CAPSULE-VAPOR 4311345 - Caterpillar

Machine Operating Conditions
Machines operate under various conditions and loads, and are controlled by various operators. VIMS provides information to help understand and compare overall machine operation.Engine Speed vs Load Factor Histogram
Illustration 29 g02973336
This 3D histogram shows the loads seen at different engine speeds. The load factor is in percent and is based on maximum fuel useable at the given engine speed, so is one when operating on the lug curve. Illustration 29 shows a partial example in tabular form. Light loads at higher engine speeds would indicate a lightly loaded operation. Note that at high idle, the load factor is one and does not indicate working.The machine can be compared to other similar machines to see if the machine appears under or over utilized.Fuel Consumption Rate Histogram and Trend
Illustration 30 g02615354
Fuel rate is directly related to power consumption, which generally relates to work. The fuel rate trend shows the average fuel usage over an hour and clearly shows the workload of the machine, including idle. Illustration 30 shows multi-machine plots for two large TTT machines. The histogram shows the time at different fuel rates, clearly showing idle time and work time (high fuel rate).Ground Speed and Track Speed/Direction
These histograms indicate machine speeds in different gears. Additional histograms are provided on some machines for different gears, neutral only, and at gear changes. These histograms indicate speeds during various machine operations and also show high speed coasting and gear direction changes that can cause reduced machine reliability. Operators can then be coached in proper machine operation.Torque Converter (TC) and Transmission Shift Times
Off Highway Trucks have trends and histograms that show the Lockup Clutch (LUC) and certain Gear Shift times, and should be reviewed periodically to detect increases in shift times. Shift times are determined under the condition of high power train loads to provide meaningful results. In some cases no number will be available, if shifts are under light load. Longer shift times indicate a need for adjustment. Refer to SIS Testing and Adjusting of the Power Train for more information on normal shift times and adjustments required.Once an adjustment has been made, confirm TC LUC or Transmission clutch slip time is back in acceptable range by reviewing Trend data several days after the adjustment. Readjust if necessary to achieve desired time. This process should also be used to confirm the correct operation of newly installed rebuilt components. Collect several days of data then download and view trends to ensure that slip times are as expected.Expect Values - Ensure 90 percent of values are occurring less than maximum acceptable value.Action Trigger - Analysis shows more than 10 percent of values are more than maximum acceptable value.Action Required - At low hours, readjust valve timing to achieve desired slip time.Site-specific slip time values may be used to allow closer monitoring of slip times for the Torque Converter and Transmission Gear slip times. A set of expected values can be developed that allows closer tolerances than published factory ranges using "Fleet Trend" functions in