1989/04/17 Caterpillar

Low Gear Limits May Be Ignored On 3406B (PEEC) Truck Engines{1705,1707}

Usage:

A recent update to the personality module on 3406B (PEEC) Truck Engines has caused some confusion in the field when operating the truck in the low gears. Under light load or no load conditions, a PEEC engine will ignore Customer Specified Parameters, Low Gear No. 1 and Low Gear No. 2.

This change applies to 3406B (PEEC) Truck Engines 8TC6561-Up and any other engines that are equipped with any of the following 1989 Personality Modules.

Part numbers of 1989 Personality Modules: 0R6019, 0R6020, 0R6014, 9X3107, 0R6013, 9X3110, 0R6010, 9X3119, 0R6012, 9X3114, 0R6011, 9X3117, 0R6016, 9C3103, 0R6015, 9X3104, 0R5994, 7X6350, 0R592, 7X6331.

When the rack is less than 5 mm, PEEC assumes the truck is out of gear and allows Top Engine Limit to be obtained without limiting acceleration. This condition is frequently met when operating with either a light load or no load. Such operation is normal.

Caterpillar Information System:

1989/04/17 Recommended Wiring For Vehicle Speed Circuit{1705}

1989/04/10 New Service Tools Available {0600}

1989/04/03 Be Sure Electrical Components Are Correctly Grounded{1408}

1989/04/03 New Cylinder Blocks, Main Bearing Caps, And Main Bearing Cap Bolts Used{1201}

1989/04/03 Follow Recommended Procedure When Adding Oil To Track Rollers And Idlers{4154,4159,4180}

1989/03/27 Additional Remanufactured Parts Available{1000}

1989/03/27 Exciter Rotor Retaining Bolt Torque Specification{4457}

1989/03/27 Bolts Must Be Reinstalled In Same Holes In Companion Flange And Gear Output Flange{3305,3360}

1989/03/27 Preventive Maintenance For Batteries{1401}

1989/03/27 How To Troubleshoot A Short-To-Ground In Power Wiring{1400}

1989/03/27 Understanding Causes Of Blown Fuses And Tripped Circuit Breakers{1400,1420}

1989/03/27 Understanding "Shorts," "Opens" and "Intermittents"{1400}

1989/04/17 Orifice Plates Can Reduce Foaming In Expansion Tank{1354,1395}

1989/04/17 Correct Installation Procedure For Cylinder Head Studs{1100,1201}

1989/04/24 Causes And Effects Of Low Battery Voltage On Electric Starters{1401,1453,1467}

1989/04/24 Radiator Fan Guards And Braces Changed{1360}

1989/05/01 Procedure For Replacing Batteries Or Battery Cables {1401,1402,1411}

1989/05/01 Procedure For Replacing Batteries, Battery Cables Or Disconnect Switches {1401,1402,1411}

1989/05/01 Procedure For Replacing Batteries, Battery Cables Or Disconnect Switches {1401,1402,1411}

1989/05/01 Owners Of Digital Diagnostic Tools (DDT) And Electronic Control Analyzer Programmers (ECAP) Must Register Their Service Tools To Automatically Receive The Mailing Of The May 1989 Service Program Module (SPM) Update {1705}

1989/05/01 Requirements For Cooling System Conditioner In 3176 Truck Engines {1352,1350}

1989/05/01 Two Retainers Used To Better Fasten Air Inlet Pipes In Turbocharger Compressors {1058}

1989/05/01 Keys For Power Modules Shipped Inside Air Louver {1021,7263,7315}

1989/05/01 Fuel Manifolds Changed To Steel {1252,1702}