IBM 1403 Field Engineering Maintenance Manual page 19

()
.095"- .118"
Door Opening
Figure 13. Jam-Detection Switch Adjustment
2. Position the right fonns tractors in the correspond-
ing holes in the face of the movable slides.
3. Place a fonn in the fonns tractors.
Check the position of the upper drive shaft to the
lower tractor drive shaft. The fonn must fit in the trac-
Straightedge
b
~h
3/32" ~ 1/32"
C.~_ ..... ~~'./
Figure 14. Tractor Door Opening Limit
tors with a minimum slack in paper. Feed the forms
manually and check for no elongation of the pin-feed
holes (this may occur under power).
The upper tractor pins should touch the upper edge
of the pin feed holes in the form. The lower tractor.
pins should touch the lower edge of the pin feed holes
in the form.
If fonns are tighter on one side than the other, ad-
just the left end of the upper mounting bar by means
of the eccentric washer (on current machines). See
Figure 8.
If necessary, adjust the upper tractor shaft drive in
relation to the lower tractor drive shaft.
1. Loosen the upper tractor shaft drive gear.
2. Manually rotate the shaft to remove slack.
3. Clamp the drive gear to the shaft.
Replace any remaining parts in reverse order.
Tractor Installation
This procedure refers to both the upper and the lower
assembly. Place the tractor shaft and the mounting bar
in relative positions on a flat surface.
Install the tractors on the drive shaft.
1. Slide the drive shaft through the square drive hub
on the right tractor.
2. Turn the left tractor drive until the pins line up
with those on the right tractor and, at the same
time, the drive hub lines up with the drive shaft.
Note: These pins line up at only one point during one
revolution of the drive shaft.
3. Slide the drive shaft through the square drive hub
on the left tractor.
Install the tractors on the mounting bar. Slide the
mounting bar through right and left tractors.
Tractor-Shaft and Mounting-Bar Replacement
Place the tractors, the mounting bar, and the tractor
shaft in the machine.
1. Set the assembly in the machine.
2. Insert the screws in the slide retainer plate and the
mounting bar at the left and turn the screws in a
few turns.
3. Insert the holding screws at the right end of the
mounting bar and turn in until nearly snug.
19