Specifications
1051
GENERAL FITTING INSTRUCTIONS
INSPECTION
-
GENERAL
9.
When fitting bearing to shaft, apply force only to
inner ring of bearing, and only to outer ring when
fitting into housing.
1.
Never inspect a component for wear or
dimensional check unless
it
is absolutely clean; a
slight smear of grease can conceal an incipient
failure.
2.
When a component is to be checked dimensionally
against figures quoted for it, use correct equipment
(surface plates, micrometers, dial gauges, etc.) in
serviceable condition. Makeshift checking
equipment can be dangerous.
3.
Reject a component if its dimensions are outside
limits quoted, or
if
damage is apparent. A part
may, however, be refitted if its critical dimension is
exactIy limit size, and is otherwise satisfactory.
4.
Use ‘Plastigauge’
12
Type PG
-
1 for checking
bearing surface clearances; directions for its use,
and a scale giving bearing clearances in
0,0025
mm
(0.0001
in) steps are provided with it.
BA
L
L
AND
ROLLER
BEARINGS
NEVER REPLACE
A
BALL OR ROLLER
BEARING WITHOUT FIRST ENSURING THAT
1.
Remove all traces
of
lubricant from bearing under
inspection by washing in petrol
or
a suitable
degreaser; maintain absolute cleanliness
throughout operations.
2.
Inspect visually for markings
of
any form
on
rolling
elements, raceways, outer surface
of
outer rings or
inner surface
of
inner rings. Reject any bearings
found to be marked, since any marking in these
areas indicates onset of wear.
3.
Holding inner race between finger and thumb
of
one hand, spin outer race and check that it revolves
absolutely smoothly. Repeat, holding outer race
and spinning inner race.
4.
Rotate outer ring gently with a reciprocating
motion, while holding inner ring;
feel
for any check
or obstruction
to
rotation, and reject bearing
if
action is not perfectly smooth.
5.
Lubricate bearing generously with lubricant
appropriate to installation.
6.
Inspect shaft and bearing housing for
discolouration or other marking suggesting that
movement has taken place between bearing and
seatings. (This is particularly to be expected
if
related markings were found in operation
2.)
If
markings are found, use ‘Loctite’ in installation
of
replacement bearing.
7.
Ensure that shaft and housing are clean and free
from burrs before fitting bearing.
8.
If one bearing
of
a pair shows an imperfection
it
is
generally advisable to renew both bearings: an
exception could be made
if
the
faulty bearing had
covered a low mileage, and
it
could be established
that damage was confined to it only.
IT
IS IN AS
-
NEW CONDITION.
ST1042M
‘\U
10.
In the case of grease
-
lubricated bearings (e.g. hub
bearings)
fill
space between bearing and outer seal
with recommended grade
of
grease before fitting
I
11.
Always mark components
of
separable bearings
+--*
(e.g. taper roller bearings) in dismantling, to
ensure correct reassembly. Never fit new rollers
in
a used cup.
-_
seal.
fa
OIL
SEALS
1.
Always fit new oil seals when rebuilding an
assembly. It is not physically possible to replace a
seal exactly when it has bedded down.
2.
Carefully examine seal before fitting to ensure that
it is clean and undamaged.
3.
Smear sealing lips with clean grease; pack dust
excluder seals with grease, and heavily grease
duplex seals
in
cavity between sealing lips.
4.
Ensure that seal spring, if provided, is correctly
fitted.
5.
Place lip
of
seal towards fluid to be sealed and slide
into position
on
shaft, using fitting sleeve when
possible to protect sealing lip from damage by
sharp corners, threads or splines. If fitting sleeve is
not available, use plastic tube
or
adhesive tape to
prevent damage
to
sealing lip.
&*:
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ST
1
038
M
WLJ
2