L3750 gearing

[ctmike]

How did you figure that? Do you have the gear ratio for the tractor? I havn't found it in the WSM.

I found the formula on another thread on this forum, and had to find the rolling circumference of my tires on a tire manufacturer website. I can't remember which one because I did the math awhile ago, but if you google "how do I find the rolling circumference of tractor tires" you'll come up with something.

 

[jsmootz]

Rolling circumference has been pretty well established. The front/rear gear ratio of an L3750 is the only part I am missing.

 

[ctmike]

Rolling circumference has been pretty well established. The front/rear gear ratio of an L3750 is the only part I am missing.

OK, I checked on my original math and here's what I came up with.

To find the "gear" ratio of front to back, take the rolling circumference (RC) of the front and divide it by the RC of the rear.

Then I checked the ratio of the stock tires for the L3750DT, which were
Front=8.3-16 R1 RC=94"
Rear=12.4-28 R1 RC=136"
94 divided by 136=.69 This is the "gear" ratio as stock.

Now I checked the ratio of my optional tires for the L3750DT, which are
Front=9.5-16 R1 Power Torque RC=100"
Rear=14.9-24 R4 Industrial Sure Grip RC=145"
100 divided by 145=.689 This is the gear ratio for the optional tires, which is also the same as the stock set-up.

So, the optional tires have the same ratio front to back as the stock tires and we are good to go!

 

[jsmootz]

Comparing ratios of optional tires to OEM size is OK but there is still no reference to the tractor ratio.

I just want that magic tractor gear ratio so I can effectively plot the percentage of over-run/under-run of the front tires.