Product Manual

Industrial / Air Master Series Quincy Compressor
50161-105, March 2008 29 3501 Wismann Lane, Quincy Ill. - 62305-3116
Pulley / Sheave Alignment & Belt Tension
Improper pulley/sheave alignment and belt tension are causes for motor
overloading, excessive vibration, and premature belt and/or bearing failure. To
prevent this from happening, check the pulley/sheave alignment and belt
tension on a regular basis (refer to SECTION 5, Maintenance Schedule).
Periodically inspect the motor pulley(s) and compressor sheave(s) for oil,
grease, nicks or burrs. Clean or replace if necessary. Make sure they are
securely fastened. Align the compressor sheave with the motor or engine pulley.
Drive belt grooves of the pulley(s) and sheave(s) should be in line with each
other. The compressor crankshaft must be parallel to the motor or engine drive
shaft.
Belt tension should be measured and adjusted to provide smooth operation.
Step-by-step procedures are provided here to correctly measure and set the
drive belt tension:
Step 1) Measure the span length of the drive. (Refer to Fig. 5-1, Setting
Belt Tension.)
Belt Motor Pulley Recommended
Cross Dia. Range Deflection Force (lbs.)
Section (inches) Initial Install. Minimum Maximum
3.0 3.6 2.4 3.1
A 3.1 - 4.0 4.2 2.8 3.6
4.1 - 5.0 5.2 3.5 4.6
5.1 6.1 4.1 5.3
4.6 7.3 4.9 6.4
B 4.7 - 5.6 8.7 5.8 7.5
5.7 - 7.0 9.3 6.2 8.1
7.1 10.0 6.8 8.8
Pix 1152
Fig. 5-1
Setting Belt Tension