WASHER (SEM) 5677881 - Caterpillar

Removing starter
Illustration 1 g02239573
Removing sequence (1) Harness (2) StarterInspection before removing alternator
Inspecting alternator operationLocate the cause of faulty charging from malfunctions described below. Do not remove the alternator for inspection and repair unless inspection cannot be performed with the alternator installed on the engine.
Table 1
Overcharge     Adjusted value of voltage regulator is high.    
Faulty battery.
Over discharge     Low adjusted value of voltage relay.    
Faulty alternator output.
Electric power consumption is extremely high.
Special load is used.
Faulty wiring. Handling precautionImproper handling could cause damage or failure to the alternator.
Connect battery cables correctly. B terminal is positive (+), and E terminal is negative (-).
Do not use any high voltage tester such as megger.
Do not disconnect lead wire from B terminal of the alternator while the engine is running.
Battery voltage is constantly applied to B terminal of the alternator. Do not ground at this terminal.
Do not short circuit or ground at L terminal. (For a built-in IC regulator type)
When a steam cleaner is used, do not allow the steam directly contact the alternator.Inspecting regulated voltage
Illustration 2 g02239574
Wiring method of vehicle (3) Switch (4) Ammeter (5) Voltmeter (6) Battery 12 V
Disconnect the battery (+) terminal, and connect an ammeter.
Connect a volt meter to terminal L ground line.
Make sure that the voltmeter indicates 0 when the starter switch is OFF position. Make sure that the voltmeter indicates much lower voltage than battery voltage when the starter switch is ON position.
Disconnect the terminal of ammeter, and start the engine.
Measure the adjusting voltage with voltmeter.
Table 2
Item     Spec     Standard     Condition    
Regulated voltage at
20 °C (68 °F)     12 V - 50 A     14.4 to 15.0 V     5000 rpm, 5 A, or lower,
20 °C (68 °F)    Inspecting output
Illustration 3 g02239575
Inspecting regulated voltage (3) Switch (4) Ammeter (5) Voltmeter (6) Battery 12 V
Disconnect the battery ground cable.
Connect (B) terminal of the alternator to the ammeter, then connect the voltmeter between B terminal and ground.
Connect the battery ground cable.
Start the engine.
Immediately apply all loads such as lamps (7) .
Increase the engine speed and measure the maximum output current at the specified alternator rotation speed with the voltmeter indicated the specified value.
If the measured value meets the standard, the output is normal.
Table 3
Item     Spec     Standard    
Terminal voltage/current Alternator rotation speed    
Output characteristics (when hot)     12 V - 50 A     13.5 V / 33 A or higher     2500 rpm    
13.5 V / 47 A or higher 5000 rpm    Removing alternator
Illustration 4 g02239854
Removal sequence (8) Harness (9) V-belt (10) Adjusting plate (11) Alternator (12) Alternator bracketInspect the alternator (11) for smooth rotation. Inspect the V-belt (9) for elongation of belt, degradation, and cracked.Removing glow plug
Illustration 5 g02321253
Removing sequence (13) Nut (14) Connection plate (15) Glow plug