4x2 brakes

I just purchased my first gator. Brakes seem like they need to be adjusted! But there isn't much thread left. I'm trying to find an operators manual but the previous owner had no idea what year it is. All I have is the serial number and the bed says 4x2.

Could someone help me decode this number?

w004X2X035989

Thanks in advance! I'm sure ill be a regular on the forum, gator needs some work!