Maintenance
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04.00 | FDB | Assembly and Operating Manual | en | 389072
9. Reassemble as described in steps 22 through 39
.
8.3.4.2 Ring Cylinder Assembly FDB 300 / FDB 340
1. Remove the air motor as described previously.
2. Remove the front spindle boot and its retaining ring by
extracting the socket head screws at the front of the housing.
3. Use a small flat blade screwdriver to pry the ring cylinder
retaining ring free and remove it from the front of the housing.
4. From inside the housing, use a non-metallic drift to press the
ring cylinder out of the housing. (After prolonged periods of
use the o-ring seals may make removal of the compliance unit
difficult. If this occurs, support the front of the housing on a
suitable plate with a clearance hole for the ring cylinder and
use an arbor press for extraction.) Retain the small o-ring and
dowel pin for reuse. Always replace the large o-rings on the
outside of the ring cylinder assembly when it is reinstalled.
5. Replacing the ring cylinder assembly is the reversal of these
steps with the following points.
✓
Apply a thin film of grease or oil to the housing bore where
the ring cylinder seats prior to installation.
✓
Fit new o-rings to the outside of the ring cylinder assembly if
the old unit is being reinstalled. (Do not reuse the old o-
rings.)
✓
Insure that the small o-ring and dowel pin are in place inside
the housing before sliding the ring cylinder assembly into
place.
✓
Align the assembly marks on the housing entrance and the
flat surface of the ring cylinder assembly prior to pressing
the ring cylinder in the bore.
✓
Use hand pressure and a flat plate to press the ring cylinder
into the housing and past the retaining ring groove.
