Kubota B6100 hydraulic issue

   #1  

KubotainNH

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New Hampshire, USA
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Kubota B6100
Hello, I've browsed this forum and see it has lots of good info. I recently picked up a B6100 with FEL and TPH very cheap because it has a hydraulic issue. I haven't been able to dig in to the issue yet because of the constant rain here in NH but will soon. Anywhere I should start looking? The bucket or TPH will not move up or down, the oil levels are fine. The tractor runs strong with no strange noises. I figure there is something worn or broken under the seat. Does anyone have an e-mailable diagram of the system or will a basic I&T K201 manual cover it in detail? Thanks for any thoughts, I'm itching to use this tractor. /forums/images/graemlins/smile.gif
 
   #2  

ZackaryMac

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Jun 28, 2004
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147
Location
Nova Scotia, Canada
Tractor
B6100 HST-E, T1600, Case 1818
Hi
Welcome to the forum!

The only help I can give you is to look at the lever under the seat - it is oval-shaped and has an arrow on it. This is to divert hydraulic pressure from the 3ph to anything hooked to the aux port. If this lever is pointed up, nothing will work. To the left is the 3ph, to the right is the aux port.

I hope you find your problem.
 
  
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#3  
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KubotainNH

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Ok, we got to mess around with it a little. The lever was up but moving it didn't change the issue. Without anything for weight on the 3pt it will go up but I can force it back down by hand. Also, when all the way down I can move it up and down with my hand quite easily. Is this normal? We found a fitting on the bucket that was loose and leaking. The fluid is a pretty low so we plan on topping it off and trying it again. Maybe there is a ton of air in the system and not enough fluid to push it out. We'll see soon. We also removed the return hose from the bucket controller and it was pushing fluid out of it. Any thoughts are appreciated.
 
  
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KubotainNH

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Well, I topped off the hydraulic fluid and as expected no change. I ordered a manual so I can see how the system works. There's seems to be flow, just doesn't seem to be enough pressure.
 
   #5  

wushaw

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Mar 6, 2005
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Bristol Texas
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Kubota L2800, 15 hp 372 Mitsubishi
Sounds like you don't have any hyd pressure at all. I would start with the pump first to see if it is putting out.
 
   #6  

Mith

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Nov 29, 2004
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Sounds like a leaky valve.
Fluid is rushing past the seals in the vavle back to the tank before it does anything. Best idea would be to pressure check the pump, if it is good lay into the valve
Hope this helps

PS, I have a B6000 manual if you think that will be of use to you. PM me if you want.
 
  
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KubotainNH

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Here's an update on my issue and some questions. I finally got time to mess with the little tractor. I found that the control valve for the bucket is bad in some way, possibly the relief valve. Here's how I figured this out. I ran the line that lifts the bucket straight to the block that has the pump output, it lifted as soon as I started the tractor so the pump is good. This model runs the 3ph off the power beyond part of the FEL valve so I bypassed this valve with a hose on the hydraulic block near the pump and fired it up. Now the 3ph works so obviously the only component it could be is the FEL valve. So here's my question, can the FEL lift valve be rebuilt and if so can I do it or is there a company I can send it to? I see Northern Tool has them new around $160 or so. Any advice on this would be appreciated. Thanks!
 
   #9  

JerryG

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Northwest Arkansas
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MF 1440-4 PowerShuttle
If you look at a valve from the outside it may look like a big or hard job to rebuild but there is really nothing to it. There is hardly anything to them on the inside. The worst that can happen is a person can lose the small ball bearing in the end caps, but mostly it is O-rings on the ends of the spools. Just take it a part yourself and then go to the dealers and get what parts you need. You will be surprised when you get into it. Just watch for the brgs when you take the end caps off.
 

Egon

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I had trouble with the loader controls on my Kubota B7100. Turns out it was worn out linkage on the lever.

Egon /forums/images/graemlins/grin.gif
 
  
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KubotainNH

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Kubota B6100
I did take it apart some, there wasn't many o-rings in there. Mainly on what I think is the pressure relief valve. The linkage is kinda worn but I have close to zero hydraulic pressure because of the valve assembly. Not even the 3ph will lift with any weight on it. I'll probably clean it well and look over it again. We'll see how good the local Kubota dealer is to me /forums/images/graemlins/smile.gif
 
  
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KubotainNH

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I found the issue. Once I took apart the FEL valving I noticed the pressure relief valve was stuck partially open. I freed it and had a couple hours of fun digging today. /forums/images/graemlins/laugh.gif In the spring I will probably replace all the o-rings, hydraulic fluid and need to do work on a leaky bucket cylinder. I figure I should do it all at once so there is clean fluid on the new parts. I was planning on replacing the pressure relief valve but at $270 I think I'll just watch it. Thanks for all the help and PDF files. I have a pretty good understanding of the hydraulics on this machine now.
 
   #13  

RobertN

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New Holland TC40D
One thing you might do, especially since this is a used machine and has had some issues, is change all the filters and fluids. The hydraulic fluid is easy to change, but beware there is a lot of it. While doing that, check and clean all the strainers on the hydraulic system. I wonder if this relief valve issue may be caused by gunk in the system blocking it or holding it open?

This is late in this posting, but may be worth trying in addition to what you have already done. I need to do the same; my B8200 is due for full fluid changes and an air filter.
 
  
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KubotainNH

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Thanks for the post. The relief valve was pretty clean, I think it was stuck from sitting in the same position for awhile. I figure the tractor was overloaded forcing the valve open but it was too stuck to close which made for 0 pressure. It is free now and I plan on replacing the oil and cleaning the system when the warm weather comes back. I just don't have the time to do it now and it will be really cold here soon.
 
   #15  

Chris_123

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Sep 4, 2021
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B6100
Just thought I'd share in case it helps.
I had problems with 3pl slow and weak and after much searching decided to check the hydraulic filter at the bottom of the gearbox.
Totally clogged up so did a oil change and fitted a new filter and now works perfectly and much smoother.
 

stonecoldcowboy

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Sep 19, 2021
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Bobcat610/kubotab6100e
my b6100e 3 pth only raises periodicly and when i lower it the thing wont raise up again anybody have any ideas ?
 
 
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