Wheels; Checking The General Condition; Replacing The Casing Or Inner Tube For Pneumatic Tyres - Otto Bock B400 Service Manual

6.7 Wheels

CaUTIon
Risk of accidents due to worn or defective tyres. Replace wheels with PU tyres if the material is
cracking or damaged or when the tread becomes worn down to such an extent that there is only 5 mm
of radius left on the outer edges of the tyre.
Replace the casing of pneumatic tyres if it is bald or shows signs of cracking or other damage.
The B400 power wheelchair is propelled by two 14" drive wheels (optional: 12.5"). Two 9" castor
wheels are used for steering (optional: 8").

6.7.1 Checking the general condition

InfoRmaTIon
Direct sunlight (UV light) causes the tyres to age prematurely. As a result, the tread surface hardens
and corner pieces break out of the tread.
InfoRmaTIon
Avoid parking the wheelchair outdoors whenever possible. The tyres should be replaced every 2 years
regardless of wear and tear.
If the wheelchair is parked for an extended period of time or the tyres overheat (e.g. in the vicinity of
radiators or in case of exposure to strong sunlight behind glass), the tyres may become permanently
deformed. Therefore, sufficient clearance should always be maintained from sources of heat, and the
wheelchair should be moved frequently or placed on blocks for storage.
Steps:
1. Verify the tyre condition in regards to tread, porosity and cracking.

6.7.2 Replacing the casing or inner tube for pneumatic tyres

Both the castor and the drive wheels have two-piece rims that can be separated through remov-
ing of the Allen head screws.
Tools:
❒ Plastic tyre lever
❒ Inner tube repair kit
❒ Allen wrench, size 6
Steps:
1. Let the air out of the tyre.
2. Loosen all five Allen head screws.
3. Separate the two pieces of the rim.
4. Pry back the casing from the edges of the rim.
5. Push the valve completely through to the inside of the rim and pull out the tube.
6. Repair the tube with a conventional bicycle tube repair kit or replace it.
Properly reassemble all components upon completion of the work.
B400 Family
Service work
Ottobock | 27