OM-01510
D SERIES
MAINTENANCE & REPAIR
PAGE E - 13
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great
ly shorten bearing life.
Do not
spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail
ure.
Rotate the bearings by hand to check for rough
ness or binding and inspect the bearing balls. If ro
tation is rough or the bearing balls are discolored,
replace the bearings.
The bearing tolerances provide a tight press fit
onto the shafts and a snug slip fit into the gear
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).
