ELBOW AS 3196222 - Caterpillar

Charging System
The condition of charge in the battery at each regular inspection will show if the charging system operates correctly. An adjustment is necessary when the battery is constantly in a low condition of charge or a large amount of water is needed (more than one ounce of water per cell per week or per every 50 service hours).When it is possible, make a test of the charging unit and voltage regulator on the engine, and use wiring and components that are a permanent part of the system. Off-engine (bench) testing will give a test of the charging unit and voltage regulator operation. This testing will give an indication of needed repair. After repairs are made, again make a test to give proof that the units are repaired to their original condition of operation.Before the start of on-engine testing, the charging system and battery must be checked as shown in the steps that follow:1. Battery must be at least 75% (1.240 Sp. Gr.) fully charged and held tightly in place. The battery holder must not put too much stress on the battery.2. Cables between the battery, starter and engine ground must be the correct size. Wires and cables must be free of corrosion and have cable support clamps to prevent stress on battery connections (terminals).3. Leads, junctions, switches and panel instruments that have direct relation to the charging circuit must give correct circuit control.4. Inspect the drive components for the charging unit to be sure they are free of grease and oil and have the ability to operate the charging unit.Alternator
Earlier Delco-Remy
When an alternator is charging the battery too much or not enough, an adjustment can be made to the charging rate of the alternator.1. Remove the covers from the end of the alternator to get access to the voltage regulator.2. Remove the rubber from the potentiometer so that the small screw can be seen.
Delco-Remy Regulator Adjustment
(1) Potentiometer adjustment screw. (2) Transistor pins.3. Connect a voltmeter across the batteries to measure the regulation of the voltage. The batteries must have a good charge for this measurement.4. Operate the alternator at medium speed for 30 seconds and take a measurement of the voltage. The voltage must be 27.4 volts. Turn the small screw counterclockwise to get less voltage output and clockwise to get more voltage output.5. After the adjustment has been made, put a thin layer of silicone rubber sealant (3S6252) on the adjustment screw and install the covers. Make sure the location of the wires to the voltage regulator is not over the transistor pins. The transistor pins can make holes in the insulation for the wires and cause a short circuit.Bosch, Nippondenso and later Delco-Remy
No adjustment can be made to change the rate of charge on these alternator regulators. If rate of charge is not correct, a replacement is necessary.Delco-Remy Alternator; Pulley Nut Tightening
Tighten nut that holds the pulley to a torque of 100 7 N m (75 5 lb ft) with the tools shown.
Tools