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June Craigslist

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10 years 10 months ago #88044 by old-iron-habit
Replied by old-iron-habit on topic Teeter totter
Hey Pete, you could have been a colleger professor with that explaination. I believe you are right that the frame mounting point does not matter when the blade is up. Moving the trunnions back would help if the blade was to be moved closer to the front of the machine thus shifting the center of gravity back a bit. When the blade is up the machine is acting like a tetter totter and being front end heavy it wants to tilt forward.
Roger

1937 Cat #11 tandem auto patrol,diesel, w/plow and wing, 6K506SP, 1937 RD 4 Ag Crawler RD5356, 1939 Cat 22 2F5429, 1952 Model 212 Grader 9T03427, 1953 2U D8 Dozer 2U20751, 1961 922A Rubber Tired Loader, 59A812, LeTouneau LS Cable Scraper, Cat/Lincoln 600 AMP Dual Welder, DW-21 Cat Scraper, DW-10 dump wagon/water wagon

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10 years 10 months ago #88049 by Snuffy
Replied by Snuffy on topic June Craigslist
This is a topic that could go for ever. You raise valid questions Pete, but I have to agree with Zip. The trunion position does effect how it is sitting due in part to the lift linkage positioned where it is. I do agree the blade maybe to0 heavy for the tractor, but all the weight of the dozer is hanging on the lift linkage arrangement (which is mounted about a foot from the front of the track frame) this is where the weight is transferred to the tractor. If you extended the arms and moved the cylinder mounts back closer to the trunions, I think you would have a quite a difference in weight transferred to the rear of the machine. If you take a loader and get a bucket full of material, and moved the mounting point ahead 30" you would have the same effect as the picture shows with this dozer. Just my thoughts, not an engineer either(not even an accountant, lol) just an ol' cat skinner

Snuffy
1937 22, 1939 D7 9G, 1950 D4 7U, 1953 D4 7U,1953 D2 5U, 1962 D7E

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10 years 10 months ago #88092 by janmeermans
Replied by janmeermans on topic Lifting the rear

weight over idlers blade is heaver then rear end of tractor trunions are towerd the rear not on cg causing it to lift the rear end up. old d8h's 6 roller frame did the same thing then they went to 7 roller frame. and i'm bar fare an expert its just the way it looks to me!


My two cents is as Pete states, when the blade is on the ground the weight is on the cutting edge. Just as soon as the ram lifts the blade, a moment arm is created equal to the distance from the lift mechanism pin down to the track frame, which in the picture is at least 3 feet. The blade weighs more than the rear of the tractor so up it comes. I don't have experience with a D2 but it seems discussions have been had here about putting counterweights on the rear to make them grade better. This R5 tractor could use some counterweights to do the same thing.

Jan (my PV 15 sits nice and level!)

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10 years 10 months ago #88103 by drujinin
Replied by drujinin on topic In My Opinion
Winch or Weights would solve the problem.
It is obviously a very early La-Plante Choate setup, so it probably has been on there for a long time.
Bigger question is: "where is the photo of the rear end?"

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10 years 9 months ago #88138 by janmeermans
Replied by janmeermans on topic One more observation
Sorry, but I can't leave this one alone. Looking again to the pics of the R5, note the blade is chained up on the left side in the first picture. The other two pictures indicate the hydraulics have leaked off so the chain has all the weight. That being said, it is also the left rear that is coming off the ground. The third picture shows the right side still on the ground. So, the way she sits, the rear lifting is more pronounced and looks worse than it might if the weight was equally distributed on both lifing points.

If you look through the lists above, you'll see a D4 which also has the lifting mechanism mounter way forward near the front idler. The blade is on the ground to one can't tell how the rear of the tractor sits with the blade up.

Thanks Pete for asking questions and making us think a little bit!

Jan

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10 years 9 months ago #88214 by zip
Replied by zip on topic June Craigslist
janmeermans seems to have got it after looking really close i see the chain, mist it on first go around. My glasses suck!

1929 cat fifteen,1942 cat12 grader,1956 D47u with 4S blade,

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