Gorman-Rupp Pumps 4D-X3 1P - Manual (Page 29)

OM--01515 D SERIES
MAINTENANCE & REPAIR PAGE E -- 13
housing. Replace the bearings, shafts, eccentric
housing, or gear housing if the proper bearing fit is
not achieved.
If the bearings require replacement, remove the
bearing retaining ring (34). Remove the bearing
snap ring (32) and use a bearing puller to remove
the bearings (2, 23 and 33).
Gearbox Reassembly And Installation
(Figure 4)
Inspect the shafts (18, 28 and 35) for distortion,
nicks or scratches. Dress small nicks and burrs
with a fine file or emery cloth. Replace the shafts if
defective.
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 bearings may be heated to ease installation.
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 shafts, 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.
NOTE
The crankshaft bearing (9) must be installed after
the crankshaft gear (3).
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 suitable sized sleeve and a press to
reposition the bearings.
If heating the bearings is not practical, use a suit-
able sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
When installing the bearings onto the
shaft, never press or hit against the outer
race, balls, or ball cage. Press only on the
inner race.
Secure the bearing (2) with the snap ring (34). Se-
cure the crankshaft roller bearing (33) with the
snap ring (32).
If removed, press the pinion shaft bushing (30) into
the gear housing until fully seated.
Use a hydraulic press to install the pinion gear (27)
onto the pinion shaft (28).
NOTE
The pinion gear is a tight interference fit on the pin-
ion shaft. To ease installation, the gear may be
heated (and the shaft cooled) to a temperature dif-
ferential of 350_F (177_C). If the gear is heated,
use
caution when handling the gear to prevent burns.
Slide the assembled pinion shaft and gear into the
pinion shaft bushing until fully seated.
Slide the crankshaft and assembled bearing (2)
into the gear housing and secure with the snap ring
(36).