The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
modeldozer:
It might be easier to repair the old steering control valve, repair kits are availeble.
On assembly there is one critical step as explained on page 10 of this manual
http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/dev_216975.pdf
For more info search for "Orbitrol steering valve"
Abraham
awemawson:
I can only assume that there is a PRV built into the tipper spool valve. I can just about see a hex headed 'something' in the face where the UP and DOWN ports emerge.
awemawson:
Modeldozer - thanks - an interesting link. The original one is a Danfoss though, not an Eaton
Now a few more facts discovered:
A/ The original is definitely an 'open neutral', ('ON' in the type number probably means this !) I can blow through from P to T. I tried linking out the orbitor so where it is in circuit is replaced by a straight though 1/2" bsp to 1/2" bsp conical connector, and sure enough the tipping ram works just as it should
B/ Before finding it was open neutral, I blocked the pipe from the 'Out' of the spool block to the orbitor with a stop end - this jams the spool block tight making the spool virtually impossible to move, and this of course is the state it's in when plumbed as per that diagram. It brings into question whether there is a pressure relief valve in the spool valve, as I'd expect it to open under these conditions :scratch:
awemawson:
Obviously the best solution is to replace the orbitor with an 'open centre' one, so I've just trotted off to the workshop to try blowing through the ORSTA one removed from my Buchner bank mower.
Sure enough it's 'open centre' :ddb: -
I'd rejected it as it's ports were a different thread from the original so I couldn't directly use the original adaptors which were UNF. As the ORSTA is BSPP it's an easy thing just to order up the correct ones (two 1/2" BSPP to 1/2" BSPP 60 degree cone males and two 1/2" BSPP to 1/4" BSPP 60 degree cone males) which should turn up in a few days. Then, IF the ORSTA still works we should be cooking on gas :clap:
Not been able to find any info on the ORSTA on line in English, so suck it and see !
AdeV:
Hmm, you've got a stonking great big CNC lathe sitting there just begging to make adapters... and you've ordered them? :scratch:
Maybe I'm just making excuses for buying a big CNC lathe myself.... :loco: :palm: :lol:
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