Miller Big Blue Duo Air Pak 800X Owner's Manual page 71

D. Engine
Trouble
Engine will not crank.
Engine cranks but does not start.
Engine starts, but stops when Engine
Control switch is released.
Engine hard to start in cold weather.
Engine suddenly stops.
Engine slowly stopped and cannot be
restarted.
Battery discharges between uses.
Engine idles, but does not come up to
weld speed.
Engine does not run at idle speed.
Engine uses oil during run-in period;
wetstacking occurs.
E. Air Compressor
Trouble
Air compressor does not operate; no air
pressure at air shutoff valve.
.
Complete Parts List available at www.MillerWelds.com
Supplementary protector CB2 open. Reset CB2.
Check battery connections and tighten if necessary. Check battery, and replace if necessary.
Circuit breaker CB10 may be open. CB10 automatically resets when fault is corrected (see Section 8-10).
Have Factory Authorized Service Agent check engine wiring harness and components.
Check engine wiring harness plug connections.
Have Factory Authorized Service Agent check control relay CR5 and Engine Control switch S1.
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 CR5. Have engine Factory Authorized
Service Agent check fuel pump and fuel system.
Air in fuel system. See engine manual.
Check oil level. Automatic shutdown system stops engine if oil pressure is too low or engine temperature
is too high (see Section 5-6). Automatic shutdown system is inhibited for 30 seconds after start-up.
Have Factory Authorized Service Agent check control relay CR5.
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 maintenance label and engine manual).
Check oil level. Automatic shutdown system stops engine if oil pressure is too low or engine temperature
is too high (see Section 5-6). Automatic shutdown system is inhibited for 30 seconds after start-up.
See engine manual.
Check fuel level.
Check engine air and fuel filters (see Sections 8-7 and 8-9).
See engine manual.
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).
Have engine Factory Authorized Service Agent check speed control.
Have Factory Authorized Service Agent check control relays CR3 and CR4/CR24.
Dry engine according to run-in procedure (see Section 14).
Place Air Compressor switch in On position. The air compressor will not start if still under pressure. If
compressor is turned off, wait for air pressure to bleed off (about 20 seconds) before turning compressor
on again.
Reset supplementary protector CB15 (see Section 9-4).
Check compressor belt tension. Be sure correct belt is used and is properly installed.
Verify secondary air/oil filter is not plugged. Replace air/oil separator.
Have Factory Authorized Service Agent check Air Compressor switch S10, control relay CR10, air pres-
sure switch S11, temperature switch S12, compressor control circuit, and air compressor clutch.
Remedy
Remedy
OM-267603 Page 67