JLG 680S, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
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17. While holding ring gear, input gear, and cluster gears in
mesh, place small side of cluster gears into mesh with
internal gear. On ring gear, locate hole marked ‘X’ over
one of counterbore holes in hub.
NOTE: If gears do not mesh easily or carrier assembly does not
rotate freely, then remove carrier and ring gear and check
cluster gear timing.
18. Install input gear (37) into carrier, meshing with large
diameter cluster gears (18). Counterbore in bore of input
gear must be to outside of carrier assembly.
19. After inserting at least one shoulder bolt in the proper
location, rotate the carrier. Check freedom of rotation
and timing.
20. Install thrust washers and thrust bearing (39, 40) into
carrier counterbore.
21. Place o-ring (22) into cover assembly counterbore. Use
petroleum jelly or grease to hold o-ring in place.
22. Place cover assembly over ring gear with oil level check
plug in cover located approximately 90 degrees from oil
fill plug in hub.