BODY AS 2941727 - Caterpillar

Payload Weight Measurement
Payload weight measurement is a function of the suspension cylinder pressure sensors. Certain conditions could affect the accuracy of the Truck Payload Measurement System (TPMS) when the truck is loaded. Some of these conditions are:
A truck is loaded on a sloped surface that is greater than 5%. Accuracy will become progressively worse as the slope becomes greater.Note: See System Operation, "Payload Management Guidelines" for proper loading guidelines.
A suspension cylinder is not properly charged. The suspension cylinders may not cause an event even if the charge is incorrect. However, the weighing accuracy will be affected.Note: See Special Instruction, SEHS9411, "Servicing the Suspension Cylinders for Off-Highway Trucks" for information on servicing the suspension cylinders.
Pushing down on the load with the loading tool during the loading process (packing the load)
Actuating the body raise lever during loading
A failure to perform payload calibration after replacing components in the TPMS
Using a conveyor or a continuous feed system for loading
Failures in the TPMS may cause the payload weight to become inaccurate, diagnostic events will be shown in the "event list"
The incorrect VIMS 3G onboard software is installed
The load is placed in the body, too far from the center of the marker
The payload configuration is set incorrectly
A failure to perform payload calibration after any substantial changes to the empty weight of the truckNote: Refueling does not require payload calibration. The accuracy of the TPMS is not affected if the first load is placed into the truck before the truck has stopped completely. The truck can also be repositioned during loading.If payload measurement accuracy is questioned, confirm the following:
The VIMS ECMs have the correct and the most recent software revisions.
No service work has been performed on the payload system that may have created the reported diagnostic.
The Payload system is configured correctly for the model of the truck. See Testing and Adjusting, "Payload System - Configure".
The payload system has been calibrated. See Testing and Adjusting, "Payload System - Calibrate".
The suspension cylinders are not topping out or bottoming out due to an incorrect charge pressure. See Special Instruction, SEHS9411, "Servicing the Suspension Cylinders for Off-Highway Trucks".Payload Reweigh
The accuracy of the reweigh process will be affected if the haul road is in need of repair. Note: A bad haul road may be indicated by a Fatigue Equivalent Load Analysis (FELA) value from the Road Analysis Control (RAC) of 1600 or greater. RAC is an optional feature of VIMS 3G.