Maintenance
02.01|FDB 150, 300, 340, 660, 900, 1040 |en
59
Ring Cylinder Assembly Replacement
The compliance and articulation of the air motor spindle is accom-
plished using a circular array of pistons (ring cylinder) at the rear of
the FDB housing. After extended operation, this component may
need replacing to insure free motion of the pistons. The unit may
be replaced as an assembly, but its subcomponents are not user-
serviceable. To replace the ring cylinder assembly, perform the
steps in the following chapters.
Ring Cylinder Assembly FDB 150
1 Remove the air motor as described in steps 1 through 14 in
2 Remove the six socket head cap securing the rear housing to
the front housing assembly.
3 Remove the rear housing.
4 Invert the unit and press the ring cylinder assembly outwards
to the rear. Use a non-metallic drift to prevent damage. (It
may be necessary to use a small arbor press and support plate
to remove the ring cylinder if the unit has been in service for a
prolonged time).
5 To reassembly, apply a thin film of grease or oil to the bore in
the front housing assembly where the ring cylinder seats prior
to installation.
6 Use hand pressure and a flat plate to press the ring cylinder
into the rear bore of the front housing assembly until it reach-
es the retaining ring.
8.3.4
8.3.4.1
