Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 28)

24 Precision Loads On-Board Weighing Installation & Service Manual
4. Detach the body from the chassis. Elevate the body using overhead lifting or air jack units and place the
spacer blocks between body and chassis, at the approximate points where the load cells will be installed.
Exact positioning of the load cells and brackets should be established at this point, and the chassis and
body brackets should be fabricated (See Section 4.2.1 on page 17).
5. The body should now rest 1" off the chassis at all four corners and the middle, and be squarely above the
chassis. Note the position of body crossmembers which may require body angles to be notched. Mark
positions for the body angles. Prepare the body runner surfaces by grinding off all burrs and any paint so
the weld surfaces are clean, bare and flat.
6. Tack weld load cell bearing plates to body angle. Mount load cell to bearing plate and position the entire
assembly on body runners using C-clamps to establish preferred positioning for chassis angles. Carefully
mark locations of both body and chassis angles.
7. Remove the entire assembly. Remove load cell and final weld the bearing plate to the body angle. Remount
the body angle to subframe runner, then tack and final weld the body angle in place. Ensure correct
alignment of all parts. Let cool.
8. Re-mount the load cells and chassis brackets. Mark the bolt hole positions on the chassis brackets. Drill
chassis brackets. Bolt on chassis brackets and load cells. Front (and middle position) load cells are
mounted with coil springs. Load cell cables should be directed inwards and tucked inside truck chassis.
9. Clean and paint all brackets with a metal primer after drilling and welding. Mount transmitter in a central
location so that all load cell cables can be connected. Plug-in all cables and tie down using heavy duty
cable ties every 18 inches or so. Protect cables where exposed with heavy duty split loom or spiral wrap.
10. Remove spacer blocks. Set all bolt torques per specification. Apply the bolt torque specification labels to
the vehicle as defined in section 6.1 on page 58
4.3 Kingpin Plate Mounts
Sensor models typically used for kingpin plate installations are the PL9000-22 load cell with single piece bearing
plate shown in Figure 4-20, and the PL9000-26 shear beam load cell, also with single-piece bearing plate. The
PL9000-22 load cell is 22.63 inches long (575 mm) while the PL9000-26 measures 26 inches (660 mm) in total
length.
Figure 4-20. PL9000-22 Kingpin Plate Mount
4.3.1 Skid Plate Preparation
General
Two critically important points which must be observed by the installer for accurate and safe kingpin plate
mountings are
• There must be adequate clearance between the kingpin skid plate and the trailer body subframe, at all times.
• The kingpin skid plate itself must be stiff and provide rigid support to the sensors.