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Adjusting Half Nut
The half-nut mechanism can be adjusted if it
becomes loose from wear. The half nut is mounted
in the ways with a gib exerting pressure between
the components to reduce sloppy movement. The
half-nut gib is a flat bar-type gib, similar to the
saddle gib, and is tensioned with two set screws.
Tools Needed
Hex Wrench 4mm .............................................. 1
Hex Wrench 5mm .............................................. 1
Open-End Wrench 13mm .................................. 1
To adjust half nut:
1.
DISCONNECT MACHINE FROM POWER!
2.
Disengage half nut and remove thread dial.
3.
Loosen hex nuts on set screws shown in
Figure 148.
Set
Screws
Figure 148. Half nut gib set screws.
4.
Tighten each set screw approximately
turn, then retighten the hex nuts without mov-
ing the set screws.
5.
Move carriage handwheel until half nut can
fully close, then open/close half nut several
times and notice how it feels. The half nut is
correctly adjusted when you feel a slight drag
while opening and closing it. It should not feel
too stiff or too loose.
6.
Repeat Steps 3–5, if necessary, until you
are satisfied with half nut adjustment, then
re-install thread dial.
Model G0791 (Mfd. Since 9/15)
After initial break in, the V-belts stretch slightly
and seat into the pulley. It is important to check
and adjust them to compensate for this initial
wear. Check the tension thereafter on a monthly
basis. If the belts become excessively worn or
damaged, replace them as a matched set.
Qty
Tool Needed
Hex Wrench 17mm ............................................ 1
Tensioning V-Belts
1.
2.
3.
Half Nut
⁄
of a
1
8
Figure 149. Locations of motor mount hex bolts.
4.
Tensioning/
Replacing V-Belt
DISCONNECT MACHINE FROM POWER!
Remove end gear cover.
Loosen motor mount hex bolts (see Figure
149).
Note: It may be more convenient to access
the motor mount hex nuts if you first remove
the rear splash guard.
Push down on the motor and re-tighten the
mounting hex bolts.
Qty
-89-
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