OHAUS CKW3R, Service Manual

CHAPTER 3  MAINTENANCE AND REPAIR PROCEDURES 

3.1   PREVENTIVE MAINTENANCE 

Ohaus scales should be carefully handled, stored in a clean, dry, area, and cleaned periodically.  
Follow these precautionary steps: 

–  When a scale has had chemicals or liquids spilled on it, all exterior surfaces should be 

cleaned as soon as possible with warm water on a damp cloth. 

–  Do not leave a mass on the scale when the scale is not in use. 

–  Allow time for the base to stabilize after moving it from an area which is at a different 

temperature than the area where it is to be operated.  Allow one hour for each 5°F 
(2.7°C) temperature change before using the base. 

3.1.1   Preventive Maintenance Checklist 

The scale should be inspected and checked regularly, as follows: 

1.  Clean the base. 

2.  Remove the Platform to inspect and clean the area beneath the Platform. 

CAUTION 

DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.   
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH. 

3.  Check the Load Cell cable for broken or damaged insulation. 

4.  Make a visual inspection as detailed in Chapter 2. 

3.2   Replacing the Load Cell 

A Load Cell that is even slightly bent or corroded should be replaced.  The Load Cell may also 
need to be replaced because of instability, or because the scale does not calibrate or repeat, or 
because it is physically broken. 

1.  Remove the Base Platform and disconnect the Base from the Indicator. 

2.  Remove the Load Cell Mounting Bolts and washers that secure the Top Frame to the 

Load Cell. 

3.  Set the Top Frame and the Load Cell Spacer aside.  (See Figure 3-1, next page.) 

4.  Remove the bottom Load Cell Mounting Bolts, washers and spacer.  The Load Cell 

assembly can now be removed from the Lower Frame. 

5.  Install the new Load Cell following steps 1 through 4 in reverse order. 

CKW Base Series Service Manual

3-1

Ohaus Corporation  www.ohaus.com