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Recent content by big roller

Yesterday's Tractor Forums
  1. B

    4430 quad shift modification

    Thanks. Will that work for a 4640 quad shift as well?
  2. B

    4430 quad shift modification

    Some years ago I saw a post with instructions on how to modify the shift positions on a 4430 quadshift. It resulted in the 3-4 gears being moved to the 1-2 position and vice versa. Moving the 3-4 gear shift close to the 1-2 reverse gears is much more loader friendly. Then the reverse is the same...
  3. S

    Ross master pump

    <image src="http://forums.yesterdaystractors.com/photos/mvphoto9336.jpg"/> I would like to know what the secret is to installing the pump driveshaft seals on a little Rosa master pump for my 1845 case. Had the pump rebuilt and now I got fuel in my engine oil. Seals were done by my buddy when he...
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    Gear Ratio does not match manual specs

    The manual states that all 1855s had the 7/44 bevel gears in the rear which are supposed to give 29 driveshaft revs per 2 rear tire turns. I have counted the revolutions over and over but I always get 29.5. My 1855 Oliver is a 1974 sn 247-865-xxx, one of the later ones (it has the pump for the...
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    Oliver 1855 mfd all the numbers for gear ratios, tires

    Well that throws a wrench into my calculations. When you use LR instead of RC it ends up different. RC does not equal 2*(pi)*LR for most tires. I found a simple lead-lag calculator using RC's at Titan https://www.titan-intl.com/en/resources/Lead-Lag-Calculator . The other thing is the manual...
  6. B

    Oliver 1855 mfd all the numbers for gear ratios, tires

    Well that throws a wrench into my calculations. When you use LR instead of RC it ends up different. RC does not equal 2*(pi)*LR for most tires. I found a simple lead-lag calculator using RC's at Titan https://www.titan-intl.com/en/resources/Lead-Lag-Calculator . The other thing is the manual...
  7. B

    Oliver 1855 mfd all the numbers for gear ratios, tires

    Which shop manual is this? I have not seen this chart in mine. I wish your picture was clearer.
  8. B

    Oliver 1855 mfd all the numbers for gear ratios, tires

    I got some charts and finally found the specs for Goodyear dyna-torque II bias tires. The rolling circumference is actually 209" and the static loaded radius is 32.28". From my measurements it looks like the lead for the current tires is around 7%. If I switched to 20.8 rears it would be about...
  9. B

    Oliver 1855 mfd all the numbers for gear ratios, tires

    The previous front tires went bald after a some years but we did use it in 4 wd alot so I don't know if it is premature or not.
  10. B

    Oliver 1855 mfd all the numbers for gear ratios, tires

    A little more info. we have a fork on the back and an Allied 790 loader on the front. Much of the time we carry 2 bales (one bale at each end). The manufacturer BKT recommends 22 to 30 psi with a max of 35 for their tires on the front. Because of the weight we have been running them at the max...
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    Oliver 1855 mfd all the numbers for gear ratios, tires

    I am re posting my question for my Oliver 1855 with MFD. I still want to work out the correct calculations for the % lead/ lag. Here are all the numbers When one side of the tractor is raised with the mfd engaged: The driveshaft turns close to 29.50 times for 2 turns of the rear tire and 20...
  12. B

    MFD gear ratios and tires re: Oliver 1855

    No, with one wheel up you just have to rotate the tire twice to get the right count on the driveshaft.
  13. B

    MFD gear ratios and tires re: Oliver 1855

    I have an Oliver 1855 with MFD. I want to work out the correct calculations for the % lead/ lag. Here are the numbers for mine When one side of the tractor is raised with the mfd engaged: The driveshaft turns close to 29.50 times for 2 turns of the rear tire and 20 turns for 2 turns of the...
  14. B

    rear drive ratio

    Sorry, I was referring to the rear part of the tractor with the Big tires. True as you said for the front diff it did have a tag but the ratio on it was wrong. It said 24-1 but it is definitely 20 rotations to one. Now I want to make sure I get the rear ratio right.
  15. B

    rear drive ratio

    I have an 1855 Oliver with mfd. I was wondering how many times is the driveshaft to the front supposed to rotate during 1 revolution of the rear tire? With help and while in 4 wheel drive, I counted 29.5 while the tractor drove ahead for 1 revolution of the rear tire. I was wondering if I used...
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