RUTHMAN Gusher Pumps 7071 Series, Инструкция по эксплуатации, Страница: 37 / 39

37
APPENDIX 4 - BEARING INSTALLATION
1. Begin by cleaning your work area, contami-
nants can cause bearing failures as fast as
any other reason.
2. The mounting force should be applied
against the ring, and only the ring, which is
being press-fitted. A bearing should never be
forced onto a shaft by pressure or hammer
blows applied to the outer ring, nor should
the bearing be press-fitted into a housing by
force applied to the inner ring.
3. Using an arbor press, the bearing may be
laid on a face block which contacts only the
bearing inner ring and which has a hole diam-
eter greater than the bearing bore, as shown
in Fig. A. The shaft is pressed through the
bearing until it is seated firmly against the
shaft shoulder.
4. If the shaft is not too long, it can be sup-
ported beneath the table of the arbor press
and the bearing pressed onto it by ram pres-
sure against a piece of soft metal tubing, as
shown in Fig. B. The tubing must be clean,
inside and out, and the inside diameter of
the tubing should be slightly greater than the
bearing bore. The ends of the tubing should
be square (with corners chamfered to avoid
flaking) and should contact only the bearing
inner ring. The shaft must be held in line with
the ram of the arbor press to avoid cocking
the bearing on the shaft seat.
5. When an arbor press is not available, the
bearing can be driven onto the shaft seat
by light hammer blows against the end of
the soft metal tubing. These blows should
be made alternately against opposite sides
of the tubing face, and great care must be
taken to avoid cocking the bearing as it is
driven onto the shaft seat.
6. When a bearing is installed into a housing it
is normally a slip fit, however if force is nec-
essary to install bearing, the force should be
exerted on the outer ring of the bearing as
shown in Fig. C. Again the force must be ap-
plied evenly so as not to cock the bearing in
the bore.