Digger ram creeping

[hoff135]

When changing the bucket on my volvo ec25 today. I noticed the dipper/arm was moving on its own towards being perpendicular. I thought the seals on the ram must be going although I'd never seen it creep before.

Anyway I was playing about with it from the cab and discovered that if it pull the dipper back towards the cab it will creep outwards again towards perpendicular.

This all makes sense if the seals are going.

However as the dipper was creeping away from me I pulled VERY gently back on the lever to make it come towards me. What actually happened was the dipper actually started moving away from me faster! Which is opposite of what it should do. As I pulled slightly harder on the lever the flow of oil obviously was enough to make the dipper come towards me as it should.

Given its doing this im wondering if I have a problem in the spool block rather than a bad ram seal?

Will maybe try blanking the pipes on the ram to see if it will creep but its not at home.

Anyone seen this?

Thanks

 

[br jones]

seals are fecked ,letting oil by ,you pull the lever a bit and more oil leaks to the wrong side of seal ,

 

[Mur Huwcun]

Rear of spool block you have a large return pipe, whip pipe off and unscrew the fitting. It’s a restrictor, if there’s any traces of metal there open the dipper ram straight away as that’s where the bits will be coming from

 

[hoff135]

Rear of spool block you have a large return pipe, whip pipe off and unscrew the fitting. It’s a restrictor, if there’s any traces of metal there open the dipper ram straight away as that’s where the bits will be coming from

You think there's scoring?

 

[Mur Huwcun]

You think there's scoring?

No,end nut starting to come off or even fallen off. If no bits in the return then try re sealing.

 

[hoff135]

No,end nut starting to come off or even fallen off. If no bits in the return then try re sealing.

Okay. Are you thinking more the o ring seals between the piston and the rod rather than piston and the cylinder? Nut come slack and play allowing oil through?

 

[Mur Huwcun]

Okay. Are you thinking more the o ring seals between the piston and the rod rather than piston and the cylinder? Nut come slack and play allowing oil through?

What I’ve seen is nut loose on end of rod therefore seals are floating about but bits in the hydraulic system wil play havoc with your servo system and cause irregular movements. Whatever it is you need to open the ram I would feel just to check.

 

[hoff135]

What I’ve seen is nut loose on end of rod therefore seals are floating about but bits in the hydraulic system wil play havoc with your servo system and cause irregular movements. Whatever it is you need to open the ram I would feel just to check.

Think you're right will need to take it off in the morning just to be safe. Thank-you

 

[hoff135]

Oh well found the problem

Thankfully no damage done to the cylinder

 

[hoff135]

Anyone know a breakers or a place that might have the piston for this machine?

Just off the phone and volvo don't make the part anymore. Would have to buy a new ram

Many thanks

 

[Teddy99]

You could get a good engineering firm to make you one.

 

[Phil P]

Anyone know a breakers or a place that might have the piston for this machine?

Just off the phone and volvo don't make the part anymore. Would have to buy a new ram

Many thanks

Is there a good engineering shop or ram/hydraulic fabricators anywhere near you? Wouldn’t take much to make a new piston. I’ve had a new ram made from scratch for a tenth of the price of the manufactures price.

 

[Jim75]

Guy in Invergordon is good for that kind of stuff. McLaughlin I think his name is

 

[hoff135]

Guy in Invergordon is good for that kind of stuff. McLaughlin I think his name is

Thank you very much for this. Just dropped it off to him hopes to have it ready for tomorrow!

 

[Jim75]

Thank you very much for this. Just dropped it off to him hopes to have it ready for tomorrow!

helped us out a couple times now, if he’s stuck you’re knackered

 

[Jim75]

How did you get on @hoff135

 

[hoff135]

How did you get on @hoff135

He made a new piston for the ram and had me running the next day. Highly recommend.

Thanks for telling me about him.