PROPELLE
Fig. 2. Top bearing should begin to emerge,
turn joint over and finally remove with
fingers as shown in Fig.
3.
If necessary tap bearing race from inside
with small diameter bar, as shown in Fig.
4,
taking care not to damage the bearing race.
This operation will destroy the oil seal and
necessitate fitting replacement parts when
reassembling, keep joint in this position
whilst removing bearing race, so as to avoid
dropping the needle rollers.
Repeat the operation described in previous
paragraph for opposite bearing. The
splined sleeve yoke can now be removed as
shown in Fig.
5.
Rest the two exposed trunnions on wood or
lead blocks, then tap flange yoke with soft
hammer to remove the two remaining
bearing races.
Fig.
5
Removing the
Yoke.
6.
TO
EXAMINE
AND
CHECK
FOR
WEAR
The parts most likely to show signs of wear
after long usage are the bearing races and
spider trunnions. Should looseness in the
fit
of these parts, load markings, or dis-
tortion be observed, they must be renewed
complete, as no oversize journal bearing
races are provided. It is essential that
bearing races are a light drive fit in the yoke.
In the rare event of wear having taken place
in the yoke cross hole, the holes will most
certainly be oval, and such yokes must be
replaced.
In the case of wear of the cross holes in a
fixed yoke, which is part of the tubular
shaft assembly, only in cases of absolute
emergency should this be replaced by
welding
in
a new yoke. The normal pro-
cedure is to replace by a complete shaft
assembly. The other parts likely to show
signs of wear are the splines of the sleeve
yoke, or splined stub shaft.
A
total of
.004"
circumferential movement, measured on the
outside diameter of the spline, should not
be exceeded.
In the event of the splined stub shaft re-
quiring renewal this must be dealt with in
the same way as the fixed yoke,
i.e.,
a
replacement tubular shaft assembly fitted.
7.
TO ASSEMBLE
See that the trunnion assemblies are well
lubricated with one of the oils recom-
mended. Assemble needle rollers in bearing
recess, smearing the walls of the races with
vaseline, or lubricant, to retain the rollers
in place.
It is advisable to replace cork gaskets and
gasket retainers (oil seals) on the trunnions
using a tubular drift as shown in Fig.
6.
The
spider journal shoulders should be shel-
lacked prior to fitting retainers to ensure
a
good oil seal. Ensure that the trunnions are
clean and free from shellac before fitting
needle rollers.
Fig.
6
Fitting
New
Oil
Seals.
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