The Craftmans Shop > New from Old
JCB 803 Saga
awemawson:
Almost all tracked vehicles use the same method of track tensioning. The idler sprocket slides in a track way, and is forced outwards by a grease filled cylinder the other end of which rests against a massive spring seated firmly against the chassis. The tension is applied by pumping grease into the cylinder.
So to remove the track you undo the grease fitting and let the piston in the cylinder move back releasing tension (and masses of grease!) With the tension released I had a devil of a job getting the first track off, levering, prying, cussing a bit. Eventually I decided to remove the bolts from the drive sprocket as I was changing it anyway, thus allowing the track to slide sideways. Eventually it came off :bang:
awemawson:
With that off, I had to unbolt the grease cylinder from the old idler sprocket, bolt it on to the new idler, and fit the new drive gear on the track motor.
awemawson:
So now to put the new track on.
At this stage I was delighted that my friend Steve turned up wanting me to mend his clay-pigeon thrower, and being a nice chap gave a hand and made a difficult job far easier :ddb:
Then it was a case of 'rinse and repeat' and we did the other side resulting in new tracks and sprockets all round :thumbup:
awemawson:
So was it all really necessary :scratch:
Oh yes, what a difference. The machine now tracks smoothly without the clunking it made before, and just look at the hooking on these teeth.
Anyway there was a nail in the old tracks - they'd never hold air :lol:
Sadly Steve's clay launcher was beyond fixing - imagine a 'hamster wheel' of 6 mm plate sides and 6 mm rods for the bars, all bent significantly squiffy by being dropped on on edge while attached to a heavy machine which fell on top :bugeye: The end plates were bent all over the place and every bar was bent like an off set bend.
mattinker:
I'm glad you found the puncture, but I was a bit disappointed about the clay pigeon thrower!
Cheers, Matthew.
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