GILLIG LOW FLOOR, Руководство по обслуживанию

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Electrical System
369
Higher Than Normal Voltage:
If the alternator voltage is higher than specification, and the voltage regulator adjustment will not correct
the problem, check that the alternator/regulator wiring is correct. If wiring is correct, replace the voltage
regulator.
Alternator Bench Test
The alternator may be removed from the engine and checked on a test bench if proper facilities and
skilled personnel are available. The alternator may be tested without circulating oil through it, provided
the output is not allowed to exceed 100 amps; or, output may exceed 100 amps so long as the time of
operation does not exceed 15 seconds.
Operating the alternator at an output in excess of 100 amps for longer
than 15 seconds without adequate oil circulation will cause the unit to
overheat, resulting in damage to the wiring and diodes.
If the alternator will require circulating oil, an SAE #30 oil must be supplied to the connection on the di -
ode end cover at a pressure of 35 PSI and at a temperature of 180–220° F (83–93° C). This will provide
an oil flow of approximately 1 gallon per minute (gpm).
Alternator Repair
If an alternator is found to be defective, it should be replaced with a new or remanufactured unit. If you
want to rebuild the defective alternator, contact the manufacturer (Delco Remy) for instructions.
Alternator Removal
1. Open the rear engine access door and place the “IGNITION SELECT” switch in the “OFF” posi -
tion.
2. Place the 12- and 24 volt battery disconnect switch (in the battery compartment) in the “OFF”
position. Disconnect the ground (–) cable from the batteries.
3. A good practice is to take a quick digital picture of cable and hose routing so that when you
replace the alternator, you can route hoses and cables correctly and put all clamps and brackets
back the way they were. See Figure 9-14 for an example of cable and hose routing.
4. Disconnect the wires from the alternator “RELAY” terminal, the field “F1” (+) terminal, and
the field “F2” (–) terminal. Disconnect the battery cable from the “POS” output terminal on the
diode end cover. Tape the ends of the battery cable and wires to prevent short circuiting and tag
the wires to aid in identification at time of installation.
5. Disconnect the oil supply line and plug or tape the open ends to prevent the entry of foreign mat-
ter. Remove the clip securing the flexible oil line to the bracket on the drive end frame.
6. Remove the drive belt.
7. Remove the mounting screws holding the alternator to the brackets. Carefully lift alternator from
the brackets.