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JCB 803 Saga

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vtsteam:
Andrew, you can make one, I'll wager -- despite the number of interconnected channels. Hell, you've brought 70's CNC machines to life!! It's a block with holes in it. You can do it!

awemawson:
Steve, thanks for your confidence but it would be a last resort, as it would be quite a long term project, and meanwhile the digger sits unmovable, and I need to use it !

The day isn't getting any better - the chap in Wales has just rung back to say he has not got one  :(

There is a slim hope that a fellow in Southern Ireland may, but he's the chap who let me down before over the control valve

mattinker:
Andrew,

Very bad news! Were is it broken? Is there no way you could stitch it like metal stitching in cast iron? A slot at right angles to the split, a tongue of Al with stainless screws coming in from the side to lock it in place, may be a bit of a mad idea, possibly in conjunction with low temp solder.

Can't you pre heat the whole block and TIG it?

All the best, Matthew

awemawson:
Matthew I'd be very wary of tigging or any other high temperature method unless I had a second block to fall back on. There are (seemingly) reamed bores in there for the various valves to seal onto that can easily be distorted, and I suspect seats for valves at the base of some bores.

Until the whole caboot  is stripped I cannot be sure exactly how things connect up in side. There is a 'main pressure release valve', a (logically) T shaped one way valve pair, and a bit I don't fully understand that changes the pressure setting dependant on how much oil is demanded from each of the three pump sections - I have the hydraulic diagram but translating it into physical reality isn't simple.

I want to try and set up my Gopro camera pointing at  it to see exactly where the oil emerges as once it starts everything gets covered and the forensic trail gets blurred  :bang:

It's been suggested that I could replicate it using standard hydraulic components 'off the shelf' but I have a feeling it's made as it is as it's operation is more subtle that that approach can achieve.

mattinker:
Andrew,
I thought you'd got further into stripping than you have, so you don't actually know where it's leaking? OK, you don't need any more suggestions for the moment!

Good luck with pinpointing the leak, regards, Matthew

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