WWW.BALTIMOREAIRCOIL.COM
13
Detailed Component
Maintenance
Procedures
Fan Drive System
BALTIDRIVE
®
Power Train/
BALTIGUARD™ and
BALTIGUARD PLUS™ Fan
System
Optional Gear Drive System
Optional Gear Drive System
Initial Start-Up
• If the unit is equipped with an extended lubrication line option or external sight glass,
make sure the ball valve located at the gear box is open prior to start-up.
• BAC ships all gear drives filled with oil. The initial oil level should be at or near the
middle of the oil level sight gauge.
• Internally mounted gear drives are factory installed, aligned, and tightened. Double
check all gear drive fasteners after the unit has been installed.
• On units with externally mounted motors, install and align the motor and drive shaft
in accordance with BAC’s installation instructions. Recheck the alignment and all
external fasteners after two weeks of operation.
• On installations with variable frequency drives, do not operate the standard gear drives
below 450 RPM motor speed (gear input speed). For speeds less than 450 RPM, a
low speed option gear drive must be supplied.
• Prior to the start-up, check all fittings on the gear drive to ensure that there are no
visible leaks. Refer to
Figure 5
for locations of the gear drive fittings.
Change Interval
•
Initial oil change
: Replace the original oil after 500 hours or four weeks of operation,
whichever comes first.
• After the initial oil change, change the oil every 2,500 hours or six months, whichever
comes first.
• Drain the oil at operating temperature through the drain plug.
• Refill the gear drive through the oil fill elbow with the recommended type and amount
of lubricant (
Table 3, page 15
). Refer to
Figure 5
for locations of these components.
Inspection & Maintenance
• Maintain the oil level at or near the middle of the oil level sight gauge. The oil level
should always be visible in the sight gauge window when the unit is not operating/
energized, and the oil is at ambient temperature.
• Check oil level weekly with the unit idle. On units supplied with an external sight
gauge, check the oil level of the external sight gauge and the sight gauge on the gear
drive to ensure that the proper amount of oil is in the gear drive.
• Add oil through the oil fill elbow if level is below the oil level sight gauge.
• The standard oil provided is mineral oil. Synthetic lubricants are also available as an
option (see Fan Drive System “Lubrication” on
Page 15
).
ATTENTION:
Gear drives should
not be used with Wye-Delta (Y-
)
motors.
Air Breather Plug
Oil Level
Sight Gauge
Oil Drain Plug
Oil Fill Elbow
Name Plate
Figure 5.
Gear Drive
NOTE:
Continued operation at a
speed which resonates with the
gear drive system may result in
torsional vibrations which can
damage system components. The
most common indicator of torsional
vibration is an unusual rumbling or
grinding noise from the gear drive
at a narrow speed range. The noise
will decrease to normal levels when
the speed is increased or decreased
away from the offending speed
range. This noise is not indicative
of a defect, but results when the
vibratory torque exceeds the drive
torque, causing the gear teeth to
separate and clash together very
rapidly. On variable frequency
applications, avoid operation near
this resonance speed by locking out
the resonance speed range.
