Pulley / Sheave Alignment & Belt Tension - Quincy Compressor Industrial Series Instruction Manual

Pulley / Sheave Alignment & Belt Tension
Industrial / Air Master Series
50161-105, March 2008
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
Cross Dia. Range
Section
A QT-54 only
B
B
B
B
29
Fig. 5-1
Setting Belt Tension
Deflection Force (lbs.)
(inches) Minimum
4.6
5.0 - 5.4
5.6 - 6.4
6.8 - 9.4
3501 Wismann Lane, Quincy Ill. - 62305-3116
Pix 1152
Recommended
Maximum
2 3
4.0 5.9
4.5 6.7
5.0 7.4
5.8 8.6
Quincy Compressor