Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 32)

28 Precision Loads On-Board Weighing Installation & Service Manual
9. Let all welds cool. Remove any welding slag and spatter. Reassemble the load cells to the bearing plates on
the kingpin plate. Lift the kingpin plate into position and bolt the load cells into the six (three per side) top
mounting bolt holes of the load cell mounting angles. Tighten all bolts to the correct torque values
specified in this manual. Verify correct alignment and gap spacing between kingpin skid plate and body
rails.
Figure 4-24. Kingpin Installation Diagram
Note
Since crossmembers provide rigidity to the trailer subframe, it is important for the installer to locate load cell
mounting brackets close to the crossmembers if possible, thus enhancing the structural strength of the
installation. Longer mounting angles to the body subframe add to added installation rigidity.
These assembly instructions assume that all bolts must be accessible for tightening to proper torque values during
installation and for post-installation maintenance. Rice Lake Weighing Systems never recommends that load cell
installations be made in which mounting bolts are not fully accessible at all times for inspection and maintenance.
4.4 Equalizer Hanger Mounts
The bending beam load cell typically used for center equalizer hanger mounts is the PL9000-50. Hanger
modification information contained in section 6.5 on page 63 pertains to the use of PL9000-50 load cells with
Hutch H-7700, Hutch H-9700, and Transpro Model 86 and 88 suspensions. For suspensions using cast hangers,
contact Rice Lake Weighing Systems as the hanger modification specifications are different, and typically require
the use of countersinking flat head allen bolts into the hanger plate to accommodate full equalizer pivot motion. For
widespread leaf spring suspensions and suspensions of other manufacturers, contact Rice Lake Weighing Systems
for hanger modification information.
Note
Suspension equalizer hanger load cell mounts are not recommended for high accuracy on-board scale
applications, such as split-load and deliver systems requiring accurate measurements of incremental loads.
For high accuracy applications, Rice Lake Weighing Systems recommends the installer use a suspension
subframe mount in which four load cells are positioned between the trailer frame and a suspension subframe.
Before Getting Started
• Identify equalizer hanger type (manufacturer, axle spread, fabricated or cast). See “Equalizer Hanger
Modification” on page 63
• In order to achieve the proper spacing required by the load cell and to maintain the proper position of the
hanger in the suspension, it may be necessary to countersink the bolts which bolt the hanger to the load cell.
Typically with 1/2" plate being used for the hanger modification, use 3/4-16UNF x 1.500" flat head allen
bolts (Grade 8 - part number PL9000-50FHB). This will allow the equalizer to move freely without
contacting the load cell bolt heads.
• Inspect all areas of the equalizer hanger and trailer frame for any signs of rust, wear, deterioration, frame
cracking or previous repair work.
4.4.1 Preparation
1. Clean the area of the hanger and trailer frame thoroughly.
2. Remove front wheels of the tandem axle group or front and center wheels if a triaxle.
3. Remove equalizer bolts (burn off huck if present).
4. Remove equalizer from center hanger.
5. Remove torque arm bolts.
6. Cut the cross tube that connects both equalizer hangers.