Challenge CHAMPION 305 TC, Instructions And Parts Manual

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12.0 Adjustments
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12.15 Knife Bar Gibs
The knife bar gibs are two steel-backed UHMW plates located near the left and right ends of the knife
bar that press on the knife bar’s front surface as it travels up and down. If adjusted too tight the knife
may not come down smoothly and/or scoring may occur which could damage the knife bar and gibs.
If too loose, you could get uneven or inaccurate cuts.
There are three socket set screws with jam nuts located on each side of the cutter’s frame that are
used to adjust the gibs (Figure 44). These should be adjusted only when the knife bar is directly
behind the screws being tightened.
Figure 44
To adjust:
1. Start the machine and make a cut. When the knife is half way down, have someone turn off
the machine. The knife bar should be stopped half way across the gibs.
2. Loosen all (6) jam nuts on the gib adjusting screws and back the screws out 1/2 turn.
3. Adjust center (2) screws until snug, not tight, in order to eliminate the air gap between the
knife bar and gib. Then tighten those (2) jam nuts.
4. Turn on the machine and send the knife all the way down using the “Knife Change” feature
found in the Maintenance pull-down menu. Turn off the machine.
5. Adjust the bottom two screws the same way the middle screws were adjusted. Tighten the
jam nuts.
6. Turn on the machine. The knife should return to the up position. Shut the machine off.
7. Adjust the upper (2) gib adjusting screws and tighten the jam nuts.
8. Turn the power back on and cycle the knife several times. Recheck the gibs (repeat steps 2-6
as necessary).
9. Don’t over-tighten the gibs.
10. If the knife bar and gibs get scored, remove only the burrs by scraping and then sanding
smooth.