3
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E
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IN
E ASS
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LY AN
D CO
NTRO
LS
Checking wear of forks and gearwheels.
3.4
GEARBoX UNIt: CoNtRoLS
AND REASSEMBLY
The gearbox unit is made up of the gearshift and of
the gearbox itself. The gearshift is then divided into
external and internal gearshift.
The following are the verifications and procedures
for checking and reassembling these units to the
engine.
3.4.1
CHECKING GEARBoX UNIt
Use protective jaws to clamp the primary and se-
condary shaft.
Use a thickness gauge to check the axial play betwe-
en the gearshift forks and the gearwheels. The play
detected must not exceed the service limit indica-
ted below:
service limit: 0,5mm
If the detected axial play is greater, before replacing
either the gearwheels or the forks, check their state
of wear (par. 2.4.4).
Remove the various elements and check that:
•
The support surfaces of the primary and secon-
dary shafts are free of abnormal wear or signs
of seizure.
•
The sides of the teeth are free from chipping or
abnormal wear.
•
The sliding areas of the gearwheels are free
from abnormal wear or traces of seizure.
•
The front claw clutches of the gearwheels are
not chipped or rounded.
•
The roller bearings are intact and efficient.
•
None of the thrust washers show traces of ab-
normal wear or meshing.
Should any of these defects present themselves, re-
placed the concerned parts.
