Chevrolet B7 2001 Owner's Manual page 147

Medium duty b7 chassis
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3. Clean any dirt from the neck of the cylinder and the
top of the valve before you take out the cylinder.
4. Check the inside of the valve for any foreign matter
and clean as necessary.
5. Cover the valve to protect it from dirt and take out
the cylinder.
6. Whenever you take out the cylinder, install a new
gasket and spread a light film of clean oil on it. Use
only one gasket.
7. Put in the new cylinder. Turn it clockwise until it just
starts to contact the gasket.
8. Tighten the cylinder another one
(180 degrees). Don't make it too tight.
-
9. Re
tighten the cylinder clamp.
4-36
Front Wheel Bearings with Oil-Filled Hubs
(If Equipped)
Some vehicles have oil
-
half turn
If there isn't, clean the rubber fill plug in the center of
the glass, and remove it. Be careful not to allow any dirt
or water to get into the oil. Add enough oil to bring it up
to the level mark that you'll see on the glass.
Your Maintenance Schedule will tell you what to use.
When you fill the hub, check the glass again after
driving a short distance. It takes a while for the oil to
flow through the system, and you may find that you
have to add a little more to fill it to the proper level.
-
filled hubs.
If your vehicle has these,
check now and then to see if
they have enough oil. You
can tell by simply looking
into the sight glass to see if
there is oil there.

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