Using Bumper Blocks

Bumper blocks (A) are located on draft arms and are used to limit amount of hitch sway.

Loosen lock nut (B) and slide bumper block (A) forward or rearward as necessary. Tighten lock nut.

NOTE: If there is not enough adjustment in bumper/spacer blocks to take sway out of hitch, install shims as necessary between bumper/spacer blocks and draft links. Fabricate shims to fit inner curved wall of draft link pocket or see John Deere dealer to purchase shims through service parts. Shims should be made flat and formed to fit tight as bumper block cap screw is tightened. Do not add shims behind sway blocks as it may not allow wedge plate to properly brace bottom end of way blocks.

NOTE: 4559 kg (10,050 lb) Hitch-7720 and 7820; Hitch draft arms can be equipped with either Category 3 or 3N bumper blocks. If tractor was ordered WITHOUT a quick coupler, it has Category 3N (thin) bumper blocks. If tractor needs to be set up for Category 3 applications, thicker bumper blocks are needed. Order from Service Parts. If tractor is equipped WITH factory installed quick coupler it has Category 3 (thick) bumper blocks. If converting quick coupler to Category 3N from Category 3, thinner bumper blocks are needed. Order from Service Parts.

Category 3 hitch shown. To convert hitch from Category 3 to 3N:

• 4559 kg (10,050 lb) Hitch-7720 and 7820: Replace bumper block with a thinner block. (Order from Service Parts.)
• 6350 kg (14,000 lb) Hitch (All) and 4559 kg (10,050 lb) Hitch-7920: Move spacer (C) to outside of draft link.

A-Bumper Block
B-Lock Nut
C-Spacer

OUMX005,000173A -19-25AUG03-1/1