Replacing The Caster Fork; Replacing The Caster Wheel Bearing Set - Otto Bock B-Series Service Manual

4.10.4

Replacing the caster fork

f Prerequisites:
Optional: Move the seat to the lowest seat height (see Seite 12).
Switch off the control unit and deactivate the main fuse (see Seite 12).
If necessary: Remove the legrests.
Jack up the wheelchair (see Seite 11).
f Tools: Small and medium slotted screwdriver; Allen wrench size 5; torque wrench with Allen insert size 5
Removing the caster fork
1) Remove the caster wheel (see Seite 33).
2) Optional: Remove the caster wheel splash guard (see Seite 34).
3) Pry out and remove the cover cap on the caster wheel swing arm (see Fig. 61, item 1; see Seite 33).
4) CAUTION! Pinching, crushing, blows due to loosened caster fork. Actively secure the caster fork against
falling. Note the installed position of the screw connection and washers.
Loosen and remove the screw on the caster fork with 1 friction washer, 1 washer and 1 Belleville washer (see
Fig. 61/62, item 2).
5) Carefully pull the caster fork out of the caster wheel swing arm and set it aside in a safe place.
INFORMATION: The caster wheel bearings remain in the caster wheel swing arm. To replace the bearing
set, see Seite 35.
6) Optional: Remove the sleeves of the track stabiliser from the caster fork (see Fig. 62, item 3; see Seite 38).
7) Optional: Remove the stopper of the caster wheel swivel lock from the caster fork (see Fig. 62, item 4; see Sei-
te 36).
Installing the caster fork
1) Optional: Attach the stopper of the caster wheel swivel lock to the caster fork (see Fig. 62, item 4; see Sei-
te 36).
2) Optional: Attach the sleeves of the track stabiliser to the caster fork (see Fig. 62, item 3; see Seite 38).
3) Carefully insert the caster fork into the caster wheel swing arm with the bearing set.
4) Position 1 friction washer, 1 washer and 1 Belleville washer on the caster fork according to their original installed
position.
INFORMATION: Position the friction washer on the caster fork such that the 2 brackets of the friction
washer extend down into the axle of the caster fork.
5) Insert the screw into the caster fork and firmly tighten it to 0.9 Nm (see Fig. 61, item 2).
INFORMATION: The caster wheel (without track stabiliser) may turn freely by no more than 180° when
pushed.
6) Close the caster wheel swing arm with the cover cap (see Fig. 61, item 1; seeSeite 33).
7) Optional: Install the caster wheel splash guard (see Seite 34).
8) Attach the caster wheel (see Seite 33).
61
4.10.5

Replacing the caster wheel bearing set

f Prerequisites:
Optional: Move the seat to the lowest seat height (see Seite 12).
Switch off the control unit and deactivate the main fuse (see Seite 12).
B-Series
62
Service work
Ottobock | 35