Rice Lake BenchMark SLHE - Manual (Page 13)

Load Cell Replacement 9
5.2 12", 18", and 24" Models
1. Unplug AC power from indicator and disconnect load cell cable from indicator.
2. Lift off scale top cover.
3. Remove two load cell screws.
4. Lift off top spider.
5. Remove spacer plate and set it aside.
Overload Stop
Screws
Overload
Protection Screw
Load Cell Screws
Load Cell
Screws
Load Plate Top Frame
Figure 5-2. 12" x 12" Load Cell Mount
6. Loosen the four overload stop screws and turn each screw in one turn to provide ample clearance for the
new load cell. Turn scale over and back off overload protection screw one complete turn to provide
clearance.
7. Unscrew and remove lower load cell screws. Depending on model of scale, there will be either two or four
lower load cell screws.
8. Remove bottom shim beneath load cell and set it aside.
9. Remove load cell and cable from scale.
10. Thread cable of replacement load cell through rubber grommet.
11. Position bottom shim directly beneath load cell and screw in lower load cell screws. Torque to 80 in-lbs for
12" x 12" and 12" x 18" scales, to 120 in-lb for 18" x 18", 18" x 24", and 24" x 24" scales.
12. Turn scale right side up. Position spacer plate on load cell, then place top spider into position.
13. Screw in four upper load cell screws. Torque to 80 in-lbs for 12" x 12" and 12" x 18" scales, to 120 in-lb
for 18" x 18", 18" x 24", and 24" x 24" scales.
14. Connect load cell cable to indicator.
15. Recalibrate scale as described in Section 3.0 of this manual.
16. Adjust overload protection screw on bottom of scale by loading scale to 125% capacity. Place this weight
on top cover, centered on platform. Use a hex wrench to screw in overload protection screw until it touches
the load cell, then back off 1/6 turn. Recheck calibration.
17. To reset corner overload stop screws, load top spider over one corner with approximately 30% of scale
capacity. Adjust screw under that corner to just touch top frame. Place a drop of a non-permanent,
high-strength locking compound such as LOCTITE
® on the thread. Back screw off slightly so it is not
touching.
LOCTITE is a registered trademark of the Loctite Corporation