MF 65 Hydraulic Pump

In the end, all is well. It turns free and looks like it did when I started, just cleaner. I am still trying to figure out what all the rest of those O-rings are for. I used 10 in between the chambers, 3 in the control valve, but I have many left over. Even some teflon spiral jobbies.

Still can't figure out what the oscillator is for. Far as I can tell it moves the control valve spring seat back and forth. What does that accomplish? It is really good at getting in the way of the piston. Healing in WV Aaron

PS Watch those piston rings, they seperate tissue like a scalpel.

The cat then eat it by itself and most of the time with enthusiasm and joy.

:-) Bill

Congratulations on your pump rebuild. It is quite a learning experience. Hopefully it will work well.

There are many "extra" O-rings in your kit. some are for the lift cover, PTO, etc. The small sprial rings are back-up washers for each end of the stand pipe. One should be inside of each stand pipe O-ring.

As to the piston/oscillator linkage interference, I could find no arrangement that would eliminate the interference and I chalk this up to a redesign without follow up to assure that the redesigned parts would work properly. I relieved mine with a die grinder also.

For what it's worth, the rebuilt pump in my 35 works great.

Dean