B6000 Hydraulics.

[pcdreams]

So I got the old Kubota out today and after started, let it run for about 20 minutes to get the hydraulic moving. Used it yesterday and bout 2 hours this afternoon to plow snow. Near the end of of use the blade wouldn't lift/turn anymore and neither would the rear lift. I didn't find any leaks on the lines, cant get under it right now. However I did notice that the fluid had backflowed out the gearshift (this tractor has a shared transmission/hydro system). I'm a bit at a loss unless it's the pump. Is it possible for the fluid to freeze while it's in use? (we're not talking cold, it was 4 over night but in the 30s while I was using it).

I did drain and replace all the fluids this fall to try and be preventative of such situations.

 

[Roadworthy]

I don't think the fluid has frozen. If you've got some overflow at the transmission expect a clogged vent. As far as your hydraulics go, check the level. If it's low and you have no leaks check the engine oil level. If you lose a seal in your hydraulic pump it can put hydraulic fluid into the crankcase.

 

[Russell King]

Is there any diverter in the hydraulic system that is turned to get power to the front end or rear end of the tractor?
It may be in a poor position to operate either system by being bumped or accidentally turned.

 

[pcdreams]

I don't think the fluid has frozen. If you've got some overflow at the transmission expect a clogged vent. As far as your hydraulics go, check the level. If it's low and you have no leaks check the engine oil level. If you lose a seal in your hydraulic pump it can put hydraulic fluid into the crankcase.

Thank you. I will check this out and post back what I find

 

[pcdreams]

Is there any diverter in the hydraulic system that is turned to get power to the front end or rear end of the tractor?
It may be in a poor position to operate either system by being bumped or accidentally turned.

I'm fairly new to hydraulics, but I don't believe so. This is an old 70s model tractor. I don't have any remotes or anything like that, just a lever that lifts the arms on the back and 2 spools on the front that control up/down/left/right of blade. I don't have to flip any controls to run the lift rather than the front blade.

 

[Russell King]

Check your engine oil level also. A failed seal on the hydraulic pump will pump hydraulic fluid into the engine crankcase and have reduced functionality.

I assume that you have only the engine mounted pump and no additional add on pumps.

 

[pcdreams]

Check your engine oil level also. A failed seal on the hydraulic pump will pump hydraulic fluid into the engine crankcase and have reduced functionality.

I assume that you have only the engine mounted pump and no additional add on pumps.

correct

 

[pcdreams]

correct

So guess it's time to rehash this thread. This is the first time we've had snow enough to get the tractor out since last the initlal post.

Update since last time. I did check my fluid levels and seemed ok, though what was in the transmission case was coffee colored and a little bubbly. I parked it for the winter but used it throughout the summer and it did just fine. Changed out the fluid this fall just in case. for winter. Anyway, the fluid after using the tractor for a couple hours plowing snow has that coffee color and bubbles again.

Is the pump on this servicable or does it require a replacement? I kind of think it maybe the spool(control) valves. They are 2 lever with an up down and left right. They're sketchy in that they are wired around the lever. I'm guessing to reduce travel?
The question is how do I find a replacement? Are control valves fairly interchangable or would I need one specific to this tractor?