Manual Sharpening of Cutterhead Knives

General

causym CAUTION: Fan and cutterhead may continue to rotate for several minutes after power is shut off. To avoid bodily injury, do not open or remove any doors or shields until all rotating parts have stopped completely.

IMPORTANT: Make sure that cutterhead can rotate freely.

NOTE: Always use the automatic knife sharpening function to sharpen the cutterhead knives. The manual knife sharpening function should only be used in case of malfunction of the automatic knife sharpening.

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Preparations:
  • Move front shield in vertical position or lower harvesting unit to ground.
  • Open upper foldable guard (A) above the cutterhead.
  • Open large foldable guard (B).
  • Pull out locking rod (C) of cutterhead frame.
  • Four-speed LOC: If a kernel processor or power chute is installed, the drive belt must be locked (put out of operation), see Locking Device - Kernel Processor / Power Chute Main Drive (Four-Speed LOC Only) in Sections Kernel Processor or Power Chute.
ZX1029916
ZX1029917

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Fully raise rotor guard (A) by means of switch (B).


A-Rotor Guard
B-Switch

ZX1030923
ZX1035954

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IMPORTANT: Do not remove fixing screw (A)

Loosen cable clamp fixing screw (A) through opening (B) as shown.


A-Fixing Screw
B-Opening for Cable Clamp

ZX1030924
ZX1030925

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Screw locking rod (A) of cutterhead frame into sharpening stone carrier.


A-Locking Rod

ZX1030926

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Four-Speed LOC Only

The two front shift rods (A) on length-of-cut transmission must be in neutral.


A-Shifting Rods

ZX1038587

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Close cutterhead guards (A) and (B).

Start the engine.


A-Guard
B-Guard

ZX020430

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Starting Sharpening Procedure

Engage cutterhead by means of switch (A).

Cutterhead will rotate in reverse direction.


A-Cutterhead Reverse Switch

ZX1033266

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NOTE: If switch (A) is already in "On" position when starting engine, the cutterhead cannot be reversed. Move switch to "Off" position for at least one second and then to "On" position again. The cutterhead will start turning (in reverse direction) after two or three seconds.

Slide the stone at a uniform rate of travel along the full width of the cutterhead (this should take 4-5 seconds).

causym CAUTION: Shut off cutterhead drive by means of switch (A) and engine before checking knives. Cutterhead may continue to rotate for several minutes. Wait for cutterhead to stop rotating before opening guards.

At the end of each R.H. stroke, the ratchet (B) will advance one tooth more to lower the stone.

NOTE: For the last six strokes, only slide the stone without engaging the ratchet (stop when ratchet latch (C) is about 20 mm (0.8 in.) from the ratchet teeth).

Check knives often to avoid excessive sharpening.

ZX1033267
ZX020431


A-Cutterhead Reverse Switch
B-Ratchet
C-Ratchet Latch

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After Finishing Sharpening Procedure
  • Position stone to L.H. side of housing so that cable clamp fixing screw (A) can be tightened through opening (B) as shown.
  • Remove rod and store it back in cutterhead frame (not illustrated).
  • Install cutterhead guards.

IMPORTANT: Adjust stationary knife every time cutterhead knives have been sharpened.

See Manual Stationary Knife Adjustment in this Section.

See Automatic Stationary Knife Adjustment in Section Warning Devices and Monitors.

For calibrations referring to the sharpening stone, see SPF Addresses - SPFH Main Control Unit.


A-Clamp Fixing Screw
B-Opening

ZX1030924
ZX1030925

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