I don’t know for sure if the information is correct but tractordata indicates the L3901 has a common rail injection system, but the 3902 has a direct injection system. If that information is correct then one should be able to determine which model it actually is.
A considerable number of New Holland smaller and mid-range utility tractors are made by LS. Same tractor except for decals. I have an LS, and when I need a parts item , I just use the New Holland parts diagrams and order the appropriate part from New Holland. The exact tractor, comparably...
Try loosing the pressure line at the front pump. If you don’t know which one that is, trace it back from the loader valve. That will let the air flow from the pump. As soon as oil starts the deep out tighten the connection and your problem should be solved. I have to do this with my older JD...
I have a John Deere 5400 with a 520 loader. The hydraulic system is working fine in every area except the 3 pt. lift arms. The arms will not raise, they were locked in the up position with the drop rate valve, but when I opened it they dropped and will not raise. I have removed the drop rate...
I have a John Deere 5400, dual remotes with a 520 loader. I bought the tractor basically as a "fire sale" deal as it was. Everything in the hydraulic system works fine with the exception of the 3 point lift arms. When I picked the tractor up, the lift arms were locked in the up position with...