Kubota L4760 leak down.

[Fallon]

Not sure about a hoe. My loader is rock solid & doesn't leak down in weeks. My TnT valves on the other hand...

Take a look at the clock next to the gearbox. It was cold (machine & outdoor temp). And that is after taking it to the dealer for them to fix it. I think they replaced 2 valves.

 

[MtnViewRanch]

Not sure about a hoe. My loader is rock solid & doesn't leak down in weeks. My TnT valves on the other hand...

Take a look at the clock next to the gearbox. It was cold (machine & outdoor temp). And that is after taking it to the dealer for them to fix it. I think they replaced 2 valves.View attachment 533780View attachment 533781View attachment 533782

So did they ever get you what Kubota's acceptable internal valve leakage rate is? Did they get your linkage smoothed out? :confused3:

I just don't get it, Kubota seems to have very good loader valves and not so good rear remote valves. JD is the exact opposite, their loader valves are questionable and their rear remote valves seem to be pretty good. :confused2:

 

[Fallon]

So did they ever get you what Kubota's acceptable internal valve leakage rate is? Did they get your linkage smoothed out? :confused3:

I just don't get it, Kubota seems to have very good loader valves and not so good rear remote valves. JD is the exact opposite, their loader valves are questionable and their rear remote valves seem to be pretty good. :confused2:

Nope, my dealer couldn't get that info out of Kubota last I heard. My toplink is around an inch an hour. Not great at all, but if that was it I'd just live with it. That sidelink is attrocious though & worse than before I took it in I think. That mower is heavier than my other impliments. I have it centered at the moment rather than the 1.5' offset the old Ford 917 had so it should pull on the tilt cylinder about as much.

Haven't played with the linkages to much, but they seem a fair bit better.

They moved the 3rd function hoses so they aren't hanging as low. But I'm thinking I'll still need to fab up a skid plate as that whole assembly is the lowest part of the undercarriage.

Like the machine & HST+, but any hydraulics other than the loader & 3pt are a stain on Kubota's reputation.

 

[mljenkins]

Interestingly last night the stabilizers only moved about an inch if that. The one thing I recall doing different is raising the stabilizers right before shutting off the tractor. The other night when they fell I didn’t do that, I had just parked it after using it. I guess maybe the spool was in a slightly different position between both uses.

 

[LD1]

All the way down over night dont sound great for a new machine.

But as others said, all hydraulic valves are gonna leak. Its the rate that is the concern.

And until the rate of leakage causes issues while operating.....then its not an issue IMO.

How much did you use it the first day when delivered? Perhaps there was still air in the system not fully purged out yet. And last night.....when they didnt leak down much, is because you have used it enough to get all the air out?

 

[mljenkins]

All the way down over night dont sound great for a new machine.

But as others said, all hydraulic valves are gonna leak. Its the rate that is the concern.

And until the rate of leakage causes issues while operating.....then its not an issue IMO.

How much did you use it the first day when delivered? Perhaps there was still air in the system not fully purged out yet. And last night.....when they didnt leak down much, is because you have used it enough to get all the air out?

I probably used it about 5 minutes very lightly to clean out a ditch beside my driveway the first day it came. That is a great point about the air. That makes a lot of sense. I used it yesterday for about 10 minutes and definitely cycled most of the cylinders all the way in and out when digging another small drainage ditch along the driveway just making sure things worked.

I would have figured the dealer would have tested all the functions but perhaps they didn’t cycle the functions but once quickly and called it good.

Thanks for your thoughts, I’ll keep an eye on it and see if it goes away now I have used it more. I probably used it about 3 minutes this evening just messing around so we will see.

 

[Ken Mac]

I have a Kubota B26 2015 model and it leaks down, but no where near what you first described. ai've been told what the acceptable leakage rate is, but don't remember the number. My outriggers leak about 1/2 inch per 24 hours and I can live with that. The bucket and thumb also leak about the same. The boom is locked, but leaks down against the lock after a few minutes. I'm sure someone at Kubota can find the allowable rate if they want to.

 

[Fallon]

My dealer has looked but can't get an acceptable leakdown rate for the rear spools on my L4060. Would be curious to hear any other Kubota leakdown specs if anybody has heard them.

 

[mguitas]

I place my backhoe bucket on a thick rubber pad when i'm done. I will put the bucket a inch from the pad, then turn off the pto. Let the bucket go down without power. The one day in the summer I forgot to lower it. To my surprise in 24 hours it was still a inch above the pad. My backhoe is a Wallenstein, so not all brands are the same.

 

[Ken Mac]

My dealer has looked but can't get an acceptable leakdown rate for the rear spools on my L4060. Would be curious to hear any other Kubota leakdown specs if anybody has heard them.

I will call my dealer Cahaba Tractor Tuesday and ask what is allowable, if I can remember to do it. I'll be another year older by then!