Maintenance Procedures – Litter
82
DRIVE SCREW AND BALL NUT REPLACEMENT – HEAD MOTOR (CONTINUED)
7. Remove the clevis pin and slide the wing and tapered roller bearing off the drive screw.
8. Using a 5/16” nut driver underneath the litter, remove the screw holding the cam retention wire (B) to the
ball nut assembly.
9. Slide the cam and retention wire as far toward the foot end of the bed as possible to allow proper clearance
for removal of the drive screw.
25. Remove the hinge pin from the Fowler and main link.
26. To prevent the ball nut from coming off the drive screw, cable tie both ends of the ball nut to the drive
screw.
27. Pull the drive screw toward the foot of the bed and remove the head end of the drive screw and ball nut
assembly from the support (D). Push the drive screw toward the head end of the bed and remove the
foot end of the screw from the glide bushing support (E).
NOTE
Do not allow the ball nut assembly to come off the drive screw. The ball nut will be shipped attached to the
drive screw and retained in position during shipment. Remove the restraining straps after installing the drive
screw and nut.
28. Remove the thrust washers and bearing from the head end of the drive screw and set them aside.
29. Using two 7/16” open end wrenches, remove the bolt, nut and bushings (C) supporting the ball nut assem-
bly on the Fowler link.
30. Reverse the above steps to install the replacement drive screw and ball nut assembly.
NOTE
Apply grease to all bearing areas.
CAUTION
Verify the head motor stops properly at both upper and lower electric limits. If it does not, refer to page 77
for ”Limit Setting – Head Motor”.
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