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Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder

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awemawson:
Now here come the assumptions  :bugeye:

I am ASSUMING that the old orbitor presented resistance to flow when not being rotated so that pressure was available to operate the tipping ram. (*)

I am ASSUMING that the new orbitor only presents resistance to flow when being operated, hence the tipping working if the wheel is rocked (*)

Now buying a new orbitor is out of the question as they are hundreds of pounds, so what's the solution?

If I were to insert a 'pressure maintenance valve' on the output from the orbitor is it likely to work.

Comments please from any hydraulic guru's :scratch: :scratch: :scratch:



(* See later posts - this is INCORRECT - it's the other way round, the new one is 'closed neutral' and the old one 'open neutral'

appletree:
Just keep on rocking :lol:

smiffy:
Just a thought but where is the PRV, is it built into the tipping valve or is there a separate  stand alone PRV   For the tipping ram to work from your diagram the P and T ports in the orbitor would have to be closed. If the flow went from the pump to the tipping valve and then to the orbitor  and then returned to the tank the system would work but priority would given to the tipping ram , not ideal but workable.The system can only work with one return  unless there is a priorty valve fitted in the system somewhere. Mike

awemawson:
A bit of 'google research' shows that there are two or more varieties of steering orbitor. Centre closed and centre open. In the neutral position the centre closed variety blocks P to T whereas the centre open variety, which I think I must have fitted, passes oil from P to T unless the wheel is turned.

I suspect, but yet to be proved, the solution is to fit an inline pressure release valve between the out port on the spool valve, and the P port on the orbitor. This way the spool valve will have pressure to operate, and when the wheel is turned so will the orbitor ...... I think ....
:scratch:

Again ... informed comments welcomed ...... :scratch:

smiffy:
This would depend on the tipper spool, is it open centre or closed centre . From your diagram it should be open centre.It could work if you feed from pump to p port on orbitor , t port to tipper spool  and tipper valve to tank but this is dependant on where  the prv is .Mike

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