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ENGLISH
Nitrum / Nitrum Hybrid Rev.C
Adjusting the wheel alignment
Important:
To achieve the very best movement, the rear wheels
must be adjusted to their optimum position, which means
correctly adjusting the wheel alignment.
To do this, measure the distance between both wheels front and
rear to ensure that they are parallel to one another.
The difference between both measurements should not exceed
5 mm.
To adjust the wheels to make them parallel, loosen the screws
and turn the axle sleeve accordingly. Make sure that after any
adjustment work, all screws are tightened correctly (see the
page on torque).
NITRUM tracking adjustment
Setting the toe-in/toe-out to zero
NOTE:
A wheelchair with 0° camber cylinders cannot have toe-in
or toe-out. This setting is necessary only with 3° and 6° camber
cylinders.
The term "toe-in or toe-out" defines how well the rear wheels of
the chair are aligned in relation to the ground. This determines
how well the chair will run. Normal resistance or rolling
resistance is present when toe-in is set to zero.
To set toe-in/toe-out to zero: Loosen the Allen screw (1) (one on
each side), that secures the camber tube clamp. Check the ball
in the horizontal (2) plane and turn the angle tube (3) until the
ball is in the centre. Toe-in is now zero.
Before tightening the screws (1), check that the camber tube is
centred left-to-right. The gap should be the same on both sides,
or there should be no gap at all. Tighten the screws to 7 Nm.
(Fig. 4.17 - 4.19).
Adjusting the rear wheelbase width:
The rear wheelbase is defined as the distance between the
upper side of the rear wheels and the backrest tubes, and is
represented by factory setting (125 mm). This has to be
increased if a larger gap between the tyres and the optional
height-adjustable armrests has to be created (Fig. 4.20).
NOTE:
When adjusting the rear wheelbase, adjust first one
wheel then the other. If both sides are loosened at the same
time, this will alter the toe-in/toe-out adjustment. To adjust the
rear wheelbase, the parts of the camber (4) move telescopically
into or out of the camber tube (5), and lock into place when they
reach the end. Loosen screw (6) (located closest to the camber
tube) on the left side of the chair. Move the axle receiver inwards
or outwards to achieve the desired wheelbase. Tighten the
screws to 7 Nm. Repeat this procedure on the right side of the
chair and adjust the gap so that it is the same amount as on the
left side.
Angle-adjustable back
Remove allen screws (A) on both backrest tubes. Adjust angle
within the hole-pattern (3° increment per hole), insert allen
screws (A) on both sides and tighten to 5Nm (Fig. 4.21).
Fig. 4.21
A
Folding backrest
The backrest is foldable, two versions of the release mechanism
are available:
•
Pushbar- release: push the release bar upwards, hold the
position and fold the backrest forward
•
Twist-lock-release : rotate the handle on the crossbar forward,
hold the position and fold backrest forward. The handle can
only be rotated in the forward direction.
A double-locking option is available on the backrest- if the
wheelchair is equipped with this option, the backrest will lock in
the flat-folded position.
To unfold the backrest, either push the pushbar upwards or
rotate the twist-lock handle forward.
The locking position (angle) of the folded backrest can be
adjusted : remove allen-screw (B) on both sides (Fig. 4.22), set
the desired locking angle by chosing the corresponding hole
within the hole-pattern (C) (Fig. 4.23) and re-tighten allen screws
(B) on both sides to 5Nm
Fig. 4.22
Fig. 4.23
B
C
Backrest
Fig. 4.17
1
Fig. 4.18
Fig. 4.20
4
5
6
Fig. 4.19
BALL
3
2
Wheel Alignment
