HD5G Final Drive Seal

likely general gear in Idaho has that part

Les - I have one.  PM me if interested.  Thanks, Bob.

Does anyone know what the actual difference is between the First Type seal (KIT NUMBER 073763) and the Second-Type seal (KIT NUMBER 088665)?

I suspect that the Second-Type is longer to make up for some other difference between the old and the newer. There certainly seems to be a significant tolerance difference as noted by dadsdozerhd5b and myself.

Does anyone know of a source for the production drawings of our machines?


Edited by Les Kerf - 18 Mar 2022 at 11:53am

The sprocket compresses the seal package as install it
Need to remember that point in your measurements.

There is the specific glue for these still available, from Diving Shops, neoprene cement. Silicones or other materials do not bond well either to the cast or the neoprene rubber seal bellows.

If I can add to DMiller's post do use a cement for "Neoprene rubber" and ensure all mating parts are clean and oil free. Solvent, and acetone are your friends here. 

UPDATE:

After taking dozens of measurements, making drawings, and much deliberation I ended up by making a 1/4" spacer for the right-hand side and a 3/16" spacer for the left-hand side. I made alignment pins out of drill stock and epoxied the pins and spacers into the housings.

New seals were purchased from General Gear in Boise, Idaho and we then glued them in place using the prescribed neoprene cement made by 3M ( we now have enough of that stuff to last many lifetimes).

It has all been back together for 6+ weeks now and my Son-in-law has put 5-6 operating hours on it with no leaks yet. If it is still good at this time next year I will call it a success.

I thank everyone for their help and input, I would have been lost without this forum for guidance on this project.

Codger wrote: How close were physical dimensions were the replacement new seal to the removed seal? I can't fathom someone would put something together with that much of a "gap" between squeezing surfaces and attempt to bridge this with silicone. Appreciate the follow up with the repair.

The replacement seals appeared to be identical to the seals which we removed; in fact, the removed seals still appear to be serviceable if given a proper cleaning.

There was no evidence of the previous mechanic attempting to bridge the gap with silicone; my hypothesis is that they 'assumed' the parts to be compatible, their choice of adhesive was certainly in error though.

I am guessing that the axle/sprocket combination is not original to this machine; the parts manual shows a different seal to be used with the later 20-spline sprocket/axle but the only seals available are for the earlier 6-spline assembly. The parts manual also shows a 'First type outboard bearing arrangement' and a 'Second type outboard bearing arrangement' which are intended to be used with appropriate sprocket/axle combination.

Since I did not dismantle the axle/sprocket portion I was unable to see the splines so as to actually count and verify which components we have here.

I believe that what we are dealing with is a mis-matched hodge-podge of various and sundry components thrown together in a haphazard manner.

Your mileage may vary

gemdozer wrote: The earley sprocket shaft 6 sleene  use boot seal number 049109 and the 20 spleene shaft use 051112 and have some with spring assambly and rings seal in stock and the cage outboard is not the same too.

@gemdozer:
Can you get a measurement of the 051112 seal like I did in the picture that I posted above in this thread and post it here please?

No need to take a picture, just the measurement  so that we can verify the difference.

Thanks for the help

gemdozer wrote: I check my boot seal assambly with gasket  and 2 rings seal and have 1.802 inch

Thank you gemdozer

For all practical purposes your seal assembly is identical to the one I measured.

I do know that our machine has the second type of sprocket nut that is used on the later tractors, and I assume (but cannot verify) that the outboard bearing bracket assembly is for the earlier machine. Perhaps that is where the mismatch occurs.

Les Kerf wrote: UPDATE: ... It has all been back together for 6+ weeks now and my Son-in-law has put 5-6 operating hours on it with no leaks yet. If it is still good at this time next year I will call it a success. I thank everyone for their help and input, I would have been lost without this forum for guidance on this project.

Further Update:
It has been over a year now and the machine has  another ~30+ hours on it, the right side shows no leakage whatsoever but the left side lost ~3 quarts; not perfect but we can certainly live with it at that rate whereas previously it lost pretty much all of the gear lube out of both sides in about a month.

I am going to claim a qualified success for now, the left side will have to get quite a bit worse before we would tear it down again.

Codger wrote: Les Kerf wrote: [QUOTE=Les Kerf]UPDATE: ... I am going to claim a qualified success for now, the left side will have to get quite a bit worse before we would tear it down again. But the environmental damage you are knowingly causing.....

Three quarts of gear lube in a years time.... meh.