TM 9-4940-549-14&P
(7)
Wash the oil reservoir portion of the frame, being sure that
accumulations of oil and sludge are removed. Clean gasket sur-
faces for cylinders and end covers. Be sure no particles of old
gaskets remain on the surfaces.
Clean the air valves in solvent, Clean both valve and seat by
(8)
brushing with a stiff bristle (not wire) brush. Should it be
necessary to scrape carbon or sludge, do so lightly, with some-
thing soft, like a square edge piece of hardwood. This will
prevent marring of valve or seating surface.
Clean thoroughly, then inspect bearings for signs of wear, or
(9)
roughness. If bearings are worn, rough, or have other dam-
age, replace the crankshaft assembly.
Reassembly. Position the compressor frame (crankcase) on work-
d.
bench. Fasten it down so it will not tip over when weight is added
by assembly.
NOTE
Install new gaskets in all positions
at reassembly, and a new oil seal in
the shaft end cover.
NOTE
Refer to figure 14-10 for steps (1)
through (3).
(1) Install the crankshaft, complete (1, figure 14-10 ) from frame
end as follows:
Remove the retaining ring from groove at outer end bear-
(a)
ing (near threaded end of shaft) then insert shaft into the
frame.
Guide threaded end through housing
until bearings reach
(b)
their position, then tap gently with
a soft hammer on the
journal end of shaft until the empty
retaining ring groove
extends approximately 1/16-inch out
of housing.
(c)
Insert retaining ring in its groove, then tap the threaded
end of shaft gently with a soft hammer, until the retaining
ring is tight against the housing.
Install oil seal with the sealing lip
facing inside of the shaft end cover,
then press into position. If a vise
is used to press the seal, be sure ser-
rated jaws, if any, are covered to pro-
tect seal from distortion.
(2) Install the shaft end oil seal (16) in cover (14).
14-17
