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Chapter Four – Maintenance Procedures – Base
84
4.6 LIFT UNIT (CONTINUED)
LIFT DRIVE INNER SCREW AND UPPER NUT REPLACEMENT
NOTE
The inner screw can be removed with or without the lift housing cap attached.
8. For Inner Lift Drive Screw (L) replacement, using large snap ring pliers, remove snap ring (G) holding the
inner screw to the lift housing. Push up on the inner screw from the bottom of the outer screw (M) to re-
move.
CAUTION
When reinstalling the snap ring (G), be sure to position it as shown in illustration 1 or damage to the unit could
occur.
To replace the upper nut (H) after removing the inner screw, turn the upper nut off the inner screw. Install
the new upper nut in the same manner. The replacement inner screw will come with the attached upper nut.
LIFT DRIVE OUTER SCREW AND LOWER NUT REPLACEMENT
9. To remove the outer screw (M), while the inner screw is still removed, push the outer screw out from under-
neath the lift housing.
To replace the lower nut (J) after removing the outer screw, turn the lower nut off the outer screw. Install
the new lower nut in the same manner. The replacement outer screw will come with the attached lower
nut.
CAUTION
Apply grease generously to the outer and the inner screws when they are installed or damage to the unit could
occur.
TIMING OF INNER AND OUTER SCREWS
10. For proper ”timing” of the inner and outer screws (items L and M), reattach the lift housing cap (A) with both
output gears (C) removed and manually turn both inner and outer screws until they are flush with the top
edge of the caps (as shown in the illustration on page 86). Assure there is no gap between the cap and
the lift housing.
11. Reattach all gears and washers and reinstall the housing cap.
NOTE
Do not allow the wave washers on gears (E) and (F) to overlap with the flat washers. Align the ”ears” on the
large thrust washers with the ”pockets” in the housing cap.
12. Being sure the inner screws have not lost the timing position, attach the timing plate across the top of the
drive screws using the bolts removed from the header crossbar in step 3.
13. Reattach the lift housing assembly to the base of the bed and run the drive screws up electrically to the
top, with the timing plate still attached.
14. Remove the timing plate and reattach the drive screws to the litter top.
15. Reinstall all removed covers and panels.
16. Test the bed for proper operation before returning it to service.
Summary of Contents for Secure 3000
Page 78: ...Notes 78 ...
Page 106: ...Notes 106 ...
Page 184: ...Notes 167 2 ...
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Page 243: ...Appendix B Circuit Board Locations Bed Wiring Diagrams 224 This page intentionally left blank ...
Page 249: ...DH 3 94 3000 000 020 REV B 420 Alcott Street Kalamazoo MI 49001 ...