The Craftmans Shop > New from Old
It's BIG, Yellow and digs holes! JCB 3CX Project 8 is joining the Tractor Shed
awemawson:
So now we are left with the pair of taper roller bearings and a big seal (the one that's leaking) to remove - how hard can it be :scratch:
Well it took the whole of the rest of the day :bang:
The outer bearing came off the axle spigot with a few solid thumps on the hub to encourage it leaving the inner bearing and seal on the swivel spigot. The inner race was tight against the seal shoulder with no room for any pullers - I did try modifying one to suit but to make the claws fine enough to fit they were far too weak.
In the end I mangled the roller cage letting me remove it and the rollers which left me a shoulder on the race that I could get at with a drift. By carefully heating the inner race with a tangential flame I was (with several iterations) able to tap the race off the spigot - it took ages !
So now I was left with just the seal - again no gaps for pry bars etc. It turned out that the steel part of the seal had rusted to it's seating on the spigot. After much tapping and cajoling it eventually moved just enough for me to insert a crowbar after which it was mine :clap:
Now the rust looked pretty horrid, but actually it was fairly light and a good application of emery and elbow grease cleaned it to a tolerable finish.The new seal will sit on this surface with Blue Hy-lo-mar sealing compound so it should be absolutely fine.
The outer bearing races tapped out of the hub easily so no issues there.
With any luck it's just a case of putting it all back together tomorrow with new bearings and seals
awemawson:
Apart from initially setting the axle oil draining ready for later it was a day of putting it all back together !
The seal went back on to the axle stub reasonably easily, and tapping the inner race onto the stub wasn't too bad once it had actually engaged. I turned up a bronze drift to tap it home all the way to the seal.
Once I'd fitted the outer races for the inner and outer bearings onto the wheel hub I reassembled the gear annulus and its eight bolts all torqued to 320 nM (which is amazingly tight!) making sure that the pop marks I'd made on disassembly matched up to keep the orientation correct.
Time now to re-fit the sun gear facing the same way that it was when removed (I'd marked the outer face) and it's retaining circlip.
There is a large O ring seal between the wheel flange and the 'top hat' of the hub - I fitted a new one and smeared it and the flange face with blue HyLoMar to hopefully keep the oil in.
Then offering up the 'top hat' (which carried the planet gears) to the Wheel flange, with a bit of wiggling the gears engaged and it went home. These two are really held together by the wheel studs, but there is a pair of bolts from the rear to stop them parting when a wheel is changed. These bolts were dressed with Loctite pipe sealant as the threads form a passage to the outside world for the oil. They were then torqued to spec and the wheel re-fitted (blooming heavy!)
I had ordered 20 litres of gear oil which conveniently was delivered this morning and the axle draining was finished so I refilled it. I tried using my 12v fuel transfer pump but 90 weight oil was too much for it even at 24v so it was a case of squirting it in 1 litre at a time from a squeezy bottle that I kept refilling.
The hub got the same oil treatment after which the machine was brought down from its' cribbing and taken for a little drive round the yard.
Early days yet but no oil drips from the axle ! (That's blown it !)
vtsteam:
Glad that worked out, Andrew. :thumbup:
awemawson:
Thanks Steve, always good to reduce leaks, though they do say that JCB's mark their territory :clap:
Trouble with doing this sort of job is that you notice other things that should be done. The near side and offside steering swivel housings are tied together by a very heavy rectangular bar with beefy 35 mm diameter bronze bushes pressed in to accept 25 mm bolt retained pins. There is far too much play allowing the wheels to wobble independently.
My first reaction was to measure up and turn some new ones, but frankly when I saw the price of new ones it's not worth it, especially as I'd have to buy the bronze. The bushes and pins are just over a fiver each, and there are grease seals that I couldn't make anyway for less than a pound. So order placing tomorrow morning !
russ57:
Now the continual feed rust prevention system is disabled, you'll have to paint it...
-russ
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