MK-100084 Rev. A
26
Q UI C KI E 7 R
IX. DEALER SERVICE AND ADJUSTMENT
P. 4-LINK REAR SUSPENSION
WARNING
Rear suspension can affect the stability of the wheelchair. To avoid a fall, use a spotter and/or anti-
tips when becoming familiar with new equipment.
1. Tuning the 4-Link Rear Suspension
a. To stiffen 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 per-
formance 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
wheelchair frame, and the flat portions underneath outer camber tube clamp are parallel side to side. The end
of the camber tube should be flush 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 flat 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 flat 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
carpenters square, drafting triangle, etc.) down on the flat horizontal surface and up against the flat of the cam-
ber plug. Rotate the camber tube and plug assembly until the flat 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 flat portions underneath outer camber tube clamp are parallel side to side. The end of
the camber tube should be flush 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 time and write
down the change. This takes patience, but allows you to understand how each change affects 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.
59
60
59
61
60
59
59
61
parallel
60
A
B
E
C
D
G
D
D
F
