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Maintenance
From time to time, the bearings will need to be changed. Complete the
following to determine if it is time to perform this maintenance procedure:
1. The viscometer should have a zero dial reading when placed in an upright
position with the sleeve not immersed in uid prior to running tests.
2. With the instrument in this position, rotate the sleeve at 600 RPM. The
dial reading in air should not exceed one.
3. Place water in a suitable container and immerse the rotor sleeve to the ll
line.
4. Rotate the sleeve at 600 RPM. The dial reading in water should be
between 1.5 and 3.0.
5. At 300 RPM, the dial reading in water should be between 0.5 and 2.0.
If the viscometer fails to pass any one of the above tests, the bearings are
bad and should be replaced by a qualied instrument technician.
Bob Shaft Bearing and Torsion Spring Replacement:
Tools Required:
Allen Wrench, "
Phillips Head Screwdriver
Retainer Ring Pliers (small)
External Retainer Ring Pliers
Flat Screw Driver
Bob Shaft Wrench
Replacement Parts:
#134-05-2 Bearing for Bob Shaft, Shielded
1. Unplug the power supply and remove the sleeve and bob.
Use the bob shaft wrench to hold the shaft in place while unscrewing the
bob.
2. With the at-head screw driver, loosen the set screw in the speed control
knob. Remove the speed control knob from the unit.
3. Remove all four at-head screws on the outer housing cover and gently
lift the cover upward.
4. Loosen the set screw at the top of the Zero Calibration Knob one turn
counterclockwise.
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