About Bearings
2-18
990 APEX Service Manual
About Bearings
This section describes the parts of the machine that require periodic lubrication, and specifies the
lubricants. In addition, it explains how to maintain the lubrication systems on the machine.
If the bearing is equipped with a grease fitting (Zerk Fitting).
The Zerk fitting is basically a valve that opens under pressure to allow lubricant to pass through a
channel and be forced into the voids of the bearing. When the pressure stops, the ball returns to its
closed position. The ball excludes dirt and functions as a check valve to prevent grease escaping
back out of the fitting.
The ball is almost flush with the surface of the fitting so that it can be wiped clean to reduce the
amount of debris carried with the grease into the bearing.
Note:
Bearings without grease fittings have been pre-lubricated at the factory and do
not require further lubrication.
Note:
Clean excess grease to avoid contact with feed belts, clamping areas, or the door.
FIGURE 2- 10.
Zerk Fitting
About Pillow Block Bearing Housings
A pillow block is any mounted bearing where the mounted shaft is in a parallel plane to the
mounting surface, and perpendicular to the center line of the mounting holes, as compared to dif
-
ferent types of flange blocks or flange units. The type of rolling element defines the type of pillow
block.
FIGURE 2- 11.
Pillow Block Bearings
Zerk Fitting
Hub Style
Closed Pillow Block
Opened Pillow Block
perpendicular mount
parallel
Summary of Contents for 990-APEX
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