I wonder if your tractor with the cab has a loader control similar to what we have on our Kubota
M59? If so, read on....
My controls were getting sticky, and I thought that a spot of oil might help. So I went out expecting to find that like all loader controls the levers were mounted right on the body of the loader spool valve body because that's how most control valves have been made to work for the past 50 years or so. But that's not how it is on our
M59.
The
M59 control levers are right where expected.....on a heavy mounting stalk by the operator's right knee in the cab so I expected to find that the spool valve itself was right there too. At worst I expected I might have to peel back a rubber dust cover so that I could and squirt in some oil on the lever pivots.
But it turns out that the FEL spool valves aren't up by the control lever at all. Kubota actually put the control levers by the operator and then placed the spool valve body a couple of feet lower down under the floor of the tractor where it lives in a dirty, muddy environment.
That means that the control levers by the operator's knee are remotely connected down to the spool valve body through a hollow shaft full of a really crazy complex set of bellcranks and adjustable push/pull control wires. It it truly bizarre. The whole affair needs to be cleaned and lubed periodically or it is certain to bind up. That may be the problem with yours. Check the exploded view in your parts manual to see if your control levers work remotely like the M59s. If so, and you have to get in there to lube or adjust it then access isn't easy - we need to talk before you give it a go. It involves disassembling some of the HST shift levers, control switches, and the front remote hydraulic switches as well. And once you do gain access to the maze of contol wires, you may find that you need to make up some special tool to lube the more difficult push/pull cables.
WARNING: Take lots of photos and measure the adjusters before changing anything in there.
It's a mystery why Kubota did it that way. The system they use on the
M59 is light-years more difficult & expensive than a traditional FEL control setup. Plus if there is any advantage to mounting the spool valve remotely down under the tractor I can't figure out what it would be.
rScotty