1998/05/04 Caterpillar

Improved Alternator Groups Now Available{1405}

Usage:

Machines And Engines Using 121-4134, 121-4135, 117-1379, 125-9597, 107-7977, And 132-2156 Alternator Groups

Reference: Service Manual Mode; SENR4757-01; System Operation Testing And Adjusting, Delco Remy 21-SI Series Alternators; October 1997.

Description of Change: Improved alternator groups are now available which use an improved rear bearing.

Adaptable To: The improved 121-4134, 121-4135, 117-1379, 125-9597, 107-7977, and 132-2156 Alternator Groups are manufactured 2 February 1998 and later. The date code format for the alternator groups is YYMDD, where YY=year (i.e, 98), M=month code, and DD=day of the month (01-31). The month code is shown in Table 1. For example, 98B02 describes the alternator group produced on the 2nd of February, 1998.

Caterpillar Information System:

1998/05/04 New Load Sensing Signal Relief Valve Prevents Wear Between Load Piston And Housing{5117}

1998/05/04 New Rear Glass Assembly Improves Cab Assemblies{7300,7310}

1998/05/04 Serviceable Parts For Hydraulic Pilot System Pump{5073,5085}

1998/05/04 New Retaining Ring In Final Drive Motor Group Improves Reliability{5058}

1998/05/04 Special Instructions Are now Available For Installing Two-Way And Four-Way Pilot Valves{5051,5059}

1998/04/27 New Hardened Sleeve For Load Check Valve In Control Valve For Stick Circuit Improves Service Life {5067}

1998/04/27 New Relief Valves In Main Control Valve Improve Swing Operation {5051,5454}

1998/04/27 New Design Improves Travel Motor Regulator {4351}

1998/04/20 Oil Filter Group Changed To Allow Oil To Be Easily Drained From Oil Lines{1307}

1998/04/20 Oil Filter Group Changed To Allow Oil To Be Easily Drained From Oil Lines{1307}

1998/04/20 Additional Clip In Fuel Injection Lines Groups Helps Secure Advanced Diesel Engine Management (ADEM) I Electronic Control Module (ECM) Fuel Cooling Hose{1252}

1998/04/20 The Swing Bearing In The Bearing And Gear Group Is Improved{7063,5459}

1998/05/04 ROPS Instruction Film Available Through Parts Service{7177,7405}

1998/05/11 Special Instruction, REHS0183, "Removal And Installation Of Tamperproof Caps On A RSV Governor" Is Available {1264}

1998/05/11 A New Switch Used In High Pressure Screens Of Discharge Lines From Hydraulic Pumps Is Resistant To Internal Leakage Of Hydraulic Oil {5050}

1998/05/11 Bolt Pattern Change From Six To Four In Piston And Rod For Bucket And Stick Cylinders Improves Service Life {5457,5458}

1998/05/11 New Engine Lifter Arm Assembly With Crowned Roller Used In Lifter Groups {1209}

1998/05/18 New Final Drive Parts Reduce Gear Play {4051}

1998/05/18 Entertainment Radios Improved With Increased Reliability {7338}

1998/05/25 New Main Pump Group Creates New Specifications For Service Manual Module SENR8961 {5050,0372}

1998/05/25 New Main Pump Group Creates New Specifications For Service Manual Module SENR8971 {5050,0372}

1998/05/25 New Ether Starting Aid Group Used {1456}

1998/05/25 New Valve Cover Seal Used {1107}

1998/06/01 Support Literature Is Now Available For Maintaining Air Conditioning And Heating Systems {7300,7304,7309,7320,7337}