Bobcat 741 - Page 136

MELROE ALTERNATOR
Checking the Alternator
Output
NOTE:
Checking procedure and connections are the
same
for 741, 742 & 743. The example shown
is 743.
A WARNING
Put jackstands under the front axles and rear
corners
of the frame before running the engine
for service. Failure
to use jackstands can allow
the machine to fall or move and cause injury or
death.
W-2017-0286
Lift and block the loader. (Refer to PREFENTIVE
MAINTENANCE
Section 1 for the correct procedure.) B
Disconnect the negative (-) cable from the battery.
Remove the
belt shield.
Disconnect the orange wire (Item 1) [A] from the
alternator. Connect that wi
re to the negative (-) side of the
ammeter.
Connect the positive
(+) side of the ammeter to the output
terminal on the alternator (Item 2) [A].
Close the fuel shutoff valve.
Connect the negative (-) cable to the battery.
Turn on the
lights and crank the engine for 30 seconds to
discharge the battery.
Open the fuel shutoff valve.
Start
the engine and run at 2600 RPM.
The ammeter reading
should be between 45 & 55 amps .
@ 2600 RPM.
If the reading is low, remove the screws and pull the
regulator cover away from the alternator.
Disconnect the battery and connect a jumper wire from
the alternator output
terminal (Item 1) [B] to the regulator
terminal (Item
2) [B).
Connect the battery
cable, start the engine and check the
ammeter.
If the reading is within the rated amperage
(45-55 amps.
@ 2600 RPM) replace the diode trio.
-6-9-
B-09570
741, 742, 743, 74305 Bobcat Loader
Service Manual