As for the enthusiastic crowd remark, I didn't respond since I don't have a 1540. But I did some research and found my tractor uses the same filter as the 1540 so I measured mine to answer your question. Can't easily measure the diameter while it is on the tractor but if it were smaller it wouldn't seal. As for the length, it is the same as the MF dealer filter.
Friends --- I'm soon due for my hydro fluid change and was beginning to secure filters. My MF1540 hydro has 2 hydro filters--one under the left rail and 1 under the right rail of different size. The diagrams show the filter under the right rail perpendicular to the tractor axis. The left one runs parallel to the tractor and smaller that the other in height. I'be looked at the AGCO online catalog but don't see the left one mentioned anywhere. Any insight you can offer?
Years have passed and Heavens gates have opened. I have finally solved the mystery that nobody previously wanted to come forward and share with all mf1540 owners:
The elusive main hydraulic systems filter, is...
Wix 57403
There you have it. That痴 it...
Baldwin BT443 should also fit but it is rated 5 microns vs 12 for the Wix.
I致e got the Wix on and it works great.
Not sure why the silent secret from the pros on this forum not to pass on this information ...