ASCO Air Purge Solenoid - Maintenance

Applies to machines built from: 
January, 2014

ASCO Air Purge Solenoid - Maintenance

If your valve does not function correctly, it is most likely because debris got inside the ASCO air purge solenoid. This procedure tells you how to clean an ASCO brand air purge solenoid.


Close the primary air valve. This stops the air supply to the machine.

Remove the red cap [1]. Push the solenoid coil assembly [2] down to compress the spring inside. Remove the specification plate [3]. Remove the split spring [4] and valve subassembly [5] from the coil assembly [2]. Disassembly the valve subassembly [5].

Clean the parts with compressed air. Be sure to remove all debris from inside the valve.

Apply a thin coat of high-grade silicone grease to the body gasket [6]. Assemble the components in the opposite order they were removed.

Open the primary air valve. Make sure there are no leaks.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.