Replacing Forks - Invacare A-4 User Manual

8.9

Replacing Forks

1. Remove front casters from wheelchair. Refer to Replacing/Adjusting Casters on page 69.
2. Remove the headtube cap.
3. Remove the locknut and washer(s)/spacer(s).
 There may be up to four washers/spacers on the fork stem above and/or below the headtube. Note the number and
position of these washers for reinstallation.
4. Drop the fork out of the caster headtube.
5. Slide the new fork into the caster headtube.
6. Check bearing assemblies and replace if necessary.
7. Ensure that fork slides completely into caster headtube.
8. Install washer(s)/spacer(s) and secure with locknut.
WARNING
Improper positioning of the washer will prohibit
the free movement of the fork.
9. Reinstall existing/install new front casters onto the wheelchair.
Refer to Replacing/Adjusting Casters on page 69.
10. 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.
Part No 1110545
Locknut
Nylon Washer
Spacer
FIGURE 9
71
8 WHEELS
Head Tube Cap
Caster Head Tube
Fork
Replacing Forks
Invacare® A-4® Wheelchair