Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 57)

Service and Troubleshooting 53
Figure 5-2. Spring Mounted Load Cell
5.7.2 Trunnion Load Pins
Typical service issues of trunnion load pins involve damage to attaching cables and connectors which may be
exposed, or rotation of the trunnion itself. When connecting cable leads to trunnion load pin connectors, the
installer must ensure some means of protection to prevent exposure of these leads to flying road debris, log
branches, loading equipment, etc. To prevent load pin rotation, the trunnion has two machined flat notches (which
must always face UP when a pin is installed). These notches are 2 inches wide. Flat bar sections should be welded
to the trailer that align with these machined flat notches of the pin to retain and prevent the pin from rotation.
Figure 5-3. Trunnion Load Pin
Note
Never weld to the trunnion load pin itself as this can destroy the circuitry of the load pin, as well as weaken its
structural integrity.
Rice Lake Weighing Systems only recommends the use of neoprene (poly) bushings with trunnion load pins, as
these do not deteriorate like rubber bushings. High quality poly bushings are available from Rice Lake Weighing
Systems.