TM 5-3810-307-24-1-1
The life of an antifriction bearing will be shortened if
Sleeve Bearings.
not properly lubricated. Dirt in an antifriction bearing
can cause the bearing to lock resulting in the shaft
Do not install sleeve bearings with a hammer. Use a
turning in the inner race or the outer race turning
press and be sure to apply the pressure directly in
within the cage.
line with the bore. If it is necessary to drive on a
bearing, use a bearing driver or a bar with a smooth
Double Row, Tapered Roller.
flat end. If a sleeve bearing has an oil hole, align it
with the oil hole in the mating part.
Double row, tapered roller bearings are precision fit
during manufacture and components are not
GASKETS.
interchangeable. The cups, cones, and spacers are
usually etched with the same serial number and letter
Be sure the holes in the gaskets correspond with the
designator. If no letter designator are found, wire the
lubricant passages in the mating parts. If it is
components together to assure correct installation.
necessary to make gaskets, select material of the
Reusable bearing components should be installed in
proper type and thickness. Be sure to cut holes in
their original positions.
the right places. Blank gaskets can cause serious
damage.
Heating Bearings.
When removed, always install new cylinder head and
Bearings which require expansion for installation
manifold gaskets using recommended gasket
should be heated in oil not to exceed 250 degrees F
compound on head gaskets to allow uniform sealing.
(121 degrees C). When more than one part is heated
to aid in assembly, they must be allowed to cool and
BATTERIES.
then pressed together again. Parts often separate as
they cool and contract.
Clean batteries by scrubbing them with a solution of
baking soda and water. Rinse with clear water. After
Installation.
cleaning, dry thoroughly and coat terminals and
connections with anticorrosion compound or grease.
Lubricate new or used bearings before installation.
Bearings that are to be preloaded must have a film
If the machine is to be stored or not used for an
ofoil over the entire assembly to obtain accurate
extended period of time, the batteries should be
preloading. When installing a bearing, spacer, or
removed. Store the batteries in a warm, dry place,
washer against a shoulder on a shaft, be sure the
preferably on wooden shelves. Never store on
chamfered side is toward the shoulder.
concrete. A small charge should be introduced
periodically to keep the specific gravity rating at
When pressing bearings into a retainer or bore,
recommended level.
uniformly apply pressure to the outer race. If the
bearing is pressed on the shaft, uniformly apply
HYDRAULIC SYSTEMS.
pressure on the inner race.
WARNING
Preload.
Exercise extreme care around press-
Preload is an initial load placed on the bearing at the
urized hydraulic systems. Do not work
time of assembly. Whether a tapered roller bearing
on a hydraulic system while it is in
should have preload could depend on any of several
operation or until all pressure is
conditions: rigidity of the housings and shaft, bearing
released.
spread, speed of operation, etc.
Cleanliness.
To determine whether a bearing requires preload or
end clearance, consult the disassembly and
Contaminants in a hydraulic system affect operation
assembly instructions pertaining to that bearing.
and will result in serious damage to the system
components. Dirty hydraulic systems are a major
Care should be exercised in applying preload.
cause of component failures.
Misapplication of preload to bearings requiring end
clearance can result in bearing failure.
