The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
awemawson:
So when the master cylinder is fitted all that remains to fix is the centre articulation pivot.
It's a rather complicated affair, with a 'lower bearing' that is just a spherical bearing bolted between two large lugs, and an 'upper bearing' that comprises a fish plate with spherical bearings inset at each end, with greasable pivot bolts going though both. Repair kits are available, but for silly prices - a tad under £300 each so that's not going to happen :bang:
The complication is getting the old bearings out to examine them and re-engineer them. The individual spherical bearings are only £15 or so each from bearing suppliers dependant on size but until removed sizes are only a guess.
Now this centre pivot holds the machine together - remove it and the front and back of the machine part company :bugeye: So some method needs devising to support and contain the two halves - I may even temporarily weld bars across the pivot then just grind them off later.
awemawson:
Well after lunch the new Master Cylinder arrived, along with the special oil. These dumpers have 'wet' (ie oil immersed) brakes, and the actuating cylinder and piston are inside the axle, so the hydraulic brake oil has to be compatible 'mineral oil' and not standard brake oil. In fact there is some thought that it might have been topped up with the wrong oil at some time hence jamming up as the seals swell - if that's the case the seals inside the axle will be questionable - but that cylinder currently isn't jamming so fingers crossed on that one :med:
Unfortunately that wasn't all that arrived after lunch. We had a huge down pour, so work has stopped for the moment
vtsteam:
Andrew, cool to see you on another project! :thumbup: :clap:
awemawson:
Thanks Steve - I'm afraid that they are never ending :clap:
vtsteam:
Good! (I don't mean that in a bad way.....) :beer:
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