Quickie
®
NITRUM
249817 Rev. A
25
IX. DEALER SERVICE AND ADJUSTMENT
2. Adjusting the height
If the wheelchair does not stand properly on 4 wheels, i.e. one of the casters is not completely
touching t
he fl oor, the height of this caster should be adjusted as follows:
•
Place the wheelchair on a fl at surface, such as a worktop or similar.
•
Load the footrest with a weight of approximately 2.2-lbs (1 kg), make sure that the air
pressure is identical in both drive wheels, and rotate both casters into the straight line
position (casters pointing to the back)
•
Insert special tool (torque wrench, p/n 66009203) into a
3
/
8
-in torque wrench
•
Undo the round nut between the fork and caster connection with the spanner wrench.
•
Grasp the caster axle between the round nut and fork with a fl at 19mm open-end spanner
wrench (p/n 66009205) and rotate it counterclockwise. The caster will be lowered by 1 mm
with each complete turn (360°)
•
If the caster axle is rotated by one complete turn (360°), this will not infl uence the directional
stability. In all other cases, the directional stability must be adjusted again.
See: “1. Setting the directional stability” for more on this.
•
Adjust the caster axle until all 4 wheelchair wheels are standing fi rmly on the ground.
•
After the adjustment has been made, keep the caster axle in position with the open-end
spanner wrench while tightening the round nut to a torque of 28 Nm.
3. Adjusting the caster fork angle
This adjustment is necessary if the seat height/center of gravity has been changed, or the directional
stability has been adjusted.
WARNING
An incorrectly adjusted caster fork angle may cause the casters to wobble, and lead to the user falling or
severe injuries.
NOTE:
setting the fork to trailing (fork is inclined toward the back in the direction of travel) will increase
the probability of the casters wobbling. Setting it to leading (fork is inclined toward the front in the
direction of travel) can reduce the probability of the casters wobbling.
Loosen the Allen screws (A) (Fig. 49). The caster fork angle can now be adjusted to the front (leading) or
to the back (trailing).
To ensure caster fork is in an exactly horizontal position (90° to the fl oor, neither leading or trailing), use
a squaring gauge (e.g. 90° fl at angle, set square). Rotate the casters in the travelling position and place the
squaring gauge on the fl at front side of the fork (Fig. 50). The caster fork will be at an angle of 90° to the
fl oor when the squaring gauge covers the entire surface.
To set the fork slightly to leading, e.g. to prevent the caster fork from wobbling, set the angle so that a
slight light gap can be seen between the squaring gauge and contact area.
When position is set correct, tighten again the Allen screws (A) using the following procedure. Tighten
the outer allen screw fi rst to a torque of 7 Nm. Then, tighten the inner allen screw to a torque of 7 Nm.
Repeat this procedure up to 6 times until both allen screws are evenly tightened to a torque of 7 Nm.
4. Replacing the caster fork
•
Remove the locking clip (A) at the lower end of the caster axle.
•
Remove the nut (B) with a 13 mm open-end wrench.
•
Now replace the fork
•
Assemble again by following the instructions in reverse order
•
Torque nut to 10 Nm (B).
49
49
50
0
15
15
30
30
45
TORQUE !
51
50
51
0
15
15
30
30
45
TORQUE !
B
A
Summary of Contents for Quickie Nitrum
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