Wilton 4400A - Manual (Page 10)

10
Maintenance
Belt Replacement
1. Disconnect the power to the machine to prevent acci-
dental start-ups. If the machine is plugged into an outlet,
unplug it. If the machine is hardwired to a branch circuit
with a junction box, remove the fuse or trip the circuit breaker
to the branch.
2. Remove the lock knob and top cover (See Figure 6).
3. Remove the side guard and table.
4. Release the belt tension by turning the tension handle
in a counterclockwise direction (See Figure 7). If the handle
is difficult to turn, perform Track Mechanism Maintenance
according to the instructions following this section.
5. Remove the belt.
6. Check the drums and platen for scoring or signs of
wear which might require service or replacement.
7. Check the height of the platen with a straight edge. If it
is not 1/32 in. above the drums, adjust it according to the
instructions in Platen Replacement or Adjustment in the
Machine Setup section of this manual.
8. Check the drums for looseness which might cause
tracking problems. Correct any loose condition by tighten-
ing or replacing any parts as required.
9. Slip the new belt onto the drums and platen.
10. Adjust the tension handle clockwise until the belt is flat
against the platen and there is no curling or buckling of the
belt in the middle.
11. Turn the drums by hand to see if the belt tracks more-
or-less true. JUST BECAUSE THE OLD BELT TRACKED
CORRECTLY DOES NOT MEAN THE NEW BELT WILL.
Always check the tracking when replacing a belt.
12. To adjust the tracking:
12.1. Plug the machine back into the outlet or
reestablish power in the branch.
12.2. Loosen the tracking lock knob.
12.3. Jog the motor on and off as necessary to
observe the tracking, and turn the tracking knob as
necessary to make the belt track in the center of the
platen and drums. Turn the tracking knob clockwise to
move the belt toward the right and counterclockwise to
move the belt toward the left.
12.4. When the belt seems to be tracking correctly, turn
the motor on and leave it running while fine tuning the
tracking.
12.5. Lock the tracking lock knob.
12.6. When the lock knob is secure, turn the power
off and disconnect the machine from the outlet or
branch as in Step 1, above.
13. Replace the table, side guard, top cover and lock
knob by reversing steps 3 and 2, above.
14. If you have not already done so, reconnect the power
to the machine and return it to service.
Figure 6: Top cover components
Figure 7: Belt adjustment components (Note top cover
removed for removal and replacement of belt.)