YM276D located and in garage

[rScotty]

rScotty I'm continually impressed at the depth of your technical knowledge. Wow!

For those of you who didn't know - rScotty was one of the founders of this Yanmar forum.

Thanks for the compliment, but I have to decline at least a part of it. All this mechanical depth of knowledge was pretty much standard knowledge for mechanics and engineers from the past generation. Most of those old timers were pretty good mechanics, machinists, and not too shabby at physics and math as well. Gearboxes, cam overlap, as well as the effects of fluids & gases flowing around corners were all subjects of lunchtime conversation over beers. That was the knowledge set required for those times. So if what we say makes a lot of sense when we are playing with our old tractors it may be because they are from that era too.

But times have changed, and today's mechanical focus has changed as well.
rScotty

 

[richriddle]

Thanks for all your suggestions. Tomorrow I will perform the paint on the tire exercise and see how it goes. You folks are wonderful.

 

[richriddle]

rScotty,

Thanks a lot. According to that brochure, the front tires should be 25x7.50-15......that was different than the information from the Internet.

 

[rScotty]

Page 250-00-2 in repair manual states 1.638 to 1 front to rear ratio. 0% runout with 0 and 6% wear limit.

Parts manual shows different wheel and rim size options starting on figure 92. The 276 actually had the option of standard or large ag tire options.

Winton, which repair manual is that? I don't find it in my Yanmar stuff...but maybe I've missed it.
Is that where you getting that tire info? Can you post a copy? I'm not sure what "runout" refers to, is it what US mechanics call "toe out"?
Likewise on the wear, how is the 6% measured? Six percent of what?
Never too old to learn,
rScotty

 

[winston1]

Formula for tire lead. Mounting Tires on Four Wheel Drive Tractors

Ratio info out of 276 repair manual Tire pictures and sizes out of 276 parts manual. Only showing pages relevant to 4 America 4 wheel drive.

 

[winston1]

For what it's worth I am having trouble getting to the last page on this thread so I may not respond. Sorry about that, of course some may be happy.

 

[California]

Question: was power steering standard, or found often as a dealer-installed option, on the larger Yanmars?

 

[winston1]

Question: was power steering standard, or found often as a dealer-installed option, on the larger Yanmars?

I am no authority but can tell you the 276 manual does not show it at all. It does show standard and Scandinavia.

 

[California]

... All this mechanical depth of knowledge was pretty much standard knowledge for mechanics and engineers from the past generation. Most of those old timers were pretty good mechanics, machinists, and not too shabby at physics and math as well. Gearboxes, cam overlap, as well as the effects of fluids & gases flowing around corners were all subjects of lunchtime conversation over beers. That was the knowledge set required for those times. So if what we say makes a lot of sense when we are playing with our old tractors it may be because they are from that era too.

And that's why I hold your posts in such high esteem. I'm from that generation too. And had/have near identical interests.

For years I kept my calculations - typewritten for permanence - of the final compound gear ratios in each gear of the early Hydramatics. (A/T first used by Cadillac, Oldsmobile, etc.) The early ones had a super-low first gear that leapt the car forward a couple of carlengths before shifting to second. And fourth gear locked the torque converter to a direct mechanical connection, effectively equal to Powershift. I've pulled and torn down a Hydramatic to put in fresh clutches/ bands/seals. They were user-maintainable if you were poor and had the Motor's manual and a torque wrench. While I was in high school.

A few years later I applied to Peace Corps and offered to challenge the technical half of the state teacher's credential exam that is needed for a certificate to teach auto mechanics. Aced it without any additional prep. What's on that exam is the body of 'common knowledge' you refer to.

My cousins have similar technical interests. One built a kilowatt ham radio in his bedroom, made from near-free salvaged army surplus gear. While in high school. Went on to get an AA in electronics controls over mechanical systems. He still travels the world as troubleshooter for a company that sells tech electronics gear to industry. His intuition is worth as lot of money to them. His brother worked sound crew for the biggest '60's rock concerts. Also an AA in electronics. Then a career at UC-Berkeley in the Physics lab inventing/building test equipment to support doctoral students who need observed data to verify their hypotheses. A third cousin (no degree) took the study of engine design and tuning like you described, to the point where he got invited to England and worked as a tuner on a world-champion racecar team. Come to think of it his Army 'career' (draftee - two years) was notable too. Assigned to tank-driver school, he could make that thing do stuff the trainers thought was impossible. He was a trials-bike enthusiast, after that a tank was nothing. It's all physics, the intuitive kind. They promoted him to instructor instead of sending him out.

I didn't make a career of mechanical engineering but has remained my primary hobby. I love the way these Yanmars were designed. Those designers knew that the owners would intuitively understand how they function.


Sorry to pull this thread off-topic!

 

[richriddle]

Question: was power steering standard, or found often as a dealer-installed option, on the larger Yanmars?

rScotty posted a YM276/YM226 sales flier on another thread. According to one page of that flyer, power steering is optional.... Here is the link to the page rScotty posted.

http://www.tractorbynet.com/forums/files/yanmar/516270d1500817842-ym226-ym276-original-sales-flyer-orig-adv_ym226-ym276_pg-10-jpg