1.
Place blocks under the sub-base, near each spring holder, and position the sub-base level on the
blocks. A small gap (approx. 1.6 mm | 1/16") should exist between the flange of the vertical pipe
and the pump elbow with the gasket in place (see Figure:
Blocks placed under sub-base
).
2.
Install several flange bolts to help maintain alignment of the flanges.
Figure 10: Blocks placed under sub-base
WARNING:
Do not tighten bolts.
3.
Position the adjusting screw holders, while the adjusting screw end is seated in the hole, in the di-
rection of the horizontal thermal expansion. This will allow the required horizontal motion without
having the adjusting screw nut assembly hit the walls of the spring holder. Make sure there is suffi-
cient clearance between the adjusting screw holder and the bottom of the sub-base for vertical ther-
mal expansion, this clearance is usually shown on the pump installation drawing.
NOTICE:
Each spring carries a share of the unit load but generally do not carry equal loads. Each holder
has a small "window" to check the spring coil spacing, which is an indication of the relative load
on the spring. The installation drawing may indicate the approximate number of turns required
for each spring location, especially if the unit uses more than (4) springs. If necessary refer to
Table:
Spring rate information.
Table 3: Spring rate information
Spring Size
Wire Size
Spring Rate
Adjusting Screw
Size
Load Change per
Full Turn
1
.812"
1140 #/in.
1-1/2"-6 UNC
190 #
2
.750"
760 #/in.
1-1/2"-6 UNC
127 #
3
.532"
560 #/in.
1-1/2"-6 UNC
93 #
4
1.00"
1000 #/in.
2"-4-1/2 UNC
222 #
5
.375"
133 #/in.
¾"-10 UNC
13 #
4.
Turn the adjusting screws until the bottom of the sub-base just clears each block. Next adjust each
screw evenly until the pump flange and gasket are less than 0.8 mm | 1/32" away from the pipe
flange. Careful adjustment is necessary to keep the pump level and obtain better weight distribution
on the springs. After the springs have been loaded and adjusted, the base should be off the support
blocks and level.
4.1 Preinstallation
Model AF (42"/1200mm/54"/60"/66") LM/LMR Bearings Installation, Operation, and Maintenance Manual
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