The following is a brief description of the spring pocket components and their function (see Figure:
Spring pocket components
). The adjusting screw is used to compress or relax the spring. Turning the
screw causes the adjusting screw nut assembly to move vertically and change the amount of force the
spring exerts against the spring retainer, which is fastened to the sub-base. The stop nut is to limit the
vertical up motion of the sub-base in case part of the load is removed from the pump unit when the sys-
tem is cold. The jam nut keeps the stop nut from turning during normal operation when the sub-base has
been pushed down from the thermal expansion. The adjusting screw holder is a bearing surface for the
end of the adjusting screw and serves to hold the end of the screw in a fixed location.
1
2
3
4
5
6
7
8
9
10
1.
Adjusting screw
6.
Spring
2.
Jam nut
7.
Spring holder (welded to sub-base)
3.
Stop nut
8.
Adjusting screw nut assembly
4.
Spring retainer
9.
Lubricate with oil
5.
Bolts and nuts
10. Adjusting screw holder
Figure 9: Spring pocket components
The adjusting screw was lubricated at the factory but should be re-lubricated with heavy protective
grease during the pump installation. The springs and other parts should be coated with an agent to pro-
tect the surface from corrosion, and a heavy lubricant should be applied to the adjusting screw holder
pocket.
The following steps are used to set the springs and level the sub-base:
4.1 Preinstallation
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Model AF (42"/1200mm/54"/60"/66") LM/LMR Bearings Installation, Operation, and Maintenance Manual