Invacare Pronto M91 Service Manual page 46

SECTION 4—SEAT
Removing
1. Remove flip back armrest from the wheelchair. Refer to Arm Service Procedures for
ASBA and Adjustable ASBA Seat on page 69.
NOTE: Note the back angle before disassembly for proper reinstallation.
2. On the side of wheelchair with armrest removed, remove one of the mounting screws,
washer, coved washer and locknut that secure the back cane to the seat frame.
3. Cut the tie‐wraps that secure the bottom of the existing back upholstery to the seat
frame.
4. Thread the mounting screw removed in STEP 2 through the back cane from the inside
of the wheelchair to hold the insert in place.
5. Remove the remaining mounting screw, washer, coved washer and locknut that
secures the back cane to the seat frame.
6. Repeat STEPS 1‐4 for the opposite side of the wheelchair and remove back assembly
from wheelchair.
7. Remove the two mounting screws and washers that secure the existing back
upholstery to the back canes.
8. If present, release hook and loop strap securing the back upholstery to the back canes.
9. Remove the two mounting screws used to keep inserts in the back canes in STEP 4. Set
mounting screws and inserts aside.
10. Loosen, but DO NOT remove, the two mounting screws and locknuts securing the
spreader bar to the back canes.
11. Grasp the hand grip and slide the back cane out of the spreader bar (if applicable) and
the back upholstery.
Installing
NOTE: If replacing back upholstery, discard existing back upholstery and perform this procedure
using new back upholstery.
NOTE: If replacing back canes, discard existing back canes and perform this procedure using new
back canes.
NOTE: Spreader bar is required on ALL back heights between 20 to 24 inches. Spreader bar is
required on back heights 16, 17, 18, or 19 inches ONLY if the width or depth of the chair exceeds
19 inches. Refer to FIGURE 4.9 on page 48 for proper spreader bar location on back canes.
1. Slide one back cane into back upholstery and through spreader bar (if applicable).
2. Position insert into bottom of back cane.
3. From inside of wheelchair, thread a mounting screw through the back cane to hold the
insert in position when installing the back assembly.
4. Repeat STEPS 1‐3 for remaining back cane.
NOTE: If changing the back angle, refer to Adjusting the Back Angle on page 48 to determine the
proper mounting holes for the desired back angle.
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Pronto M91™and M94™
46
Part No. 1125038