How often should air dryer purge?
Air Tanks and Purge Valves A second simple step toward keeping the air system moisture-free in winter is manually draining the air tanks – periodically, based on the truck’s air usage. Up to once a month for vehicles with high air demand or every three months for a typical line haul truck is recommended.
What causes an air dryer to keep popping off?
Check for air leaks in the line between the air governor and the drier pop off valve. This should be the center tap in the governor. if it is an ad-9 drier and it leaks through the purge valve after its initial main purge and doesn’t stop till it is back on the build cycle check the check valve in the discharge port.
Is there continuous air leak from air dryer purge valve?
After the system purges, there is a slow but steady air leak from the purge valve. Shut the truck off and it still leaks. It will loose down to 60 psi in about 45 minutes, and is completly depleted in about 1.5 hours. I change the purge valve, but that didn’t help. Can anyone give me some ideas on a remedy for this? I sure would appreciate it.
Why does my Bendix air dryer keep purging?
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.
Is there a troubleshooting guide for an air dryer?
*This guide is only for vehicles that use desiccant air dryers. The guide consists of an introduction to air brake charging system components, a table showing recommended vehicle maintenance schedules, and a troubleshooting symptom and remedy section with tests to diagnose most charging system problems.
How does the air dryer purge piston work?
The air dryer purge piston cycles rapidly in the compressor unloaded (non-compressing) mode. Before placing the vehicle in service, perform the following tests: 1.Close all reservoir drain cocks. of air. to full pressure and is followed by a purge at the AD-9 air dryer exhaust. 4.