Please read these instructions carefully before beginning the assembly. Failure to understand and
follow assembly instructions may result in injury to technician and/or end user and may void the
warranty. If you have any questions call Sunrise Medical Technical Support at +1(800) 333-4000.
NITRUM CASTER FORK ADJUSTMENT
INSTRUCTION SHEET
Sunrise Medical 2842 N. Business Park Ave Fresno, CA 93727 USA
© 2020 Sunrise Medical (US) LLC
08/2020 253037 Rev. A Page 1of2
Customer service: +1(800) 333-4000
or visit www.SunriseMedical.com
The following instructions are for adjusting Caster Fork Angle, Directional Stability, and Caster
Fork Height.
The caster fork adjustment mechanism has three settings:
• Caster fork angle
• Directional stability
• Caster fork height
The settings for directional stability and the caster fork height are combined; by twisting the
slightly angled caster axle (A) (Fig. 1), the fork moves inward (B) or outward (C) (Fig. 2). At the
same time, the height of the fork also changes by 1 mm for every full rotation of the caster
axle.
The detailed instructions for making the adjustments are described in the following section.
NOTE: The following adjustments may only be made by Sunrise Medical authorized dealers.
NOTE: You can also fi nd a service video about this on the Sunrise Medical YouTube channel.
WARNING
•
Faulty adjustments, or adjustments that have not been carried out correctly, may cause
damage to the wheelchair or result in a fall and severe injuries to the user and other
people.
•
Wherever torque settings are specifi ed, it is strongly recommended that a torque wrench
(not included) be used to verify correct torque specifi cation is achieved.
•
Some of the screws that are used during manufacture are fi tted with threadlock (blue or
yellow dot on the thread) and can be undone and tightened again up to three times
before they must be replaced with new screws and threadlock. Alternatively, you can
put Loctite™ 243 threadlock on the screws and re-fi t them.
1. Setting the directional stability:
• Insert special Sunrise Medical 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
(Fig. 3).
• Rotate the caster inward, place a 90° setting gauge on the front of the fork and grasp
the caster axle between the round nut and the fork with a fl at 19mm open-end
spanner wrench (p/n 66009205) and rotate it until the front of the fork is level with the
setting gauge (Fig. 4 and Fig. 5). To do this, rotate it by a maximum of 90° in one
direction, to avoid accidentally changing the height.
• After the adjustment has been made, keep the caster axle in position with the
open-end spanner while tightening the round nut to a torque of 28 Nm (20 ft-lb).
Note: The fork angle must be set after adjustment has been made
(see 3: Setting the caster fork angle).
Required tools:
1.
3
/
8
-in Torque Wrench
2.
90° Squaring Gauge
3.
Flat 19mm Open-ended
Spanner Wrench (p/n 66009205)
4. Torque Wrench (p/n 66009203)
5. 13mm Open-ended Wrench
6. Retaining Ring Pliers
0
15
15
30
30
45
TORQUE !
1
2
3
4
5
