HD5 DOZER RESTORATION HAS BEGUN

Looking at the break in the axle - I wonder how so much stress could be places on that point .

As it is inboard of the sprocket and the axle has a outboard bearing (link belt double row) at end of axle on truck frame.

Seems the load would have had to come from the reduction gear system (bull gears).

Looks like some further investigation - then looks like you have that side of case open to find any other problems.

Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Mel: Nice yard full of equipment. Keep us up to date on your progress. Nice little 5 you have. Good luck on the repairs.

Orangeman

Be sure to check that top set of bearings on first reduction gear - every major failed rear I have seen that top bearing fails and breaks the rear case on outboard of that bearing

As the blade hardware pushes against the rear housing - the outboard bearing by sprocket to truck frame is a 2 unit Link-Belt cone and cup bearing, then next inboard of the sprocket is large timken - the break is behind that bearing so flex of shaft it seems could not be stress from outboard of the sprocket without destroying both outboard bearings.

Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

great pictures , look forward to more and when its done

The shaft may have failed from fatigue failure due to its original machining. The failure looks like classic fatigue failure. If somehow the shaft was machined with a very sharp fillet where the bearing surface met the larger diameter toothed section it could have introduced fatigue failure. A few years ago I was asked to examine the output shafts of two angle drives that were used to turn paddles in large vats at a mine's mill. These were two new units identical to older units that had operated without problems for years. The units operated continuously and both failed about a month apart after 1-1/2 years use. They both failed by fatigue where the shaft diameter was turned down for the bearing. I took down all the data including the shaft rpm and plugged it into a formula to predict fatigue failure and it projected within days of when these shafts had failed. The only difference between the old angle drives and the new one's was the radius of the fillet where the shaft stepped down to a smaller diameter. It is also possible that the outer bearing was not in line with the other two and it introduced a slight bending action on the shaft or the outer bearing's mount could shift a little and apply a slight bending action on the shaft.

Jack of all trades, master of none

Mel: Wanted to ask a favor, can you post a close up picture of the support that are holding the 5 up in the air. They look to be an excellent choice of support. Channel iron and Ibeam - is that correct?

I would like to borrow the idea to use on support for my HD6 while I am working on it.

Thank-you...Orangeman

G'day AC Mel Its great to see the AC construction machines being restored as they are slowly being forgotten , you have a nice collection there! How many do you have and can you post some more pictures please?

We have a couple in our family 4 hd11 a hd6 and 2 hd3 crawlers other than that there arn't many around where i live. regards steve

My HD5G Srl# 26784 1955 year - bought it in 1972 - HD11 ceramic steering clutch plates, ceramic button clutch in main clutch . HV7 Injectors, put on new track in 1978,

Below is the HD5 -HD6 track gauge.

Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

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