Specifications

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• Appendix D Users Manual Model 686 / 686 HT
• There should be a .010-.020 gap (for roller clutch only) between the two clutch pieces.
• (Test on the solenoid test box.) The knife must cut both fabric and card stock. The solenoid
should operate on both the high and low settings.
• Excessive motor drag must be minimal at start / stop and while running. Replace or repair
problem component. On old knife assemblies, there are bronze bushings in outer support. They
may be causing a bind. Ream bushing and retest. (Do not ream if it is a roller bearing.)
• (Rev 1) Pre-load setting adjustment. While motor is running, not while cutting, loosen set
screws on “Pac-man” and rotate the rotary blade clockwise, mark the stopping position on the
“Pac-man”, rotate counterclockwise, mark the “Pac-man”, then rotate the blade to the middle of
the two marks and tighten the set screws.
• (Rev 2) All new knife assemblies have a blue clutch. The clutch outer race bushing has an I.D.
of .500 and the 2 extension springs are .012-dia wire.
• (Rev 2) The 2 extension springs on all rebuilt clutches must have the .009 Dia. wire springs
replaced with .012 wire springs.
• (Rev 5) Replace Knife Actuator 357020, if it is worn or if there is a “bulge” at the 90-degree
bend.
• (Rev 6) Changed feeler gauge tolerance from .047 MIN