Miller Bobcat 200 Air Pak Diesel Owner's Manual page 66

Trouble
Compressor operates, but air pressure
is low.
High air pressure.
Oil in air from compressor.
Engine does not idle with compressor
on.
Air compressor overheats. Display
reads "AC TEMP."
OM-281710 Page 62
.
A complete Parts List is available at www.MillerWelds.com
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 6-4).
Reduce air demand/close air outlet valve.
Run compressor to increase temperature above freezing.
Check for frozen lines or hoses downstream from compressor outlet.
Blowdown valve is frozen. Run compressor to build heat and blowdown valve will return to normal opera-
tion.
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 6-4).
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.
Change compressor air/oil separator if close to replacement hours (see Section 11-3).
Wrong or mixed oil results in foaming which can cause oil in air. If mixed oil is suspected, replace oil, oil
filter, and air/oil separator.
Have Factory Authorized Service Agent check for plugged oil scavenge line.
Remove auxiliary power or other loads. Multiple loads keep engine at high speed.
Wait 45 seconds after air output stops for engine to idle. Verify case pressure reduces during this time.
Check for air leaks downstream of compressor. Any air leak will cause output pressure to reduce and the
compressor to engage.
When pressure reduces in case, verify clutch disengages 45 seconds after air output stops. If it does
not, check for air leaks.
Check that all covers, panels, and doors are in place during operation.
Check compressor oil level (see Section 5-4). Low oil level causes increased compressor temperature.
Automatic shutdown stops compressor if compressor temperature is too high.
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/clean oil cooler.
Verify adequate air flow to compressor. Check for blocked air intake.
Adjust compressor air pressure (see Section 6-4).
Replace compressor oil filter (see Section 11-3).
Wrong oil or mixed oil. Drain oil and replace with factory oil and filter.
Have Factory Authorized Service Agent check temperature sensor.
Remedy