Pump motor stops for 2 seconds

[stampedecarwash]

Almost every 30-40 cars one of the pumps (Bay#2) stops and then starts after 2 seconds. I have a colemanhanna super saver wand wash. the contactor in the electrical panel shuts off and then it starts after 2 seconds by itself. Is the contactor going bad? or its just a loose connection somewhere so voltage coming to the contactor get lost for a second? Where can I find the electrical diagram of this equipment. I see the parts manual online but no electrical diagram. Thanks

 

[MEP001]

The contactor's thermal overload for that bay may be set for automatic reset. I would start by making sure all nine screws for the through power are tight, and do a load check if you have a clamp-on ammeter. Make sure the pressure doesn't come way up when the trigger is released, which it will do if the Paraplate regulator is bad.