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John Deere

John Deere Heavy-Duty Flail Mower 390

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John Deere Heavy-Duty Flail Mower 390
John Deere Heavy-Duty Flail Mower 390

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Manual for John Deere Heavy-Duty Flail Mower 390

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John Deere Heavy-Duty Flail Mower 390

John Deere Heavy-Duty Flail Mower 390

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Maintenance Plans for John Deere Heavy-Duty Flail Mower Model 390

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Mower to Tractor with Three-Point Hitch Maintenance

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

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Extend tractor telescoping draft link ends (if equipped)

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

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

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Shut off engine and remove ignition key

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

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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)

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Start tractor engine

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

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As Required Maintenance

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Driveline Shields Check

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Hitch Pin Torque Check

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

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

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Sign off on the maintenance

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Gear Case Replacement

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Loosen driven shaft bearing mounting bolts (A)

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Remove bolts (B) from driven shaft shield support

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Remove PTO driveline shield (C) by removing (4) bolts (D)

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Loosen (4) Support bolts for gear case (E)

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To release bolt heads, slide the gear case forward in the grooves

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Pull up the gear case towards the opposite side of the driveshaft

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Apply multipurpose grease on output shaft of gear case

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Tighten bolts to specifications

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Install PTO driveline shield (C) on the correct hole locations (F) as illustrated

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PTO Driveline and Rear Safety Deflector Replacement

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Apply multipurpose grease on the input shaft of gear case

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Align splines by rotating mower driveline

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Pull locking collar (A) and simultaneously push driveline onto the input shaft of gear case until locking device engages

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Pull back on shield (B) to make sure that driveline is locked

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Attach PTO driveline shield chain (C) to a fixed point on mower

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Install rubber if equipped safety (A) deflector to the inside of the mower mainframe using provided hardware

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Tighten all mounting hardware after deflector installation

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Sign off on the PTO Driveline and Rear Safety Deflector Replacement

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Knives Inspection

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Warning: Ensure the mower is turned off and unplugged before starting the inspection

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Knives are undamaged

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Knives are not worn

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Measure the knife hole for the securing ring

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Knife hole for the securing ring is not worn by more than 3.2 mm

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Upload a photo of the knives

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Sign off on the knives inspection

Run this procedureArrow right

Parts for John Deere Heavy-Duty Flail Mower 390

Access the parts list for your equipment in MaintainX.

Part Name
Part Number

Sway Chain

LX001802

Sway Chain

LX001802

Sway Chain

LX001802

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