Campbell Scientific 27106T Gill Propeller Anemometer - Manual (Page 13)

27106T Gill Propeller Anemometer
c) Loosen set screw on shaft collar/coupling disk and remove from
propeller shaft.
d) Slide propeller shaft through both bearings and out of housing.
e) Pull front bearing dust shield off housing.
f) Using the edge of a pocket knife, gently pry front and rear bearings
out of housing.
2. INSTALL NEW BEARINGS
a) Gently insert front bearing into housing.
b) Push front bearing dust shield back onto housing.
c) Carefully slide propeller shaft through front bearing and into housing.
d) Slide rear bearing over propeller shaft and gently push it into
housing.
e) Place shaft collar/coupling disk on propeller shaft.
f) Allow 0.010 inch (0.25 mm) end play gap between shaft
collar/coupling disk and bearing. Tighten set screw (80 oz in, 5600
gm-cm max torque).
g) Thread shaft housing assembly into generator housing. Tighten
firmly.
h) Check bearing torque to confirm it is within specifications.
6.2 Tach-Generator Replacement
This replacement procedure needs to be done by a
qualified technician. If a qualified technician is not
available, return the sensor to Campbell Scientific and
have their qualified technicians replace the Tach-
Generator. Refer to the Warranty and Assistance page for
more information. CAUTION
This replacement procedure is from RM Young Operation
manual (see Section 8). NOTE
When the tach-generator output becomes erratic (usually due to brush failure)
or begins to show signs of bearing failure (high torque), the entire generator
assembly should be removed and replaced. If replacing the tach-generator due
to excessive torque make certain it is indeed caused by a worn tach-generator,
not the anemometer flange bearings.
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