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6.
The
CYLINDER PLATE BEARINGS [25]
provide a low friction support
medium for the Rotor. To check the condition of a Bearing, hold the inner
race and rotate the outer race by hand. If rough movement or substantial
side play are detected, replace the Bearing. It is also possible to compare a
used Bearing with a new one to detect the amount of wear.
7.
The
ROTOR BLADES [28]
are the most frequently replaced part since they
are subjected to a high degree of movement and friction. The Blades are
machined from a fibrous form of laminated phenolic. By means of various
treatments, Blades are stabilized so that they can withstand a wide latitude of
temperature, humidity, water and oil. They are almost immune to warpage.
All such characteristics are necessary to the smooth cycling action of the
Blades as they move in an out of the Rotor slot. When the motor is running at
regular speed, the Rotor Blades will be in continuous and forceful contact
with the cylinder wall. In this powerful rotation each Rotor Blade can develop
a thrust of over 6 lbs. At such pressures, any foreign material caught
between the outer edge of the Blade, and cylinder wall can cause wear,
scoring, and possible breakage. An air filter can help remove such harmful
material, and a Lubricator will provide a thin oil film between the edge of the
blade and the cylinder wall. This provides a better pressure seal and lessens
the friction and wear.
If the Blade loses 20% or more of its width, or when, in the Rotor slot, it is
worn 3/16" or more below the OD of the Rotor, the Blades must be replaced.
IMPORTANT
Open type bearings in good condition may be
washed in a fresh, clean solvent and then re-
packed with a good quality bearing grease such
as MOBIL DELVAC™ Xtreme Grease
(PN: 36-10605).
IMPORTANT
Width and height can be checked by comparing
the old blades with a new one.
