Massy 165 steering

I have a Massey Ferguson 165 and when I bought it they said it did not have power steering. I bought the tractor and proceeded to fix the leaks and such. I decided this winter to fix the front end sheet metal upon removing it I found it did have power steering. I have made a lot of adjustments to see if I can get it to work. When I looked it up in the book it was completely different than the book has pictured. It also has a Parker Hannifin pump on it. The steering does work to some extent but not like my 150 I posted a pic and would like more info on this set up and numbers for a rebuild kit for the cylinder and valve. Any help would be greatly appreciated. Thanks in advance.

Go to http://www.agcopartsbooks.com/PartsBooksN/login.aspx?region=NorthAmerica log on as guest user, enter the model number, hit search, look in the power steering lines and linkage section, and there it is.

Hi,
In the UK and Europe we do have a slightly different type of PAS system fitted although the principle is the same. Actuation is achieved by the amount of play between the upper and lower arms. This amount of play is used to activate the spool valve on top of the cylinder and thus supply oil to whichever side of the cylinder is required. As the system wears play will reduce the efficiency of the system.
Have an assistant rock the steering wheel back and forth in the play. In the straight ahead position there should be no play between the steering wheel and drop arm from the box. This can be adjusted to run smoothly over the 'high spot'. Wear in the drag link ends should be negligible.
Observe the operation of the connecting rod link and look for play in the rod and/or yoke ends. These can normally be drilled out and larger pins fitted.
With a little more movement on the steering wheel look at where the cylinder rod is located in the axle casting. If the rod end moves upwards first there is play there. The best way to cure this is to make a curved shim to place on top of the rod with the anchor pin going through it. Next, observe any side to side movement in the main vertical shaft bushes. If you have any play here the spool actuating movement will be lost. New bushes reamed to size after fitting and a new shaft possibly will cure this. The grub screw/s with the large nut/s form the basis for the amount of play in the system. I do not have a figure for that as we do not have that type in the UK. If the screw/s are closed down and then undone one half turn at a time (subject to the pump and filter being satisfactory)you will reach a point where you have full assistance without the tractor wandering on the road.
If there is play in the bushes, rod/pins or cylinder rod it must be eliminated.

DavidP, South Wales