MERCEDES BENZ alternators
Bosch alternator and regulator with internal regulators
DESCRIPTION
By Bosch alternators are conventional 3-phase, self-correcting type of aggregate.
Bosch 75 through 55-amp alternators use3 positive and three negative diodes connected to stator windings to correct the failure, Bosch 90, and 80-amp alternators use 14 diodes.
All alternators use 3 exciter diodes connected to stator windings, while the engine is running the diodes turn off the light alternator indicator and power supply voltage regulator, Bosch regulator transistors, solid state physics and integral with the alternator.
Alternator CLAIM
Model V / Amps
(1) The manufacturer's part number
190E 14/70 489 928
190D 14/70 489 897
190D 14/70 489 897 ...
All Others 14/70 N / A...
2 Turn on the ignition and check the alternator light comes, if the light comes on, check wiring between the alternator warning lights including light bulbs.
1 Provide connections to the battery, alternator, and starter are clean and tight, ensuring the engine alternator and the body is properly grounded, make sure the alternator belt is tight and in good condition.
1 Provide connections to the battery, alternator, and starter are clean and tight, ensuring the engine alternator and the body is properly grounded, make sure the alternator belt is tight and in good condition.
...2 Connect the ammeter following the manufacturer's instructions, connect the voltmeter leads to battery terminals.
...4 Alternator output should be equal to the alternator rated output, minus 16-20 amps, if the reading is 16-20 amps below alternator rating, replace regulator and retest, if the output is still too low, repair or replace the alternator.
REGULATOR control voltage test
1 Connect the ammeter following the manufacturer's instructions, connect the voltmeter leads to battery terminals, start the engine at 3000 rpm
2 Run the engine until it stops the growth of current, voltage should be 13.5 to 14.5 V, if the reading is wrong, remove the regulator and ensure brushes are more than 6 mm.
3 If the brushes are fine and the regulator does not keep voltage within specified limits, replace regulator and retest, if the voltage is still incorrect, repair or replace the alternator.
Overhaul
Decomposition of
1 Remove the nut, lock washer, and pulley, remember the position of the gap, and then remove the fan assembly and keys, the writer marks on front and back cover, remove the voltage regulator and remove the screws, separate front and back cover.
2 Disconnect the capacitor from the terminal. Remove the nuts, bushings, bolts and washers
2 Disconnect the capacitor from the terminal. Remove the nuts, bushings, bolts and washers
...Third Unsolder the stator from diode Assembly. Remove washer carries a wave or a ring on the back of the case
3 Support front housing and gently press out rotor, the rotor does not allow to fall, remove the screws securing the bearing retainer, remove the bearing retainer front and rear direction of the seal removed from the slip ring at the end of the rotor.
3 Support front housing and gently press out rotor, the rotor does not allow to fall, remove the screws securing the bearing retainer, remove the bearing retainer front and rear direction of the seal removed from the slip ring at the end of the rotor.
...diode Assembly
First Place ohmmeter scale on the X100 scale connect ohmmeter leads across a "B +" terminal and 3 stator terminals one at a time, reverse the leads, ohmmeter should show continuity in one direction only.
2 Again ohmmeter leads across negative and 3 stator terminals one by one.
Reverse the water,. Ohmmeter should show continuity in one direction only
3 Connect the ohmmeter leads across the "D +" terminal and 3 stator terminals one by one.
Reverse deals, ohmmeter should show continuity in one direction only, if the diode to be defective, replace the diode assembly.
image. 3:. Diode Assembly diode test circuit 55 amp alternator is shown, others similar to
1 Place the lowest ohmmeter, connect the ohmmeter across the stator leads, the resistance between the leads should be 14 15 ohms for a 55-amp alternator and 10 ohm 0.09 for 65-90 amp alternator, if the resistance is incorrect, the stator has an open or short between the windings and must be replaced.
2 Place ohmmeter scale on x 1000. Connect ohmmeter between stator core and stator water, no continuity should exist, if there is continuity, the stator is grounded and must be replaced.
1 Place the lowest ohmmeter, connect the ohmmeter across the slip rings, resistance should be 3 ohms from 4 to 3.75 for 55 amp alternator and 2.8 3.1 ohms for a 65-90 amp alternator.
2 If the resistance is too low, the rotor is short-circuit and must be replaced if the resistance is infinite there is no continuity, the rotor has an electrical circuit and must be replaced.
Third Place ohmmeter on x1000 scale, re-ohmmeter between either slip ring and rotor cores, no continuity should exist, if there is continuity, the rotor is grounded and must be replaced.
4 Clean the slip rings using very fine sandpaper, rings that are worn or pitted should be included lathes, the minimum ring diameter is 1 1 / 16 "26.8 mm if the slip rings are beyond repair, replace, slip rings as indicated in steps 5 and 6
4 Clean the slip rings using very fine sandpaper, rings that are worn or pitted should be included lathes, the minimum ring diameter is 1 1 / 16 "26.8 mm if the slip rings are beyond repair, replace, slip rings as indicated in steps 5 and 6 ...
6 Insert the ends of the windings in the rotor slip rings and press the new slip ring on the rotor, slip ring at the end must be 9 / 64 "3.5 mm from the end of the collar, soldering the rotor windings slip ring terminals, turn the rings on a lathe and retest rotor, the maximum slip ring run out of the 0012 ', 0.03 mm.
Bearings
Always replace the bearings, if you change the front bearing sealed on one side, open side must face the rotor, if the replacement of the rear bearing is sealed on one side, open side must face the rotor.
Brushes
Ensure brushes are longer than 6 m.m. Replace if necessary, unsolder the brush of a voltage regulator, solder the new brushes, and do not allow the solder to run into the water or brushes.
Brush must be free to fall into the holder with a normal spring tension of 10-14.
again
First Install the bearing retainer, and screws in front of the housing, press the rotor housing.
releases affect the slip ring end of rotor, stator solder diode assembly, be careful when soldering near the diode, due to possible heat damage.
2 Install bushings in the stator assembly, assemble the stator assembly and the back cover, install the wave washer or O ring in the rear housing, align the scribe marks and mounted front and rear housings.
3 Install the key, the fan assembly, and spacers, install the pulley, lock washer and nut, tighten the nut to 23-29 ft 3-4 Nm. Ensure the rotor spins freely, and install the voltage regulator and capacitor.
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