The Craftmans Shop > New from Old
JCB 803 Saga
awemawson:
Well the Devcon has at least lasted for one day's light digging :thumbup:
Pig poop all tidied up, transported to the wife's vegetable patch compost heap, and the (rather large) entire heap turned over in a 'sides to middle' fashion.
The bad news it it's developed another oil leak :bugeye: - I noticed oil dripping onto the left hand track. After a lot of fumbling about and wrapping dry towel around fittings one by one I've located it on the Main Relief valve block where the input from one of the pump sections enters. (This machine has three hydraulic pumps all on the same shaft on the engine). It's either the 'O ring' in the face seal on the pipe or the bonded washer seal where the pipe adaptor screws into the valve body.
Fortunately there is a removable section of floor to the left of the drivers seat giving access from above, and it's fairly open below if the cab is slewed to 45 degrees so that it's between the tracks. However try as I might I cannot get the fitting unscrewed :bang: It needs special pipe fitting spanners.
Special man with special spanners coming tomorrow (same chap who did the hose on that Hedge Flail last year.)
mattinker:
Your getting to know this digger too well too soon!
Regards, Matthew
awemawson:
--- Quote from: mattinker on July 01, 2015, 11:21:01 AM ---Your getting to know this digger too well too soon!
Regards, Matthew
--- End quote ---
Ain't it always the way :lol:
No doubt a few more gremlins will come out of the woodwork pipework before it settles down :bugeye:
Pete.:
I have a handful of old britool/king dick ring spanners heated and bent and with the ring cut for doing this work on our Brokk machines. I DID have an old bronze one with very heavy walls around the ring which worked for one particular purpose where previous steel spanners had spread but one of the guys at work used it and left it in the rubble :(
awemawson:
Well this is going from bad to worse :bugeye:
Mr Spanner had van problems (Ford ECU packed up) so only got here today at lunchtime - got the fitting out only to find that the actual leak is the main aluminium housing having a crack adjacent to the fitting :bang: :bang: :bang:
Needless to say they are like hens teeth, and every machine being broken currently seems to have been robbed already. JCB want about a grand for just the block without any of the gubbins.
Theoretically it should be possible to reverse engineer the existing block and make a copy, but in practise there are so many interconnecting threaded bores, most with a seat cut at the inner end for a relief valve or pressure setting valve that the chances of success are slim. It runs at 3000 psi so needs to be sound.
Talking to specialist breakers this seems to be a known problem, especially in hot weather. When did it happen - hottest July day on record :(
At the moment my hope is with a breaker in Wales who thinks he may have one of unknown goodness, but still £250 :bang:
It's tempting to strip it down and attempt a repair using one of the low temperature aluminium solders - probably mill a channel with a ball ended cutter and fill the trench. (I think TIG welding is likely to distort things too much).
If the breaker turns up trumps, I'll fit his, and if it works use it, and if not attempt a repair on one of them.
In all not a good day - the replacement tracks, idler sprockets and drive sprockets arrived yesterday so I'm in too deep to stop now - it's a bit like the addicted gambler who has to double his stake every time he looses to keep up with his stake :scratch:
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