Performance Issues with 725, 730, 735, 740, and 745 Articulated Trucks{1000, 3030, 3101} Caterpillar

Articulated Truck:

725 (S/N: B1L1-UP; AFX1-UP)

725C (S/N: LFB1-UP; TFB1-UP)

730 (S/N: AGF1-UP; B1M1-UP)

730 EJECTOR (S/N: B1W1-UP)

730C (S/N: LFF1-UP; TFF1-UP)

730C EJECTOR (S/N: LFH1-UP; TFH1-UP)

735 (S/N: B1N1-UP; AWR1-UP)

735B (S/N: L4D1-UP; T4P1-UP)

735C (S/N: LFJ1-UP; TFJ1-UP)

740 (S/N: AXM1-UP; B1P1-UP)

740 EJECTOR (S/N: B1R1-UP; AZZ1-UP)

740B (S/N: L4E1-UP; T4R1-UP)

740B EJECTOR (S/N: L4F1-UP; T4S1-UP)

740C EJECTOR (S/N: LFN1-UP; TFN1-UP)

745C (S/N: LFK1-UP; TFK1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

Some "700 Family Articulated Trucks" are having some issues with performance.

Solution

This article provides the proper instructions for troubleshooting and the proper procedure for reporting the issue on performance. This article also provides instructions to collect the proper information in order to submit a Dealer Solution Network (DSN) service request.

Performance Troubleshooting

1. Set up the Caterpillar Electronic Technician (ET) data logger to record the channels in Table 1. Set the logging parameters to record at the highest sampling rate (four samples per second) and for a 10 minute duration.

   Note: Report the data log file as SDF files

2. Take photographs of the truck while the truck is loaded and take an estimate of the density of the material.

   Note: Depending on the performance issue the truck may need to be at the rated payload of the truck.

3. Set a mark on the haul road to start logging data and a place to stop logging the data. If you are comparing multiple trucks, used the same haul road to operate the truck on. That way each truck can be ran over the same course with similar loads.

   Note: Make sure to choose a road that you can operate the truck on with no interruptions.

4. If testing multiple trucks log the data for each truck separately.

5. Perform and record all the channels that are under "Available Parameters" in Table 1.

6. Take photographs of the test track listing grades and underfoot conditions.

Torque Converter Stall Test

Illustration 1	g01397579

Illustration 2	g01397582
(1) Indicator dots

1. Go to the transmission Electronic Control Module (ECM)

2. Choose "Diagnostics" then choose "Transmission Stall" from the drop-down menu. Illustration 1 and Illustration 2 will show the screens that should be used.

   Note: The instruction will tell you to run the machine at full throttle with the service brake applied.

3. The Cat ET will then place the transmission into sixth gear during the test.

4. Look at the indicator dots during the test. When you see 10 or 11 sets, take a screen capture. After you see 10 or 11 dots, the test will stop a second later. You might have to do this step a couple of times before you get a good screen capture.

5. Then you should get an engine speed and a boost reading that has not been affected by torque limiting.

Additionally Required Cat ET data

1. All of the ECM histogram data file.

2. The ECM configuration file.

3. The current totals file.

Machine Performance Checks

1. Check the intake and exhaust systems for leaks including the aftercooler.

2. Check the air filters.

3. Check the fuel filters.

4. Check the tire pressures and note the make and size.

Once you have collected all the information that was mentioned above, work through your dealer Technical Communicator to submit this information to the DSN for information necessary to complete any repairs. Make sure that you included all the information that you have collected.