Product Manual

CAP881
37
Check the tension. The deflection should be about 1/64” per inch of span between the sheaves with
about 4 pounds of force perpendicular to the belt.
To change the belts: (SEG-5 thru SEG-15)
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 the belt guard.
4. Release tension by loosening the 2 tension bolts for the pulley.
5. Remove belts
6. Install new belts.
7. Tighten the 2 tensioning bolts and reset the tension on the belts.
6.10 Sheave Alignment
Any degree of sheave misalignment will result in a reduction of belt life. Misalignment whether parallel
or angular should not exceed 1/16”.
Parallel misalignment occurs when the shafts are parallel, but the face of the sheave is not in alignment.
Angular misalignment occurs when the shafts are not parallel.
An easy and effective method for checking the alignment in both directions is to use an accurate straight
edge.
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 the belt guard.
4. Lay the straight edge across the face of the motor sheave and check the alignment with the air end
sheave.
5. Then lay the straight edge across the face of the air end sheave and check the alignment with the motor
sheave.
6. If the alignment gap is greater than 1/16” in either direction, loosen the belts as outlined in changing
belts section and align the sheaves.
7. Reset the tension on the belts