Maintenance
48
04.00 | FDB | Assembly and Operating Manual | en | 389072
5. Locate the two set screws securing the pivot bearing keying
dowel in the rear housing. One will be radially tapped in the
rear housing and the second will be axially tapped on the rear
mounting surface. Remove both screws.
6. Use a small diameter magnet or a powerful magnet attached
to the side of a hex key to reach inside the keying dowel pin
hole and remove the keying dowel pin from the rear housing.
7. With the dowel pin removed the old pivot bearing can be
pressed from the rear housing.
8. Reassembly is the reversal of the previous steps with the
following points:
✓
Insure that the hole in the outer race of the new pivot
bearing lines up with the radial dowel pin hole in the rear
housing and insert the pivot bearing in the rear housing
bore.
✓
Always use a new keying dowel pin. Insert the keying dowel
pin with its crowned (radiused) end first so it rests in the
slot machined in the pivot bearing’s ball.
✓
Apply low strength thread locker such as Loctite-222 to the
socket head screws used to secure the clamping washer and
refit both the washer and screws to the rear housing. Leave
the fasteners finger-tight at this time.
✓
Sparingly apply a low strength thread locker to the keying
dowel pin set screws and insert both set screws in the rear
housing.
✓
Adjacent to the keying dowel pin, pivot the bearing’s ball by
several degrees until the ball’s top surface is flush with the
clamping washer. Tighten the keying dowel’s radial set
screw until it just contacts the end of the dowel.
✓
While holding the pivot bearing ball in the deflected
position tighten the keying dowel’s axial set screw securely
to lock the dowel pin in place
✓
Apply two or three drops of light machine oil (or 30 weight
engine oil) to the ball of the pivot bearing and its keying
slot.
✓
Refit the rear housing assembly as described in the previous
section.
Once installed on the deburring tool, tighten the bearing preload
set screw until slight resistance to motion can be felt when the
spindle is articulated like a joystick. Tighten all socket head cap
screws securely. Do not tighten the set screws further.
