to equipment, never use gasoline
or other petroleum-base
hydraulic system parts.
hydraulic system parts, use drycleaning
and dry parts thoroughly to make sure no residue
If a coating
preservative is required before assembly, apply a light film of preservative oil. If
petroleum-free solvents are not available, use the same hydraulic fluid as used in the
Sealing Surfaces. Inspect all surfaces in contact with gaskets, packings,
are no nicks, burrs, or scratches.
If any defect
it as outlined
Instructions in this manual.
for rusted or pitted balls, races, or separators.
races for brinnelling,
and serious discoloration.
Refer to TM 9-214
instructions for bearings.
Following are causes for bearing rejection:
Cuts or grooves
to ball or roller rotation.
pits (not minor machine marks or scratches).
consists of checking for defects
such as distortion, wear,
pitting. Parts under
load or pressure must be inspected
Drain Plugs. When
drain plugs from transmission,
components, inspect sediment adhering to plug. A buildup of grit and/or
fine metal particles
A few fine particles are normal. This inspection
determining defective parts prior to internal inspection of parts.
Gears. Gear inspection cannot be described in detail
here; there are too many differences
size and shape
The following steps can be used to make a general
inspection of all gears.
Follow all steps listed in General
for final inspection.
Loss of metal from the surface of gear
gears from meshing
or performing properly.
Initial Pitting. This may occur when a pair of gears is
continue until most high spots have been reduced,
This pitting is not necessarily serious.
must not prevent
long as contact
Destructive Pitting. This type of pitting occurs after initial pitting, often
at an increasing
rate. This will destroy contact area and reduce the gears ability to carry a load. Rapid
will occur with use.
is caused by the fine particles that may come from many
from gear teeth or bearings,
sand or scale from castings,
or other impurities
in oil or air.