Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 50)

Note
46 Precision Loads On-Board Weighing Installation & Service Manual
3. Roll suspension back into position.
4. Assemble each load cell to its bearing plate and part of the load cell clamp that bolts to the load cell itself.
DO NOT use thread locker at this point, but ensure bolt are correctly seated and tight.
5. Using the hydraulic jacks or forklift slightly lift the trailer upwards.
6. Position each load cell, bearing plate and clamp over the trunnion tube (dead axle) so it aligns with the
trailer underside supports.
7. Slide into position the ¾” thick flat mounting plates (identified above) so they are centered between the
load cell bearing plate and the trailer underside support on each side.
8. With both load cell clamp assemblies firmly and securely mounted to the trunnion tube, and evenly aligned
beneath the trailer underside supports, TACK WELD THE ¾” BASE PLATE TO THE TRAILER
UNDERSIDE SUPPORTS.
9. Lift the trailer slightly and remove the load cell assembly (clamp, load cell and load cell bearing plate). For
final welding of the base plates to the trailer underside supports, it may be necessary to roll the suspension
forward, for good access to welding surfaces.
Welder must weld the base plate to the trailer underside supports all the way around, i.e. on all four sides. It
might be necessary to raise the trailer slightly for better access to these base plate welds, particularly the
inside welds closest to the suspension leaf springs. Follow welding recommends, alternate sides and ends to
avoid overheating and potential warpage.
WELDING THE LOAD CELL BEARING PLATES:
1. When cooled, roll the suspension back into position, and remount the clamp load cell assemblies, so that
load cell bearing plates are flat on the base plates just welded. This will require lowering the trailer onto the
bearing plates using the jacks or forklift.
2. Ensure all load cell bolts are tight.
3. Ensure there is no weld spatter on either the bearing plate or base plate surfaces that might affect a tight,
flat fit.
4. Tack weld the load cell bearing plates to the base plates recently welded to the trailer underside supports.
5. Remove the four 1-1/8” load cell bolts, lift the trailer slightly, and slide the load cell/clamp assembly out
(to the center, then lift out).
6. Perform final welding of the load cell bearing plates.
RECOMMENDED: Use duct tape or some other material to cover the threaded bearing plate holes and prevent
entry into the holes of weld spatter. Also ensure there is no weld spatter on the bearing plate surfaces which
contact the load cells.
MOUNTING LOAD CELLS AND CLAMP HARDWARE:
1. When cooled, re-mount the load cells and bolt them into the bearing plates (two 1-1/8” bolts per load cell).
2. Ensure all bolt align correctly before torquing. Use a serviceable thread locker on all threads of the 1-1/8”
bolts. Torque these bolts to 1000 lb/ft.
3. Tighten all clamp bolts and use the thin tabbed bolt-head locking plates to ensure bolts cannot rotate loose.
Do not bend plates until final assembly testing is complete.
FINISHING THE INSTALLATION:
1. Remove the load cell cable clamp and mount the load cell cables to the output connector.
2. Install the load cell cable clamp over the cable connecting to the load cell. This clamp is intended to protect
the connector of the load cell, in the event of cable pulling (from log branches or ground protruding items
for example), by causing the cable to the load cell to break first and not cause damage to the load cell
connector.
3. Tie down all cables so they are not exposed to any type of damage.
4. Apply a primer or automotive underbody spray protector to the exposed steel of the base plates, load cell
bearing plates and trailer underside mounts.
5. Lower the trailer onto the load cells. Check load cell test numbers on the digital indicator in the cab.
POST INSTALLATION
After approximately two weeks of trailer hauling, visually check all welds, check bolt torques of the 1-1/8” bolts,
and perform a new scale calibration. Because the load cell steel and all steel used in the installation is new and
takes a few loads to properly seat the installation, a re-cal is recommended. The 1-1/8” load cell bolts must be
checked at each normal PM interval.