Maintenance; Repairing The Bearing Nut Bore - FIOR & GENTZ NEURO LOCK Notice D'utilisation

12. Maintenance

Check the system joint for wear and functionality every 6 months. Check the system knee joint every
3 months when treating children and people with cognitive impairments. Also check the functionality after
every maintenance carried out.
Joint Component
bearing nut
bearing nut bore
sliding washer
stop face
locking pawl
pressure spring
step lock pawl and step
lock stop disc
Secure the screws for the cover plate with the torque corresponding to the system width and LOCTITE® 243
medium strength during every maintenance (see paragraph 8.6). Remove all adhesive residues first.
The step lock pawl and step lock stop disc are subject to faster wear. This may result in shorter mainte-
nance intervals.

12.1 Repairing the Bearing Nut Bore

Insert a repair bushing if the bore for the bearing nut in the joint's lower part or in the flexion stop disc/step
lock stop disc is worn out.
1 Clamp the joint's lower part or the stop disc firmly into a vice.
2 Bore and ream the hole until it has reached the desired dimen-
sion (fig. 34 and 35).
3 Insert the repair bushing made of a special plastic into the bore.
Boring and Reaming Measurements for NEURO LOCK [mm]
System
Width
14mm
16mm
20mm
42
Problem
wear
oversize
wear
wear
wear
fatigue of spring force
wear
Repair
Bearing Nut
Bushing
Outer Ø
Inner Ø
8.5 8.5
9.6 9.6
10.5 10.5
Measure
replacing bearing nut
inserting repair bushing, see paragraph 12.1
replacing sliding washer, see paragraph 12.2
replacing extension stop and, if necessary,
flexion stop disc
replacing locking pawl, see paragraph 12.3
replacing pressure spring
replacing step lock pawl and step lock stop
disc, see paragraph 12.3
Repair Ø Measure-
Bushing ment for
Outer Ø Boring
9.6 9.3
10.5 10.2
11.5 11.2
fig. 34
Ø Measure-
Art. No.
ment for
Repair Bushing
Reaming
9.6 H7 BP1009-L029
10.5 H7 BP1110-L035
11.5 H7 BP1211-L040
fig. 35