Kubota Help?

[Jon Hallmark]

First, thanks for taking the time to respond. Let me clarify a couple of points.

Kubota is just giving me a quote to make the repairs.

Yes, the first line ruptured while I was working the tractor, the second one ruptured while the tractor was idleing, so something is going on to spike the pressure and I don't know enought about hydraulics to have a different theory than a clogged bypass. It sure seems like the pressure side of the line should be filtered, and the filter should catch the pieces of trash.

It sounds like a combination of technique that places less stress on the hydraulics and FEL are in order.

 

[Jon Hallmark]

How does this sound?
Pull the cylinders off and inspect to see if they are actually bad. JJ has a point, nothing external shows one went bad. There is no bend or leaks at the cylinder. With that in mind, I suppose I should not assume Kubota's tech is correct. Based on what I find there, I guess I should just start disassembling, cleaning and inspecting. Thoughts?

 

[J_J]

If all hyd valve levers were in neutral, the hyd fluid would just flow through all the valves.

If a relief is clogged and you cause the pressure to rise above the set relief pressure, then the pressure will rise enough to cause the weakest component to fail.

Remove the relief valve for the FEL and check/clean.

You can check your cyl by forcing the piston to the end of the extend stroke, remove the rod end hose and push the lever to more extend, and see of any fluid is coming out the rod end port. If it is, then the cyl seals are bypassing of leaking.

If you cap the other cyl hoses, you can check each cyl in the circuit.

Repeat test for other cyl.

A hyd gage is your friend.

 

[cmore]

John, just wondering what they found wrong?

 

[Jon Hallmark]

John, just wondering what they found wrong?

One of the bucket cylinders had pulled the nut off that held the piston on the end. Then a piece of the trash clogged up the bypass causing the pressure to spike and as JJ said, was causing the weakest link to fail until it was cleaned out.

FYI, when I had Kubota give me a quote it was to repair this malfunction, change the hydraulic oil, and change the motor oil. Their quote was $3,800 and some change.

I purchased 2 new cylinders from Baileys along with bushings to create the proper pin size, 2 new hoses from my local auto parts and changed the hydraulic oil, motor oil, and all of the filters for just over $675.00, with 1 afternoon of gathering stuff, and 1 afternoon of installing the parts.

Baileys bucket cylinders $96.00 each side, Kubota wanted $700 plus, and their quote only included 1 replacement.
hydraulic hoses and fittings $104 each side, the bailies cylinders had a different hydraulic port location causing my hoses to be too short.
Filter kit from ebay $140
Carquest Kubota UBT equal $45 per 5 gallon pail.

It works as good as new.

I cannot believe the markup they wanted to charge. When I buy my next tractor, I'm going to research the dealers service costs better!

 

[J_J]

Jon Hallmark,

Glad you took care of the problem your self.

Did you remember to Loctite the nut on the piston.