Adjusting Caster Height; Adjusting Front Seat-To-Floor Height - Invacare A4 Owner's Manual

SECTION 6—WHEELS
9. To properly tighten caster journal system and guard against flutter, perform the following check:
A. Tip front of wheelchair off floor.
B. Pivot forks and casters to top of their arc simultaneously.
C. Let casters drop to bottom of arc (wheels should swing once to one‐side, then immediately rest in a straight downward position).
D. Adjust locknuts according to freedom of caster swing.
E. Test wheelchair for maneuverability.

Adjusting Caster Height

NOTE: For this procedure, refer to FIGURE 6.10.
1. Place the wheelchair on a flat surface.
2. Remove the headtube cap.
3. Remove the locknut that secures the fork to the wheelchair frame.
4. Perform one of the following:
A. Installing washer/spacers ‐ Perform the following:
i. Remove washer/spacer from fork stem.
ii. Remove fork stem from caster headtube.
iii. Install the washer/spacer onto the fork stem.
iv. Install the fork stem through the headtube.
v. Loosely secure the fork stem with the locknut.
B. Removing washer/spacers ‐ Perform the following:
i. Remove fork stem from caster headtube.
ii. Remove the washer/spacer from the fork stem.
iii. Install the fork stem through the headtube.
iv. Install the washer/spacer onto the fork stem.
v. Loosely secure the fork stem with the locknut.
C. No spacer adjustment necessary ‐ Proceed to step 5.
5. Position a large right triangle or ʺLʺ square on the flat surface and against the caster headtube that is welded to the
wheelchair frame.
6. Adjust the height of the casters by either adding or removing washers/spacers on top of the fork stem until the
wheelchair frame is parallel with the floor.
7. Reinstall the locknut and head tube cap onto the wheelchair.
8. Repeat this procedure for the opposite front caster.

Adjusting Front Seat-To-Floor Height

The position of the footrest, seat angle, back angle, seating system/upholstery, caster size and
position, rear wheel size and position, anti-tippers, as well as the user condition directly relate to
the stability of the wheelchair. Any change to one or any combination of the ten may cause the
wheelchair to decrease in stability. EXTREME care must be taken when changing the stability of
the wheelchair. Refer to the chart in General Guidelines on page 9 of this manual.
A4 Owner's Manual
Locknut
Washers
(Shown) or
Spacers (Not
Shown)
FIGURE 6.10 Adjusting Caster Height
WARNING
42
Caster Housing
Fork Stem
NOTE: Headtube cap
not shown for clarity.
Part No 1110545
"L" Square