Kubota L5030 (no Hyd functions)

[johnpawl]

First post here. Thank you for hearing me out.

My friends owns a L5030 that's out in the field right now.. I'm looking for some basic knowledge / info on this tractor before I head out there to tackle the job.
I have the service manual and I'm also a Mechanic by trade, so I'm not looking for a silver bullet but just maybe some things to look at right off the bat.

From the info I have gathered he said that he has no hydraulic functions at all. PS, implement and cylinder operation for the front will not work at all.
He took the dual pump out and had some people go through it without there being a problem found. Looking at the hyd schematic the PS runs through the front half and cylinder operation through the back half. I'm going to say the pump is OK for now. Is there a bleed procedure on this pump?
Now for the kicker. After spending a few hours explaining to him how the Hyd system operates and a few things to check for himself (before I drove out there) He mentioned that the tractor will not even go into forward or reverse. This was news to me but now I'm thinking I have a different problem. Maybe related, maybe not because it seems the systems are separate.

So where should I start when I get out there? What should I look for first? Are there any common problems with these units that I should be aware of?
Hopefully this will be a laugher and take 10 minutes to fix.

Thanks for your time, very much appreciated.

John-

 

[bigbull338]

ok is the tractor an hst or gear tractor.from what your saying im still leaning towards the hydro pump being out even though he had the pump checked.also what was he pulling an doing with the tractor when the pump quit on him.

 

[johnpawl]

ok is the tractor an hst or gear tractor.from what your saying im still leaning towards the hydro pump being out even though he had the pump checked.also what was he pulling an doing with the tractor when the pump quit on him.

GST model

He uses it to bush hog. He didn't say if he uses the front bucket for anything, but he doesn't have anything heavy to lift that I know of.
One morning he hopped on the tractor and nothing was working. (or so, that's what I was told) Guess we can take that with a grain of salt.

 

[bigbull338]

im still betting the pump is out.

 

[k0ua]

Maybe not sucking up any fluid from the "tank" ? Does it have a suction hose with a big hole in it? or is it metal piped? just guessing here. But if you cannot develop any pressure ( a quick gauge check should tell that), and fluid is in the transmission/tank and not all out on the ground, perhaps none is getting into the pump from the suction side? Again.. I am no mechanic, and these are just guesses from thousands of miles away

James K0UA

 

[Tx Jim]

Possible pressure relief valve is malfunctioning. I presume simple tasks have been performed such as checking hyd fluid level and changing hyd filter.

 

[johnpawl]

Was just told suction line is soft-
No leaks or air sucking from lines-
Fluid and filter recently changed with proper fluid-

 

[dkf435]

Service manual flowchart says no 3pt then clogged filter, if only steering down defective pump. If everything works and no motion start checking GST. There is a regulating valve that feeds GST and steering .

Must go now be back later but check filter, pump and suction line.

David Kb7uns

 

[johnpawl]

Will be checking back after the weekend. Going on a mini vacation. :drink:

 

[k0ua]

Was just told suction line is soft-
No leaks or air sucking from lines-
Fluid and filter recently changed with proper fluid-

So the suction line is collapsing then?

James K0UA