Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota?

   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota?
  • Thread Starter
#11  
The easiest way to do this job is to simply remove the right rear tire. Since the tire was weighted with water and anti-freeze, this is a difficult job for one person, unless you have a way to support the tire from overhead to prevent it from falling.

The second way is harder, but doable. The seat can be removed with two knobs and two bolts. Unfortunately the seat adjustment frame is anchored from the bottom with 4 nuts. It would have been much easier if it had been anchored with bolts instead of studs pressed into the adjustment frame. They can be removed, but there is very little space and when you drop one of the nuts, you need a magnet to retrieve it. There are three brass nuts that hold the center chassis to the fenders that you have to remove, then 10 screws with large washers, and a spacer that falls out easily. Then remove about 18 skirted nuts. Spread the fenders from the center chassis and protect the paint with cardboard so the studs don't scratch the finish.

All the control knobs simply pull off except the 4 wheel engage knob and the slow/fast lever which both screw on. At this point you can easily get to the hydraulic hoses without disconnecting any wiring.

The hoses were built by a local hydraulic company and they use high quality parker hoses. The connectors are a little longer than the original Kubota connectors, but have never found out who makes the Hydraulic connectors for Kubota.

Watch how these three hydraulic hoses are connected as mine were not connected the same in the loader manual.
1) Return Line Hose is 1/2 inch and goes from the fitting on the rear axle to the lowest connector on the loader control (which is on the right side).
2) The Pump line hose is 3/8 inch and the one with the 90 degree tubing fitting (which was the hard one to get at) and goes to the inside fitting (highest). This is almost an interference fit, and you have to put the bottom (Return line) hose on first.
3) The Power Beyond hose fitting is the one that had the 45 degree tubing fitting and is also a 3/8 inch hose that goes to the fitting on the rear side of the loader control.

It took 14 years for any hoses to go bad. Now that I have replaced 8 of them, I only have 8 more to go (not counting the back hoe attachment hoses). Hope these hoses do indeed last another 14 years.
 
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   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota? #12  
I've also got an M6800 open station with a leaking hose running to the loader control valve. The dealer shop has a 4 week plus backlog so have been tackling it. I was doing ok until trying to remove the sheet metal under the seat which has the 3 ph descent control knob. That doesn't seem to unscrew (either way) or pry off using reasonable pressure. Does anyone know how that knob comes off? I really don't want to destroy the knob as it's not even showing up on the parts diagrams as far as I've been able to see.

By the way- I'm brand new to this forum but not to tractors although this is the first Kubota. Up until now, it's been a very good tractor and I can't really fuss about the hose although from what I can see so far, they could have been routed better. There are some wear and chafe points that hopefully can be alleviated when the new hose goes on.

Thanks.
 
   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota? #13  
Doesn't the workshop manual tell you how to take the seat and the other parts off? I was also going to say replace any other hoses this area gives you access to so you don't have to tear it off again.
 
   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota? #14  
Doesn't the workshop manual tell you how to take the seat and the other parts off? I was also going to say replace any other hoses this area gives you access to so you don't have to tear it off again.
Unfortunately, bought the tractor used and don't have any manual.
 
   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota? #16  
Sent you a PM.
Got it, thank you. I've scanned the document and found a reference in a couple of places. It just says to remove the knob. . . Makes sense- if I was a Kubota mechanic I would know how it comes off, lol.

I do appreciate the tips though. I suspect it is a threaded knob. If time permits tomorrow, I'll use an inspection mirror to make sure there isn't something hidden on the backside. Interestingly when the knob is turned clockwise it moves out like it's a left hand thread.

Follow up- the knob (termed descent control grip by Kubota) does pull off. Finished removing the sheet metal today and once all the dirt and debris is cleaned off will replace the lines. It's a total PITA to get to.
 
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   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota?
  • Thread Starter
#17  
Hi VAtreefarmer. Took me a few days to get back. The previous information I had written in this thread was, "All the control knobs simply pull off except the 4 wheel engage knob and the slow/fast lever which both screw on. At this point you can easily get to the hydraulic hoses without disconnecting any wiring."

Here is photo of shaft the knob goes on, Looks like it pulls off. The thing I learned from all of this is replace every single hydraulic hose when they start going bad!!! I haven't had one go bad since. Glad someone reads these old threads.
 

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   / Access to replace Hydraulic Hoses terminated under the seat of M6800 Kubota? #18  
While it gets costly, once a hose starts showing its age or fails...the rest of that vintage aren't far behind usually.
 

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