Quickie
®
NITRUM
249817 Rev. A
28
IX. DEALER SERVICE AND ADJUSTMENT
O. 4-LINK REAR SUSPENSION
WARNING
Rear suspension can aff ect the stability of the wheelchair. To avoid a fall, use a spotter and/or antitips
when becoming familiar with new equipment.
1. Tuning the 4-Link Rear Suspension
a. To stiff en the suspension, turn the spring preload adjustor (A) clockwise (looking up at the
suspension system from underneath the wheelchair).
b. To soften the suspension, turn the spring preload adjustor (A) counter-clockwise (looking up
at the suspension system from underneath the wheelchair).
2. Alignment of Suspension Link Arms
Do not adjust the link arms (B). These are set at the factory to ensure proper tracking and
performance of the 4-Link Rear Suspension system.
3. Setting the Toe to Zero
Loosen the cap screws (C) (3 per side, unless equipped with anti-tips then 4 per side) that secure the
camber tube clamp. Observe the ball in the level (F), and rotate the camber tube (D) until the ball is
centered in the level. The toe is now set at zero.
Before tightening the screws (C), make certain that the camber tube is centered left-to-right relative
to the wheelc
hair frame, and the fl at portions underneath outer camber tube clamp are parallel side
to side. The end of the camber tube should be fl ush with the outer most portion of the camber tube
clamp. Torque fasteners (C) to 62 in-lbs. (7 Nm).
4. Setting the Toe to Zero– Alternative Method
Place the entire wheelchair on a fl at horizontal table or ground surface. Loosen the cap screws (C)
(3 per side, unless equipped with anti-tips then 4 per side) that secure the camber tube clamp. Locate
the fl at surfaces on the front and rear of the camber plugs. Place an object that is known to have an
accurate 90° corner (such as a c
arpenters square, drafting triangle, etc.) down on the fl at horizontal
surface and up against the fl at of the camber plug. Rotate the camber tube and plug assembly until
the fl at surface of the camber plug (G) is parallel to the measuring tool.
Before tightening the screws (C), make certain that the camber tube is centered left-to-right relative
to the wheelchair frame and the fl at portions underneath outer camber tube clamp are parallel side
to side. The end of the camber tube should be fl ush with the outer most portion of the camber tube
clamp. Torque the fasteners to 62 in-lbs. (7 Nm).
NOTE– When turning the 4-Link Rear Suspension, always make one change at a time and write
down the change. This takes patience, but allows you to understand how each change
aff ects the ride of the wheelchair in conjunction with rear suspension.
NOTE– Lower shock mount is designed to have a loose feel, this is by design to allow for proper
suspension travel.
NOTE– Never remove the barrel nut (E) that connects camber clamp to the shock camber clamp.
5. Maintenance for the 4-link suspension
a. Do not apply lubrication to shock end bushings or coils.
b. You can apply lubrication to the link ends after cleaning with a mild soap and soft brush.
c. Use a soft brush to clear any dirt or debris from coil system.
d. Never use a high-powered washer for cleaning the 4-Link Rear Suspension.
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