David Brown hydraulic pump

[stoneyone2001]

I need a hydraulic pump for a 770 David Brown. I have about a 1965 i think it's a 65 not positive. You have to high rev the engine to get it to pick up my scrape blade It has been getting weaker over the years.. If anybody know's some way to rebuild my pump or if they make a rebuild kit for it. OR where there might be a good used one or a place to but a cheap new one.. I sure would appreciate if you contact me. Thanks Michael

 

[J_J]

Do you know for sure it is the pump?

Could be cyl/piston seals.

Weak relief valve.

You should really do a flow and pressure test.

 

[stoneyone2001]

I changed the piston seal i installed a different valve body awhile back because it kept falling down as soon as it go raised up it started falling as soon as you let off the handle but it stays up now i have a gauge i need an adapter to fit it to the check port im going try that tomorrow i know it does not have enough pressure to lift!! I will let you know how much much pressure i have if i can get this gauge adapted down.....