Assuming there are no external problems - possibilities are, pump drive disengaged or broken, pump broken, low hydraulic fluid level, blocked filter, relief valve stuck open, control valve stuck or broken.
First task is to ensure the pump is being driven, it has an adequate supply of fluid and it is producing sufficient hydraulic pressure...
SOURCE: massey ferguson 3655
sounds like the seals are gone on the 4wd shaft, it takes oil pressure to keep the 4wd off, but if the seals are worn the all passes through and the 4wd will not dissingage, you will need a experianced michanic
SOURCE: Operator's manual for a Massey Ferguson 65 tractor
Go to google search engine and type in your tractor most of the time it will give you lots of web sites to look at.
SOURCE: t20 massey ferguson tractor. hydralics not working
ferguson ted20 hyd arms stuck up wont drop
SOURCE: 1960 massey ferguson hydraulic filter location
Hello, I would say just go to a NAPA parts store and ask for a filter. If they have one they would show a part number for it. Usually the older tractors for Ford and Ferguson did not use filters or at best had metal filters that you cleaned in solvent and reused. There are Repair Manuals in soft-cover which are available at places like Tractor Supply or online.
The old tractor makers considered the transmission and differential sealed systems. This means like your new car today does not have a filter in the differential. The old tractors had manual transmissions and the filters are common in automatics.
Be careful not to overfill the trans because on old tractors the gear lube will go out the axle tubes and into the brakes. If operated on a slope, it is possible to tilt the axle tube and have the excess lube flow into the low side axle tube, ruining the brakes.
Some of the parts for the Ferguson will interchange with the N Series Ford. Ferguson had some Industry innovations that later were stolen by other makers.
I don't have your answer but if you google torque specs for your engine I'm sure you will find your answer. When I'm not sure I will call a dealer and they will most likely help out with the info
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