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90° Adjustment of Caster Headtubes
NOTE: For this procedure, refer to FIGURE 9.3 on page 97.
NOTE: Whenever the seat height is raised or lowered by changing the caster size, fork length, rear
wheel size or axle mounting plate adjustments, the caster headtube needs to be checked to maintain
a 90° angle to the ground/floor. Caster headtubes that are perpendicular to the floor will roll better,
track straighter and minimize any ʺ3‐wheelingʺ of the wheelchair.
1. Make sure the wheelchair is on a flat surface.
2. Loosen, but DO NOT remove the bottom socket screw, and locknut that secure the
caster headtube to the wheelchair frame.
3. Remove the top locknut that secures the positioning cam to the caster headtube.
4. Remove the positioning cam from the caster headtube.
5. Position a large right triangle or ʺLʺ square on the flat surface and against the caster
headtube (Detail "A" of FIGURE 9.3).
6. Move the caster headtube back and forth until the caster headtube is perpendicular to
the ground/floor.
7. Reinstall the positioning cam onto the top socket screw that secures the positioning
cam and caster headtube to the wheelchair frame.
8. Rotate the cam until it fits into the headtube channel with the headtube remaining
perpendicular to the floor/ground.
NOTE: An indexing notch has been put on the positioning cam to help determine the setting of the
positioning cam on the opposite caster headtube.
9. Reinstall the locknut that secures the positioning cam to the caster headtube.
Torque nuts to 140-160 inch-pounds, otherwise, caster headtube may collapse and
cause injury to occupant.
10. Repeat STEPS 2‐9 for the opposite side of the wheelchair.
Wheelchair
Frame
Headtube
Channel
Caster
Headtube
Top Locknut
Bottom
Positioning Cam
Locknut
Part No 1127114
WARNING
Top
Socket
Screw
Bottom
Socket
Screw
FIGURE 9.3 90° Adjustment of Caster Headtubes
DETAIL "A"
Caster
Fork
97
SECTION 9—CASTERS
Caster
Headtube
"L" Square
Compass™XE and Allegro®
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Troubleshooting
