Troubleshooting - Miller Bobcat 200 Air Pak Owner's Manual

11-8. Troubleshooting

A. Compressor Troubleshooting
Trouble
Air compressor does not operate; no air
pressure on gauge; no
engagement.
Air compressor stops producing air, or
air compressor cycles on and off.
Compressor operates, but air pressure
is low.
High air pressure.
Oil in air from compressor.
OM-276207 Page 46
.
A complete Parts List is available at www.MillerWelds.com
Place Air Compressor switch in an On position. If compressor is turned off, wait for air pressure to bleed
clutch off before turning compressor on again.
Pressure downstream of compressor outlet keeps compressor from engaging. Compressor will engage
when outlet pressure reduces.
Check for over pressure. Check adjustable pressure switch setting and reduce if necessary (see Section
7-2). Turn Air Compressor switch off to reset.
Check for over temperature. Allow unit to cool. 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.
Check compressor belt and tension. Be sure correct belt is used and is properly installed. Replace belt
if damaged or worn.
Have Factory Authorized Service Agent check air compressor control circuit and clutch.
Compressor idle down causes compressor to turn off when set pressure is reached. See Section 7-2.
During air use, compressor pressure will decrease 25 psi from set pressure, then increase to set
pressure.
Check for over pressure. Check adjustable pressure switch setting and reduce if necessary (see Section
7-2). Turn Air Compressor switch off to reset.
Check compressor oil level (see Section 5-5). Automatic shutdown stops compressor if compressor tem-
perature is too high.
Check for over temperature. Allow unit to cool. 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.
Have Factory Authorized Service Agent check and clean compressor cooler core. Automatic shutdown
stops compressor if compressor temperature is too high.
Verify adequate air flow to compressor. Check for blocked air intake.
Have Factory Authorized Service Agent check operation of over pressure switch S2.
Check for leaks in air lines and hoses.
Adjust compressor air pressure (see Section 7-2).
Reduce air demand/close air outlet valve.
Run compressor to increase temperature above freezing.
Check for frozen lines or hoses downstream from compressor outlet.
Have Factory Authorized Service Agent check engine speed, and adjust if necessary.
Check air compressor air cleaner (see Section 11-3).
Check compressor oil level (see Section 5-5).
Check air/oil separator, and replace if plugged (see Section 11-3).
Check compressor belt and tension. Be sure correct belt is used and is properly installed. Replace belt
if damaged or worn.
Have Factory Authorized Service Agent check solenoid blow down valve, and for leaks in control lines.
Also check air compressor for rated output.
Check air compressor gauge. Adjust compressor air pressure (see Section 7-2).
Check for frozen control lines.
Check compressor oil level (see Section 5-5). If oil level is too high, system becomes saturated with oil.
Open line (nothing connected to compressor outlet) will result in oil in air. Do not operate with open air
line.
Remedy