Miller Big Blue 450X Duo CST, Owner'S Manual

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Complete Parts List available at www.MillerWelds.com
OM-247969 Page 46
B. 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 pump, and Fuel/Hour gauge
FUEL/HM.
Air in fuel system. See engine manual.
Engine hard to start in cold weather. Use Preheat switch S4 (see Section 6-2).
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 8-1).
Have Factory Authorized Service Agent check Preheat switch S4, control relay CR3, and the glow
plug.
Engine suddenly stops. Check oil, fuel, and coolant levels. Automatic shutdown system stops engine if oil pressure is too low, fuel
is low, or coolant temperature is too high (see Sections 5-6 and 5-7).
Check fuel/hour meter for indication of shutdown.
Reset supplementary protector CB2 and/or clear fault causing circuit breaker CB1 to trip (see Section
8-10). Have Factory Authorized Service Agent check engine alternator, fuel pump, and engine har-
ness.
Have Factory Authorized Service Agent check Engine Control switch S1, control relay CR1, inte-
grated rectifier SR2, and the fuel pump.
See engine manual.
Engine slowly stopped and cannot be
restarted.
Check fuel level.
Check fuel/hour gauge FUEL/HM for indication of shutdown.
Check engine air and fuel filters (see Sections 8-4 and 8-9).
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 uses oil during run-in period;
wetstacking occurs.
Dry engine according to run-in procedure (see Section 11).