Posted by: Alton on October 19, 2003 at 10:15:47:

In Reply to: Montgomery Airless Paint Sprayer Posted by: Curt Thuneman on January 08, 2002 at 13:52:13:

My airless will not pick up a prime but the diaphram seems to be in good order, the steel ball is free. Any other suggestions?

Try the in let and outlet valves ...but also anytime you break the head off to check the diaphram you must always bleed off the hydraulics before using again. Basically in a diaphram pump you have the balls, the diaphram and inlet outlet valve. Also the pressure switch can be bad.