BE Pressure supply 80 Gallon Enclosed Rotary Screw Compressor AC1080SQ - Manual (Page 25)

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Oil Return Sight Glass
During loaded operation there should be a visible flow in the sight glass.
If there are no droplets visible then the orifice in this line needs to be
checked for plugging. Oil not returned ends up in the plant air system.
Minimum Pressure Valve
Then minimum pressure valve is a non-adjustable spring biased check
valve. It has been designed to maintain a minimum sump pressure of 85
PSI. If the pressure is allowed to get too low, the oil carryover rate
will increase and the separator could be damaged.
Fan
Check the fan for cracking, loose rivets, and bent or loose blades. Make
sure that it is securely mounted and tighten the mounting screws if loose.
Replace a damaged fan immediately.
To Check the Belts
1. Switch off the unit and disconnect the power to prevent accidental
restarting.
2. Allow one minute after stopping the compressor for settling and the
pressure to relieve.
3. Remove the belt guard.
4. Inspect for any fraying or cracking of the belts. If there is any, replace
the belts.
5. Check the tension. It should be about 1/64” per inch of span between
the sheaves
6. To Change the Belts, switch off the unit and disconnect the power to
prevent accidental restarting.
7. Allow one minute after stopping the compressor for settling and the
pressure to relieve.
8. Remove the belt guard.
9. Loosen the motor hold down bolts and the puller bolt and slide the
motor toward the air end.
10. Remove the belt.
11. Replace with new belt.
12. Set the initial by sliding the motor back to its original position using
the puller bolt and tighten the motor hold down bolts.
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operation