108833 Rev. C
18
S - 6 3 6 / S - 6 4 6
IX. SET-UP, ADJUSTMENT, & USE
O.SUSPENSION
NOTE–
Equivalent adjustments should be done to both the right and left suspension element.
It is important to properly adjust the pre-load and damping to ensure proper comfort and con-
trol for the rider.
1. Pre-Load Adjustment
With the rider seated in the chair and with batteries installed, insure that the main horizontal
member of the base frame is parallel to the ground. If it is not parallel, adjust spring collar (B) in
either direction to adjust. If the rear of the base frame is lower than the front, adjust the spring
collar clockwise when viewed from the rear of the chair. If the rear of the base frame is higher
than the front, adjust the spring collar counter-clockwise when viewed from the rear of the chair.
WARNING
The spring pre-load ring should never be adjusted so that the shock spring is
less than four inches long with the chair unoccupied and the batteries installed.
Too much spring pre-load may cause the spring to fail.
WARNING
Never use a high-powered washer for cleaning the shock. Always use mild soap
and a small brush.
2. Damping Adjustment
The suspension system used on the S-636/S-646 SE has the ability to adjust the rebound
(damping) of the suspension. Rebound or damping is the rate at which the spring returns to
its original position after experiencing a deflection.
a) Adjustment of the rebound (damping) is done by turning the red knob (C) on the sus-
pension. Turning the red knob clockwise slows the rate of return or decreases the
rebound. Turning the red knob counterclockwise quickens the rate of return or
increases the rebound.
b) Too much rebound will feel like the system stiffens over a bumpy surface. Adjust the
red knob a half turn counterclockwise and test for performance.
c) Too little rebound will feel like the system is trying to buck the rider out of the seat.
Turn the red knob a half turn clockwise and test for performance.
P. CHECK-OUT
Once the wheelchair is assembled and adjusted, it should roll smoothly and easily.
All accessories should also perform smoothly.
After the wheelchair has been set up be sure the chair performs to your specified
operational settings (see section
X. Operating Guide
). If the chair does not perform to specifi-
cations, turn the wheelchair OFF immediately and reprogram operational specifications using
the DTT Programming.
Repeat this procedure until the wheelchair performs to specifications before
attempting active use of the wheelchair.
If you have any problems, follow these procedures:
1. Review the set-up and check-out section and operating guide to make sure
chair was properly prepared.
2. If your problem persists, contact your authorized supplier. If you still have a
problem after contacting your authorized supplier, contact Sunrise customer
service. See the introduction page for details on how to contact your author-
ized supplier or Sunrise customer service.
16
C
B
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