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Extreme Duty Planers -23-
Figure 8. Pressure bar and tension studs.
5. Without bumping the knife edge, carefully
take the pressure bar out of the planer. You
can now access the cutterhead with the knife
setting jig.
6. To prepare the knife setting jig, back all four
of
the screws out of the feet. Adjusting one
screw at a time, set the screw even with the
surface of the jig foot. Turn the screw exactly
2
1
⁄2" turns (this is approximately .071"), or
measure this distance with a caliper. Tighten
the check nut, making sure that the screw
does not move. Adjust the other three screws
by using this same procedure.
7. Place the jig on the cutterhead. If the knife
is
adjusted right, the feet should touch the
cutterhead body on both sides of the knife,
and the knife should barely touch the jig.
8. Repeat this inspection for the other two
knives.
To
adjust the knife set:
1. Before beginning, make sure you have fol-
lowed steps
1-6 from the knife inspection
instructions above!
2. Make sure the planer is disconnected
from the power source!
3. Remove the hex nuts and springs from the
tension studs shown in Figure 8. This will
allow the pressure bar to rotate up and over
the cutterhead.
4. Remove the four bolts that attach the pres-
sure
bar to the eccentric ring.
Pressure Bar
Tension Studs
Cutterhead Knives
The Model G9740/G9741/G9967 features a 4-
knife cutterhead. The knives are factory set to
.071". Unless you are having problems related
to the knives or are removing them for sharpen-
ing/replacement,
assume that your knives are
adjusted correctly. To be safe, always test the
planer with a scrap piece of wood before using
expensive stock.
When adjusting, make adjustments accurate
to within ±.001" from one side to the other.
Improperly adjusted knives can unbalance the
cutterhead and shorten the bearing life, as well as
produce substandard planing results.
Planer knives are danger-
ously sharp! Use extreme
caution when working
near cutting surfaces.
Failure to exercise care
while working near knives
could result in severe
injury.
Figure 7. Engaging cutterhead lock.
To inspect the knife set:
1. Make
sure the planer is disconnected
from the power source!
2. Open the top cover to gain access to the
cutterhead.
Lock the cutterhead in place with
the cutterhead lock as shown in Figure
Cutterhead
Lock