I have a 4520 compact year 2005. Left front tire made several pops while pushing some brush piles in 4wd. Took it out of 4wd and no more popping. Made it back to the trailer and loaded up some implements with the forks. On the last trip up on the trailer the left front tire locked up. Searched around and asked a few people and they said it probably was behind the hub in the reduction/cone gear. Looking for a manual at John Deere ,they ordered the wrong one...typical. Can someone tell me where to find the technical manual tm2137 besides the John Deere dealer.they said it was $360.00. I really need the disassembly/reassembly schematic with torque values. Thanks