Chapter 10: Troubleshooting
Load Cell Replacement Procedure
(11/96)
should be of sufficient strength and length to pull the new load cell’s
cable through the platform structure.
1k through 5k load cells are fastened to the platform using two 1/2”-13
UNC high strength socket head cap screws. Remove the two load cell
mounting screws with a 3/8” hex allen socket, retaining the screws for
reinstallation. 10k load cells are mounted with 3/4”-10 hex head screws
requiring a 1-1/8” socket or wrench. Lift the load cell from the mounting
surface .
Carefully pull the defective load cell’s cable through the platform while
feeding the string in at the junction box opening. Once the string is at the
load cell location, unattach it from the load cell cable.
Remove the rocker pin with o-rings from the defective load cell and
reinstall it in the new load cell.
Attach the new load cell’s cable to the pulling string and carefully thread
the new cable through the platform into the junction box opening. Coil
and store any excess cable within the platform side channel.
Secure the new load cell to the platform. Apply an anti-seize compound
such as “Never-Seez” to the threads of the mounting screws and tighten
with a calibrated torque wrench to 100 ft-lb (1-5k) or 250 ft-lb (10k cell).
Verify that the load cell has proper overload gap:
500 # - .009” to .015”
1250 # - .012” to .018”
2500 # - .017” to 023”
Thread the load cell cable through the connector on the junction box.
When the cable length inside the box is sufficient, tighten the box
connector.
Wire the new load cell cable to the proper terminal on the PCB per the
wiring code shown.
Reinstall the platform into the frame. Ensure that the rocker pins are
properly seated and aligned with the receivers in the frame.
Reattach the instrument cable and power-up the indicator. Perform shift
adjust and recalibrate the scale.
Notes:
1) Make sure load cell and platform
mounting surfaces are free of grease
and other foreign materials.
2) The 5,000 # load cell does not
have an overload stop.
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