Product Manual

CAP881
36
Checking Oil Level and Adding Compressor Oil
1. Turn off the unit; disconnect the power, and lockout and tagout to prevent accidental restarting.
2. Allow one minute after stopping the compressor for settling and the pressure to relieve.
3. Remove any dirt from around the fill cap, and then remove the fill cap.
4. Inspect the cap for damage and cleanliness. Replace if necessary.
5. The oil should be visible in the window by the oil fill port on the side of the airend.
6. Replace the cap securely. Never put the cap on without tightening it immediately.
Changing Compressor Lubricant
1. Turn off the unit; disconnect the power, and lockout and tagout to prevent accidental restarting.
2. Allow one minute after stopping the compressor for settling and the pressure to relieve.
3. Remove any dirt from around the fill cap, and then remove the fill cap. If the lubricant appears
dirty or has a foul smell it should be replaced.
4. Drain the lubricant from the bottom of the oil receiver using both ball valves. Oil will drain more
quickly and completely if it is warm from operation.
5. Close all drains and replace with fresh compressor oil to the proper level.
6. Replace the fill cap and run the unit.
7. Switch off the unit and disconnect the power to prevent accidental restarting.
8. Allow one minute after stopping the compressor for settling and the pressure to relieve.
9. Remove the fill cap to see if more lubricant should be added and to insure that there are no leaks.
6.7 Thermostatic Valve
The thermostatic valve is a non-adjustable temperature control valve. On the compressor we use this
valve to mix hot and cold oil. It will begin to open at 150-155
o
F and be fully open at 170
o
F. This
insures that the system temperature is above the pressure condensation point and there is minimal
accumulation of water.
6.8 Minimum Pressure Valve
The minimum pressure valve is a non-adjustable spring biased check valve. It has been designed to
maintain a minimum sump pressure of 65 psig. If the pressure is allowed to get too low, the oil
carryover rate will increase and the separator could be damaged.
Air exiting the vent hole in the cap of the valve indicates an o-ring failure and it needs to be replaced.
The air leaking into the spring cavity where the vent is located will change the operation of the valve.
6.9 Belts
Routine examination of the drive system is recommended to insure maximum compressor life. The
belts need to be checked for wear and stretch.
To check the belts:
Turn off the unit; disconnect the power, and lockout and tagout to prevent accidental restarting.
Allow one minute after stopping the compressor for settling and the pressure to relieve.
Remove the belt guard.
Inspect for any fraying or cracking of the belts and replace if present.