18
6. Maintenance
The maintenance interval periods are
stated, guidelines only. Any large
deviations in the pattern of usage may
necessitate further maintenance
attention.
During maintenance operations the
unit must be completely isolated and
precautions taken to prevent any
premature restart.
6.1 Fan
If the fan/motor assembly is going to be
stored for over two weeks before use, the
fan should be rotated by hand at weekly
intervals to avoid bearing damage.
If storage will be over one month it is
recommended that the belts be
slackened as well.
Check for soiling, damage, corrosion, and
any tendency to bind. Clean as
necessary.
Check that the flexible connections are
securely fixed.
Check the function of all antivibration
mounts.
Check for any obstructions or blockages
of all the air intakes and discharges.
Check the traps for leaks or blockages
and prime as necessary.
6.2 Bearing Test
Check that the fan bearing is tightened
and is not unduly noisy, by sounding it
using a metal bar as a conductor.
Where a belt guard has been supplied,
check that it is fitted correctly.
If there is any irregular noise or knocking,
renew both bearings. Fan bearings are
greased for life, but larger units with
standard bearings require annual
lubrication. These have grease line
extensions. In the case of extreme
running conditions, lubricate in
accordance with the following
recommendations:
Recommended lubricants;
ALVANIA
GREASE 3
(SHELL)
MOBILUX 3
(MOBIL)
BEACON 3
(ESSO)
SKF 28
(BALL BEARING
GREASE)
Do not overlubricate bearings.
Excessive pressure caused by
overlubrication can displace bearing
grease seals or cause grease to
overheat the bearing, resulting in
premature bearing failure.
6.3 Motor
Check the state of cleanliness of the
motor and clean it if necessary. Check the
noise level of the motor bearing by
listening to it with a metal conductor. If
there is any irregularity or undue noise,
the bearing should be changed or the
motor replaced.
6.4 Belt Drive
Belts that are split or have frayed edges
or any other signs of damage must be
replaced. Rubber shred on the fan
section floor is a sign of abnormal wear.
6.5 Belt Drive Tensioning
Tensioning of the drive belt is achieved by
moving the motor in relation to the fan
(see Figure 19).
The motor is moved on slide rails.
Figure 19
Figure Notes:
1. Slide rails
2. Lock nut
3. Tensioning screw
4. Tensioning pad
Loosening the
motor retaining bolt
and
then turning the tensioning screw carries
out the adjustment. It is important to
maintain the precise alignment of the
pulleys.
This should be checked with a straight
edge following each adjustment.
Following completion of the adjustment,
retighten the
motor retaining bolts
.
The belt tension should be checked by
using a proprietary instrument such as
the Browning belt-tension checker.
The belt drive must be retensioned
after the first 10 hours of operation.
The high performance of Fenner
Precision Built belts requires correct
tension; we recommend using the Fenner
Belt Tension Indicator.
IMPORTANT
IMPORTANT
CLCH-SVX05A-GB
