Slow to build pressure

[Chuck W]

Hi My MAC700 is slow to build up pressure (20 minutes to 120 psi). The previous owner said he put too much oil in it. Any idea what the problem could be? Valves?

[Glenn M.]

Had a similar problem. My Mac700 went from 0 to 120 psi in about 45 sec. (when new) to 2 min 9 seconds. (after three years of service) I brought the valve kit and replaced them (didn't bother to change the dowel pins, afraid I'd do more harm that good trying to pull them) It now goes from 0 to 120 is 1 min 12 sec. I accept the longer time (as compared to a new unit) as normal wear in the remaining parts.
Be cheaper to buy a new unit and replacing them.