The MPH II I take care of oscillates as it runs up. I can hear in the motor rpm, and feel in the ride, a small variance in speed during the entire course of flight. Any thoughts as to whether the motor or the pump is going bad? Wondering if those units have any track record of such occurrances.

-- S M (scal@usa.com), January 05, 2005

Answers

how long has job been running ? have you had a valve or pump replacement lately ? reason i ask is i have one doing it also ...

-- Will (mtnrambo@msn.com), January 05, 2005.

Job has been in for a few years, (don't know exact date of installation) and to my knowledge neither motor, nor pump has been changed out.

-- SM (scal@usa.com), January 06, 2005.

Two possible problem could contribute to this. First I've seen it happen when the solid state line starter began to go bad ie.. the SCR's beginning to take a crap, second if it's a submersible you may have a key problem where the motor meets the pump, may worn, sized wrong etc... or a possible muffler problem. Some units have an air bladder type muffler made by MEI in Minnesota and if the blader goes bad you get pressure changes in the confined chaber of the bladder. Also look for the obvious like blocked screens, air intake in the tank changing with the level of oil in the tank. I've had a dozen or more on my route for years they are great units.

-- George (longshaft@aol.com), January 06, 2005.

Check to see if the piston is dry (not carrying any oil). If so the single ring packing may be your problem. A quick, temporary fix is to put "Slick 50" on the piston as you "access" it up. Then give it a try. We had such a problem with tight packing, which generates a lot of heat, that we had to install sanding collars and large catch rings around the jack which we used as reservoirs for the "slick 50" Good luck, Hat

-- Hat (slideheadfirst@cox.net), January 10, 2005.

Try MAXGLIDE a product of Maxton. Its a great hydro additive that helps reduce heat and sticky jacks.

-- Jerome Ramirez (jeromeramirez@hotmail.com), January 24, 2005.