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Page 19
3. Checking and Securing Flats and Screws
Figure 3.1
The HQ Sweet Sixteen has been designed using fl ats and special screws to help prevent loop lift timing from slipping,
except at the hook. (If the hook cannot slip then something has to break when something goes wrong.
The hook is
designed to be adjusted without removing the front cover.)
First check the torque specifi cations chart on page 5, then
check the following locations, making sure that the fi rst
screw of a timed component has been fi xed fi rmly on the
respective fl at on the shaft:
1. The Pitman crank
(Figure 3.1) (# 5 slotted screwdriver)
2.
The take-up lever driving link,
(Figure 3.1) (3 mm
handle Allen)
3. The main shaft timing pulley
(Figure 3.2) (2.5 mm
handle Allen)
4. The hook-shaft timing pulley
(Figure 3.4 on page 20)
(2.5 mm handle Allen)
.
5. Trust collar on slanted fl at.
Note: The screws are generally positioned 120 degrees
apart. When the fi rst screw (Position 1) has been located
and tightened on a fl at, the second screw is then tight-
ened, compounding the tightness of the fi rst screw, thus
securing and assuring that timing will not change.
Note:
The thrust collar fl at is inclined. The left screw will
tighten onto the inclined fl at. The collar is a wide collar
with two in-line screws. The fi ne fi nish of the collar goes
against the thrust washer and bearing. The left screw clos-
est to the bearing is provisionally tightened and the right
screw is then fully tightened. Finally the left screw is fully
tightened. Check to make sure the main shaft has mini-
mal to no play and that the collar tightening procedure
did not create a tight main shaft condition. If so, readjust
the collar again.
Take-up Lever Driving Link 1
st
screw
Figure 3.3
1
st
screw Main
Shaft Timing
Pulley on fl at
Flat
Pitman Crank 1
st
screw
Thrust Collar on Slanted Flat
