Maintenance
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7
3.2 Load Cell Replacement
Use the following steps to replace load cells.
Figure 3-1. Load Cell Mount
1. Unplug AC power from the indicator and disconnect the load cell cable from the indicator.
2. Lift off the scale top cover and locate the four upper load cell screws. Use a 1/2" wrench to unscrew and remove those
four load cell screws (
).
3. Lift off the scale’s top frame.
4. Remove the spacer between the load plate and load cell and set it aside.
5. Loosen the four overload stop screws and turn each screw once to provide ample clearance for the new load cell.
6. Turn the scale over and back off the overload protection screw one complete turn to provide clearance.
7. Unscrew and remove the lower load cell screws.
8. Remove the bottom shim beneath of the load cell and set it aside.
9. Remove the load cell and cable from the scale.
10. Position the bottom shim directly beneath the load cell and screw in the lower load cell screws.
Torque bolts to 200 in-lbs.
11. Turn the scale upright. Position the spacer plate on the load cell, then place the top frame into position.
12. Screw in the four upper load cell screws.
13. Connect the load cell cable to the indicator.
14. Recalibrate the scale as described in
of this manual.
15. Adjust the load cell overload protection screws on the bottom of the scale by loading the scale to 125% capacity.
Place this weight on the top cover, centered on the platform. Use a hex wrench to screw in the load cell overload
protection screw until it touches the load cell, the back off 1/6 turn.
16. Recheck calibration.
17. To reset corner overload stop screws, load the top spider over one corner with approximately 30% of scale capacity.
18. Adjust the screw under that corner to just touch the top frame.
19. Place a drop of a non-permanent, high-strength locking compound such as Loctite
®
on the thread.
20. Back screw off slightly so it is not touching the top frame.
21. Repeat for each corner.
22. Replace the top cover and re-level the scale if necessary.
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Note
