Replacing Front/Rear Caster Assemblies; Adjusting Forks - Invacare Pronto M51 Base Owner's Operator And Maintenance Manual

SECTION 8—TOP SHROUD AND WHEELS

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.
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 locknut according to
freedom of caster swing.
3. Test wheelchair for maneuverability.
4. Readjust locknut if necessary, and
repeat STEPS 2‐3 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 M51 Base with SureStep
FIGURE 8.3 Replacing Front/Rear Caster
Shroud
® 50
Mounting
Screw
Washer
Assemblies
Tabs
Side
Base Frame
FIGURE 8.4 Adjusting Forks
Locknut
Washer
Caster
Dust Cover
Locknut
Washer
Caster
Headtube
Washer
Fork
Part No. 1148076