Replacing Steering Head Bearings On Castors - Invacare Bora XTR Service Manual

If old inner tube has been repaired and is to be
used again, and became wet during repair, it is
easier to replace it if it is lightly dusted with talcum
powder beforehand.
8. Install tyre in reverse order.
9. Apply rim halves to wheel.
10. Inflate tyre a little.
11. Place screws in wheel rim and tighten screws with
prescribed torque. Make sure that inner tube is not
clamped between wheel rim halves.
12. Make sure that tyre is contacting wheel rim directly.
13. Inflate tyre to prescribed pressure.
14. Make sure that tyre is still closely contacting wheel
rim.
15. Screw valve cap on.
16. Install wheels according to instruction. See respective
chapter.
Repairing Solid Tyre
• 6 mm Allen key
• 3 joiner's clamps with plastic caps
Risk of Damage to Rim Threads
Incorrectly tightened screws can cause damage
to rim threads.
– Tighten rim screws with prescribed tightening
torque.
1. Remove wheel as described in respective chapter in
this manual.
2. Secure rim halves against unexpected discharge with
three joiner's clamps. When doing so, make sure that
you do not scratch rims.
3.
Loosen and remove screws (2) on inside of wheel.
4. Loosen joiner's clamps carefully and alternately until
you can remove rim halves without risk.
5. Remove inner (3) and outer (1) half of rim from tyre
(4).
6. Replace any defective or worn parts.
7. Install tyre in reverse order.
8. When fitting rim halves together, make sure that drill
holes and threads for screws are placed exactly on top
of each other.
9. Place joiner's clamps in position.
10. Tighten joiner's clamps alternately in small stages until
rim halves are precisely aligned.
11. Install and tighten screws.
12. Remove joiner's clamps.
13. Install wheel as described in respective chapter in this
manual.
1528338-Q
Fig. 5-25
5.8.9 Replacing Steering Head Bearings on
Castors
CAUTION!
Risk of Crushing to Hands and Feet by Weight
of Mobility Device
– Pay attention to hand and feet.
– Use proper lifting techniques.
CAUTION!
Risk of Uncontrolled Movement of Mobility
Device
– Turn off power supply (ON/OFF key).
– Engage drive.
– Before raising mobility device, secure wheels
by blocking them with wedges.
– Prevent the mobility device tipping by
propping it up on a wooden block which
is long and wide enough under the battery
case. If the wooden block is too short or too
high, the mobility device can still tip.
CAUTION!
Incorrect reassembly can damage bearings and
cause castors to come off.
The single-row angular ball bearing rings are
not identical on both sides. There is only one
correct way to insert them.
– Follow assembly instructions precisely.
• 19 mm socket wrench
• Torque wrench
• Flat large screwdriver
• Oblong wooden block (at least 12 x 12 x 30
cm) for propping up mobility device
• Parallel Pin Punches (6/8)
• Hammer (300 g - 500 g)
• Shaft retaining compound (e.g. Loctite 662)
Fig. 5-26
The figure above shows an overview of the individual parts.
Plastic cap
A
Ball bearings
B
Nut
C
When removing, take care of small parts such as
screws and washers. Put all small parts down so
that they can be installed in correct sequence.
Service
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