Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 35)

Applications 31
Standard 5th wheel kits are available for Holland and Fontaine 5th wheels. For other manufacturers of 5th wheels,
contact Rice Lake Weighing Systems for appropriate load cell models. Use PL9000-50 or PL9000-16 load cells for
Holland and Fontaine assemblies, however the PL9000-26 heavy duty shear beam load cell may be used to mount
5th wheel trunnions of other manufacturers, typically in Holland or Simplex Quick Change applications.
Figure 4-27. PL9000-50F Fontaine 5th Wheel Load Cell Kit
The following instructions apply to standard tractor 5th wheel installations.
Note
For Pole Trailers and Frameless End Dump Trailers: For 5th wheel mounts involving pole trailers and frameless
end dump trailers or other applications requiring blocking the 5th wheel plate, contact Rice Lake Weighing
Systems for additional instructions and parts required. See “Appendix” on page 58.
4.5.1 Installation Procedure
1. Determine the exact location where the 5th wheel assembly will be installed and mark the location.
Cables
5th Wheel
Plate
Holland or
Fontaine Trunnion
Unitized Load Cell
1/2” Chassis Angle
Figure 4-28. 5th Wheel Exploded View
2. Install a base plate transversally between the chassis rails which will be bolted to the outer frame angles.
Use minimum 3/8" steel plate, minimum 30 inches in length and wide enough for bolts to bolt through the
frame angle bolt holes.
3. When mounting the base plate, use a minimum of six (6) bolts per side to bolt the plate into the frame
angles. Use minimum 3/4" Grade 8 bolts and locknuts.
4. After bolting the base plate to the chassis angles, weld the base plate to the angles at the seams in a skip
weld manner (3" weld, 6" off, for example), and around the corners.
5. One the base plate is fully welded and bolted in place, assemble the 5th wheel load cells with bearing
plates, bolts, washers, shear slugs and 5th wheel trunnions with bushings. Use a thread locking compound
and torque the trunnion bolts (4 x 3/4"-16UNF x 1.500"L with flat washers) in place to mount the 5th
wheel trunnion on each load cell. Be sure to include the shear slugs provided with each assembly.