The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
awemawson:
Wait till you find out how long it takes to tool up and create a program for a little job on your Mazak Ade and you'll know why :lol:
awemawson:
So at last the hydraulic adaptors have arrived that will let me replace the (closed neutral) Danfoss Orbitor with the (open neutral) ORSTA one :thumbup:
Simple nut and bolt job and a bit of plumbing. I'm using Dowty Seals (Bonded Washers) to seal the adaptors as I find them pretty reliable, and keep a stock. Then disconnect the hydraulic pipes and cap them for safety - don't want crud in the system :bugeye: Unbolt the Danfoss, bolt in the ORSTA and re-connect the plumbing. Took about 25 minutes. So nice working on things that come apart easily - well it should - this orbitor (and others!) have been in and out like a fiddlers elbow :ddb:
awemawson:
So does it work - Oh YES :thumbup: :thumbup: :thumbup:
Now I can tip without having to rock the steering back and forth :ddb: I do notice a difference in the orbitors though. This one takes more turns lock to lock than the other one, which is probably a 'good thing' as going over rough ground the implied extra steering force will be handy. (The orbitors are specified as so many cc's per rev of steering wheel, and with the volume of the steering ram together effectively set the 'lock to lock' turns ratio. However, as hydraulic rams like this one are asymmetric in terms of the volume opening or closing the ratio is greater in one direction than the other. The Buchner bank mower this orbitor came off had a double ended ram ie a rod protruding at each end which makes it symmetrical.)
I notice that the tipping ram is weeping a bit, but I knew that and have obtained replacement seals for it. Job probably won't get done until after Christmas as I have a few hundred saplings to shift with the dumper before then.
awemawson:
Well - holiday season, knee deep in family so distinct limitations on 'activity' but a few nice things happened recently.
First: Matthew Tinker and his son Chris visited yesterday as he's over from France for the festivities. Always nice to meet other Madmodders and chew the fat.
Second: and the is really a FIRST ! Persuaded the wife to drive the Thwaites dumper which has let me (using the JCB803) strip about 600 saplings from the river bank and start re-planting them as a hedge. I've got perhaps 55 out of 75 metres of the new hedge planted before I lost the light (and the will to live :bugeye:)
Third: While doing all this My Hermes delivered a parcel with the second hand 'tipper spool' that I've sourced - it's not identical, but came from another Thwaites dumper doing the same function, so I should be able to cobble it in and cure my oil leak on the original :thumbup:
Now let me point out - it's a BANK HOLIDAY in the UK yet MyHermes DID A DELIVERY - now people knock them, but so far I've never had a problem.
So a few pictures to prove it happened. Firstly Penny driving the dumper with the first batch of saplings
awemawson:
And here is the spool valve - it looked for all the world like a wrapped up Praying Mantis - but fortunately it wasn't - it was a spool valve :clap:
Same number of ports that seem to be marked up with similar functions. In slightly different places, and I've a feeling the bore sizes of the ports aren't quite the same - though it may just be a case of swapping over the adaptors. For instance the two ports to the steering ram look to be 1/2" BSP whereas the original is 1/4" BSP - needs further investigation
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