Brookfield Engineering Laboratories, Inc. Page 46 Manual No. M/92-021-N0902
Appendix J - Fault Diagnosis and Troubleshooting
Listed are some of the more common problems that you may encounter while using your Viscometer.
Spindle Does Not Rotate
❏ Make sure the viscometer is plugged in.
❏ Check the voltage rating on your viscometer (115V, 220V): it must match wall voltage.
❏ Make sure the power switch is in the ON position.
❏ Verify rpm: make sure rotational speed (rpm) has been correctly selected.
Spindle Wobbles When Rotating or Looks Bent
❏ Make sure the spindle is tightened securely to the viscometer coupling.
❏ Check the straightness of all other spindles; replace them if bent.
❏ Inspect viscometer coupling and spindle coupling mating areas and threads for dirt: clean
threads on spindle coupling with a 3/56 left-hand tap.
❏ Inspect threads for wear; if the threads are worn, the unit needs service (see Appendix G).
❏ Check to see if spindles rotate eccentrically or wobble. There is an allowable runout for 1/
32-inch in each direction (1/16-ionch total) when measured from the bottom of the spindle
rotating in air.
❏ Check to see if the viscometer coupling is bent; if so, the unit is in need of service.
If you are continuing to experience problems with your viscometer, follow this troubleshooting section
to help isolate the potential problem.
Perform an Oscillation Check
❏ Remove the spindle and turn the motor OFF.
❏ Gently push up on the viscometer coupling.
❏ Turn the coupling until the % on the display reads 15% - 20%.
❏ Gently let go of the coupling.
❏ Watch the coupling screw swing freely and rest on zero; watch the % values decrease and
rest at 0.0 (±0.1%)
If the viscometer does not rest at zero, the unit is need of service. See Appendix G for details on how
to return your viscometer.
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