Invacare At'm, Service Manual

Page: 53 / 60

SECTION 10—WHEELS AND CASTERS
Part No. 1125078
53
At’m
Replacing Forks
NOTE: For this procedure, refer to FIGURE 10.2.
1. Remove the headtube caps from the caster headtubes.
2. Remove the locknut and washer that secure the fork to the caster head tube.
3. Remove the caster from the old fork and install on the new fork. Refer to Replacing
Front Casters on page 52
4. Insert the new fork into the wheelchair frame and secure with one (1) locknut and
washer.
5. Adjust the forks. Refer to Adjusting Forks on page 53.
6. Replace the headtube caps on the caster headtube.
Adjusting Forks
NOTE: For this procedure, refer to FIGURE 10.2.
1. Remove the headtube caps from the caster headtubes.
2. To properly tighten the caster journal system and guard against flutter, perform the
following check:
A. Remove battery pack from wheelchair. Refer to Removing/Installing the Battery
Pack on page 39.
B. Tip back the wheelchair to floor.
C. Simultaneously, pivot both forks and casters to the top of their arc.
D. Let casters drop to bottom of arc (wheels should swing once to one-side, then
immediately rest in a straight downward position).
E. Adjust locknuts according to freedom of caster swing.
F. Bring wheelchair back to driving position.
G. Install the battery pack. Refer to Removing/Installing the Battery Pack on page 39.
3. Test wheelchair for maneuverability.
4. Readjust locknuts if necessary, and repeat STEPS 1-3 until correct.
5. Snap headtube caps into the caster headtubes.