CAT Loader Arm repair

2:32 totally sounded like up to me also! Great work guys.

Forensic metal failure analysis. This is a basic study as to how things break. This exact failure can be seen in u-joints, leaf springs drive lines. I got my introduction into failure analysis when I worked for Cummins in the late1970's, they used to publish training manuals. So we would get a new booklet on various truck related issues, work would quit early, pizza would be served. They did things like drive line vibration, different topics. The one i remember was metal failure types and how to read them. This one as you say probably started in the unnecessary hole. I think the term that was used was "shelling" [as in sea shells] the pattern from where the crack originates leads directly to where the crack starts. The most interesting one I had was a harmonic vibration. The are ultra sonic vibrations that melt metal molecule. Those training sessions that companies used to do in the early days was great stuff!

That CAD-joke was nice. Have to remember that. 👍🏻

Kudos to the apprentice for keeping it cool in the eye of the storm

I really appreciate you showing the part of the plate not going as planned, IDK if I can speak for anyone else but seeing someone else go through the same struggles helps me at least take a little pleasure off myself knowing Im not the only one lol. I dont have the experience of you, and I dont work on equipment like this but once you figure out the best way I am typically about done with the job and dont see anything like that for a long time always something new I love it thank you.

I love it when the pros make mistakes and admit it. It is refreshing to me, I constantly make huge errors, so these videos don’t hurt my self esteem too much

NICE JOB !!! The "Cardboard CAD" ..........was priceless ......... never heard that one before.

It des not take a welding engineer to see why that member broke...That huge hole in the middle reduced 1/2 the strength of it IMHO. Super great repair job Greg.

This guy is a maistro when it comes to welding. I see a huge repair, and he makes it look as simple as me making a peanut butter and jam sandwich. I don't know how much that repair costs, but it's worth every penney.

I've done a little welding in my time and have been a loader operator for 27 years. You repaired it as well as could be done for structural integrity. I'd trust it. Good job.

I did a similar repair on a 966 back in the mid 70’s. I put a shaft in the lower pivots and in the broken one to square off of.

About that 1/2 inch plate. As you know the customer is always right even if he’s wrong Thank you Sir for this video & chance to learn

It's going to fail it wasn't welded with an old high school surplus Lincoln Tombstone with rods that the dog pissed on at least six times while drinking a case of Busch Light while the girlfriend Tammy screams on about how that case of Busch was supposed to last until Monday between the both of you.

Oh, man... That pivot arm juuuust made it, with the plate underneath it. Great video.

Top work young man, including admitting to a mistake. Honesty is the best policy. Well done.

Gotta love that CAD system! (Cardboard Aided Design)

The hole location for the angle sensor is wetoddid. The mistake was easy to make but the designers letting such silliness leave the factory was goofy vs. welding a shield to protect the electrics rather than burying it which no doubt someone was proud of because it looked cooler. BTW the squirt bottle trick is classic and works a treat with water-based machining coolants too.

That's a good repair. It's no wonder why it broke there between the hole in the cast steel. And the drill holes in the weekest points. I understand that it's there to protect the sensor from damage. But also greatly weekends the structure of the casting. Great repair job in the end.

Great job, Greg!! I sure like your approach, as always!! No one could have done a better job than you!! Thanks again, Vic!!

Your CAD joke was great timing. I commented about your excellent CAD skills this morning on your excavator wing video