Procedure 5 - Casters; Replacing/Repositioning/Installing Front Casters; Installing/Replacing Forks - Invacare spyder Service Manual

CASTERS
This Procedure includes the following:

Replacing/Repositioning/Installing Front Casters

Installing/Replacing Forks

Adjusting Caster Headtubes
WARNING
After ANY adjustments, repair or service
and BEFORE use, make sure all attachment
hardware is tightened securely - other-
wise, injury or damage may result.
REPLACING/REPOSITIONING/
INSTALLING FRONT CASTERS
(FIGURE 1)
WARNING
BEFORE performing this procedure, refer
to STABILITY in PROCEDURE 1 of this manual
for additional requirements.
1. Review STABILITY in PROCEDURE 1 of this manual.
2. Remove the bolt, axle spacers and locknut that se-
cure the front caster to the fork.
3. Remove the existing front caster from the fork.
4. Perform one (1) of the following:
A. IF REPLACING CASTERS WITH THE SAME
SIZE CASTERS - Note mounting position of EXIST-
ING front caster for installation of NEW front caster.
B. IF REPOSITIONING CASTERS OR REPLAC-
ING CASTERS WITH DIFFERENT SIZE
CASTERS - Refer to CHANGING SEAT-TO-
FLOOR HEIGHT in PROCEDURE 7 of this
manual to determine caster position needed for
the desired front seat-to-floor height.
5. Install NEW casters or reposition casters and reverse
STEP 1.
NOTE: If replacing casters with different size casters than
what was originally on the wheelchair, the caster height
MUST be adjusted to keep the wheelchair frame parallel to
the floor. Refer to ADJUSTING CASTER HEADTUBES
in this procedure of the manual.
Suspension
NOTE: Only
Fork
suspension
fork shown for
clarity. Casters
Bolt
remove/install
in the same
manner for all
forks.
Axle
Spacer
FIGURE 1 - REPLACING/REPOSITIONING/
INSTALLING FRONT CASTER ASSEMBLIES
INSTALLING/REPLACING FORKS
(FIGURE 2)
1. Remove the existing caster from the fork. Refer to
REPLACING/REPOSITIONING/INSTALLING
FRONT CASTERS in this procedure of the manual.
2. Remove the headtube cap.
3. Remove locknut and washer.
4. Drop the EXISTING caster and fork out of the caster
headtube.
5. If necessary, install spacer onto NEW fork stem. Re-
fer to CHANGING SEAT-TO-FLOOR HEIGHT in PRO-
CEDURE 7 of this manual.
6. Slide the NEW caster fork up into the caster headtube.
7. Install washer and locknut onto NEW fork.
8. Repeat STEPS 1-7 for the opposite fork.
9. To properly tighten forks and guard against flutter, per-
form the following check:
A. Tip back of wheelchair to floor.
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.
10. Test wheelchair for maneuverability.
11. Readjust locknuts if necessary and repeat STEPS 9-
10 until correct.
12. Snap headtube caps onto caster headtubes.
Locknut
Washer
Fork Stem
Locknut
NOTE: Only one (1) washer is shown here for clarity. There
may be up to four (4) washers and/or a spacer on the fork
Axle
stem.
Spacer
NOTE: Only suspension fork shown for clarity. Casters
remove/install in the same manner for all forks.
Caster
FIGURE 2 - INSTALLING/REPLACING FORKS
17
PROCEDURE 5
C
A
S
T
E
R
S
Headtube Cap
Caster
Headtube
Suspension Fork