COVER 1W0273 - Caterpillar

Charging System
The condition and state of charge of the battery at each regular inspection will indicate if the charging system is operating efficiently. An adjustment is necessary when the battery is always in a low state of charge or an excessive amount of water must be added to the battery (more than one ounce of water per cell per week or per every 50 service hours).Charging units and voltage regulators should be tested on the engine when possible, using wiring and accessories that are a permanent part of the system. Bench testing will provide the technician with an operational test of the charging unit or voltage regulator. Pre-repair testing will advise the depth of needed repairs. Final testing will prove the units are restored to their original operating efficiency.Before starting the on-engine test the charging system and battery must be checked as stated in the following steps to eliminate possible difficulty:1: Battery must be at least 75% (1.240 Sp. Gr.) full charged and properly secured in the carrier. The carrier must not place excessive physical strain on the battery.2: Cables between the battery, starter and engine ground must be of recommended wire size. Wires and cables must be free of corrosion with cable supporting clamps to reduce strain on battery posts.3: Leads, junctions, switches and panel instruments that are directly related to the charging circuit must be good enough to provide proper circuit control.4: Inspect the crankshaft pulley, charging unit pulleys and drive belts to be sure they are free of grease and oil and are capable of driving the charging unit load.Alternator Regulator
Delco-Remy
When an alternator is either overcharging or undercharging the battery, the alternator charging rate can be adjusted. Remove the pipe plug from the cover of the alternator regulator and use a screwdriver to turn the inside adjustment. Turn the adjustment one or two notches to increase or decrease the alternator charging rate.
ALTERNATOR REGULATOR
1. Adjustment screw, located on opposite side of alternator from output terminal.Prestolite
The regulator is a fully potted, solid state unit which has an adjustment screw (1) and washer on the back. This voltage adjustment feature is provided to meet seasonal operating requirements. The control voltage can be raised or lowered by .5 volt from the normal (N) setting by removing the regulator and changing the adjustment screw and washer position. Moving the screw and washer to "H" position at (2) will increase the voltage.
ALTERNATOR REGULATOR
1. Adjustment screw with washer. 2. High output position. 3. Green wire to alternator "F" field terminal. 4. Orange wire to battery. 5. Black wire to ground (not on later units).Alternator
When installing a 2P1698 or 2P1204 Alternator on a machine equipped with a 7S5897 or 9S4070 Alternator, see Special Instruction (GMG00844) for specific installation procedures.Starting System
Use a D.C. voltmeter to locate starting system components which do not function.Move starting control switch to energize the starter solenoid. Starter solenoid operation is audible as the starter motor pinion engages with the ring gear on the engine flywheel. The solenoid operation should