JCB 3C Mk11 Replacing seal/bearing in back axle

[time travel]

Hi

The story continues

I have a leak in the back axle it appears to be coming out of the seal around the hub. The rim (inside) of that tyre is covered in oily grime and when the gearbox had oil in it, there was a slight leak in the underside of the housing covering the axle etc. I do not want to put the new oil in as it is not cheap and would rather fix it before I get it moving again.

I have looked at the manuals and I am not quite sure of the plan of action. There appears to be a nut and split pin holding the axle into the end of the gearbox (from photo in manual).

Do I need to remove the whole back plate of the gearbox to get to the nut to remove the axle? That plate looks like it holds the gearbox to the frame.

If so, is it just a simple a slide out (axle) replace seals and bearing and then a bit of play to get axle aligned to cog and back in to re-tighten the nut. With the rim and tyre removed and replaced

Also is the lubrication in that section just the gearbox oil I am unsure from diagram if it is just one compartment or separated with different oil. Oh by the way backhoe is a manual gearbox no shuttle etc.

Thanks for any help
John

[time travel]

Hi

Just going through the manual again.

On page 348 JCB Workshop Manual

It appears there is a castellated nut with split pin items 8/9
This nut appear to connect to drive/hub axle.

I presume 15 is the dust seal
14 felt washer
13 oil seals
12 bearing

So I take off back plate get to castellated nut, undo and slide out axle.

Than replace parts 12-14?

Now what happens to part 10? Do I grab that as I pull out the axle?

So I am guessing the spring balance load is to test the tightness of the bearing 12 on the axle housing??

I also guess it is the same oil as the gearbox.

Does that sound about right?

Thanks for any feedback, re my presumptions and any handy hints etc.

Yours in digging with oldies
John

[diggertoy]

hi there,
ive got a v reg 3c which had a similar leak got a mechanic to have a look got wheel off and no
mechanic.did it myself as allready baught seals.removed rear centre back plate after draining oil.
your right theres a castleated nut held in by a cotter pin.remove and the half axle will pull out
i was lucky as the existing seals tapped off with no heat.once there replaced i fed the shaft back in
then got our lass to jiggle into place while i refitted the nut & cotterpin that was 4 yrs ago no problems since
also you can check the gear teeth while backplate off.i had one broke removed metal,no probs since as
only use it off road.hope this helps ,bob.

[time travel]

Hi Bob

Thanks for the feedback.

Did you have to support the gearbox when you took the back plate off?

Also are you able to hold part 10 through the back plate?

Glad to read that your JCB has been travelling well since then.

Thanks
John

PS:
Rain again and again only localised flooding this time. When will it end

[Mark.Rive]

Hi John, the saga continues eh! Can't help with this, but I have to do both mine so keep us posted please. Although Bob seems to detail it just fine. As ever let me know if you need numbers. Cheers for now, Mark.

[time travel]

Hi Mark

I will let you know what goes on, just got to get a 10tonne jack and wait for the ground to dry as it is in a bit of a boggy spot. Well all the land is very wet.

By the way Mark what are the numbers for:

14 felt washer
13 oil seals
12 bearing

Thanks
John

PS
Just waiting on the part for the steering pump.
And then this and I reckon she will be pulling out stumps very soon. Well when the ground drys

[Mark.Rive]

Hi John,

felt washer NT7183
Seals 813/00228
Bearings 988/00018
Mark

[time travel]

Hi John,

felt washer NT7183
Seals 813/00228
Bearings 988/00018
Mark

Sorry Mark forgot to say thanks.

Your a good bloke

[time travel]

Just an update:

I finally got the back of the geabox cover off yesterday. Two nuts where, well very difficult. I do not have access to a heat gun/oxy set so had to wait till I could find a ring spanner to fit the nut.

So now up to finding a 3/4inch socket for the wheel nuts there are two that will not break with my 1/2inch set. Breaker bar a bit bent, no warranty on that one now.

Will upload some photos in the near future of the job so far.

Looks like the main drive cog may have been replaced. Some scoring on the shaft that it slides onto. Still got the red/brown paint in the inside of the box and very little metal, well only really very small shavings. Not bad for a girl this old.

More to come when the rain goes away. We had almost a week of no rain. Still trying to source gear for a addition to the machinery shed for the girl. No name yet

John

[Mark.Rive]

Hi John, like you i have no acces to oxy. I have found the plumbers rothenberger self lighting blow torch awesome. Produces a flame around 1600c and if you're no trying to heat to bigger a lump it works fine. I've drifted out all my seized pins using it. Cost 34 quid for the gun and 15 quid for gas from B&Q It would not shift my nearside wheel nuts 'cos some doughnut has welded them on Thanks for the update Mark.