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F-18

TROUBLESHOOTING AND REPAIR

F-18

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

 

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

The machine will not idle down

FUNCTION PROBLEMS

 

 

 

If the machine idles down

 

to low RPM when weld and

 

after the sensor is unplugged,

 

auxiliary loads are removed.

 

check the wiring between the

 

The machine has normal weld

 

PC board and toroidal current

 

and auxiliary output. The engine

 

sensor for damaged insulation

 

starts and shuts down normally.

 

and electrical contact with

 

(Continued)

 

 

other electrically live

 

 

 

components. (See the wiring

 

 

 

 

diagram)

If the wiring is

 

 

 

 

good, there is likely a load on

 

 

 

 

the auxiliary circuit. Check all

 

 

 

 

wiring and components in the

 

 

 

 

AC auxiliary circuit. (See

 

 

 

 

wiring diagram)

 

 

 

 

If the machine still will not

 

 

 

 

idle down, check all wiring

 

 

 

 

connected to the solenoid.

 

 

 

 

See the wiring diagram. Look

 

 

 

 

for damaged wiring, poor

 

 

 

 

connections, dirty or corroded

 

 

 

 

terminals, etc. If all of the

 

 

 

 

wiring is good, replace the PC

 

 

 

 

board.

 

 

 

 

 

 

For Classic® 300G and

 

 

 

 

Kubota powered units:

 

 

 

 

Unplug the current sensor PC

 

 

 

 

board.

 

 

 

 

 

 

If the machine will not idle

 

 

 

 

down, check all the wiring

 

 

 

 

connecting to the current

 

 

 

 

sensor.

 

 

 

 

 

 

If all the wiring is good,

 

 

 

 

replace the engine control

 

 

 

 

unit.

 

 

 

 

 

 

If the engine idles down when

 

 

 

 

the sensor is disconnected,

 

 

 

 

reconnect the sensor, then

 

 

 

 

disconnect the leads that loop

 

 

 

 

through the current sensor

 

 

 

 

sensing unit. (See wiring

 

 

 

 

diagram)

 

 

 

 

 

 

If the engine does not idle

 

 

 

 

down, replace the current

 

 

 

 

sensor PC board.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

CLASSIC® 300D & 300G

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Lincoln Electric SVM194-A service manual For Classic 300G, Kubota powered units
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