Replacing Front/Rear Caster Assemblies; Adjusting Forks - Invacare Pronto M91 Owner's Manual

SECTION 10—SHROUD/WHEELS

Replacing Front/Rear Caster Assemblies

NOTE: For this procedure, refer to
FIGURE 10.3.
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.
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.
3. Test wheelchair for maneuverability.
4. Readjust locknuts if necessary, and
repeat STEPS 1‐3 until correct.
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®
Mounting
Screw
Washer
FIGURE 10.3 Replacing Front/Rear Caster
Assemblies
Base
Frame
Side
Shroud
Fork
FIGURE 10.4 Adjusting Forks
58
Locknut
Washer
Caster
Tabs
Dust
Cover
Locknut
Washer
Caster
Headtube
Part No 1141450