1999/04/01 Caterpillar

New Control Panel Films Show That SR4B Generators Are Not To Be Wired In The Delta Configuration{7557,7566}

Usage:

All Generator Sets With 447, 448, 449, 450, 592, 593, 594, 595, 596, 597, 598, 663, 667, 690, 691, 692, 693, 695, 696, 697, 822, 824, 825, 826, 827, and 828 Frame Size Generators

Description of Change: Non 2/3 pitch SR4B Generators with 4 or 6 and 10 or 12 lead connections should not be connected in a delta configuration unless derated. When these types of generators are connected in the delta configuration, the circulating current within the delta will cause additional heat in the stator.

Adaptable To: Two new Control Panel Films have eliminated the delta wiring diagram to avoid improper connections. The 139-9026 Film replaces the former 7E-5940 Film on the generators which have 4 or 6 leads. The 139-9025 Film replaces the former 4W-9449 Film on the generators which have 10 or 12 leads.

NOTE: Engine News, March 1998 (SEBD9258-00) addresses the same change but only for generator sets with 447 through 598 frame size generators.

Caterpillar Information System:

1999/04/01 Updated 133-6350 EMCP II Generator Set Control Group Corrects Hourmeter Programming and Spare Fault Operation{4490}

1999/04/01 Special Instruction, REHS0345-01, "Generator Service Literature Index" Is Available{4450}

1999/04/01 Improved Data Logger Feature For Customer Communication Module{1926}

1999/04/01 New 155-5175 AC Current Probe For Generator Sets Now Available{1400,4450}

1999/04/01 Protection From Paint Is Required For The G3600 Hydraulic Actuator (Hydrax) Shaft{1909,7581}

1999/04/01 New Cover And Plate Assembly Used In Oil Level Contactor Groups To Help Resist Vibration Damage{1326,7450}

1999/04/01 Heinzmann Wastegate Actuator Relocated{1057}

1999/04/01 Using The Correct Diode When Using The Customer Communication Module In Multiple Engine Applications{1902,0374}

1999/04/01 Be Sure To Use The Correct Gas Fuel Pressure{1250,1270,1293}

1999/04/01 New Exhaust Manifold Group Seals Provides Improved Exhaust Gas Sealing{1059}

1999/04/01 Re-Alignment Warning Tag On All 3500 Generator Sets Reminds Of Alignment Required At Installation{1021}

1999/04/01 New Oil Pump Group Used{1304}

1999/05/01 Use 157-3722 Driver To Remove And Install Engine Valve Guides{0703,1104}

1999/05/01 Cold Start Advance Solenoid Available{1272,1250}

1999/05/01 New Design Of Cylinder Block And Main Bearings{1201,1203,1224}

1999/05/01 New Block Cover Used{1201}

1999/05/01 New Stainless Steel Filler Neck Now Used In Radiator Groups{1353}

1999/05/01 Use 125-5597 Mounting Bar To Disassemble And Assemble Heat Exchanger{1379}

1999/05/01 New Breakout Harness{1559}

1999/05/01 New Turbocharger Supports Help Prevent Watercooled Exhaust Manifold Cracking{1059,1052}

1999/05/01 New Basic Cylinder Head Group Used In 3500B High Speed Commercial Engines{1100,1103,1105}

1999/05/01 New Flywheel Housing Assembly Available{1157}

1999/05/01 Changes To High Pressure Gas Regulator Assembly Provide Improved Response{1270,1283}

1999/05/01 New High Pressure Air/Fuel Ratio Control (AFRC) Actuator Available For Operations In Wet Locations {1278}