John Deere 40 Series Block Numbers
Location of Number

Click on any image to see the full-size picture.

<== To find the block number of your JD 40 series tractor, look for the flange on the engine block below the gerator and directly behind the hydraulic pump. If you can't see any number, it is either covered with paint and/or dirt, or you have a replacement engine.

<== Here is a close-up of the block number on my tractor.