NIPPLE PIPE 0821543 - Caterpillar

65 Tractors;
AP-1000, AP-1050 Asphalt PaversReference: Service Magazine; July 7, 1986; Page 10; "Brushless Alternators May Not Charge In Certain Conditions". The 9W1082 Alternator is a brush-type, self-exciting, alternator used in the alternator group for the machines listed. The term "self-exciting" means that the alternator does NOT use battery voltage to power the field during engine start-up. Instead, it relies on residual magnetism in the rotor to begin the charging process. However, storage periods of approximately one month or more can cause the field slip rings to oxidize and more poor contact. This could prevent the alternator from beginning the charging process at engine start-up.
If the charging system was believed to be functioning normally at the beginning of the storage period, but a "no charge" indication on the Performance Monitor (or voltmeter) condition exists after the storage period, try the following steps.
1. Run the engine at high idle for two or three minutes to see if the oxidation on the slip rings break down and begin to conduct field current so that normal charging begins. If this does not work, proceed to the next step.2. With the engine "OFF", "flash" the alternator "B+" stud to the "R" terminal pin with a temporary connection. (This means with all of the alternator wiring in place, connect these two points for less than one second.) This step usually causes a spark or "flash", as the term suggests. Start the engine and check for normal charging.3. If Step 2 did not obtain the desired result, repeat Step 2 again, except start the engine and maintain approximately 1500 rpm prior to "flashing".4. If Step 3 did not succeed in starting the charging process, disassemble the alternator and clean the slip rings with 400 grit sandpaper. Assemble and install the alternator on the tractor. "Flash" the alternator as instructed in Step 2, and then start the engine. If normal charging does not occur, replace the alternator with a new one.