Unusual Wear on D9H Roller

[jdmacpherson41]

Anyone ever had just one roller fail?


This one has worn up into the frame., not sure how to fix it

Any thoughts?

View attachment IMG_1852.jpegView attachment IMG_1851.jpeg

 

[pittsburgh cat man]

I believe they used to make a weld in insert for that problem

 

[Nige]

I would bet on the roller having lost its oil and seized the bushings.

If the insert is not available then building up and machining back to size is the only other option I can think of. It would probably require the track frame to be removed and turned upside down to do it.

 

[pittsburgh cat man]

Seen it done both ways welding it up will probably have to remove frame and roller on each side to make room for tooling for boring bar

 

[bccat]

I have seen it many times on D8’s that were pioneering logging road’s on the west coast of B.C. usually the first roller behind the idler, they would cut the worn section out of the roller frame and weld a new section in place. They had the machine shop fabricate new sections with the holes threaded, lots of miserable work welding, the didn’t even split the track, just loosened it and raised the tractor as much as they could. Cheers

 

[nicky 68a]

As others have said,it’s time for an insert done as they say.
However,I’ve got my out of this pickle in the past with a D6C and a D8K by lowering the roller down on the bolts enough to ram halves of aluminium piping in both ends and crush them back up tight with the bolts.
Believe it or not,it has worked.
Your D9H bolts will be strong enough to crush a good chunk of aluminium in there,run it,then dog them up tight again.

 

[nicky 68a]

However,It will depend on how bad it’s spun in the first place.
Did the roller bearings collapse?

 

[jdmacpherson41]

Ya they seemed to have disintegrated. Currently just a pin rattling around free in the cavity.

When you speak of inserts, how exactly does that work?

 

[Nige]

When you speak of inserts, how exactly does that work?

You cut out a piece of the track frame and weld in a steel insert machined to the correct size and profile for mounting the track roller shaft.

 

[jdmacpherson41]

It’s my Dad’s machine, he’s had it since 84. Got Tormont in Canada to re-do the undercarriage 25 years ago. Hasn’t seen too much work since then.

He was planning on filling gap with weld. Hand grind it down. Put new roller in.

 

[nicky 68a]

The proper insert method is as Nige states.
You can certainly try welding it up and civilizing it up somewhat then keep dogging the bolts up every time you use it.
Once settled,feel free to cut some alloy piping up to create a bush to squeeze down on.
Will probably be ok for what bit you use it for.
On another note,both my spun rollers were rear ones.

 

[oldtom]

I would bet on the roller having lost its oil and seized the bushings.

If the insert is not available then building up and machining back to size is the only other option I can think of. It would probably require the track frame to be removed and turned upside down to do it.

as you say Nige, remove track frame and reclame by line boring (weld and bore to size) check all the others ,get the tool from cat and check that oil at least every 1000hrs