The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
awemawson:
Then the moment of truth - dismantle the cylinder and compare new set of seals.
First remove the end cap - these frequently are horribly stuck, and I've been putting 'Plus-Gas' on the threads of this one for the last few days - it came out easily :thumbup:
Certainly the new seals do look to be correct :thumbup:
- it's a 1" rod and 2" bore cylinder - supplier could only say "about 50 mm on the outside" which isn't close enough in this case :bugeye:
The rod seal is probably the leaking one, but I'll change all of them
awemawson:
Next the spherical bearings - they were HORRIBLE :lol:
They are welded on 'attachments' to the rod and cylinder with a 1" bore to the sphere itself, but I couldn't find any - only metric ones, and if I were to use those I would have to cut the mounting lugs off the dumper itself and make metric ones as well as 25 mm pins.
The eyes will need slicing off the rod and cylinder end whatever I use, for the replacements to be welded back.
I did however find a source of 1" 'spherical inserts' that have a parallel outside, so I'm going to turn up a housing for them and weld the housings to the cylinder and rod end. They are on order so a bit of delay in the proceedings.
I decided to make new pins anyway as the old are rather worn
awemawson:
Now the pins are simple affairs! Just a 4" length of steel bar with a tab welded on one end for a locating bolt to stop it turning, and a co-axial hole up the lower end for a grease nipple, with a radial 3 mm hole for the grease to squirt out of into the spherical bearing.
I had some EN8 1" bar to hand but it could as well have been mild steel. So I set too making bits. First cut the components, then drill the various holes, then weld them up - how hard can it be :clap:
The shaping of the keeper plates was done free hand on the sanding table - shape isn't critical
awemawson:
I decided to give them a light nickel plating to stop the rust. Can't be too heavy as it's easy to plate a pin so it no longer fits - ask me how I know :bugeye:
They were sand blasted and I didn't polish them before plating as the job doesn't warrant it. A quick 15 minutes in the plating tank and a trial fit
Spurry:
Sorry to be dim, but what is that gadget in end-cap-removal.jpg photo. I've obviously lead a very sheltered life. :scratch:
Pete
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