AD-IP™ AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS | CAUSE | REMEDY |
1. Dryer is constantly |
| 1. Test fittings, hoses, lines and connections. |
| Apply soap solution to detect excessive | |
“cycling” or purging. |
| |
| leakage. Tighten or replace as needed then | |
Dryer purges frequently |
| |
| repeat the air dryer | |
(every 4 minutes or less |
| |
| observe the gauge installed in the supply | |
while vehicle is idling) |
| |
| reservoir. If leakage is within limits remove gauge | |
(continued). |
| |
| from reservoir and replace drain cock or valve. If | |
|
| excessive leakage is detected, continue testing. |
|
| 2. Test accessories connected to supply reservoir. |
|
| Drain all air pressure from system, disconnect |
|
| all air lines leading to accessories (fan clutch, |
|
| wipers, air seats, etc.) and plug the reservoir at |
|
| disconnection point. Build air system pressure |
|
| until air dryer purges and observe supply |
|
| reservoir gauge. If leakage is no longer |
|
| excessive, repair or replace leaking accessory. If |
|
| excessive leakage is detected, continue testing. |
|
| 3. Test governor leakage. Build system pressure to |
|
| governor |
|
| solution to governor exhaust port and around |
|
| cap. Leakage should not exceed a 1 in. bubble |
|
| in 5 seconds. Reduce system pressure to 80 psi |
|
| or less, and |
|
| should not exceed a 1 in. bubble in 5 seconds. If |
|
| excessive leakage is detected in either test, |
|
| repair or replace governor. |
|
| 4. Test compressor unloader leakage. Drain all air |
|
| pressure from system and remove the governor |
|
| from the compressor. Temporarily plug the |
|
| governor unloader port or air line that mated with, |
|
| or connected to, the compressor. Build air |
|
| system pressure until air dryer purges then |
|
| IMMEDIATELY SHUT OFF THE ENGINE. |
|
| Observe the air gauge in the supply reservoir. If |
|
| leakage is within limits, replace the compressor |
|
| unloaders. |
|
| compressor (after removing plug installed in |
|
| governor) and retest while observing supply |
|
| reservoir gauge. If excessive leakage is |
|
| detected, continue testing. |
|
| 5. Test air dryer purge valve and outlet (delivery) |
|
| check valve. Drain all air pressure from system, |
|
| remove the control line connection at the air |
|
| dryer and plug the end of the air line leading to |
|
| the governor (not the air dryer control port). Build |
|
| system pressure to governor |
|
| air gauge. If little or no pressure drop is observed |
|
| replace the air dryer check valve. If pressure |
|
| drop continues, apply soap solution to air dryer |
|
| purge exhaust and purge control port (where the |
|
| control line was removed). Leakage should not |
|
| exceed a 1 in. bubble in 5 seconds. If leakage is |
|
| excessive repair or replace purge valve |
|
| assembly. |
|
|
|
17
