IBM 6400 Maintenance Information Manual page 383

10. Position the elevator assembly at the bottom of the vertical rails. (See
Figure 75a.)
11. Position the stacker assembly slightly to the right in order to clear the air
exhaust duct, insert the vertical rails inside and under the upper frame
cross-member, then slowly swing the base of the stacker assembly into
the cabinet. (See Figure 75a.)
12. Work the stacker base rearward and engage the upper brackets of the
vertical rails under the upper frame cross-member. (See Figure 75b.)
13. Align the holes in the vertical rail brackets with the holes in the upper
frame cross-member. (See Figure 75c and Figure 76.)
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