Merlo juddering bucket

[Diesel Blue]

My merlo 32.6 plus with a loaded bucket judders when raising the boom and on the way down again dose anyone ever have had this problem

 

[Handy Andy]

Yes, ours does it with a loaded bucket when I'm loading grain lorries. It only does it when raising, not on the way down. I found that if I cut the revs down to about 1000 rpm and start to raise it with the machine stationary it's okay, so I can then drive forward and raise it at the same time, but if I raise it when moving towards the lorry it judders. One of the lorry drivers told me that a lot of them do it.

 

[Diesel Blue]

Thanks Andy
we have just acquired this used 2009 32.6 plus for our out farm and it seems to be in this machine but on our home farm we have at 32.6 top and it never has done anything like this I wonder is it just because it’s a plus
On the other hand we had from our now defunct merlo dealer few years ago a demo 32.6 plus for a few days before we bought our first merlo and I don’t think we experienced any juddering back then or if this would have stopped us buying a merlo in the first place
Is there any valves that can be adjusted any where

 

[neilo]

Would it not be an oil supply problem, for whatever reason? I know mine did it once when I had an oil leak which meant the oil got low (but far from empty).
I would guess there must be a strainer in the tank, could that be partially blocked, if the a previous owner had managed to get some carp in the tank?

 

[Dry Rot]

I don't know about Merlo but my MF 390 was doing this. A clever mechanic suggested the rubber cab mountings were perished. Changed the mountings and the problem disappeared.

 

[JJT]

There is anothe thread on here about this from a few years ago. We had 2014 32.6 top previous to our current merlo. It did the juddering from new, the 2008 32.6 top we had before that didn't do it. We complained and they changed a valve on it somewhere which sorted it. I can't remember which now, but its something to do with the self leveling. If I remember right, if you crowd over slightly as you lift, or make sure its not tipped right hard back over before you lift its not as bad.

 

[Planttech]

My merlo 32.6 plus with a loaded bucket judders when raising the boom and on the way down again dose anyone ever have had this problem

Hi firstly does the boom self level as you raise and lower it? If that works it could be the accumulator has failed on the lift ram circuit.

 

[Diesel Blue]

We got it fully served hydraulic filters and all before we used it all seemed to be good and clean I think it might be a valve some where it feels like it’s doing something odd on the way up when loading high trucks with a big grain bucket full of chicken litter

 

[Diesel Blue]

Hi firstly does the boom self level as you raise and lower it? If that works it could be the accumulator has failed on the lift ram circuit.

Thanks for the heads up it could be the accumulator but it doesn’t judder when the Bucket is empty iv raised and lowered flat out and seemed sooth my son was loading truck after truck as hard it would work

 

[Diesel Blue]

We should have that accumulator checked probably need to have a flow meter and pressure gauge on it it’s hard to know with accumulators

 

[Diesel Blue]

Hi firstly does the boom self level as you raise and lower it? If that works it could be the accumulator has failed on the lift ram circuit.

Sorry panttech
Yes the self levelling is working but when the machine stood for a while the symptoms disappeared we haven’t been loading since just handling around the yard since would it be to difficult for us to test the accumulator ! is that the one on boom lift ram
thanks again

 

[Diesel Blue]

I forgot to mention that when you crowd the bucket full back against the stops the boom bounces up a little bit

 

[essexpete]

I forgot to mention that when you crowd the bucket full back against the stops the boom bounces up a little bit

If the set up is similar to other telehandlers that will be the compensating/self levelling ram loading up on the boom.

 

[Diesel Blue]

Should that happen is there something like a valve to stop this jumping up or is the hydraulic system as crude as that I don’t think our 32.6top doesn’t do that and it also has boom suspension It the boom jumps up when you start driving forward it’s like it’s priming up suspension

 

[Sledgehammer]

Should that happen is there something like a valve to stop this jumping up or is the hydraulic system as crude as that I don’t think our 32.6top doesn’t do that and it also has boom suspension It the boom jumps up when you start driving forward it’s like it’s priming up suspension

I believe juddering when raising/lowering is related to the compensation valve, might need adjustment or replacing.
Our merlo has also developed a jump in the boom when you starting moving, not sure what the cause of this is though.

 

[JJT]

i found the jumping boom is when you have been carrying something heavy, then stop to unload then set off again. Because the merlo system turns off the boom suspension under 5kph, when you back over 5kph the suspension turns back on and there must still be pressure in the system from when you had a heavy load on. Our 2 32.6s both did it and our current 35.7 does it to a lesser extent.

 

[Diesel Blue]

I believe juddering when raising/lowering is related to the compensation valve, might need adjustment or replacing.
Our merlo has also developed a jump in the boom when you starting moving, not sure what the cause of this is though.

i found the jumping boom is when you have been carrying something heavy, then stop to unload then set off again. Because the merlo system turns off the boom suspension under 5kph, when you back over 5kph the suspension turns back on and there must still be pressure in the system from when you had a heavy load on. Our 2 32.6s both did it and our current 35.7 does it to a lesser extent.

Thanks for the advice guys
boom levelling compensation valve adjustment maybe should be my first and easiest thing to try first off
Dose anyone know how to adjust it and where is it located on 32.6 plus there’s valve on the crowd ram ?
Any of the experts on here advise me to have a go or leave it to the professionals

Thanks again guys

 

[Chuckie]

Thanks for the advice guys
boom levelling compensation valve adjustment maybe should be my first and easiest thing to try first off
Dose anyone know how to adjust it and where is it located on 32.6 plus there’s valve on the crowd ram ?
Any of the experts on here advise me to have a go or leave it to the professionals

Thanks again guys

This is the compensation valve and it will be the problem. Had a 2009 one that juddered from new, they replaced the above with a modified design that didn't fit the bracket that holds it, but cured the juddering. 2012 machine that we still have started doing it at about 5000 hrs, I stripped the valve down and replaced blown O rings but it didn't last long so ended up replacing the valve, they are about £700

The new one is made by rexroth, think the old one was "ildraulico italiano" or some such name. Anyway it has been fine since.

 

[Diesel Blue]

This is the compensation valve and it will be the problem. Had a 2009 one that juddered from new, they replaced the above with a modified design that didn't fit the bracket that holds it, but cured the juddering. 2012 machine that we still have started doing it at about 5000 hrs, I stripped the valve down and replaced blown O rings but it didn't last long so ended up replacing the valve, they are about £700

The new one is made by rexroth, think the old one was "ildraulico italiano" or some such name. Anyway it has been fine since.

Thanks it sounds that you have had some experience with merlo problems in this area and you have hit the nail on the head it’s best to replace with the new one the rexroth is a good make I wonder could my local hydraulic shop trace that valve
Cheers