JCB 3CX Gearbox Shaft seal leak?

[Classic3CX]

I have tried but often comes up with engine oils instead and the machine is that old it doesn’t list it

[essexpete]

JCB 3cx fluids

Try that link from a post by Topkit.

[Classic3CX]

Tried that too but doesn’t come up with a spec, I know it just says JCB special transmission oil in the manual, could anyone recommend one to use for a 1987 machine?

[agrimax]

Morris Terrain CT10 is the correct equivalent to JCBs Special stuff. Any that I know of with the Sychro Shuttle transmission have standard ATF Dextron 11.

[Classic3CX]

Ah ok, thanks for the info on that one, how can you tell if a machine has a synchro shuttle? I’m pretty sure mine has that, with the manual 4 speed to select gear first then just forward/reverse on the stalk.

[essexpete]

That sounds right. Some later options dispensed with the gear lever and had an electrically controlled power shift operated by the collar on the shuttle stalk.

[Classic3CX]

Oh I see. I have found some oil for a decent price and was wondering on peoples opinions if it would be suitable, I have also included a photo of the stalk set up. Any help is appreciated on this

[agrimax]

You have Synchro Shuttle as the stalk is a switch that operates solenoids on the top of the transmission. The older models with Borg Warner torque converter had a long,near vertical lever that operated a cable to mechanically move a valve for f/n/r. That oil will be fine too...

[Classic3CX]

Just wondering if there is anything I’ve missed or worth looking at on this. Managed to change the lip seal on the gearbox and also the filter which needed a clean, also replaced with new gasket, also seen the transmission gears which looked fine, I presume I may have to drain the transmission oil cooler at the front of the machine to get any residual oil out as so far drained around 12 litres. See photos below

[Ryan58]

Did you get it checked from some reliable heavy equipment mechanic and how bad is the leak is it constant or just while on work