Commissioning, Startup, Operation, and Shutdown
Model API 3171 Installation, Operation, and Maintenance Manual
32
threaded against the stem zerk fitting and the bottom of the wing nut rests on the cap of the
grease cup, then the grease reservoir is empty and you must refill it.
1. Zerk fitting
2. Wing nut
3. Grease reservoir
4. Throttling screw
Figure 15: Lubicate with grease cups
Fill the housing
1. Turn the wing nut clockwise until the center stem is raised all the way and the wing nut
does not turn any further.
2. Fit a pressurized grease gun to the top zerk fitting and pump the grease cup full until a
small amount of grease starts to come out of the side vent of the housing.
3. Unthread the wing nut in order to energize the grease cup. Allow the internal spring
pressure to push grease into the bearing lube line.
4. If the stem immediately recedes into the housing and the bearing has been purged, then
complete these steps:
a) Unthread the top lid in order to remove the top of the grease cup.
b) Inspect the plunger for defects.
If all the grease is found on the reverse (or back side) of the plunger, then it is defective and
must be replaced.
Adjust the flow (preferred method)
1. Unthread the wing nut completely against the zerk fitting of the center stem.
2. Unlock the hex nut of the throttling screw and turn the slotted screw clockwise
approximately one-half turn at a time.
3. Relock the hex nut and monitor the stem movement.
If the grease in the grease cup is completely consumed in 1 to 2 weeks of operation, then the
flow is correct and will maintain the proper amount of grease to the bearings.
Adjust the flow (alternate method)
This method provides a more precise amount of grease to the bearings independent of
changing operating temperatures and surrounding conditions. However, you must have a more
controlled maintenance schedule in order to make sure this is done on a regular basis.
1. Leave the throttling screw locked and open.
2. Back off the wing nut several turns for every 2 to 3 days of operation.
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