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Drive Belts and Sheaves
Blower Bearing
Lubrication
Check for belt ride in the groove. In multiple groove drives, belt ride should be
uniform. Check groove wear area for wear. Side wall of groove should be
straight, not dished out. Bottom of groove should show no signs of belt
contact.
Sheave alignment, set screw torque and belt tension should be checked after
8, 24, and 100 hours of initial start-up. Visually inspect belts and sheaves for
excessive wear. If belts have a slick, glazed look, the belts are slipping. Check
drive capacity and belt tension. Never replace only one belt in a used set, as
used belts will elongate. Replace the entire set if replacement is necessary.
See Page 62, Section 20.2.1 and Page 63, Section 20.2.2.
Blowers with spider bracket bearings are pre-lubricated and do not require
any re-lubrication during their entire service life. Blowers that use pillow block
bearings; should be re-lubricated per the chart below. The recommended
lubricant is Shell Alvania #2 or S3 grease. To re-lubricate the blower pillow
block bearings, be sure that the grease fittings on the bearing housing (or air
handler cabinet wall in the case of extended grease lines) are clean. Apply
the recommended grease to the fitting with a low-pressure grease gun and
add slowly while the shaft is spun by hand. Do not over-grease. Over-greasing
will reduce the service life of the bearings. Consult the blower manufacturer
for grease capacity recommendations as capacities vary by model.
Use a No.2 Lithium complex base grease or equivalent
Hours Run
Per Day
8
16
Lubrication Schedule
Suggested Lubrication Period in Weeks
251 to 500
501 to 750
RPM
RPM
12
10
7
5
SECTION 21: M
AINTENANCE
751 to 1000
RPM
7
4
71
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