Compressor Troubleshooting - Miller TRAILBLAZER 302 AIR PAK Owner's Manual

Trouble
Battery discharges between uses.
Engine stopped during normal
operation.
Engine does not return to idle speed.
Engine does not remain at weld/power
speed when power or weld load is
applied with Engine Control switch in
Auto Speed position.
During operation in near freezing tem-
peratures, engine starts and goes to
idle but stalls after a few minutes.
During operation in severe cold weath-
er, engine starts and goes to idle but
stalls after a few minutes.

12-6. Compressor Troubleshooting

Trouble
Air compressor does not operate; no air
pressure on gauge.
Air compressor stops with air demand.
Place Engine Control switch in Off position when unit is not running.
Clean top of battery with baking soda and water solution; rinse with clear water.
Periodically recharge battery (approximately every 3 months).
Replace battery.
Check voltage regulator according to engine manual.
Check fuel level (see Section 5-4).
Check oil level (see Section 5-4). Low oil pressure shutdown stops engine if oil pressure is too low.
Oil level too high reduces capacity of the fuel pump.
Have Factory Authorized Service Agent check fuel shutoff solenoid GS1 according to engine manual.
Have Factory Authorized Service Agent check low oil pressure shutdown switch S5.
Be sure Engine Control switch S2 is in Auto Speed position.
Remove all weld and generator power loads.
Place Process/Contactor switch in Electrode Hot position or turn off remote contactor. The unit will not
return to idle speed when Process/Contactor switch is in a remote position and the remote contactor
is on.
Turn off remote device connected to Remote receptacle RC4 (see Section 5-11).
Have Factory Authorized Service Agent check circuit board PC1 and current transformer CT1.
Place Engine Control switch in the Run position for small loads.
Treat fuel with isopropyl alcohol de-icer product.
Place Engine Control switch in the Run position until unit has been in operation and loaded for a peri-
od of time.
Install engine manufacturer's kit for cold-weather operation.
Place Air Compressor switch in an On position. If compressor is turned off, wait for air pressure to bleed
off before turning compressor on again.
Allow supplementary protector CB5 to reset. (CB5 automatically resets when it cools.) If CB5 continues
to open, contact Factory Authorized Service Agent.
Check compressor belt and tension. Be sure correct belt is used and is properly installed. Replace belt
if damaged or stretched.
Have Factory Authorized Service Agent check Air Compressor control circuit and clutch.
Check compressor oil level (see Section 5-4). Automatic shutdown stops compressor if compressor tem-
perature is too high.
Verify adequate air flow to compressor. Check for blocked air intake. Recirculation or open covers may
cause overheating. Be sure all covers, panels, and doors are in place. Operate in area with proper airflow.
Automatic shutdown stops compressor if compressor temperature is too high.
Replace compressor oil filter (see Section 11-5).
Have Factory Authorized Service Agent check compressor cooling fan and clean compressor cooler
core. Automatic shutdown stops compressor if compressor temperature is too high.
.
A complete Parts List is available at www.MillerWelds.com
Remedy
Remedy
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