FLOOR MAT 3959456 - Caterpillar

Normal Haul Cycle Tests
Purpose
The purpose of the haul cycle tests is to record key information on the engine, power train system, and suspension system that is monitored by the VIMS sensors while the truck is operating on a normal haul cycle. As with the stationary and moving vehicle tests, information from the haul cycle tests can be compared to:
Expected normal values,
Earlier tests ran on the same machine, or
Tests that have been run on similar machines.When the information is compared, the overall condition of the truck systems can be determined without the need for more time consuming installation of service tools.Logged data from a haul cycle can be used to assist in Fleet Management and haul road improvements.Note: Before beginning the Haul Cycle Tests, make sure that the Stationary Test 1 has been completed. It is important that secondary brake system be functional. The truck should also be at normal operating temperature as described in Stationary Test 1.Test 1: Long Uphill Haul
For this test, the loaded truck should be run on the longest uphill section of the job site haul road. If haul is more than 30 minutes, log only the loaded portion.The data logger should be downloaded and cleared before beginning this test.Test 2: High Speed Haul
For this test, the loaded truck should be run on the highest speed section of the job site haul road. If the haul is more than 30 minutes, log only the loaded portion.The data logger should be downloaded and cleared before beginning this test.Test 3: Typical Haul Cycle
For this test, the loaded truck should be run on the most typical haul cycle at the job site. If the haul is more than 30 minutes, log only the loaded portion.The data logger should be downloaded and cleared before beginning this test.Download Data and Clear VIMS
At the completion of the Truck Signature Tests, the data logger and event recorder should be downloaded and cleared.None of the tests described in this Special Instruction should cause VIMS to display a level 3 warning to the operator or log a level 3 event. If any level 3 events are present, the events should be investigated and appropriate repair made.Use the methods described in the Service Manual for troubleshooting.Analysis of Signature Test Data
Engine
Problem 1: Exhaust Temperature Split Too High
Exhaust temperature split is the difference between the right exhaust temperature and the left exhaust temperature taken at the same time. Left and right exhaust temperatures are measured at full load conditions during the following tests.
Stationary Test 4 - Converter Stall.
Stationary Test 5 - Double Stall.
Moving Test 5 - Loaded Uphill Grade.The exhaust temperature split will likely be highest for the Double Stall test.A normally performing engine has some variation in the bank-to-bank exhaust temperature, typically less than 20° C (36° F). An exhaust temperature split greater than 50° C (90° F) or a step change in the exhaust temperature split occurs, this split may indicate a serious problem.Probable Cause:
Faulty exhaust temperature sensors.
Defect in fuel injectors.
Leak or break in fuel