Husqvarna 6690 Manual page 19

The gap between the hook and the needle
Requirements
Remove the hook cover.
Connect the machine and turn on the main
switch. Insert the service needle No.
411 5818-01 into the needle bar. Lay the
machine on the table on its back.
When the tip of the hook is in front of the
centre of the needle, as shown in the
illustration press the hook against the
driver. The gap between the needle and
the hook should be as small as possible.
Insert the setting needle No. 411 5800-01
in the needle bar and check that the hook
can pass. If the point of the hook contacts
the needle the gap is at max. See Fig 2.
Comments
The hook comes into contact with the needle at point
A, picture 3, i.e. the part of the hook which is under the
tip of the hook, the so-called needle support. The hook,
furthermore, is made in such a way that the top lies
appr. 0.05 mm in front of this needle support.
To enable the thread loop to go between the hook
and the driver, according to illustration 4, a
certain axial movement must be possible.
Contact between needle and hook can therefore
result and this causes a sound, which can be
heard if the machine is running without thread.
This contact damages neither the hook nor the
needle, as long as a needle with a groove
according to system 705 H is used.
Adjustment
Setting according to Requirements.
Turn the handwheel until the needle is at the
highest position. The slot in the driver is now in
the middle, underneath the feed dog. Undo the
Setting View B
needle Scale 2:1
Gap
three screws (9/16) which hold the hook
cover-remover the hook cover and the hook.
Then undo the three screws (9/11) in the driver,
(9/10) and remove it. The position of the
driver is adjusted by removing or adding one
or several washers (9/8). Note the position
of the slot in the driver. Then check "The
gap between the driver and the hook cover".
Spare parts: See RA, page 9!
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