Miller Big Blue 300 PRO Series, Owner'S Manual

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Complete Parts List is available at www.MillerWelds.com
OM-259 355 Page 52
C. Engine
Trouble Remedy
Engine will not crank. Check battery, and replace if necessary.
Check battery connections and tighten if necessary.
Circuit breaker CB1 may be open. CB1 automatically resets when fault is corrected (see Section 8-10).
Have Factory Authorized Service Agent check engine wiring harness and components.
Reset supplementary protector CB2 (see Section 8-10).
Check engine wiring harness plug connections.
Have Factory Authorized Service Agent check Engine Control switch S1, fuel/hour gauge FUEL/HM, and
control relay CR2.
Engine cranks but does not start. Check fuel level.
Check battery and replace if necessary. Check engine charging system according to engine manual.
Have Factory Authorized Service Agent check control relay CR1, fuel/hour gauge FUEL/HM, fuel
solenoid FS1, and the fuel pump.
Air in fuel system. See engine manual.
Engine hard to start in cold weather. Use Preheat switch (see Section 6-1).
Keep battery in good condition. Store battery in warm area off cold surface.
Use fuel formulated for cold weather (diesel fuel can gel in cold weather). Contact local fuel supplier for
fuel information.
Use correct grade oil for cold weather (see Section 8-2).
Have Factory Authorized Service Agent check Preheat switch S4, control relay CR3, and the glow
plug.
Engine suddenly stops. Check oil and coolant levels. Automatic shutdown system stops engine if oil pressure is too low or coolant
temperature is too high (see Section 5-7 ).
Check fuel/hour gauge for indication of shutdown.
Circuit breaker CB1 may be open. CB1 automatically resets when fault is corrected (see Section
8-10). Reset supplementary protector CB2 (see Section 8-10). Have Factory Authorized Service
Agent check engine alternator, engine harness, throttle solenoid TS1, fuel solenoid FS1, and the fuel
pump.
Have Factory Authorized Service Agent check Engine Control switch S1, control relay CR1, inte-
grated rectifier SR2, fuel solenoid FS1, and the fuel pump.
See engine manual.
Engine slowly stopped and cannot be
restarted.
Check fuel level.
Check fuel/hour gauge for indication of shutdown.
Check engine air and fuel filters (see Sections 8-4 and 8-11).
See engine manual.
Battery discharges between uses. Turn Engine Control switch off when unit is not running.
Clean top of battery with baking soda and water solution; rinse with clear water.
Recharge or replace battery if necessary.
Periodically recharge battery (approximately every 3 months).
Engine idles, but does not come up to
weld speed.
Have Factory Authorized Service Agent check fuel/hour gauge and current transformer CT1.
Engine does not run at idle speed. Have Factory Authorized Service Agent check fuel/hour gauge, and control relay CR4.
Engine uses oil during run-in period;
wetstacking occurs.
Dry engine according to run-in procedure (see Section 11).