Invacare M91 Owners Manual - Page 58

SECTION 10-SHROUD/WHEELS Replacing Front/Rear Caster Assemblies NOTE: For this procedure, refer to FIGURE 10.3. Locknut NOTE: Front and rear caster assemblies are replaced in the same manner. NOTE: When replacing the front/rear caster assemblies, it is necessary to brace the caster assemblies to prevent the wheel from spinning. 1. Remove the mounting screw, two washers, and locknut that secures the caster to the fork. 2. Remove the caster and discard. Mounting Screw Washer Washer Caster FIGURE 10.3 Replacing Front/Rear Caster Assemblies 3. Secure new caster to fork with existing mounting screw, two washers and locknut (FIGURE 10.3). Securely tighten. Adjusting Forks NOTE: For this procedure, refer to FIGURE 10.4. 1. Remove the dust cover. 2. To properly tighten caster journal system and guard against flutter, perform the following check: A. Tip back the wheelchair. B. Pivot both 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. Base Frame Side Shroud Fork Tabs Dust Cover Locknut Washer Caster Headtube 3. Test wheelchair for maneuverability. 4. Readjust locknuts if necessary, and repeat STEPS 1‐3 until correct. FIGURE 10.4 Adjusting Forks 5. Snap dust cover into the caster headtube ensuring that the tabs are under the plastic side shrouds. NOTE: Components exploded for clarity. There is no need to remove the fork from the base frame. Pronto® M91™ with SureStep® 58 Part No 1141450