Service Manual 04/2010 Rev.B
124
Fig.295
7.20 WORM SCREW: CHECK AND
REPLACEMENT
: 2h
: End wrenches 13,19,22mm, socket wrench
22 and 24mm, 13mm tube type wrench,
12mm Allen wrench, rubber hammer, silicon.
L : The defective worm screw may cause the
following inconvenience:
1. Noise during chuck rotation.
2. Mechanical breakage.
TO CHECK THE WORM SCREW:
Turn the machine off and remove the belts
5.9.
Turn the machine on and make a chuck motor
rotation: if it is run normally it means that the
worm screw is noisy and it must be replaced.
TO REPLACE THE WORM SCREW:
Remove the plastic pulley.
Remove the tang #1 and the protection #2,
#3 and #4 (Fig.296).
Fig.296
Remove the chuck motor and place it on the
back side of the chuck arm.
Unlock the nut #1 and unscrew the set screw
#2 of a turn (Fig.297).
Fig.297
Remove all screws #1, #2, #3, #4 and take
away the defective worm screw assy (Fig298).
IMPORTANT: PAY ATTENTION WHEN
REMOVING THE WORM SCREW ASSY:
SOMETIME THERE ARE SHIMS BETWEEN
WORM SCREW SUPPORTS AND CHUCK
ARM BRACKET.
Fig.298
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