WWW.BALTIMOREAIRCOIL.COM
14
• Refer to
Table 3 on Page 15
for normal operating oil capacity of each gear drive.
• Refer to
Table 4
or
5
on
Page 16
or the gear drive nameplate for specific gear model
number for each unit.
• Quarterly check to ensure proper alignment of all system components.
• Check to ensure that all bolts and external fasteners are tight.
• BAC recommends daily visual inspections and observation for oil leaks and unusual
noises and vibrations. If any of these occur, shutdown the unit until the cause is found
and corrected.
• If equipped with an external oil line and site gauge, check weekly to make sure the
breather hole at the top of the sight gauge is open.
Routine Maintenance During Operation
• Periodically recheck the alignment and tighten external fasteners as necessary. No
special break-in procedures are required.
• Excessive noise or vibration at initial operation is an indication of one or more of the
following:
–
Misalignment
–
Imbalance of the fan or other rotating parts
–
Improperly adjusted fan blades
–
Operation at the mechanical equipment resonant frequency
• For gears equipped with the low speed option, operate the fan motor at full speed for
at least five minutes weekly to supply oil to the upper bearing reservoir inside the gear
casing.
• During periods of inactivity, the lubricant does not constantly lubricate the internal
parts of the gear drive, leaving the gear drive susceptible to corrosion. Therefore, the
following special precautions are necessary during periods of inactivity:
–
For best results, let the gear drive cool for approximately 4 hours after shutdown.
–
Start the fan and let it run for approximately 5 minutes. This will coat the internal
parts of the drive with cool oil.
–
Thereafter, run the fan for 5 minutes once a week, throughout the shutdown period
to maintain the oil film on the internal parts of the gear drive.
• Clean the outside of the gear drive at least quarterly.
Prolonged Shutdown
Follow the procedures below when a gear drive will not be used for a prolonged period of
time, including seasonal shutdown.
• Drain all of the old oil from the gear drive and properly discard.
• Re-install drain plug.
• Remove the air breather from the gear drive.
• Completely fill the gear drive through the air breather port with a recommended
lubricant listed on
page 15
. Once the gear is filled, do not use the fan motor to rotate
the gear as pressure will build up in the gear box and cause damage.
• After completely filling the gear with oil, plug the previously removed air breather port,
and all remaining open ports. Use steel plugs to plug the openings, and store the air
breather so that you can reuse it when the gear drive is put back in operation.
• Securely attach a “warning” tag to the gear box and motor starter stating that it has
been “overfilled” to remind start-up personnel that they need to drain the gear oil back
to the proper level before using.
• To establish a moisture barrier, cover the drive with a tarpaulin or other protective cover.
• For start-up after prolonged shutdown, the gear box must be fully drained, then refilled
with new oil at or near the middle of the oil level sight gauge to prevent damage.
Re-install the air breather which was removed prior to the prolonged shutdown. Then,
follow the steps in “Initial Start-up” on
page 13
.
ATTENTION:
If noise or vibration
persists, shut the unit down and
correct the cause before continuing
operation.
ATTENTION:
When reversing the
direction of rotation, allow the fan
to come to a complete stop before
restarting the motor.
ATTENTION:
For installations with
2-speed motors when slowing
from high speed, allow a minimum
15-second time delay for the fan
to slow down before energizing the
low-speed winding.
ATTENTION:
Upon start-up, the
gear box must be drained back to
the proper level before operation
to prevent damage. The fan motor
should be locked and tagged out in
order to prevent operation until the
oil level is returned to normal.