Replacing front/rear caster assemblies, Adjusting forks – Invacare Wheelchair Pronto M91 Base User Manual

Page 55

SECTION 8—SHROUD/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.

FIGURE 8.3 Replacing Front/Rear Caster

Assemblies

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