Troubleshooting and repair, Electronic governor test (continued) – Lincoln Electric VANTAGE SVM178-B Manuel d'utilisation

Page 232

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ELECTRONIC GOVERNOR TEST (CONTINUED)

TEST PROCEDURE

CHECK CONTROLLER

1. Turn the Run/Stop switch to Run. Do not start

engine.

2. The engine protection light should be ON for 5 sec-

onds then go out.

3. After 30 additional seconds the light should come

back on.

4. If a-c or 1-3 are OK then the controller is probably

good.

5. If the engine protection light stays ON, controller

may be defective.

6. Turn the Run/Stop switch to Stop.

CHECK FUEL CONTROL LEVER

ACTUATOR

1. Disconnect leads 270 and 271 from actuator leads.

2. Measure 2 to 2.5 ohms between actuator leads.

3. Reconnect leads 270 and 271 to the actuator

leads.

CHECK MAG PICK-UP

1. Disconnect shielded cable leads from the magnet-

ic pick-up leads.

2. Measure 200-220 Ohms between the mag pick-up

leads.

3. Set the voltmeter for VAC with a max scale of 4

volts.

4. Disconnect leads 262 from the fuel solenoid so the

engine cannot start.

5. Measure 1 to 2 VAC while engine is cranking.

6. If ohms and volts are OK mag pick-up is working

properly.

7. If ohms are OK, but the voltage is less than 1 volt

mag pick-up may be defective or need adjustment.

8. Correct adjustment of pick-up is .015 to .020 inch

gap from flywheel teeth (approx. 1/2 turn from just
touching the teeth).

9. Reconnect shielding cable leads to mag pick-up

leads and lead 262 to engine fuel solenoid.

CHECK AND ADJUST FUEL CONTROL LEVER AND
ACTUATOR LINKAGE

1. Disconnect actuator linkage rod from fuel control

lever at injection pump.

2. Loosen lock nut on fuel lever off stop screw.

3. Adjust fuel lever stop screw clockwise (down) until

engine will just start and run slowly while holding
fuel lever against stop screw. CAUTION: DO NOT
ALLOW FUEL LEVER TO GO FULL ON AS
ENGINE OVERSPEED WILL OCCUR.

4. While holding fuel lever against the stop screw

slowly turn stop screw counterclockwise (up) until
engine just stops. Adjust additional 1/2 turn up and
tighten lock nut.

5. Check actuator for freedom of movement and

proper return spring operation. Linkage should not
bind or rub on anything.

6. Adjust actuator rod length so that at rest the attach-

ment hole lines up with the hole in the fuel control
lever when it is against the off stop. Shorten the
rod by 1 to 2 turns of the adjustment clevis and
reattach to the fuel control lever.

7. At rest the actuator should just hold the fuel con-

trol lever against the off stop.

8. If the rod is too long engine speed regulation can

be sluggish, overspeeding can occur and engine
protection function may not work.

9. If the rod is too short, engine starting may be diffi-

cult or impossible.

10. Repeat steps until engine starts and stops proper-

ly.

11. For a final check of the linkage while engine is run-

ning manually push and hold actuator linkage
against fuel lever off stop and verify engine does
stop.

TROUBLESHOOTING AND REPAIR

F-44