M11 Series – Service Manual – 013-001   Alternator

Connect a carbon pile load (battery tester) across the batteries in one of the battery boxes.

Clamp an induction pickup type ammeter around the battery cable, or use digital multimeter, Part No. 3377161, with clamp or current probe, Part No. 3823574.

Disconnect any cables that lead to any other battery boxes in the circuit.

Operate the engine at high idle, and measure the alternator voltage output to the batteries with digital multimeter, Part No. 3377161. Refer to the equipment manufacturer’s specifications.

Operate the engine at high idle and adjust the battery tester to apply the maximum rated amperage load to the alternator. Refer to the manufacturer’s specifications.

NOTE: The alternator maximum rated amperage output is normally stamped or labeled on the alternator.

Measure the alternator amperage output. Refer to the alternator manufacturer’s specifications.

If the gauge on the carbon pile load testing equipment does

not indicate approximately the same output as the induction-type ammeter, determine which is defective and replace it. Refer to the equipment manufacturer instructions.

If the alternator output (amps) is

not within 10 percent of rated output, repair or replace the alternator. Refer to the manufacturer’s instructions for repair procedures.

Shut off the engine, and remove the test equipment.

Loosen the adjusting screw locknut (1).

Loosen the retaining nut (2).

Loosen the alternator mounting capscrew (3).

Turn the adjusting screw

counterclockwise to release tension
(4).

Remove the alternator belt.

Remove the adjusting link mounting capscrew(3) and the adjusting link.

Remove the alternator mounting capscrew(1), nut, washer(2), and alternator.

Install the adjusting link and mounting capscrew(3).

Install the alternator, capscrew(1), washer, and nut(2) to the mounting bracket and adjusting link.

NOTE: Do

not tighten the capscrews and nuts until the alternator belt is installed and adjusted.

Install and adjust the alternator belt.

Refer to Procedure 013-005.