Maintenance
36
The maintenance interval periods are stated, guidelines only.
Any large deviations in the pattern of usage may necessitate
further maintenance attention.
If the fan/motor assembly is going to be stored for 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 connection
is securely fixed. Check the function of all anti vibration
mounts.
Check for any obstructions or blockages of the air intakes and
discharges. Check the traps for leaks or blockages and prime
as necessary.
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 bearing are greased for life, but larger units with
standard bearings require annual lubrication. These have
grease nipple. 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)
Inspect periodically for excessive vibration or temperature.
Operating conditions will vary the frequency of inspection and
lubrication. Contact the motor manufacturer or Trane for
lubrication instruction. Most smaller frame motors come
without grease nipple where the bearings are permanently
sealed.
The motor with double shielded bearings are lubricated for life
and cannot be re-lubricated.
W.E motors up to 132 frame and TECO and Brook Hansen
motors up to 180 frame comes with sealed for life bearings,
while motor above this range, have open bearings with “flush
through” re-greasing facilities.
To re-lubricate the motor, complete the following:
1.
2.
3.
4.
5.
Standard condition: 8 hour operation per day with rated or
light loading in a clean and low vibration environment. Severe
condition: 24 hour operation per day with rated/light loading or
in a dirty/dusty environment or where the motor is subject to
vibration/light shock loading.
Grease Type: TECO/Brook Hansen motor – Use Esso Unirex
Lithium N3 grease.
W.E motor – Use Shell Alvania R3 grease.
IMPORTANT
During maintenance operation the unit must be
completely isolated and precautions taken to prevent
any premature restart.
IMPORTANT
Do not over lubricate bearings. Excessive pressure
caused by over lubrication can displace bearing grease
seals or cause grease to overheat the bearing, resulting
in premature bearing failure.
WARNING
DISCONNECT POWER SOURCE FOR MOTOR
LUBRICATION. FAILURE TO DO SO MAY RESULT IN
INJURY OR DEATH FROM ELECTRICAL SHOCK OR
MOVING PARTS.
Turn the motor off. Make sure it cannot accidentally
restart.
Remove the relief plug and clean out any hardened
grease.
Add fresh grease through the fitting with low pressure
grease gun.
Run the motor for few minutes to expel any excess grease
through the relief vent.
Stop the motor and replace the relief plug.
Motor Greasing Intervals
2. Fan
1. Fan Motors
3. Bearing Test
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