RING-PISTON 8N0502 - Caterpillar

The condition of charge in the battery at each regular inspection will show if the charging system is operating correctly. An adjustment is necessary when the battery is constantly in a low condition of charge or a large amount of water is needed. A large amount of water would be more than one ounce of water per a cell per a week or per every 100 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 testing or 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, perform a test in order to prove that the units have been repaired to the original condition of operation.See Special Instruction, REHS0354, "Charging System Troubleshooting" for the correct procedures to use to test the charging system. This publication also contains the specifications to use when you test the charging system.Test Tools For The Charging System
Table 1
Tools Needed
Part Number Part Name Quantity
225-8266 Ammeter Tool Gp 1
237-5130
or
146-4080 Digital Multimeter Gp
or
Digital Multimeter Gp 1 225-8266 Ammeter Tool Gp
Illustration 1 g01012117
225-8266 Ammeter Tool Gp
The 225-8266 Ammeter Tool Gp is completely portable. This ammeter is a self-contained instrument that measures electrical currents without breaking the circuit and without disturbing the conductor's insulation.The ammeter contains a digital display that is used to monitor current directly within a range between 1 ampere and 1200 amperes. If an optional 6V-6014 Cable is connected between this ammeter and a digital multimeter, current readings can be viewed directly from the display of the multimeter. The multimeter should be used under only one condition:
the readings are less than 1 ampere.A lever opens the ammeter's jaws over a conductor. The conductor's diameter can not be larger than 19 mm (0.75 inch).The spring loaded jaws close around the conductor for measuring the current. A trigger switch controls the ammeter. The trigger switch can be locked into the ON position or into the OFF position.After the trigger has been working and the trigger is turned to the OFF position, the reading appears in the digital display for five seconds. This accurately measures currents in areas with a limited access. For example, these areas include areas that are beyond the operator's sight. For DC operation, an ammeter contains a zero control, and batteries inside the handle supply the power.237-5130 Digital Multimeter Gp or 146-4080 Digital Multimeter Gp
Illustration 2 g00283566
237-5130 Digital Multimeter Gp or 146-4080 Digital Multimeter Gp
The 237-5130 Digital Multimeter Gp and the 146-4080 Digital Multimeter Gp are portable hand-held service tools with a digital display. These multimeters are built with extra protection against damage in field applications. Both multimeters are equipped with seven functions and 29 ranges. The 237-5130 Digital Multimeter Gp and the 146-4080 Digital Multimeter Gp have an instant ohms indicator. This indicator permits checking continuity