Miller Electric Legend AEAD-200LE Technical Manual page 21

D. Engine
Trouble
Engine will not start.
Engine starts but stops as soon as En-
gine Control switch S2 returns to Run
position.
Engine stopped during normal opera-
tion.
Battery discharges between uses.
Engine idles, but does not come up to
weld speed.
Engine does not return to idle speed.
Unstable or sluggish engine speeds.
Miller Legend
Check fuel level (see Section 2-4).
Check battery and engine charging system according to engine manual.
Check continuity of Engine Control switch S2, and replace if necessary.
See engine manual.
Check oil level (see Section 2-4). Check low oil pressure shutdown switch S3 (see engine parts manual
for location). S3 should close when engine is running.
Check and refill crankcase with proper viscosity oil for operating temperature, if necessary (see engine
manual).
Check continuity of Engine Control switch S2, and replace if necessary.
Check oil level (see Section 2-4). Check low oil pressure shutdown switch S3 (see engine parts manual
for location). S3 should close when engine is running.
Check continuity of Engine Control switch S2, and replace if necessary.
Make sure Engine Control switch S2 is placed in the Off position when engine is not in use (see Section
3-1).
Prior to Serial No. KA780044, check fuse F2 and replace if necessary.
Clean battery, terminals and posts with baking soda solution; rinse with clear water.
Periodically recharge battery (approximately every 3 months).
Check voltage regulator according to engine manual.
Replace battery.
Wait 10 seconds for throttle solenoid circuit breaker CB4 to reset (see Section 8-6).
Place Idle Lock switch S1 in Unlock position (see Section 3-1).
Check continuity and connections of current transformer CT1, and replace if necessary.
Check continuity of Engine Control switch S2, and replace if necessary.
Check coil voltage and connections of control relay CR2. Check continuity of coil and condition of con-
tacts. Replace CR2 if necessary.
Check diode D6 in throttle solenoid TS1 circuit, and replace if necessary.
Check resistance at throttle solenoid TS1 terminals. With plunger out, resistance is less than 1 ohm.
With plunger bottomed, resistance is 17 ohms 10%.
Check throttle linkage for smooth, non-binding operation.
Check idle board/module PC1 and connections, and replace if necessary (see Section 6-5).
Remove weld load.
Check continuity of Engine Control switch S2, and replace if necessary.
Check throttle linkage for smooth, non-binding operation.
Readjust throttle linkage if necessary.
Tune-up engine according to engine manual.
Remedy
TM-428 Page 17