Travis

Found this manual as a free pdf downloaded, it's loaded with information.
My Windows Defender Scanned it and it's clean of anything you wouldn't want on your PC.

This is a complete service manual for the Kawasaki Mule 500,520 and 550 models.
Topics  covered include Brakes, Steering, Electrical system, suspension and fuel system. As well as engine repair procedures and Transmission/Final Drive procedures.
 
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If you need more information about the engine this manual linked below is chock full of information.
Thanks goes to @cliffyk for getting these files all  into one PDF format for uploading.

This file contains all specifications,troubleshooting and repair procedures for the FE290D  (9.5H.P,286cc) engine used in the  Mule 500,520 and 550 models.
Topics covered include,  general information, service data, disassembly, reassembly,inspection of parts and maintenance.
Notes:
Make sure you're reading the correct information as this manual covers multiple FE series engine, some of which were not used in Mules, the manual does a very good job of clarifying which specifications and procedures are for which Model engine.