Hydraulics chattering

[big_orn]

Hey all, been on travel with no computer access - ugh!!!.
This past weekend my 3 point lift began acting up. After a few minutes of use it began chattering and lifting slowly. It did this all weekend. Changed the filter and checked fluid level. It is still chattering and jerking when lifting. Any ideas?

On edit - The hydraulics for the Front End Loader still work fine - no problems at all with it. Puzzling, huh?

 

[Renze]

I think it has something to do with the hitch valve/lever system.

When they changed the controls to the rubber mounted cab versions, I think they forgot something that causes teh lift problems, or something that causes something to stick.
I'm not as happy with our 5245's lift, but havent had time to go see for myself, and not to forget: it's still working.

Have you tried moving the control selection lever, draft-mixed-position ?? Ours is stuck and that has to do with it, i'm sure. sometimes i had a really jerking lift but that stopped on its own.
For me, the problems are not big enough for me to open it up (yet)

 

[big_orn]

Hello, Renze. Yea, it's still working, but I can't do any fine leveling because it jerks so bad. At first I thought it was the pump, but the loader works fine. I have tried the draft lever and it does not help . Will keep an eye out for further suggestions.

 

[treaney]

Hi Big Orn,

Doe your tractor have a knob that can be used to lock the lift? If so, is this fully open?

Also, have you tried operating the lift with the front loader fully lowered? The loaders consume a lot of hydraulic oil when elevated i.e. cylinders and hoses.

Tom

 

[big_orn]

I have thought about a knob and it only makes sense, but I can't find one unless its hidden somewhere. I bought a manual and it does not help . The manual is no help at all really. Is there another adjustment that effects only the 3 point lift?
And, yes, I have tried it with the loader in all positions - no help.

 

[crystalman]

I think that the hydraulic lines on the loader need checking out incase they have not been installed correctly-chattering noises are not good!.On our 6748 we have put a tee peice off the rear hydraulic outlet(trailer tipping pipe) into a three lever spool valve block with a return back into the transmission via the return valve on the rear axle casing.Then you lock the external hydralics lever fully open so that it is continually pumping oil around the circuit ready for immediate use and control the flow to the loader or the lift arms with the priority flow valve.This may sound complicated but after trying to get a loader to work on an old MF 135 with no auxillary pump it is child's play!
Steve.

 

[big_orn]

Yes, it sounds complicated, but I bet I can figure it out. Do you have a simple schematic or a hand-drawn sketch you might be able to paste here? I know I could check it out if you could possibly do that.
Thanks.

 

[treaney]

Hi Big Orn,

I can sketch out a schematic but will not be able to post it on the Zetorworld forum. Renze - can you help here?

Send me an e-mail at treaney@iol.ie and I'll e-mail it to you.

Tom

 

[Renze]

You canupload an image here.

 

[crystalman]

I am going on holiday for a few days over the Bank Holiday.When I come back I will check to see if Tom has clarified things a bit more.If not I'll take some digital photos of my loader to show the sort of piping required to make a circuit
Steve.

 

[treaney]

Renze,

I have posted a scanned in image of a hand drawn schematic of a hydraulic circuit for a front loader to:




Tom in Ireland

 

[big_orn]

That is just what I needed. It looks like the servicemen who installed my Loader did not??? hook it up directly to my pump, but instead by-passed the circuit which allows the Loader to be the primary receiver. Now I have to go into the rear housing and hook it up direct!!! Thanks for your sketch, Tom!!!

Big Orn

 

[treaney]

Glad to be of service Big Orn,

Going into your rear axle housing sounds complex???

Don't you have an external hydraulic quick release connector that you can use to feed your front loader?

Tom

 

[big_orn]

Yes, but that connection sends the hydraulic fluid to the Loader first - before the 3 point hookup. My pump is in the rear housing - I guess, because I can't see one outside the tractor, on the motor. Under my seat there are two steel lines coming from the housing that goes to the remote. Keep in mind that the manual I bought was not dedicated to the 5211. It does have portions in it that can help , but not enough detail. So I am basically shooting in the dark as how to plumb the loader and lift as one unit. I would really like to have an exploded view of the hydraulics and components. Your sketch was enough to let me know why my lift was starving, now it's my turn to figure it out.

 

[Renze]

When we fitted our loader on our Ursus C-385 A first, we had a similar problem with the hitch.
Then we figured out that the system had two return lines, one for oil overflow when no pressure is needed and the oil flows back to the reservoir and one pressureless return for oil that returns from the cylinder when you move it up or down.
The oil from the first mentioned line should flow through the hitch valve block too.

My neighbor, and on our own loader, we use one line from the external hydraulics at the back to feed the loader, so we never get trouble. However plumbing the loader directly to the pressure line before the other valve blocks would be a nicer solution, you keep your external remote free for other uses.

So, you cant make a split off of the oil lines, they have to be plumbed in series, not parallel.

================

Hey, eh... like Crystalman said it....

 

[crystalman]

Well you go away for a few days and everything is sorted out!
In my years of experience of Zetors and Skoda cars nearly every problem is due to the ignorance of someone who has been there before you mucking about with things.czech engineering is sound if a little unconventional and often requiring regular maintenance and adjustment.But when you start to think Czech you can expect years of trouble free service!
Steve.

 

[big_orn]

Welcome back, Crystalman! How was the trip? Yea, these guys only wanted to get that Loader on, get their money and send ol' so&so on his way. Anyway, gonna see what I can do as soon as I can get a blowup of that rear housing assembly and see what all I gotta do. Thanks for the reply.

 

[Renze]

Crystalman, again, you stole my words...

Skoda cars ?? please tell us more...
I have been thinking of one, but i turned out to get a Volvo.
Also something robust, like my 440, it uses a Renault engine (with volvo modified cams, bearings, etc.) the Renault 5 Turbo racing boys usually go to the Volvo dealer for a clutch set, because the volvo parts can take a lot more...

 

[tele]

hi i am from the australian outback and i too have a problem with jerky movements with rear lifters on a 6945 i have replaced all o rings and replaced piston seals (2) and ring, had the ring honed out.. the problem persist although this is now not occurring as frequently. have been told hydralic lever positions may now be causing the problem. can anyone describe functions of the 3 differing levers, their differing positioning and the correct positioning for levers so as to allow for positional lifting to occur alone free from "mix and draft".

 

[tele]

hi i am from the australian outback and i too have a problem with jerky movements with rear lifters on a 6945 i have replaced all o rings and replaced piston seals (2) and cylinder, had the ring honed out.. the problem persist although this is now not occurring as frequently. have been told hydralic lever positions may now be causing the problem. can anyone describe functions of the 3 differing levers, their differing positioning and the correct positioning for levers so as to allow for positional lifting to occur alone free from "mix and draft".