SECTION 9—CASTERS
Part No 1127114
97
Compass™XE
and Allegro®
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
ʺ
3
‐
wheeling
ʺ
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
ʺ
L
ʺ
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.
WARNING
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.
FIGURE 9.3
90° Adjustment of Caster Headtubes
DETAIL “A”
Caster
Headtube
Caster
Fork
“L” Square
Caster
Headtube
Top
Socket
Screw
Bottom
Socket
Screw
Positioning Cam
Top Locknut
Bottom
Locknut
Headtube
Channel
Wheelchair
Frame
