PULLEY 1979581 - Caterpillar

The following topics describe care and maintenance of the electrical system components. These components functioning together produce the energy needed for operating the electrical equipment on the engine and each is dependent upon the others for satisfactory operation. In the event of failure or improper operation, it is essential to check the entire electrical system as a defect in one component can cause damage to another.Many electrical system problems can be traced to loose or corroded connections. Keep connections tight and make sure the wiring insulation is in satisfactory condition. Most of the electrical system testing can be performed while the components are on the engine. It should be remembered, if a malfunction is found on test, the component must be removed for further testing, repair or replacement. Some installations may have electrical components not furnished by Caterpillar. Consult the manufacturer's manual for maintenance procedure.Battery
Every 250 hours check the electrolyte level of each cell and the general condition of the battery. Maintain the electrolyte level to the base of each vent well. The make-up water must be one of the following (in order of preference):1. Distilled water.2. Odorless, tasteless drinking water.3. Iron free water.
Never add acid or electrolyte.
Cleaning Battery
Mix a weak solution of baking soda and water. Apply the solution with a soft bristle brush. Be careful not to get cleaning solution into the battery.
CLEANING BATTERY TERMINALSThoroughly rinse the battery and battery tray with clean water. Apply grease to the battery cable clamps and terminals and to all threads.Testing The Electrolyte Solution
The general condition of a battery can be determined by measuring the specific gravity of the electrolyte solution and adjusting the reading to 80°F (27°C). If the electrolyte level is too low to allow taking a hydrometer reading, add make-up water to the correct level and then charge the battery 2 to 4 hours before taking a reading.1. Insert the hydrometer into a cell. Fill the hydrometer barrel while holding it vertically. The float must not drag on the wall of the barrel.2. Read the hydrometer: 1.265 - 100% charged1.225 - 75% charged1.190 - 50% charged1.155 - 25% charged1.120 - Discharged1.000 - Water3. Test each cell in the same manner.4. If there is more than .050 (50 gravity points) variation between the highest and lowest reading, the battery should be replaced.5. Adjust the readings to 80°F (27°C). a. For every 10°F (5.5°C) the electrolyte temperature is above 80°F (27°C), add .004 (4 gravity points) to the specific gravity readings.b. For every 10°F (5.5°C) the electrolyte temperature is below 80°F (27°C), subtract .004 (4 gravity points) from the specific gravity reading.The corrected reading is of most importance during cold weather when the hydrometer reading is always corrected to a lower specific gravity reading. A low reading signifies the battery has less available power to crank the engine and that booster batteries may be required.
TESTING ELECTROLYTE SOLUTIONInstalling Battery
1. Be sure the battery tray is clean and free of foreign objects.2. Be sure terminal posts and cable clamps are clean.3.