How often should the air dryer purge?
Up to once a month for vehicles with high air demand or every three months for a typical line haul truck is recommended.
What makes a air dryer purge?
The purge cycle of the air dryer begins when the governor causes the compressor to unload (stop compressing air). During compressor unload, the line connecting the governor unloader port to the AD-9 air dryer end cover control port is pressurized. The air pressure causes the air dryer purge valve to open.
Can you adjust an air Governor?
To raise the pressure settings, turn the adjusting screw counter-clockwise. To lower the pressure settings, turn the adjusting screw clockwise. Note: Be careful not to over adjust. Each 1/4 turn of the adjusting screw raises or lowers the pressure setting approximately 4 psi.
What causes a purge valve to stick?
If the computer is saying that the purge valve is stuck open it is usually because there is an EVAP leak in the system. If the purge valve is new I usually check the wiring and the signal going to the valve to make sure it is not shorted keeping the valve open.
How do I know if my air dryer purge valve is bad?
Purge Valve Issues and Replacement
- Air leakage or lack of pressure building due to purge valve seal wear.
- “Popping” of the purge valve due to intermittent sticking.
- Loss of engine turbocharger boost during the purge cycle due to leakage in the.
- turbo cutoff valve.
How do I adjust the governor on my air dryer?
How do I turn up my air governor?
How does a Bendix AD 9 air dryer work?
The function of the AD-9™ air dryer is to collect and remove air system contaminants in solid, liquid and vapor form before they enter the brake system. It provides clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs.
What tells the purge valve to open?
Most other systems use the vent valve to control system pressure. The system does not allow the Purge Valve to open until the engine coolant temperature reaches 74C, at which time the purge valve opens and allows manifold vacuum into the vapour chamber of the canister.
How does the purge cycle work on an AD-9 air dryer?
The purge cycle of the air dryer begins when the governor causes the compressor to unload (stop compressing air). During compressor unload, the line connecting the governor unloader port to the AD-9 air dryer end cover control port is pressurized.
Why is my air dryer not purging properly?
1 Desiccant cartridge needs to be replaced 2 Improper discharge line length or line material – Maximum air dryer inlet temperature is exceeded. 3 Air system charged from outside air source (outside air not passing through air dryer) 4 Air dryer not purging 5 Purge (air exhaust) time insufficient due to excessive system leakage
How does the Bendix AD-9 air dryer work?
The Bendix AD-9 air dryer alternates between two modes or “cycles” during use, the charge cycle and the purge cycle. Both cycles play an important part in keeping your air tanks as clean as possible. With an AD-9 air dryer installed, contaminants enter the supply port of the air dryer end cover.
How often should I rebuild my AD-9 air dryer?
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. Desiccant cartridge replacement is the only reason to ever completely disassemble the Bendix AD9 air dryer.