Jcb 530/70 special super

[Hesston4860s]

So my 530/70 was working perfectly !, I scooped up a bucket of rubble and when I went to tip it the tip has gone slow. I crowded it back and went to tip again and it was almost none existent, crowded it back again and it wouldn’t tip at all !.
So I Switched it off left it for half an hour and once restarted it tipped and crowded perfectly, till I raised the boom a foot and the tip went slow again till it got so it wouldn’t work at all again !.
No oil leaks anywhere that I can see either.
Anyone any ideas ?.

 

[Hesston4860s]

Little bit more info !
Once the tip has stopped working and the carriage is in the mid position, if you lift the boom up n down several times the carriage will end up fully crowded back on its own.

 

[ACEngineering]

Little bit more info !
Once the tip has stopped working and the carriage is in the mid position, if you lift the boom up n down several times the carriage will end up fully crowded back on its own.

Its probably the tilt ram lock out valve, BUT i have had a JCB before which had a tee on the main lift ram in to the self leveling ram with a one way valve, this was to allow some of the lifting force to be taken on the self level rams i think, anyway the ball in the one way valve fell out and it messed up the self leveling as oil was going the wrong way.

 

[Mark7810s]

Had the same issue on a customers 535/125 the other day was an o ring in the check valve
This is what I found on removal

Replaced the o ring and good as new

 

[Hesston4860s]

Nothing wrong with the o-rings, in fact nothing looks untoward with it at all !.
A new one is £304.18p and they have it in stock.

 

[Hesston4860s]

I think it’s all sorted. I’ve not used it in anger which will be the real test, but ran it up for 3/4 of an hour and it all still worked fine.

 

[Northeastfarmer]

My 530/70 did the same and it was the check valve...new one sorted straight away