VALVE-AIR RELIEF 6B9664 - Caterpillar

Test Tools For The Electrical System
Table 1
Tools Needed    
Part Number     Part Name     Quantity    
4C-4911     Battery Load Tester     1    
8T-0900     Ammeter     1    
6V-7070     Digital Multimeter     1    Most of the tests of the electrical system can be done on the engine. The wiring insulation must be in good condition. The wire and cable connections must be clean, and both components must be tight. The battery must be fully charged. If the on-engine test shows a defect in a component, remove the component for more testing.Refer to the service manual Testing And Adjusting Electrical Components, REG00636 for further information. This manual contains the following information:
Complete specifications for the components of the starting circuits
Procedures for the components of the starting circuits
Complete specifications for the components of the charging circuit
Procedures for the components of the charging circuit
Illustration 1 g00283565
4C-4911 Battery Load Tester The 4C-4911 Battery Load Tester is a portable unit in a metal case. The 4C-4911 Battery Load Tester can be used under field conditions and under high temperatures. The tester can be used to load test all 6, 8, and 12 Volt batteries. This tester has two heavy-duty load cables that can easily be fastened to the battery terminals. A load adjustment knob is located on the top of the tester. The load adjustment knob permits the current that is being drawn from the battery to be adjusted to a maximum of 1000 amperes. The tester is cooled by an internal fan that is automatically activated when a load is applied.The tester has a built-in LCD. The LCD is a digital voltmeter. The LCD is also an ammeter. The digital voltmeter accurately measures the battery voltage at the battery through wires for tracing. These wires are buried inside the load cables. The ammeter accurately displays the current that is being drawn from the battery.Note: Refer to Operating Manual, SEHS9249 for more complete information for the use of the 4C-4911 Battery Load Tester.
Illustration 2 g00296441
8T-0900 Ammeter The 8T-0900 Ammeter 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. This can be accomplished only if the current is less than one ampere.A lever opens the ammeter's jaws over a conductor. The conductor's diameter cannot be larger than 19 mm (.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