Invacare ARROW MWD - Manual (Page 75)

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FIGURE 9 - REPLACING STABILIZER CYLINDER SPRING
Base Frame
Adjustment
Barrel
Stabilizer
Rod
Jam Nut
Adjustment
Nut
Spring
Retainer
Stabilizer
Spring
REPLACING STABILIZER
CYLINDER SPRING (FIGURE 9)
NOTE: Stabilizer springs are only on wheelchair mod-
els built before 7/1/1999.
1. Remove mounting screw and locknut that secures
top of the stabilizer fork assembly to the base frame.
2. Unthread adjustment barrel and remove from stabi-
lizer rod.
3. Unthread jam nut and remove from stabilizer rod.
4. Unthread adjustment nut and remove from stabilizer
rod.
5. Remove spring retainer from stabilizer rod.
6. Remove existing stabilizer spring.
7. Install NEW stabilizer spring.
8. Reinstall spring retainer.
9. Reinstall adjustment nut.
10. Reinstall jam nut.
11. Reinstall adjustment barrel.
12. Adjust stabilizer. Refer to ADJUSTING STABILIZERS
in this procedure of the manual.
Locknut
Mounting
Screw
ADJUSTING WEIGHT DISTRIBUTION
(FIGURE 10)
NOTE: The seat mount plates and seat support brackets
allow seat frame to be repositioned along the base frame.
NOTE: The position of the seat support brackets is factory
set at 5-1/2-inches from the front end of the base frame.
Use the following chart as a starting point.
Weight of Distance of Seat
User Support Bracket*
under 200-lbs 5-7-inches
over 200-lbs 6-8-inches
* Distance measured from the front of the base frame to
the front of the seat support bracket.
NOTE: Following the above chart will put 85-90% of the
total weight of the chair and user over the large wheels.
However, these settings may not be the most desirable in
terms of maneuverability and comfort for the user.
Adjustment for Optimum Performance
1. Loosen the four (4) mounting screws that secure the
seat support brackets to the base frame.
2. Adjust seat back until one (1) of the following occurs:
A. The clearance of the front riggings and the stabi-
lizers is at a minimum or
B. The rear stop is contacted.
WARNING
DO NOT adjust seat beyond limit stops.
3. Retighten mounting screws securing the seat support
brackets to the base frame.
4. Test wheelchair for handling.
5. If handling of the power wheelchair is drifting, repeat
this procedure moving seat up in small increments until
the chair handles properly.
6. Once the seat is adjusted to the point of proper han-
dling, comfort adjustments can be made
7. Check distance the stabilizer wheels are off the floor.
A. If distance is between 3/8 and 1/2-inches off of the
floor the user will experience a “normal” amount of
rocking when stopping or negotiating steeper in-
clines, depending on the amount of braking.
B. If distance is greater than 1/2-inches off of floor
the amount of rocking the user experiences when
stopping or negotiating steeper inclines will in-
crease.
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MWD WHEELCHAIRS PROCEDURE 15