Merlo Boom Suspension

[Hjwise]

The boom suspension has stopped working on my Merlo. The wires to the solenoid were bypassed long ago - when you activate the solenoid the boom raises sharply a short distance but then goes solid. Any ideas would be greatly appreciated

 

[lostdog]

Check the wires at the bottom of the boom just as they connect to the ram. Lots of debris and crap lays just where the wires have to move to follow the ram up and down. Had to do mine a few weeks back. It had done 9.5k hours to be fair.

 

[Hjwise]

I’ve run new wires to the solenoid a while ago. I know it working as the boom raises a bit when you turn it on.
It seems like there is too much pressure pushing the boom up, as it appears to have a bit of suspension travel when I have 2-3 tonne on the front.

 

[lostdog]

Ah OK. Maybe one of the accumulaters has failed?

 

[Chuckie]

I’ve run new wires to the solenoid a while ago. I know it working as the boom raises a bit when you turn it on.
It seems like there is too much pressure pushing the boom up, as it appears to have a bit of suspension travel when I have 2-3 tonne on the front.

Sounds like one of the accumulators has gone. There's a thread on here about it, I put a jcb one on because it was about £500 cheaper! I can't seem to find it at the moment because I'm on my phone, I'll put a link up later.

 

[Hjwise]

I’ll take a look, thanks. Sounds like an expensive fix, but not having the suspension drives me round the bend.

 

[Hjwise]

Sounds like one of the accumulators has gone. There's a thread on here about it, I put a jcb one on because it was about £500 cheaper! I can't seem to find it at the moment because I'm on my phone, I'll put a link up later.

Is it a case of taking the weight off the boom and unscrewing them or is there more to it than that?

 

[Chuckie]

Merlo 32.6 boom suspension fault...........

One for the Merlo experts on here @asm @Planttech @x121x or anyone else that might know.... I've got a Merlo 32.6 with the boom suspension not working properly. I know that it's common for the wiring at the bottom of the ram to break, so have re done the wire and plug further back up the loom...

thefarmingforum.co.uk

 

[Chuckie]

Is it a case of taking the weight off the boom and unscrewing them or is there more to it than that?

Yes but they are tight, I had to take the whole unit off and get it in the vice to unscrew.

 

[Planttech]

The boom suspension has stopped working on my Merlo. The wires to the solenoid were bypassed long ago - when you activate the solenoid the boom raises sharply a short distance but then goes solid. Any ideas would be greatly appreciated

I may rise when activated. It will only work when travelling over 3 or 5 kmph. Provided it’s still wired as new

 

[Hjwise]

I may rise when activated. It will only work when travelling over 3 or 5 kmph. Provided it’s still wired as new

I have it wired directly to the suspension switch. Whilst I’m sorting this problem I should probably wire it back as intended.
Is it possible to test the accumulators or best to change both?

 

[Hjwise]

I haven’t had time to look at it closely yet but if the accumulators have failed I’m not sure what is providing the pressure to raise the boom? Does the solenoid purely stop the flow to and from the accumulators or is there more to it than that?

 

[davidroberts30]

I haven’t had time to look at it closely yet but if the accumulators have failed I’m not sure what is providing the pressure to raise the boom? Does the solenoid purely stop the flow to and from the accumulators or is there more to it than that?

if there is 2 accumulators then the low pressure 1 is flat if the boom will lift and seem to work ok with a load on

 

[Chuckie]

I haven’t had time to look at it closely yet but if the accumulators have failed I’m not sure what is providing the pressure to raise the boom? Does the solenoid purely stop the flow to and from the accumulators or is there more to it than that?

One might be gone, they are different pressures, does it work at all with weight in?

 

[Hjwise]

It does work with a load on (although it seems to have limited travel). Both accumulators have the same part number.

 

[davidroberts30]

It does work with a load on (although it seems to have limited travel). Both accumulators have the same part number.

they will but be at different pressures

 

[Hjwise]

they will but be at different pressures

Arr. I see. 20 bar and 45 bar. I’ll get a new lower pressure one and take it from there. Thanks

 

[davidroberts30]

Arr. I see. 20 bar and 45 bar. I’ll get a new lower pressure one and take it from there. Thanks

ask your dealer if he can recharge it?
be honest if he can get them both checked

 

[Planttech]

Arr. I see. 20 bar and 45 bar. I’ll get a new lower pressure one and take it from there. Thanks

Go to a hydraulic specialist they will be cheaper if they can match them. My parts books do show a different part number for each accumulator

 

[Rust]

Boom suspension has stopped working on 34-7 . No power to solenoid on ram. Is there a fuse ? No mention in book