Robin
850
Workshop
Manual
Supplement
The
clutch
Section
H
Routine maintenance
The recommended service interval for
checking and adjusting the
clutch on the
Robin
850 is 6,000 miles (10,000km).
Clutch fault diagnosis
A clutch lining, in service,
will
develop a
'polished' surface. This should not be confused
with
a 'glazed' surface, which may be due
to
a
film deposit, a condition that alters the
frictional value
of
the linings. When a
'polished' surface is in perfect condition
it
is
a medium
brown
colour.
If
for any reason oil
should
gain access
to
the clutch and come
into contact
with
the facings, small quantities
will
burn
off
due
to
heat generated by the slip
which
occurs under normal starting
conditions. This
has
the effect
of
darkening the
facings. However,
as
long
as
the 'polish' on
those facings remain such that the grain
of
material can be clearly distinguished.
it
has
very little effect on clutch performance.
Increased quantities
of
oil or grease. however.
can give rise
to
harmful conditions. One
of
two
conditions may arise, or even combinations
of
both. .
(a) The oil may burn
off
and leave a carbon
deposit having a high
'glaze', causing clutch
slip.
In general,
this condition hides the grain of
the
lining material.
(b)
The oil may only burn partially. This leaves
a resinous deposit producing a fierce clutch.
It
may even cause a 'spinning' clutch due
to
the
facings adhering
to
the flywheel or the
pr~ssure
plate surfaces.
A
clutch
that
has been misused
by
the driver
riding the
clutch, or using the clutch pedal
as
a
footrest, is often
easily diagnosed by the clutch
lever
bearing plate having a tendency
Jo
be
blue in colour.
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