outside the stated limits, replace the heater and ther- mostat assembly.
REBUILDING THE AD-IP™ AIR DRYER
GENERAL
If, after completing the routine operation and leakage tests, it has been determined that one or more components of the air dryer requires replacement or maintenance, refer to the following list to find the appropriate kit(s).
When rebuilding or replacing components of the air dryer use only genuine Bendix® parts. For ease in servicing, the
MAINTENANCE KITS AVAILABLE:
065624 | SERVICE NEW DESICCANT CARTRIDGE KIT |
This kit contains the parts necessary to change the desiccant cartridge only.
109493 ........REMANUFACTURED DESICCANT CARTRIDGE KIT
This kit contains the parts necessary to change the desiccant cartridge only.
5001247 | MOUNTING BRACKET KIT |
This kit contains the upper and lower brackets as well as the necessary hardware items to mount them.
109498 | CARTRIDGE BOLT KIT |
Contains a replacement desiccant cartridge bolt and related
5003547 | PURGE VALVE HOUSING MAINTENANCE KIT |
This kit contains the parts necessary to rebuild the purge valve housing.
800404 | PURGE VALVE REPLACEMENT KIT |
This kit contains the parts necessary to replace the purge valve.
5018313 | PURGE VALVE MAINTENANCE KIT |
This kit contains the parts necessary to replace and relubricate the purge valve
065626 .... SERVICE NEW PURGE VALVE HOUSING ASSEMBLY
Contains a service new assembly and related components to accomplish replacement.
109494 | DELIVERY CHECK VALVE MAINTENANCE KIT |
This kit contains the parts necessary to replace the delivery port check valve.
109495 | 12V HEATER & THERMOSTAT KIT |
109496 | 24V HEATER & THERMOSTAT KIT |
Each contains a replacement heater and thermostat assembly and related components required for replacement.
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following general precautions should be observed at all times.
1.Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Always wear safety glasses.
2.Stop the engine and remove ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components.
3.Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.
4.If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from
7
