Figure 4-88. Outside Spanning Tool

Figure 4-88. Outside Spanning Tool

g . Lower inner rail until the upper and lower

(see figure 4-85). Some clearance must he evident

rollers are exposed as shown in figure 4-86.

but not to exceed 1/32 inch. Record actual

clearances measured and determine the number of

shims required under the roller to bring clearance

h. Remove the right and left hand upper rollers

into the 1/32 range. Write this number on the inner

and count the number of shims used with each.

r a i l (bottom rollers) or outer rail (top rollers),

i. Refer to the numbers previously recorded on

adjacent to the roller.

the outer rail. The smallest of these numbers

represents the number of shims to be added behind

d. Raise inner rail to 1/2 full up position. Check

r o l l e r clearances as in step c (figure 485) and

the roller.

record number of shims needed to adjust clearance.

j. Ideally, there should be the same number of

For top rollers, record number on the outer rail.

F o r bottom rollers, record number on the lower

shims behind each of the upper rollers. If, however,

rail.

an extra shim is required behind one of the rollers,

do not remove it. Mark the outer rail, on the side

e . Raise inner rail to its full up position and

having the extra shim, with a plus one (+l).

repeat roller clearance check, recording numbers

on the inner and outer rails as before. There will

k. Repeat steps h, i and j on the bottom rollers.

now be 3 numbers recorded on the upright rails

If an extra shim is required on one of the bottom

adjacent to each roller.

rollers, it must be installed on the same side as the

extra shim (if needed) on the top roller.

f . Lower inner rail part way and remove stop

block from top of inner rail

1. After roller adjustment is made and all rollers

4-61