Procedure 6 - Casters; Repositioning The Front Caster; Assemblies; 90 O Adjustment Of The Caster - Invacare ORBIT Service Manual

PROCEDURE 6
This Procedure Includes the Following:
Repositioning Front Caster Assemblies
o
90 Adjustment of the Caster Headtubes

Caster Headtube Mounting Adjustments

C
A
REPOSITIONING FRONT CASTER
S
ASSEMBLIES (FIGURE 1)
T
E
NOTE: Refer to Procedure 1 - General Guidelines
R
which include GENERAL and SPECIFIC WARNINGS
S
concerning wheelchair stability.
NOTE: On six or eight-inch front fork, refer to
CHANGING SEAT-TO-FLOOR HEIGHT in PRO-
CEDURE 9 of this manual to determine the front
caster position needed for the required seat-to-floor
height.
1. Remove the hex screw, spacers and locknut that
secure the front caster to the fork.
2. Remove the front caster from the fork.
3. Replace front caster and reverse STEPS 1- 2.
Fork
Hex
Screw
Spacer
FIGURE 1 - REPOSITIONING FRONT
CASTER ASSEMBLIES
O
90 ADJUSTMENT OF THE CASTER
HEADTUBES
Whenever the seat height is raised or lowered by chang-
ing the caster size, fork stem length, rear wheel size or
axle mounting plate adjustments, the caster headtube
needs to be checked to maintain a 90
floor. Caster headtubes that are perpendicular to the floor
will roll better, track straighter and minimize any "3-wheel-
ing" of the wheelchair. Refer to PROCEDURE 6 in the
Owner's Manual, part number 1073955.
CASTER HEADTUBE MOUNTING
ADJUSTMENTS (FIGURE 2)
NOTE: Depending on the seat-to-floor height required, it
may be necessary to reposition the caster headtube on
the wheelchair frame to an upper or lower position.
Repositioning the Caster Headtubes
1. Determine the front caster position required for the
2. Remove the top locknut, bottom hex screw and lock-
3. Reposition the caster headtube to the position deter-
4. Re-install the caster headtube to the headtube mount-
5. Ensure the caster is perpendicular to the ground/floor.
6. Repeat STEPS 2-5 for the opposite caster.
Locknut
Wheelchair
Spacer
Locknut
Front Caster
Bottom
o
angle to the ground/
46
desired seat-to-floor height. Refer to CHANGING
SEAT-TO-FLOOR HEIGHT in PROCEDURE 9 of
this manual.
nut that secures the caster headtube to the headtube
mounting plate.
mined in STEP 1.
ing plate with the existing hex screw and locknut. Refer
to FIGURE 2 for correct hardware orientation.
o
Refer to 90 ADJUSTMENT OF THE CASTER
HEADTUBE in this PROCEDURE of the manual.
Frame
Top
Hex
Screw
FIGURE 2 - CASTER HEADTUBE MOUNT-
ING ADJUSTMENTS
CASTERS
Bottom
Locknut
Headtube
Mounting
Plate
Caster
Headtube