Replacing Manual Wheel Lock - Invacare Bora XTR Service Manual

Invacare® Bora® / Spectra® XTR Series
Removing Steering Head Bearings
1. Place wooden block under mobility device on the side
on which ball bearing is to be replaced.
2. The wheel on the side where bearing is to be replaced
must have enough ground clearance to pull it out of
bearing.
3. Secure mobility device against rolling away.
4.
Carefully remove plastic cap A with large screwdriver.
5.
Loosen and remove nut B. Hold wheel so that it does
not rotate when removing nut.
6. Pull steering head shaft downwards out of steering
head tube.
7. Take washers out of tube.
8. Take ball bearing out of tube.
If needed, use hammer and parallel pin punch to drive
bearing out of housing. Hit outer ring of bearing.
Installing Steering Head Bearings
Make sure you glue-in bearings every time you
change them, even though they were not glued-in
in the first place.
CAUTION!
Incorrect reassembly can damage bearings and
cause castors to come off
Single-row angular ball bearing rings are not
identical on both sides. There is only one
correct way to insert them.
– Bearings must always be installed so that
narrow borders of the ball bearings are facing
each other (inside).
– Steering head bolts and nuts must always be
pressing against wide (outside) border of ball
bearings. Otherwise, bearings will be pressed
apart and damaged by bolts.
Fig. 5-29
30
Fig. 5-27
Fig. 5-28
Fig. 5-30
The illustrations show the wide border of the ball bearing
on the outside of the ball race A and the narrow ball
bearing edge on the inside B.
1. Clean and degrease inner surface of housing and outer
diameter of new bearing.
2.
Shaft retaining compound can cause
damage to varnish and bearing parts
– Apply only a small trace of shaft retaining
compound.
– Make sure shaft retaining compound
does not touch varnished parts or sealing
ring.
Apply shaft retaining compound to outer ring of ball
bearing.
3. Make sure you insert ball bearings exactly as described
above.
Thicker inner bearing ring must face outwards.
4. Move bearing 2–3 times to distribute the glue
between bearing and housing.
5. Apply shaft retaining compound to second bearing.
Check that thicker inner bearing ring faces outwards.
6. Install bearing on fork, pay heed to the warnings
above.
7. Make sure that washers are correctly replaced.
8. Insert fork into frame.
After installation, castor should rotate freely but
bearings should have no play.
9. Tighten nut with 16 Nm.
10. Loosen nut, and tighten again with torque wrench.
11. Install plastic cap.

5.8.10 Replacing manual wheel lock

Tools:
• 4 mm Allen key
1. Loosen Allen screw A.
2. Take off brake B.
3. Take off panel sheet (not visible in image).
4. Replace parts in reverse order.
5. Test function.
1528338-Q