Lincoln Electric SVM194-A Engine RPM Adjustment Test Procedure, Classic 300D Perkins only

F-32	TROUBLESHOOTING AND REPAIR	F-32
	ENGINE RPM ADJUSTMENT TEST PROCEDURE (continued)

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PROCEDURE

1. Turn the engine off.

2. Place the RPM adjustment potentiometer or "Custom Arc" control to maximum (Classic® 300G and Classic® 300D Kubota models only.)

3. Open the side door.

NOTE: Secure the door in the open position using the door restraint system. If the machine does not have a door restraint system, remove the door or securely restrain it to prevent it from falling closed.

Classic® 300D Perkins only:

Check that the linkage attaching the solenoid to the engine speed control lever is properly aligned and in good condition.

Strobe-Tach Method:

Place a highly visible mark on the engine crank- shaft pulley, or another rotating component con- nected to the engine crankshaft.

Connect the strobe-tach according to the manufac- turer's instructions.

Start the engine and place the idle switch in the "HIGH IDLE" position. Make sure that there is no load on the machine and allow the engine RPM to stabilize.

Direct the strobe-tach light on the highly visible mark that had been applied earlier and synchro- nize the light with the rotating mark. See the strobe-tach manufacturer's instructions.

The tach should read between 1790 and 1810

RPM

Move the idle switch to the "AUTO IDLE" position and wait for the engine RPM to drop and stabilize at the low idle RPM.

Synchronize the strobe-tach to read the low idle RPM.

The tach should read as follows:

• 1325 to 1475 for Classic® 300G and Classic® 300Ds powered by the Perkins 104.22 engines.

• 1350 to 1450 for Classic® 300Ds powered by other Perkins engines

• 1390 to 1410 for Classic® 300D Kubota models. If either of the readings is incorrect, proceed to the

"ENGINE RPM ADJUSTMENT PROCEDURE" later in this section.

Frequency counter method:

NOTE: A dedicated frequency counter can be used for this test, but many high quality digital multimeters also have this function, and can be easily utilized. See the manufactur- er's instructions for your frequency counter or multimeter.

Set your frequency counter per the meter manu- facturer's instructions, and plug the probes into one of the 120VAC auxiliary receptacles.

Start the engine and place the idle switch in the "HIGH IDLE" position. Make sure that there is no load on the machine and allow the engine RPM to stabilize.

The frequency should read between 59.7 and 60.3 Hz.

Move the idle switch to the "AUTO IDLE" position and wait for the engine RPM to drop and stabilize at the low idle RPM.

The frequency counter should read as follows:

• 44.2 to 49.2 Hz. for Classic® 300G and Classic® 300Ds powered by the Perkins 104.22 engines.

• 45 to 48.3 Hz. for Classic® 300Ds powered by other Perkins engines

• 46.3 to 47 Hz. for Classic® 300D Kubota models. If either of the readings is incorrect, proceed to the

"ENGINE RPM ADJUSTMENT PROCEDURE" later in this section.

NOTE: For Lincoln Electric 1800 RPM (4 Pole) machines, that have 60 Hz AC auxiliary power; the engine RPM can be determined by multiplying the frequency of the auxiliary power output, in Hz. By 30. (Example: 60 Hz. * 30 = 1800 RPM)

CLASSIC® 300D & 300G