7N129 Or 9S2259 Voltage Regulator Can Not Be Adjusted For Voltage Output{1405,1410}
Usage:
All Applications Of 3T1888 and 8N999 Alternators
Some Caterpillar Service Manuals incorrectly show that the voltage output for the 24-volt 7N129 (formerly 9S2259) Regulator can be adjusted. This regulator is used in the 50 amp 3T1888 (serviced by 5S9088) Alternator Group, and in the 75 amp 8N999 Alternator Group.
Do not try to adjust this regulator in the field. The calibration procedure shown in some Manuals is only for use during manufacturing. If the charging voltage is not in the range of 26.5 to 28.7 volts with ambient air at 26°C (79°F), replace the regulator.
Caterpillar Information System:
1986/06/02 New Coupling Removal Tools For XT Hose{0618}
1986/06/02 New "Two Inch" Gauges, Indicator And Senders Available{7450}
1986/06/02 More Precise Governor Speed Adjustment Possible With Attachment Governor Control Groups{1265,1264,1250}
1986/06/02 The Multi-Purpose Cleaners That Do It All (NACD Only){0645}
1986/05/26 Replaceable Wire Harness Connector Assemblies Available{1408}
1986/05/26 Optional Load Sharing Electric Governor Changed From 2301 to 2301A Woodward Governor{1250,1289}
1986/05/26 Wiper Motor Grounding{7305}
1986/05/26 Be Sure The Correct Sending Units Are Used With Oil Pressure And Water Temperature Gauges In Control Panels{7455,7453}
1986/05/26 Beaded Cylinder Head Gasket Provides A Better Seal For Camshaft Compartment{1100}
1986/05/26 How To Adjust Arming (Cocking) Pressure On Fuel Ratio Control On Caterpillar 3161 Governors{1050,1278}
1986/05/19 Timing Adapter Available To Use With 6V3100 Timing Indicator Group{0781,1550}
1986/05/19 Prevent Gasket Leakage On 3406B Truck Engines Equipped With Jake Brakes{1058,1063}
1986/06/02 Determining The Cause Of Glow Plug Tip Failures{1053,1105,1412}
1986/06/02 Crankshaft Seal Usage On 3300 Family of Engines{1160,1161}
1986/06/02 New Electric Shutoff Groups With Manual Override Available{1259}
1986/06/02 New Paper Towels Available{0600}
1986/06/09 Black Nylon Fuel Seals For Lockwire Available Only To NACD Dealers For Certain Customers{1257,1264}
1986/06/09 Hose Clamp Recommendations For ATAAC Engines{1058,1087}
1986/06/09 Cleaning Procedure For Air-To-Air Aftercooler On ATAAC Engines{1063}
1986/06/09 Address And Phone Number For Ordering Fabricated Tool Drawings{0600}
1986/06/09 Flywheel Housing With 6° Offset Transmission Mounting Holes Must Be Used In GMC Trucks{1000,1157}
1986/06/09 New Seal Prevents Oil Leakage From Threads Of Magnetic Speed Pickups{7487,7462}
1986/06/09 New Service Tools Available{0600}
1986/06/09 Three Types Of Maintenance Management Publications Available For Engines{0374}