Disc mower
76
GMD883
Maintenance and storage
Knife replacement
Clean the nut case.
- Place a wooden wedge between two discs to stop
them from rotating.
- Loosen nut using box spanner supplied with the
machine.
- Remove bolt through opening located at the front of
the disc guard.
- Knives can be turned over on the same disc to use the
other cutting edge or replaced. On each knife, an
arrow indicates the disc's direction of rotation.
- Make sure that the securing nut and bolt are in good
condition and if necessary, replace them.
- Torque knife locknut to 12 daN m (89 lbf ft).
Dull knives require more horse power and have a
negative effect on the cut quality.
Disc replacement
- Place a wooden wegde (2) between two discs to stop
them from moving.
- Remove 2 bolts (1) and their spring washers using the
box spanner supplied with the machine.
- Remove the disc conical cover.
- Remove the 2 other nipple-screws and their spring
washers.
- Remove the disc.
When remounting:
- Position their largest diameters at right angles to each
other.
- Position conical centre of spring washer at the top.
- Torque bolts to (1):
• Torque: 12 daN m (89 lbf ft).
Replace knife lock-nuts and bolts when they
have been removed 5 times.
Replace systematically all worn or distorted
knives. Never straighten a bent knife.
Always replace both knives per disc.
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