Service manual

ALTERNATOR
Alternator Output Test
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 (See Page 1–1).
Disconnect the negative (–) cable from the battery.
Disconnect the red wire (Item 1) [A] from the alternator.
Connect the wire to the negative (–) side of the ammeter.
Connect the positive (+) side of the ammeter to the output
terminal on the alternator (Item 1) [A].
Disconnect the fuel stop solenoid connector.
Connect the negative (–) cable to the battery.
Turn on the lights and crank the engine for 30 seconds to
discharge the battery.
Connect the fuel stop solenoid, start the engine and run
at 2600 RPM.
If ammeter reading is between 45–55 amps. @ 2600
RPM the alternator is good and no further testing is
needed.
If the reading is low, remove the screws and pull the
regulator cover away from the alternator and continue
testing (below).
Rectifier (Diode) Test
Disconnect the negative (–) cable from the battery.
Install the wire in their original location on the back of the
alternator.
Connect a jumper wire (Item 1) [B] to the alternator output
terminal and the regulator terminal.
Connect the battery negative (–) cable.
Start the engine and run at 2600 RPM.
If the reading is within 45–55 amps. @ 2600 RPM replace
the rectifier (diode) assembly or replace the alternator.
If the reading is low, do the Alternator Regulator Test.
NOTE: The alternator is removed from the loader for
clarity purposes.
A
P–4944
1
B
P–1304
1
Output
Terminal
Regulator
Terminal
–6–10–
853, 853H Loader
Service Manual