Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure

Usage:

Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure

CONFIDENTIAL TIBU3825-00

Show/hide table

TECHNICAL INFORMATION BULLETIN	June 25, 2003
PRODUCT FAMILY(S)	All Generators that use VR3, VR6B, and DVR Voltage Regulators
	Component Code: 1410

SUBJECT: Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure

PROBLEM:

Loose connections on Voltage Regulators can lead to above normal voltage output and regulator failure.

SOLUTION:

In order to help prevent unwanted above-normal voltage outputs and voltage regulator failures, perform the following actions: terminals:

VR3 Voltage Regulators (149-6130, 149-6131, 155-3819, 155-3820, 155-3821)

Add a 5H-6555 Lockwasher beneath VR3 Terminals 6, 7, 20, 22, and 24. Refer to Illustration 1.

VR6B Voltage Regulators (202-8634, 202-8638)

Add a 5H-6555 Lockwasher beneath VR6B Terminals 6, 6A, 7, 20, 22, and 24. Refer to Illustration 2.

DVR Voltage Regulators (155-3831, 155-3832, 155-3833, 155-3834, 155-3835, 155-3836)

Add a 5H-6555 Lockwasher beneath DVR Terminals 7, 20, 22, 24, 44, and 45. Refer to Illustration 3.

Illustration 1. VR3 Voltage Regulator

Illustration 2. VR6B Voltage Regulator

Illustration 3. DVR Voltage Regulator

Caterpillar Information System:

Check For Clearance When Installing New Electric Starting Motors Check For Clearance When Installing New Electric Starting Motors

Use of the 9Y-5710 Auxiliary Sea Water Pump in 3500 and 3500B applications Use of the 9Y-5710 Auxiliary Sea Water Pump in 3500 and 3500B applications

Automatic Engine Control Regulates Erratically on M300C-Series Wheeled Excavators Automatic Engine Control Regulates Erratically on M300C-Series Wheeled Excavators

Engine Speed Hunting on WEX M300C Series Engine Speed Hunting on WEX M300C Series

MODIFICATION TO PREVENT OIL BLOWING THROUGH THE 165-8460 VENT AS. MODIFICATION TO PREVENT OIL BLOWING THROUGH THE 165-8460 VENT AS.

Hydraulic Oil Overcooling Hydraulic Oil Overcooling

Little or No Heat is Produced by the Heating Unit Little or No Heat is Produced by the Heating Unit

Flashing New Software When Electronic Control Module (ECM) or Injectors Are Replaced Flashing New Software When Electronic Control Module (ECM) or Injectors Are Replaced

A NEW INJECTION ACTUATION PRESSURE CONTROL VALVE CONNECTOR INCREASES ENGINE OPERATION A NEW INJECTION ACTUATION PRESSURE CONTROL VALVE CONNECTOR INCREASES ENGINE OPERATION

Service Support Of Certain 320C Excavators Service Support Of Certain 320C Excavators

PREMATURE WEAR OF THE CHAIN IDLER GROUP PREMATURE WEAR OF THE CHAIN IDLER GROUP

Check The Fuel Transfer Pump Pressure When Fuel Filter Fault Codes Are Displayed On Certain Excavators Check The Fuel Transfer Pump Pressure When Fuel Filter Fault Codes Are Displayed On Certain Excavators

Improvements To The Heating Ventilating And Air Conditioning (HVAC) System Increase Operator Comfort Improvements To The Heating Ventilating And Air Conditioning (HVAC) System Increase Operator Comfort

PRIMER/PAINT ON THE FINISHED SURFACE OF CYLINDER RODS FOR SOME WORK TOOLS PRIMER/PAINT ON THE FINISHED SURFACE OF CYLINDER RODS FOR SOME WORK TOOLS

A New Relief Valve May Improve The Transmission Hydraulic Control Pressure On Certain M325B Material Handlers A New Relief Valve May Improve The Transmission Hydraulic Control Pressure On Certain M325B Material Handlers

AIR FILTER CLOGGED (EVENT CODE E272) EVENT ERRONEOUSLY LOGGED ON M300C-SERIES WHEELED EXCAVATORS AIR FILTER CLOGGED (EVENT CODE E272) EVENT ERRONEOUSLY LOGGED ON M300C-SERIES WHEELED EXCAVATORS

Interference From The Hose Routing Of The Fuel Return Hose Interference From The Hose Routing Of The Fuel Return Hose

Check Bolt Torque on Flex Plates of Certain 3508B Single Bearing Generator Sets Check Bolt Torque on Flex Plates of Certain 3508B Single Bearing Generator Sets

Certain 3E-5239 Relay Assemblies May Fail Certain 3E-5239 Relay Assemblies May Fail

Bracket Adjustment Improves The Seal Of The Cab Windshield Bracket Adjustment Improves The Seal Of The Cab Windshield

INTERFERENCE BETWEEN THE LIFT ARMS ; CERTAIN WORK TOOLS INTERFERENCE BETWEEN THE LIFT ARMS & CERTAIN WORK TOOLS

Procedure For The Preload Of The Bearings In The Final Drive Procedure For The Preload Of The Bearings In The Final Drive

MAIN CONTROL VALVE PLUGS LEAKS ON M300C-SERIES WHEELED EXCAVATORS MAIN CONTROL VALVE PLUGS LEAKS ON M300C-SERIES WHEELED EXCAVATORS

MODIFICATIONS ARE NECESSARY IN ORDER TO USE THE 165-9889 BROOM BRACKET GP ON ALPHA XR MACHINES MODIFICATIONS ARE NECESSARY IN ORDER TO USE THE 165-9889 BROOM BRACKET GP ON ALPHA XR MACHINES

Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure Caterpillar