Near Intersection of I-35 & I-90 Southern Mn. | GM Guy - 9/17/2025 13:28
Tractor duals are industry standard. Combine duals in the 90s without planetaries was a bastard pattern unique to John Deere.
This reminded me of a wheel problem with a Deere combine. I purchased a used Deere combine from a local dealer. It was equipped with factory duals the way it was traded in. It was delivered to me and I measured the driver spacing. Something just wasn't right.
Turns out Deere had rims with different amount of "dish" to them. There's a shallow and a deeper version. Deere also had a spacer that could be bolted between in various places to change the spacing. After a closer inspection it turns out that "my" combine had 3 wheels of one type of dish and 1 of the other type. The solution was to remove all the wheels and rearrange them a bit and use a spacer on one side. The result was the main drivers and the duals were then centered on the combine.
The explanation was that when the combines were shipped in, the wheels were shipped loose on the truck and stored against the building. Whoever installed them used a mismatched pair. The proper fix for my combine would have been to swap out the incorrect wheel but one was not available. Using a spacer in effect changed one of the shallow dish types to a deep dish type which corrected the effective spacing. I suspect there is another combine out there with the opposite mismatch.
Edited by tedbear 9/18/2025 08:02
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JD 10bolt pattern
