John Deere 750-loader bucket works but lift will not

[Dick D]

I installed a new pump,and all was well. Both bucket and lift worked at first then when I tried to use my box scrape it lowered and will not lift, the loader bucket will work.

 

[JasG]

If you go to Deere parts and look up your model. You should be able to find a break down of your tractor. It is very possible you have air some where in your system. Hopefully looking at different breaks downs of your tractor you can see where the oil flows up to the rockshaft and related valve.

 

[Tx Jim]

Did all hyd plumbing remain the same when pump was exchanged IE all hoses are attached as originally? Have you looked to be sure 3 pt control linkage is attached correctly?