Stiga MPV 320W Workshop Manual page 37

WORKSHOP MANUAL
MPV 320W / 520W
A badly sharpened blade causes grass to be-
come yellow and reduces grass collection capa-
bility; if not balanced, excessive vibration can be
caused during use.
Sharpen the cutting edge of the blade, using a
medium grade grinder.
IMPORTANT Sharpening must only be per-
formed from the side shown in the diagram, re-
moving as little material as possible.
The blade is to be replaced when the cutting edge has worn down to 10 mm.
IMPORTANT To maintain the balance of the blade holder disc, check that the difference in weight
between the two blades after sharpening does not exceed 5 grams.
IMPORTANT In case of replacement, it is always advisable to replace both blades. The replace-
ment blades are supplied in pairs, or are already assembled on the disc; bear in mind that the unit
and the right side blades are different from those of the left.
When assembling them, repeat the operations described above in the reverse order, taking care
to:
• Observe the blade assembly direction (6) on the disc, with the tabs pointing toward the inside
of the cutting deck and the cutting edge consistent with the direction of rotation, and replace the
bolts in the indicated sequence.
• Tighten the nuts (5) with a torque of 70-80 Nm
using a power screwdriver and a torque wrench.
• Replace the two blade holder discs (3) respect-
ing the direction of rotation, and ensuring that
the blades are oriented at 90° to each other; to
this end, use the slots (7) present on the plate
(2) that allow sufficient possibility of rotation to
provide the optimal condition.
• Tighten the nuts (1) with a torque of 30-34 Nm
using a power screwdriver and a torque wrench.
90°
3
Chapter
6 - CUTTING DECK AND COLLECTION
3
6
1
1
EDITION PAGE
2017 37 /
64
max 10 mm
5
2
7
1