Replacing front/rear caster assemblies, Adjusting forks – Invacare Wheelchair Pronto M91 Base User Manual
Page 55
SECTION 8—SHROUD/WHEELS
55
Pronto® M91™Base with SureStep®
Replacing Front/Rear Caster Assemblies
NOTE: For this procedure, refer to
FIGURE 8.3.
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.
FIGURE 8.3 Replacing Front/Rear Caster
3. Secure new caster to fork with existing mounting screw, two washers and locknut
(FIGURE 8.3). Securely tighten.
Adjusting Forks
NOTE: For this procedure, refer to FIGURE 8.4.
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.
3. Test wheelchair for maneuverability.
4. Readjust locknuts if necessary, and
repeat STEPS 1‐3 until correct.
FIGURE 8.4 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.
Washer
Mounting
Screw
Caster
Locknut
Washer
Fork
Base
Frame
Tabs
Locknut
Dust
Cover
Washer
Side
Shroud
Caster
Headtube