John Deere Heavy-Duty Flail Mower 390

Place draft control lever fully forward to the position marked "OFF" (A) for no draft sensing

Extend tractor telescoping draft link ends (if equipped)

Back up the tractor to mower with hitch points approximately in alignment

Engage tractor park brake and/or place transmission in "Park"

Shut off engine and remove ignition key

Remove center link mounting hardware and hitch pin assemblies at both hitch masts

Align draft links with hitch masts and install hitch pin assemblies according to the tractor hitch category. (See POSITIONING HITCH PINS in Preparing the Mower section)

Carefully back up tractor making sure both left and right draft link ends lock

Visible deformation found on fasteners

Lock nuts have lost their locking ability

Wear on rings or mounting clips is excessive

If any of the above checks fail, replace the fasteners

Sign off on the knife fasteners inspection

Keeping Mower Clean (Every 10 Hour or Daily)

Drive Pulley Bearing and Gauge Roller Bearings (Every 50 Hour)

Warning: Ensure the mower is turned off before starting the procedure

If the mower is not turned off, turn it off and then proceed

Is the top bolt (B) removed from each end of the roller mounting?

Is the lower bolt (C) in each end loosened?

Enter the desired cutting height (in mm)

Is the roller positioned for desired cutting height according to chart?

Sign off on the cutting height maintenance

Check hitch pin lock nut (A) on pivot plate periodically to be sure that it is tight.

Tighten to specifications. (See CAP SCREW TORQUE VALUES in Specifications Section)