Addendum; Service Tips - NAD C556 Service Manual

SERVICE TIPS

Cleaning Hub/Bearing
1. Undo hub nut and remove washer. Remove hub/bearing
from turntable. As the brass bearing bush is designed to fit
tightly in the plinth, gentle tapping on the base of the bearing
bush with a plastic hammer may be necessary. (We advise that
this is not done in front of the customer!)
2. Slowly withdraw the hub from the brass bearing bush, (if the
hub is pulled out quickly the ball bearing may inadvertently be
sucked out and lost). Remove ball bearing by turning the
bearing bush upside down and tapping sharply.
3. It is important that both the hub spindle and the inside of
the bearing bush are cleaned and degreased thoroughly. This is
best done using a
trichloroethane which is available from R.S Components Ltd. A
small amount of this can be poured into the bearing bush, and
with a finger placed over the hole, shaken thoroughly and
poured out. To clean the spindle apply the solvent to a piece of
lint-free cloth or kitchen paper. Wipe both spindle and the ball
bearing with same and replace.
4. Fit the hub back into the bearing bush and spin to check that
it is running freely. If its not, return complete assembly to
NAD.
5. If all is well, remove hub from bearing bush then tilt the
bearing bush and place two drops of Comma Hypoid EP80,
Castrol EPX80w/90 or Shell Spirax EP90, as recommended, in
the position as illustrated. Do not use more than two drops.
6. With the bush still tilted, slide hub (without twisting) back
into bearing bush. This method should ensure a release
passage for trapped air.
7. Spin hub to evenly distribute oil and refit into turntable.
Replace washer and tighten nut firmly, using an adjustable
spanner, to approximately 5Nm.

ADDENDUM

solvent cleaner containing
2-4
IMPORTANT
It is essential that the recommended oil is used as any
other lubricant will break down under pressure, causing
wear. It is available from most car accessory shops.
Degreasing: RS Components stock a solvent cleaner
containing 1.1.1. trichloroethane which is suitable for
degreasing the hub/bearing assembly and lift lower
assembly. Please note warning on solvent tin.
1.1.1.