Servicing Disk Gangs

causym CAUTION: When removing disk gangs, use suitable lifting devices or support stands to prevent serious injury or death to you or others. Block disk gang to prevent rolling. Wear gloves and other safety equipment.

NOTE: Bearing standards are attached to gang frames at factory. They are positioned on frame for best machine operation.

To maintain factory-set position, do not loosen or remove disk standard nearest to center of machine.

Guidelines to determine when to change disk blades. Generally a disk blade will begin to lose its effectiveness for leveling and penetration when it has worn down past 15 to 20% of it's original size. The following examples are blade sizes which would be worn down enough applying general rule for changing blades:

Original Diameter Replace Disk When
Diameter is:
508 mm (20 in.) 406 to 432 mm
(16 to 17 in.)
559 mm (22 in.) 470 to 483 mm
(18-1/2 to 19 in.)
609 mm (24 in.) 495 to 508 mm
(19-1/2 to 20 in.)
660 mm (26 in.) 521 to 533 mm
(20-1/2 to 21 in.)

 

IMPORTANT: Disk blades will wear differently depending on soil conditions and proper operation and these guidelines have nothing to do with John Deere disk blade warranty policy.

1. Remove nuts and cap screws fastening disk gang bearings to gang standards.

2. Raise frame slightly to roll disk gang away from machine.

3. Block gang to prevent rolling. Support main frame.

4. Use gang wrenches to loosen gang nuts. (See TIGHTENING GANG BOLT in this section.)

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