Model 35 Viscometer Instruction Manual
208878 Revision N, February 2013 37
8.2 Maintenance
The instrument should be serviced by qualified personnel only. If factory service is
required, contact Fann for return authorization.
These tips are recommended for properly caring for the viscometer.
• Clean the bob and rotor after each test.
• Periodically examine the bob and rotor for dents, abrasion, or other damage.
• Always remove the bob from the bob shaft when transporting instrument to
avoid bending bob shaft.
• Periodically test the bob shaft bearings. Operate the instrument at 3 rpm or
6 rpm without sample. Observe movement of the dial. It should not move
more than +/- 1 division.
• Rough bob shaft bearings should be replaced.
• Oiling or greasing of the viscometer is not required in normal service.
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