Good day Jferguson5959..
First off, I'm not a MF trained Technician..
Secondly, I own the Original MF 35 X that my parents purchased new in 1963...and have performed all maintenance..
In the late 1970's a neighbor was moving ROUND BAILS of hay on the rear lift of his 1962 MF 35.. As the tractor crossed a rough spot in his field....the TOP COVER of his Tractor split crossways and he was injured..
I would not and have refused to install new HYD PUMPS with the 2500 psi relief valve in / on Fergusons.... MF Tractors that are not equipment with the heavier top cover...
I believe this cover was from a Ferguson TO-35 that was not set up properly...as in MAX LIFT ..
All the best Bob..