Maintenance
8.3.4 Ring Cylinder Assembly Replacement
The compliance and articulation of the air motor spindle is
accomplished 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.
8.3.4.1 Ring Cylinder Assembly FDB 150
Front Housing Assembly
Ring Cyclinder Assembly
Rear Housing
Socket Head
Cap Screw
1. Remove the air motor as described in steps 1 through 14
.
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
reaches the retaining ring.
7. Apply Loctite 7649 Primer® and Loctite 222® to the threads of
the six socket head cap screws that secure the rear housing to
the front housing assembly.
8. Install the rear housing to the front housing assembly and
secure with six socket head cap screws and torque to 1.35 Nm.
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04.00 | FDB | Assembly and Operating Manual | en | 389072
