Cat dozer repair

[abaker1624]

This is a repair that i did on a dozer, had to cut out old bearing mount and replace with an updated one.

 

[abaker1624]

More pictures. How do you post all pictures at once.

 

[Jack Burton]

Cool stuff. Technique wise, is your job similar to millwright work in a lot of ways?

 

[abaker1624]

No not really, Just a techhnician that has been lucky enough to work with some realy smart and talented guys in the past few years. They have taught me that you need to always pay attention and learn from others, and it has paid off and i have been able to show my diffrent abbilities so I always get alot of diffrent jobs to do. Sorry rambling.

 

[Tarheelgarage]

good looking professional work.

 

[Displaced Hokie]

Nice work!

 

[theoldwizard1]

Watching some videos of folks welding on some big, thick high pressure steam pipes. They ground a 45° bevel almost down to the full thickness of the pipe. Then they applied the first weld layer. Grind, inspect, repeat. Multiple pass to get to the full thickness.

The pipe was enormous and there were several people working on it in full helmet/mask/jacket/gloves with pressurized air for breathing. The pipe was pre-heated to well over 100°. Sounds like hell to me !

Any guidelines/special instruction from Cat ?

 

[dcubb]

Damned "Pig Iron". Those pics bring back memories of days past. Kind of miss them though.

 

[CAOS]

Watching some videos of folks welding on some big, thick high pressure steam pipes. They ground a 45° bevel almost down to the full thickness of the pipe. Then they applied the first weld layer. Grind, inspect, repeat. Multiple pass to get to the full thickness.

The pipe was enormous and there were several people working on it in full helmet/mask/jacket/gloves with pressurized air for breathing. The pipe was pre-heated to well over 100°. Sounds like hell to me !

Any guidelines/special instruction from Cat ?

Each piece of pipe is given a bevel, the standard is 37.5*. Then depending on the weld process it will either get "land" which is usually about 3/32" so when applying the root(first pass) the welder has a bit of meat to push against. If one was to tig weld or STT the joint there would be no land given.

Heres an example of a typical arc weld:
1st pass - root - 6010
2nd pass - hot pass - 6010 - keeps root pass from cracking
3+ pass - fills - 7018 - fill the bevel to just under the O.D of the pipe
Final pass - cap - finishes off the weld bead, this is what the eye will see, that being said just because it looks good the X-Ray will tell you if the weld is truly good!

 

[jamesemery728]

Great looking repair. Any idea how much that blade weighs?

 

[mvptrukin]

Great job--how many hours did you have in it?

 

[EvilWelder]

Looks good, I did the same job on a TD-7 that the monkey running it ripped the blade off and ruined the gimble. Not cheap, but cheaper than a new dozer.

 

[abaker1624]

Blade weight is 3750, took about 10 hours to remove blade and replace mount.

 

[EvilWelder]

10 hours is not bad, did you do pins and bushings on the angle cylinders while you were in there?.

 

[abaker1624]

No they were all good, it only has about 2000 hours on machine.

 

[NUTTSGT]

Neat repair, not something you see everyday.

 

[kald]

Nice work, what process did you use and did you have to preheat the blade?

 

[abaker1624]

Was not a difficult repair, used a carbon arc to cut out old bearing mount. Then just used a Miller 300 with a 22a feeder. The only thing speced was to TAG weld the mount to the blade.

 

[AeroNautiCal]

Was not a difficult repair

That is what marks out the professional!

Great workmanship, I've not seen such heavy engineering as I only worked on motorcycles.

 

[bw77]

Was not a difficult repair, used a carbon arc to cut out old bearing mount. Then just used a Miller 300 with a 22a feeder. The only thing speced was to TAG weld the mount to the blade.

What does TAG weld mean?

 

[abaker1624]

This is all I know ,I asked the same question.

Google

TAG stands for Tungsten Active Gas and is a recent modification to the name TIG, Tungsten Inert Gas, but as far as we can see there is no difference
between the two methods. It seems to be following the idea that MAG is differentiated from MIG. MAG is used when the gas contains oxygen or carbon
dioxide because the gases are not truly inert. However, this distinction is not clear for TAG so we suggest you stay with convention and call the
process TIG (or GTAW if you prefer the American term).

 

[Heavy Metal Doctor]

Good work!
Reminds me of the old days....and some not so old days......

 

[EvilWelder]

Looks like you used an E71t-1 dualshield wire, that whats I would have used.

 

[MBfreak]

Nice job. Excellent attitude, repair first!!

Been awhile since I saw similar, but working in an iron ore mine in a distant country ( Liberia, LAMCO) during the seventies/half eighties taught all of us there the value of good craftmanship and that EVERYTHING, except stupidity, can be repaired. There were some unbelievably skilled Liberian welders, who were self taught when they started with us. Having real modern tools, good conditions and a very decent pay made them aces

I wonder how you managed to keep the tolerances and alignment on the welded in ring, and how you positioned it prior to welding. Any hints on that would be most welcome.

Best regards

Ola

 

[woodsman42]

looking for info on replaceing track idler on d3 cat dozer

 

[harvey29]

SWEET!! is all I have to say looks fun!

 

[crewchief888]

SWEET!! is all I have to say looks fun!

it's much more fun on a 100* day in central florida.....

 

[tlevan03]

I work at CAT and I know how much it can **** to get those blades off. Not an easy job. Ive had a few that have had very high hours and it makes it that much harder to get off. Good job.

 

[harvey29]

it's much more fun on a 100* day in central florida.....

I here ya I'm a mechanic but I don't usually see anything that cool.

 

[LLave]

How do you line up the upper bearing with the lower once the old one has been touched out? Looks like that could be tricky.

 

[pepi]

How do you line up the upper bearing with the lower once the old one has been touched out? Looks like that could be tricky.

Good question I was thinking the same.

 

[toolfreak]

I hated rebuilding 6 way blades! People never would return the puller rod needed for the center pin so we would spend half a day looking for it.