M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
PAGE
ISSUE
48
A_November 2012
3.5.3
ROTOR
HEAD
DISASSEMBLY
(See
Fig.
3.5/1
‐
3.5/2)
WARNING
DANGER:
Carefully
follow
the
instructions.
Magni
Gyro
is
not
responsible
for
damages
caused
by
changes
and/or
modifications
that
are
either
unforeseen
or
done
with
non
‐
original
parts.
1.
Before
starting
this
operation,
verify
that
the
engine's
ignition
key
and
push
‐
button
are
in
OFF
position
and
that
all
the
breakers
are
switched
OFF;
2.
To
facilitate
the
disassembly
of
the
rotor
head,
put
the
control
stick
(2)
in
all
‐
forward
position;
3.
Unscrew
and
remove
the
two
bolts
M6x16
that
fix
the
sheath
pn
119
of
the
flexible
shaft
to
the
pre
‐
rotator
pn
117
(use
a
10
mm
wrench);
4.
4Extract
the
sheath
pn
119
and
the
flexible
shaft
pn
118
from
the
endings
on
the
rotor
head
pn
039
and
pn
040;
5.
Loosen
the
rotor
brake
cable
pn
1,5x3900
from
the
cable
retainer
pn
202
of
the
brake
lever
pn
201
(use
a
10
mm
wrench);
6.
Extract
the
cable
pn
1,5x3900
of
the
rotor
brake
from
the
sheath
retainer
pn
200
of
the
rotor
head;
7.
Mark
the
fastening
position
of
the
trim
spring
pn
109;
8.
Loosen
and
remove
the
spring
catch
pn
110
that
fixes
the
spring
pn
109
of
the
trim
(use
a
7
mm
wrench);
9.
Disconnect
the
connector
of
the
sensor
pn
238
from
the
cable
‐
wiring
pn
239;
10.
Unscrew
and
remove
the
nuts
pn
MS
20365
‐
428
of
the
bolts
pn
AN4x16A
that
lock
the
rod
ends
pn
034
of
the
control
rods
to
the
rotor
head;
11.
Remove
the
bolts
AN14x6A
of
the
rod
ends
pn
034.
Take
care
not
to
scratch
or
damage
the
paint
of
the
rods,
especially
when
these
get
disconnected
from
the
rotor
head;
12.
Remove
the
safety
pin
pn
AN
416
‐
1
from
the
longitudinal
bolt
pn
NAS
628
‐
52;
13.
Unscrew
and
remove
the
nut
pn
MS
21083
N8
of
the
longitudinal
bolt
pn
NAS
628
‐
52
of
the
head;
14.
Holding
the
rotor
head
by
the
fork
pn
046
to
which
the
trim
spring
pn
109
is
fixed,
extract
the
bolt
NAS
628
‐
52;
15.
Remove
the
rotor
head
from
the
fork
pn
051;
3.5.4
ROTOR
HEAD
INSTALLATION
(See
Fig.
3.5/1
‐
3.5/2)
1.
Before
starting
this
operation,
verify
that
the
engine's
ignition
key
and
push
‐
button
are
in
OFF
position
and
that
all
the
breakers
are
switched
OFF;
2.
To
facilitate
the
assembly
of
the
rotor
head,
put
the
control
stick
in
all
‐
forward
position;
3.
Before
installing
the
rotor
head,
abundantly
grease
the
bushes
pn
053
in
which
the
longitudinal
bolt
NAS
628
‐
52
will
be
inserted;
4.
Put
the
rotor
head
in
correct
position
by
inserting
the
upper
fork
pn
052
into
the
lower
fork
pn
051;
5.
Insert
the
washer
pn
12x24
into
the
bolt
NAS
628
‐
52.
Pay
attention
to
put
the
bevelled
part
against
the
bolt
head;
6.
Respecting
the
direction
of
insertion
along
the
longitudinal
axis,
i.e.
from
rear
to
front,
insert
the
bolt
pn
NAS
628
‐
52
into
the
fork
pn
051;
7.
Take
the
grease
in
excess
that
came
out
while
the
NAS
628
‐
52
bolt
was
inserted
and
spread
it
on
the
notched
gear
teeth;
8.
Tighten
the
nut
pn
MS
21083
N8
on
the
bolt
NAS
628
‐
52;
9.
Reposition
the
control
rod
ends
in
the
apposite
head
forks
and
insert
the
bolts
AN4
‐
16A
with
their
washers;
10.
Tighten
the
bolts
AN4
‐
16A
with
the
nuts
pn
MS20365
‐
428,
which
in
any
case
should
be
replaced;
11.
Connect
the
wiring
cable
pn
239
with
the
detector
pn
238;
12.
Insert
the
spring
catch
pn
110
in
the
apposite
hole
along
the
fork
pn
046
of
the
rotor
head;
13.
Tighten
the
spring
catch
pn
110;
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