10
GBD Lubrication & Maintenance
Prelubricated Bearings
All bearing units are prelubricated with grease chosen
for its chemical and mechanical stability.
Units furnished with a grease fitting should be
periodically relubricated. The relubrication interval
depends on bearing operating conditions including
speed, temperature and environment:
The fan bearings are supplied with premium lithium
complex NLGI #2 bearing grease.
Mixing different kinds of grease can greatly affect the
viscosity, dropping point and penetration properties of
the lubricant. Water and heat-resisting properties and
mechanical stability are lowered. It is essential that the
thickener (soap base), NLGI penetration grade and the
base oil be of the same group. See the chart below for
the mixing properties of grease.
Maintenance Procedures
The exhaust blower should be inspected every three
months as follows:
1. Check the blower wheel; it lifts out of the scroll on
GBD models. If grease laden, clean to insure quiet
and efficient operation.
2. Check belt tension and wear; replace belts if wear is
excessive.
3. Motors are equipped with prelubricated ball bearings,
and will require no lubrication for normal operation.
4. Exhaust blower wheel ball bearings are equipped with
grease fittings. Grease per instructions on left.
Relubrication Procedure
1. Add grease slowly with shaft rotating until a slight bead
forms at the seals.
2. Relubrication is generally accompanied by a slight rise
in operating temperature until the bearing chamber is
stabilized with the proper amount of grease.
3. If necessary to relubricate while bearing is stationary,
refer to bearing manufacturer’s specifications for
maximum grease capacity for size of bearing.
4. For abnormal operating conditions of high temperature
or abnormal environments, consult the factory.
Speed
(RPM)
Temperature
(°F)
Type of
Enviroment
Greasing
Interval
to 500 up to 120°F clean 6 months
to 1000 up to 150°F clean 6 months
to 1500 up to 210°F clean 5 months
to 2000 over 210°F clean 4 months
any up to 150°F dirty 5 months
any over 150°F dirty 4 months
any any extreme 3 months
Mixing Properties of Grease
SOAP BASE CALCIUM SODIUM ALUMINUM BARIUM LITHIUM
CALCIUM
+• • x•
SODIUM
•+ • xx
ALUMINUM
•• + xx
BARIUM
xx x +x
LITHIUM
•x x x+
+
Mixing will not produce appreciable changes of properties.
•
Mixing may produce considerable changes of properties.
X
Mixing will cause a drastic change of properties.
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