0 SERIES
OM−01155
MAINTENANCE & REPAIR
PAGE E − 12
housing. Replace the bearings, shaft, or gearbox
housing if the proper bearing fit is not achieved.
If the bearings require replacement, use a suitable
puller to remove them from the shafts.
GEARBOX REASSEMBLY
(Figures 2 and 5)
Clean and inspect the bearings as indicated in
GEARBOX DISASSEMBLY
.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected
in place
. It is
strongly
recommended that the bearings
be replaced
any
time the shaft and and
bearings are removed.
The pinion shaft bearings (2 and 12) may be
heated to ease installation.
Do not
heat the drive
shaft bearings (14 and 28).
NOTE
In the following steps, install the pinion shaft bear-
ings (2 and 12) with the loading grooves on both
bearings facing toward the shaft shoulders.
An induction heater, hot oil bath, electric oven, or
hot plate may be used to heat the bearings. Bear-
ings should
never
be heated with a direct flame or
directly on a hot plate.
NOTE
If a hot oil bath is used to heat the bearings, both the
oil and the container must be
absolutely
clean. If
the oil has been previously used, it must be
thor-
oughly
filtered.
Heat the bearings to a uniform temperature
no
higher than
250
_
F (120
_
C), and slide the bearings
onto the shaft, one at a time, until they are fully
seated. This should be done quickly, in one con-
tinuous motion, to prevent the bearings from cool-
ing and sticking on the shaft.
Use caution when handling hot bear-
ings to prevent burns.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
out of position in shrinking. If movement has oc-
curred, use a suitably sized sleeve and a press to
reposition the bearings.
If heating the bearings is not practical, use a suit-
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
When installing the bearings onto the
shafts,
never
press or hit against the outer
race, balls, or ball cage. Press
only
on the
inner race.
Slide the assembled pinion shaft and bearings into
the gearbox housing so that the bearing (2) proj-
ects no more than .200 inch (5,08 mm) maximum
from the gearbox housing, and the bearing (12)
projects no more than .015 inch (0,38 mm).
These
dimensions are critical
to prevent bearing pre-
load and to assure proper component alignment
when the pump is completely reassembled. If the
installation dimensions do not match those shown
above, check the mounting of the bearings on the
shaft to ensure proper positioning.
Lay the gearbox housing on the bed of an arbor (or
hydraulic) press with the drive side facing up. Lu-
bricate the inboard bearing (28) and use a suitably
sized sleeve to press it into the housing until fully
seated.
When installing the shaft and bearing into
the bearing bore, push against the outer
race.
never
hit the balls or ball cage.
After installing the inboard bearing, support the in-
ner race with a suitable jig or fixture. See Figure 5
for fixture dimensions, drive gear and shaft installa-
tion.
