DWF

In 1961 the TD-15 was listed as still having the 554 engine and the TD-20 was listed as having the 691 engine both were gas starting. I don't know when they switched , but the 15 went to a 361 and the 20 had a DT429 I believe both by the mid 60's. DWF

When the TD9 92 series came out in 1959 it had a DT-282 which was the glow plug direct starting engine. In the mid 60's the TD-9B came out. The direct drive had a DT-282 and the power shift model had a D-282 non turbo engine. It ran much faster than the turbo engine. DWF

Nice looking 250C with a 573 V8 I presume? The other is definitely a 175, planetary finals a dead give away. DWF

Is it a 175, 175B, 175C? I thought I had some info on these SN's, but I only have for TD-15's. DWF

I am not an expert on these, but I had a 67 R190 with a 450 and it had a 2 barrel carb. DWF

Adams graders which became Wabco had IH engines as an option. I had a 1969 Galion 503A grader with a UD236 IH engine. It was a great grader. Used it for grading smaller usually narrow roads, had a 10' blade. DWF

Looks okay! As long as you bought it for the right price then you can afford some work on it. Looks like an 817 engine. It must have been the G series that had the Cummins. Good luck with it! DWF

Good to here someone young won it, got to get the young people interested. And another good thing, it's not going far. DWF

You'll make it now, you have the hard part done. Glad you got it out! DWF

I think that happened to me on a TD-9. that was about 45 years ago and I can't remember what I did to get it out but I remember it being more difficult the time that the nut came off. At that time they called that a stake nut. You had to hammer and punch that nut so it would not spin off. Sorry I can't help. but I know it can be done. DWF

That's the big 6 cylinder 817 like was in a TD-25 crawler. I don't think the 800 V-8 came out until in the 70's DWF

I am not experienced on these engines, but it sound great to me. I don't think it's too much smoke when you Throttle it up as long as it doesn't keep smoking. DWF

I don't think 500 parts will work. The trouble with something that looks close will not work. The pitch (distance between pins) is usually off and then won't fit the sprockets. Same thing with the pin bushing size although a larger size worn bushing has been known to (kind of) work. DWF

I think Green Diamonds were in K & KB series up to KB5. Cut my truck driving teeth on a 49 KB5 with a 4 spd trany and 2 spd axle hauling grain. DWF

Welcome to the Red Power forums! It looks as though you have a nice project to look forward to. Once you get going on your project don't forget to post on the construction equipment site here as that's where most of the dozer guys hang out. DWF

I thought they used a 4 cyl in the 510, according to my 86 spec book a 510B has a D-268 4cyl, not a common engine at all. a 515B loader used the D-358 and the 520B used a DT-358 engine.I just sold the 520C loader I owned for 15 years and it was a 1990 and it had the Dresser engine which was a Cummins 359. A friend just bought a 510 loader and it has the 4BT (239) Cummins that somebody put in there as it's actually an older IH loader. Who ever did the install did a nice job. DWF

KOO, Thanks for the update on your winter roads. You sure do have a lot of snow for so early in the winter. We had an early snow here in NE Minnesota (10-27) and most of it stayed. Have not had a lot of snow since but are forecast to get more this week then turning colder. The loggers need the cold for their winter roads. Good luck with your projects! DWF