Thread: Adaptor shaft

I might have a spare. Give me a few weeks to sort some stuff

I tried my 1984 RRC SAE10 axle spline in the LT230 input gear. The fit is too loose. Admittedly it was the rear axle.

When measured, the male axle spline set is 2mm smaller in diameter than the LT230 female spline set. Don't know if it is a different situation for later RRClassics.

Originally Posted by Ancient Mariner

MXA 5 R 28 spline x 36.75mm OD x 6o degree

$1400+ gst for hub 4140 and shaft 4340 nitriding hardening

$1200 +gst for 4 sets

There is some extra machine work a spacer to control end float.Between oil seal section and end of imput gear and the 12mm speedo gear removed and some excess cut off the main shaft With freight and stuffing around probably not worth it but another option

AM

28 spline yokes are plentiful providing the right diameter, make sitecs adapter look more viable, will mean changing to a mxa though

http://www.aulro.com/afvb/attachment...-230-image.jpg

This keeps popping up in my little brain

Originally Posted by Vern

http://www.aulro.com/afvb/attachment...-230-image.jpg

This keeps popping up in my little brain

And its coped with 15000kms so far with 5.9 litres and 160+hp in front of it.. Towing a very bogged mate out in soft sand on an SA beach was the big test, as it was done in anger as the tide was coming in!

How would you rate it as a field serviceable item?

Yeah, I know...unbreakable

I wonder, how many people are looking for the adaptor case/shaft, just shaft, just case? What is the common factor - just a like for like replacement for broken Sheldon unit; field serviceable because there is an uncertainty about reliability in some area; totally new approach like Sitec's suggestion, theoretically bomb proof?

Sitec:
- you used the zf output shaft as the anchor point for the draw bolt, to apply pressure to the gearbox output bearing, so how did you attach the zf output to the gearbox output shaft - something like Sheldon?
- how much do you realistically think you can mill from the inside of the LT230 input gear before the wall becomes too thin?
- if possible, what is the diameter of the shaft you put into the gear?
- was any thought given to ideas like vacuum brazing the shaft into the LT230 gear, rather than welding?
- did you weld the shaft into a smooth bored input gear, or did you maintain some sort of male/female spline along with welding?
- remind me if I've forgotten, what became of the LT230 input seal in your creation? Abandoned, specialised size?

Is there a way of merging some of Sitec and Ancients ideas and presentations? I would still prefer gearbox output bearing preload to come from the original drive flange and bolt. Then attach the second drive flange with say female 28 spline 36.75 per Ancients. Into that goes Ancients cut down male shaft 28 spline. But what would have been SAE10 at the other end converted to Mariners welded join. I get the feeling the trend is heading to enlarge the diameter all round for super robustness. That spells trouble for the oil seal.

My concern with cutting down Ancients male 28 spline is that there may only be about 30-35mm of fully developed spline to work with if an oil seal is to kept. As said before if the oil seal is dispensed with then the 28 male spline can be lengthened, along with changes in design of the drive flange to take advantage. The puma example looks like its in that region of 35mm ie quite short, so maybe it has the strength.

So field service in the future would mean replacing an input gear with weld attached broken shaft adaption - much less trouble than pulling the transfer case in theory, provided you can get all broken bits out or they fall to the bottom of the adaptor case. Then replace it with a new input gear with weld attached male 28 spline.

End float, I guess, is a minor problem or non existent because there's been no change to the way the input gear bearings are preloaded. And no drawn bolt required to preload the gearbox output bearing.

Originally Posted by Vern

http://www.aulro.com/afvb/attachment...-230-image.jpg

This keeps popping up in my little brain

Sitecs way is definitely the strongest but will present a few problems for you .Do you add 100mm ?between the gear and female spline or move TC forward alter tailshafts and fabricate new LH mount maybe off Gb PTO cover .Or move engine back even more problems .Just something to consider


AM

True Noel, as i don't have it apart i have no idea on the lengths. I have used the system before but the gearbox output shaft was quite long.