Why will Farmall Super C hydraulics not go down under load?

Answer 1

The Farmall Touch-control hydraulic unit has two rocker arms which are operated by two internal hydraulic cylinders, each of which has its own check valves (each cylinder has two-one in each direction) and its own spool valve. The two cylinders share a pressure relief system consisting of two valves and an orifice plug with an integral screen. The tractors usually came equipped without remote hydraulics, but these were available as special equipment or as aftermarket units. I presume you are speaking of the rocker arms. If the linkages are all intact on the pistons and the spool valves on the front of the unit, and if they are not binding, you have a problem with either of the spool valves or with one or more of the check valves. Most likely, the entire unit will have to be disassembled, cleaned, the broken or defective parts repaired or replaced, and new o-rings and gaskets installed. The unit looks complex in exploded views, but it is actually very simple. The key is that you keep very close tabs on where each part goes, and put it back where it came from. You must also be impeccably clean, completely clean out the unit, and keep dirt out of it as you reassemble it. I recommend taking digital photos as you take it apart so you can refer to them later. Binder Books sells repair manuals for these tractors, and they are exceptionally well-printed. They also sell a touch-control service manual. Visit them at http://www.binderbooks.com/