components.
(c) Steam. Place parts in a perforated
d. TM 9-208-1. For complete information in regard
metal basket and steam-treat until clean. This method
to cleaning of Ordnance material, refer to TM 9-208-1.
is less efficient than the vapor-degreaser method and
may require additional cleaning of parts to remove all
4-23. Inspection and Repair.
traces of grease or oil, particularly from the recessed
a. Inspection and Repair of Cast Parts and
areas.
Machined Surfaces.
(2) Cleaning during repair and rebuild.
(1) Inspect cast parts for cracks or fractures,
(a) Remove dirt and other foreign matter
and inspect interiors for scores and burs.
from all metal surfaces This can be done by the dip-tank
(2) Inspect machined surfaces for cracks,
method or vapor-degreaser method, or by cleaning with
fractures, and signs of galling, pitting, scoring, or
cloths soaked in dry-cleaning solvents or mineral spirits
corrosion.
paint thinner. In the dip-tank method, agitation for
(3) Remove minor scores and burs from
approximately 1 minute in each tank is sufficient; in the
machined surfaces and interiors of case parts with a fine
vapor-degreaser method, treatment for about 2 to 3
stone or crocus cloth that has been dipped in dry-
minutes is sufficient.
cleaning solvent or mineral spirits paint thinner.
(b) Foreign matter is more easily
Replace part if it is cracked, fractured or excessively
removed from recessed areas when the proper tools are
scored or burred.
used. A stiff bristled brush or a pointed wooden stick
b. Inspection and Repair of Bearings.
will serve well in this instance.
(1) Inspect all bearings in accordance with TM
(3) Cleaning after shop inspection. After shop
9-214.
inspections, dip part in a tank containing fingerprint-
(2) Inspect ball for cracks, fractures, signs of
removing oil (type A), remove (use rubber gloves), and
pitting, or corrosion. Take several measurements of the
dry thoroughly with dry compressed air provided with
diameter of each ball to check for roundness and proper
moisture filter traps) or by wiping with clean, lint-free,
diameter.
dry cloths. Apply preservative as soon as possible after
(3) Perform
maintenance
functions
on
cleaning.
bearings as prescribed in TM 9-214.
b. Bearing Remove surface dirt, oil, or grease from
(4) Replace balls if they are damaged in any
any ball or needle bearing by one of the above methods,
way.
then place the bearings in hot oil (about 140'F) to
c. Inspection and Repair of Bushing-Type
loosen congealed oil or grease from the recessed areas.
Bearings.
Dip and agitate the bearing in clean dry-cleaning solvent
(1) Inspect bearing for cracks, fractures, signs
or mineral spirits paint thinner. Dry bearing thoroughly
of galling, pitting, scoring, and corrosion.
and coat it with a thin film of lubricant and wrap it tightly
in oiled or waxed paper until ready for inspection or
Note. Inspection is to be accomplished without
assembly.
removing the bearing. Use a small mirror and pen-
Caution:
Do not spin a bearing with
type flashlight where necessary.
compressed air. Refer to TM 9-214 for the care and
maintenance of bearings.
(2) Replace bearing if damaged in any way.
c. Hydraulic Parts.
Observe the procedures
Caution: Note the position of the defective
discussed in a. above. After assembly and before
bearing within its housing so that the now bearing
inspection, wash all hydraulic components thoroughly in
may be installed in the same manner.
dry-cleaning solvent or mineral spirits paint thinner. Dry
d. Inspection and Replacement of "O" Rings.
the parts, except ball and roller bearings, with dry
(1) Inspection. Rubber "0" rings are generally
compressed air. Bearings, pistons, and other parts
replaced when removed from their sealing surfaces.
having sliding fits or close-running surfaces should be
(2) Replacement.
To facilitate installation,
coated with OE-10 oil before assembly. Cleanliness
apply a film of grease to "O" rings that are used for
plus care in handling or working parts, will reduce
sealing or waterproofing housings, clutches, pumps, etc.
malfunctioning and increase the life of hydraulic
4-6
