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English-37
REPAIRS
assembly is supplied with an “O” ring (47) .
The “O” ring must be removed before the
pulley is fitted.
Replacing Bearings
The fitting procedure is the reverse of the
removal procedure.
Tightening torques:
• Blade bolts 122 Nm (90 lb/ft).
• Pulley bolts 61 Nm (45 lb/ft).
Sharpening and Balancing Blades
• Remove the blades.
• Check that the blades do not have cracks
or any other damage. If they do, scrap
them.
• Clamp in a screw vice (see diagram) and
file until sharp.
Balancing is as follows:
• Fix a mandrel (for example) horizontally
in a screw vice (see diagram).
• Push a blade onto the mandrel and
check that it is evenly balanced. The
diagram shows a blade which needs
adjusting. This blade should be ground at
the edge indicated by the straight arrow.
• The fitting procerdure is the reverse of
the removal procedure.
The tightening torque for the blade bolts
is 122 Nm (90 lb/ft).
6012-088
Grinding a blade
WARNING!
Blades with any cracking must
not be used. Do not straighten
a damaged blade if there is any
danger of crack formation.
6012-089
Balancing a blade