Hi,
I was under the impression that I'm supposed to leave the vacume pump running for the length of the job. Yet turning zone 1 and/or zone 2 vacume switches off doesn't cut the suction, leaving me unable to unload nor load the table easily, without also turning off the engine. What may be the problem?
If your zone switches are not working I would suggest you contact our technical services 1-800-221-3865. They should be able to walk you through adjusting the valves.