20
05
Installation
Manual 2006 Rev B p/n 2006
V-Belts
If the motor and blower are V-belt connected, the
sheaves on both the motor and blower shafts
should be as close to the shaft bearings as
possible. Blower sheave is not more than 1/4 in.
(6.5 mm) from the blower drive end cover. The
drive sheave is as close to the driver bearing as
possible. Take care when installing sheaves on
the blower and motor shafts. Make sure the face is
accurately in line to minimize belt wear.
Adjust the belt tension to the manufacturer’s
specifications using a belt tension tester. Check
new belts for proper tension after 24 hours of run
time. When manufacturer data is not available,
industry guidelines recommend 1/64 in. deflection
for each inch of span (0.157 mm deflection per
centimeter of span) at 8 – 10 lb (3.6 – 4.5 kg) of
force in the center of the belt.
Insufficient tensioning is often indicated by slipping
(squealing) at start-up. Do not use belt dressing
on V-belts. Keep sheaves and V-belts free of oil
and grease. Remove tension from belts if the
drive is to be inactive for an extended period of
time. For more specific information, consult the
drive manufacturer. In a V-belt drive, the blower
sheave must fit its shaft accurately, run true, and
be mounted as close to the bearing housing as
possible to minimize bearing loads.
A tight or driving fit will force the drive shaft out of
its normal position and cause internal damage. A
loose fit will result in shaft damage or breaking.
Make sure the motor sheave fits correctly and is
properly aligned with the blower sheave.
Adjust the motor position on its sliding base
so that belt tension is in accordance with drive
manufacturer’s instructions. Always avoid
excessive belt tension. Recheck tension after
the first 10 hours of operation and periodically
thereafter to avoid slippage and loss of blower
speed.
Too Tight
Slight Bow
Too Loose
20/64” = 5/16”
(8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Figure 5-5 – General appearance of a V-belt drive
Too Tight
Slight Bow
Too Loose
20/64” = 5/16”
(8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Figure 5-6 – Setting of proper tension for a V-belt drive
Check the blower after installation and before
applying power by rotating the drive shaft by hand.
If the drive shaft does not rotate freely:
• Look for uneven mounting, piping strain,
excessive belt tension, or coupling misalignment
•
Check the blower to make sure oil was added to
the reservoirs
Setting V-Belt Tension
Proper belt tension is essential to long blower
life.
Figure 5-5
,
Figure 5-6
, and the following
procedure are provided to aid in field-adjusting
V-belts (when the blower is so equipped) for
maximum performance. A visual inspection of the
V-belt drive should yield the appearance shown in
Figure 5-5
.
Factors outside the control of the belt tensioning
system used on an individual blower package
assembly, such as environmental factors and
quality of the belts installed, may contribute to
decreased belt life. Such factors can cause wear
of the belts beyond the ability of the tensioning
system to compensate.
Содержание M-D Pneumatics PD Plus
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