Greenheck Vektor-MH Installation, Operation And Maintenance Manual page 15

Do not install new belts on worn sheaves. If the sheaves
have grooves worn in them, they must be replaced
before new belts are installed.
The proper tension for operating a V-belt drive is the
lowest tension at which the belts will not slip at peak
load conditions. Belts are adjusted by swinging out the
motor pivot plate. For initial tensioning, the proper belt
deflection halfway between sheave centers is 1/64 inch
for each inch of belt
span. For example,
if the belt span is
64 inches, the belt
deflection should
be 1 inch using
moderate thumb
pressure at mid-
point of the drive.
Check belt
tension two times during the first 24 hours of
operation and periodically thereafter.
Motors
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease buildup on
the motor housing assists proper motor cooling. Never
wash-down motor with high pressure spray.
Greasing of motors is only intended when fittings are
provided. Motors supplied with grease fittings should
be greased in accordance with the manufacturer's
recommendations. When motor temperature does not
exceed 104ºF (40ºC), the grease should be replaced
after 2000 hours of running time.
NOTE
Motors for direct drive arrangement 4 models have
12 month lubrication intervals.
Fans have extended grease lines to lubricate the motor
without removal of any guarding.
Bearings (Arrangement 9)
The bearings for Vektor fans are carefully selected to
match the operating conditions of the specific class,
arrangement, and fan size. The instructions provided
in this manual and those provided by the bearing
manufacturer will minimize any bearing problems.
Bearings are the most critical moving part of the fan,
therefore, special care is required when mounting them
on the unit and maintaining them.
Refer to the following chart and the manufacturer's
instructions for grease types and intervals for various
operating conditions. Never mix greases made with
different bases. This will cause a breakdown of the
grease and possible failure of the bearing.
Failure to follow recommendations may result in
premature bearing failure and is not covered under
warranty.
®
Belt Span
Deflection =
64
Belt Span
Number
of shots**
* Lubrication interval is based on 12 hour day operation and
** Lubricant should be added with the shaft rotating and
• For conditions including high temperatures, moisture, dirt
• Lubricant should be a high quality lithium complex synthetic
• The use of non-synthetic lubricants will decrease lubrication
• Storage periods of three months or longer require monthly
Vektor-MS Nozzle Bearings
The bearings for the Vektor-MS nozzle assembly are
permanently lubricated and do not require additional
grease.
Recommended Bearing Lubrication Schedule
Relubrication Schedule in Months*
Synthetic Grease
Bearing Bore (inches)
Fan
1 ⁄ - 1 1 ⁄ - 1 5 ⁄ -
RPM
2 8 8
1 1 1 ⁄ 1 7 ⁄
2 8
To 250 12 12 12
500 12 12 12
750 12 12 12
1000 12 12 12
1250 12 12 12
1500 12 12 12
2000 12 10 8
2500 12 7 5
3000 12 5 3
3500 12 3 2
4000 12 2 .5
5000 12 1
4 8 8
maximum 160°F housing temperature. For 24 hour per day
operation, the interval should be cut in half.
until clean grease is seen purging from the bearing. The
lubrication interval may be modified based on the condition
of the purged grease. If bearing is not visible to observe
purged grease, lubricate with number of shots indicated for
bore size.
or excessive vibration, consult the factory for a specific
lubrication interval for your application.
grease conforming to NLGI Grade 2. Factory recommends
synthetic Mobilith SHC100.
intervals by approximately three times.
rotation of the shaft and purging grease prior to storage and
start-up.
Laboratory Exhaust Systems
1 15 ⁄ - 2 7 ⁄ 3 3 ⁄ - 3 15 ⁄ - 4
16 16 16 16
2 3 ⁄ - 3 3 1 ⁄ 4 1 ⁄
16 2 2
12 12 12 12
12 12 12 12
12 12 12 10
12 12 9 6
12 9 6 4
10 7 4 2
6 3 1.5 .5
4 1 .5
2 .5
.75
10 16 25 41
15 ⁄ -
16
5 1 ⁄
2
12
12
7
4
2
57
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