Rice Lake SURVIVOR PT Series - Manual (Page 27)

Load Cell Replacement 23
7.0 Load Cell Replacement
Load cell replacement procedures are included in the following paragraphs.
7.1 Overview
Load cells are replaced on the 920i truck scale by jacking up the scale deck approximately 1/4" at the location of the
load cell mount and removing the upper mount chair, load cell and link as a unit.
After loosening the load cell bolts so they clear the threads in the baseplate columns, the four bolts holding the
upper chair to the deck are removed, allowing the chair, load cell and link to be slid out as an assembly. Replace the
load cell and reassemble in the reverse order.
If a low-profile hydraulic jack under 7-1/2" in height is not available, a bracket can be ordered from RLWS (PN
49523) to provide clearance for higher jacks.
Figure 7-1. Load cell mount.
7.2 Replacement Procedure
1. Remove the upper bolt and washer holding the ground strap to the upper chair.
2. Disconnect the flexible conduit section from the rigid metal conduit.
3. Disconnect the load cell terminal connections in the junction box. Attach a pull cord to the end of the load
cell cable and pull the cable out of the rigid conduit to free the load cell cable from the scale deck. Tie off
pull cable so that it will not pull itself back into the conduit.
4. Loosen the two load cell bolts until they disengage from the column threads.
5. Remove the four bolts that hold the upper mount chair to the deck frame.
6. Jack up the scale deck approximately 1/4" at the load cell location. Install blocking for safety.
7. Hold the loosened load cell bolts up to clear the threaded holes in the column and slide the upper chair,
load cell and link straight out as an assembly.
8. Set the chair aside until reassembly.
9. Lift the load cell bolts out of the damaged load cell and remove the cell from its link.
10. Remove flexible conduit section from the 90° elbow conduit connector.
11. Remove two small screws on the side of the 90° elbow connector and remove the access plate.
12. Pull the cable out the access hole. Remove the 90° elbow connector from the load cell.
13. Install the 90° elbow connector and flexible conduit section on the new load cell.
14. Complete reassembly by following Steps 1 through 9 in reverse order.
15. Use the pull cord to get the new load cell cable back into the summing box for connection.
Upper Chair Bolts
Load Cell
Bolts
Baseplate
Link
Load Cell
Upper
Mount
Chai
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