JCB 8060 Main boom dropping

muddle84

Hi Folks,
MY Jcb 8060 has a developed a problem where the main boom will start dropping slowly. It is only an intermittent problem so I don't think it is the ram seals. I spoke to fella today who said it could be the hydraulic filter that needs changing. I can't see how this would cause the problem though??

I was thinking it could be a seal gone in a valve or one of the servos somewhere?

Any ideas that could point me in the right direction would be a great help?

Madmechanic

muddle84 wrote: »

Hi Folks,
MY Jcb 8060 has a developed a problem where the main boom will start dropping slowly. It is only an intermittent problem so I don't think it is the ram seals. I spoke to fella today who said it could be the hydraulic filter that needs changing. I can't see how this would cause the problem though??

I was thinking it could be a seal gone in a valve or one of the servos somewhere?

Any ideas that could point me in the right direction would be a great help?

Hi there. Most of the time these problems are in the spool bank. I honestly cant see how a filter could have any odds on this problem

muddle84

Madmechanic wrote: »

Hi there. Most of the time these problems are in the spool bank. I honestly cant see how a filter could have any odds on this problem

Thank you. The filter didnt make sense to me either so thanks for that!! Is it usually a seal that goes in the spool bank? Or just start stripping the main boom part of it and see if theres anuyhing that shouldnt be there??

Madmechanic

muddle84 wrote: »

Thank you. The filter didnt make sense to me either so thanks for that!! Is it usually a seal that goes in the spool bank? Or just start stripping the main boom part of it and see if theres anuyhing that shouldnt be there??

Is the spool controlled by a cable or servo? If cable i would check that its not sticking slightly at times. Try simple stuff first because spool valves can be tricky. It could be a seal or a slightly worn spool

muddle84

Madmechanic wrote: »

Is the spool controlled by a cable or servo? If cable i would check that its not sticking slightly at times. Try simple stuff first because spool valves can be tricky. It could be a seal or a slightly worn spool

I think its servo but not 100% sure as i havent gone pulling at it yet. Could it be a seal in the servo? Or something sticking in the servo? I imagine the servo would be alot easier to strip than the spool bank?

Madmechanic

muddle84 wrote: »

I think its servo but not 100% sure as i havent gone pulling at it yet. Could it be a seal in the servo? Or something sticking in the servo? I imagine the servo would be alot easier to strip than the spool bank?

Possibly could be. Could even be a slightly sticking spool. It might be hard to find because its intermittant and your dealing with such fine tolerances

muddle84

Madmechanic wrote: »

Possibly could be. Could even be a slightly sticking spool. It might be hard to find because its intermittant and your dealing with such fine tolerances

It did seem to be getting progressively worse so that might make it easier to diagnose! Now to find time to go pulling at it!!! I think the spool bank is under the cab on it so that will probably have to come off!!

Madmechanic

muddle84 wrote: »

It did seem to be getting progressively worse so that might make it easier to diagnose! Now to find time to go pulling at it!!! I think the spool bank is under the cab on it so that will probably have to come off!!

Best of luck!!!

Tail Docker

muddle84 wrote: »

It did seem to be getting progressively worse so that might make it easier to diagnose! Now to find time to go pulling at it!!! I think the spool bank is under the cab on it so that will probably have to come off!!

Should be an access panel and there ought to be either cables or solonoids on the bank itself - usually it is a seal or o ring gone inside the spool itself. If it were mine, I'd pay someone to pull it apart, the possibilities of effing it up are large and wondrous.

muddle84

Tail Docker wrote: »

Should be an access panel and there ought to be either cables or solonoids on the bank itself - usually it is a seal or o ring gone inside the spool itself. If it were mine, I'd pay someone to pull it apart, the possibilities of effing it up are large and wondrous.

Ah i dont rely on this machine for my living or anything like that so i have plenty of time and paying somebody to do it will be absolutely no fun whatsoever Thanks for the advice all the same.

Tail Docker

muddle84 wrote: »

Ah i dont rely on this machine for my living or anything like that so i have plenty of time and paying somebody to do it will be absolutely no fun whatsoever Thanks for the advice all the same.

It's not the fun factor(I get that bit) it's having the right gear to measure the output pressures and leak back etc. You need gauges to set it properly and that gets dull rapidly.

muddle84

Ah now that is a fair point and something I overlooked. Is it impossible to remove the spool without effecting the current settings?

Hopefully it will be something to do with the cables or the servos and I won't need to go this far.

muddle84

Just to close this off. I called a mate who is a plant fitter and the twonof us went at it. He quickly diagnosed it as a problem with the ram and he was right. We pulled the ram apart and there was a great big chunk gone out of the piston. The bit that broke off was luckily too big to go back through the hydraulic system. Replaced the ram and dumped the oil. New filters and back to normal again!

corcaigh1

muddle84 wrote: »

Just to close this off. I called a mate who is a plant fitter and the twonof us went at it. He quickly diagnosed it as a problem with the ram and he was right. We pulled the ram apart and there was a great big chunk gone out of the piston. The bit that broke off was luckily too big to go back through the hydraulic system. Replaced the ram and dumped the oil. New filters and back to normal again!

Jaysus ya would think JCB would have fail-safes to prevent this occurrence for safety reasons..

Kevin McCloud

corcaigh1 wrote: »

Jaysus ya would think JCB would have fail-safes to prevent this occurrence for safety reasons..

A chunk out of the piston is a mechanical failure, what do you think should jcb do?

muddle84

Kevin McCloud wrote: »

A chunk out of the piston is a mechanical failure, what do you think should jcb do?

Im not sure what could be done to stop it either. I have absolutely no idea what would have caused it either though.

Suckler

Kevin McCloud wrote: »

A chunk out of the piston is a mechanical failure, what do you think should jcb do?

Stick in a load of sensors then have lads complain about electronics and how its only a scam to get the dealers more cash fore resetting them. So as soon as a sensor flags something it'll be the first cable clipped.

corcaigh1

Suckler wrote: »

Stick in a load of sensors then have lads complain about electronics and how its only a scam to get the dealers more cash fore resetting them. So as soon as a sensor flags something it'll be the first cable clipped.

Haha very true!