SECTION 4—WHEELS AND WHEEL LOCKS
36
Adjusting Caster Fork Assemblies
NOTE: For this procedure, refer to FIGURE 4.4.
NOTE: Front and rear caster assemblies are adjusted in the same manner.
NOTE: A #10-32 X 11/16-inch Phillips head screw is used to secure the front head tube cap to the front head tube. A #10-16 X 3/8-inch
phillip pan head drill screw secures the rear head tube cap to the rear head tube.
1.
Remove the mounting screw securing the head tube cap to the head tube.
2.
To properly tighten caster fork assembly and guard against flutter, perform the following check:
NOTE: Two people are recommended to perform the following procedure - one to tip wheelchair back and one to inspect/adjust the caster
assembly.
A. Tip back the wheelchair.
B.
Pivot both caster assemblies to top of their arc simultaneously.
C.
Let casters drop to bottom of arc (casters should swing once to one-side, then immediately rest in a straight downward position).
D. Adjust 5/8-1/8-inch locknuts according to freedom of caster swing.
3.
Test the wheelchair maneuverability.
4.
Adjust 5/8-1/8-inch locknuts if necessary, and repeat STEPS 2-3 until correct.
5.
Position the head tube cover onto the top of the head tube.
6.
Using the mounting screw, secure the head tube cap to the head tube.
FIGURE 4.4
Adjusting Caster Fork Assemblies
Removing/Installing the Caster Fork Assemblies
NOTE: For this procedure, refer to FIGURE 4.5 on page 37.
NOTE: Front and rear caster assemblies are replaced in the same manner.
NOTE: A #10-32 X 11/16-inch Phillips head screw is used to secure the front head tube cap to the front head tube. A #10-16 X 3/8-inch
phillip pan head drill screw secures the rear head tube cap to the rear head tube.
Removing
1.
Remove the mounting screw securing the head tube cap to the head tube.
2.
Remove the 5/8-1/8 locknut and 5/8 X 1-5/16 X 1/8 inch washer and 5/8 X 1-1/8 X 3/16 inch stem spacer from the threaded
post securing the caster fork assembly to the headtube.
3.
If necessary, remove the two bearings and tolerance rings from the head tube.
Fork
Mounting Screw
Head Tube
5/8-1/8-inch Locknut
Head Tube Cover