r men take a long-handled wrench and turn up the
step-screw until the man inside the base can push the horseshoe shim
between the shoulder on the shaft and the guide-bearing casing. The men
on the wrench then back off and the horseshoe shim supports the weight
of the machine. When the shim is in place, or the jacking ring set up,
whichever the case may be, the cover-plate bolts may be taken out, the
nuts on the long screws holding the cover in place.

The 3/4-inch pipe which passes up through the step-screw is taken down
and, by means of the nuts on the long screws, the cover-plate is lowered
about 2 inches. Then through the hole in the step-screw a 3/4-inch rod
with threads on both ends is passed and screwed into the top step; then
the cover-plate is blocked so it cannot rise and, with a nut on the
lower end of the 3/4-inch rod, the top step is pulled down as far as it
will come. The cover-plate is let down by means of the two nuts, and the
top step-block follows. When it is lowered to a convenient hight it can
be examined, and the lower end of the shaft and guide-bearing will be
exposed to view.

[Illustration: FIG. 6]

The lower guide-bearing (Fig. 6) is simply a sleeve flanged at one end,
babbitted on the inside, and slightly tapered on the outside where it
fits into the base. The flange is held securely in the base by eight
3/4-inch cap-screws. Between the cap-screw holes are eight holes tapped
to 3/4-inch, and when it is desired to take the bearing down the
cap-screws are taken out of the base and screwed into the threaded holes
and used as jacks to force the guide-bearing downward. Some provision
should be made to prevent the bearing from coming down "on the run," for
being a taper fit it has only to be moved about one-half inch to be
free. Two bolts, about 8 inches long, screwed into the holes that the
cap-screws are taken from, answer nicely, as a drop that distance will
not do any harm, and the bearing can be lowered by hand, although it
weighs about 200 pounds.

The lower end of the shaft is covered by a removable bushing which is
easily inspected after the guide-bearing has been taken down. If it is
necessary to take off this bushing it is easily done by screwing four
5/8-inch bolts, each about 2 feet long, into the tapped holes in the
lower end of the bushing, and then pulling it off with a jack. (See Fig.
7.)

Each pipe that enters the passage in the foundation should be connected
by two unions, one