TM 55-1730-229-12
AG 320A-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Section XIV. MAINTENANCE OF LUBRICATION SYSTEM
(2) Place container under filter
cover to catch draining oil.
a. The engine lubrication system,
figure 4-60, is comprised of a rotary
(3) Remove oil pressure tap plug
oil pump assembly, an oil pressure reg-
(1) with packing (2) from filter cover
ulating valve, an oil filter element, an
(5) Discard packing (2).
oil distribution manifold, a pickup and
strainer, a sight level indicator, and
(4) Remove two bolts (3), washers
two magnetic drain plugs. Also associ-
(4), filter cover (5), with packings (6,
ated with the lubrication system are a
8), and oil filter element (7). Discard
low oil pressure switch, and a high oil
packings (6, 8) and oil filter element
temperature switch (covered in para-
(7).
graphs 4-41 and 4-42).
b.
Inspect.
b. The rotary oil pump assembly is
located in the oil pump housing on the
(1) Inspect oil filter element (7)
gearcase assembly.
The pump assembly
for metal particles and other foreign
receives oil from the oil sump through a
material which may indicate internal
suction tube connected to a pickup and
If metal particles are
engine damage.
strainer.
The pump supplies oil under
present, change oil and oil filter
pressure to the oil pressure regulating
element, and then operate engine for a
valve, which regulates the oil pressure
minimum of 15 minutes.
If oil filter
to 35 to 55 psig by bypassing some of
element is free of metal particles or
the oil back to the oil sump.
foreign material, engine is acceptable
for continued service.
c. Oil is routed to an oil distri-
bution manifold through a replaceable
(2) If metal particles or foreign
oil filter element.
The oil distribu-
material is present on oil filter ele-
tion manifold is mounted in the com-
ment after 15 minutes of operation,
pressor section and delivers oil to the
Notify
internal damage is indicated.
meshing points of the planetary gear
maintenance supervisor.
system.
Oil is routed through inter-
nal passages to provide lubrication at
(3) Inspect filter cover packing
the main shaft bearings, gear meshing
grooves for nicks, scratches, or burr-
points, and the starter clutch.
ing. No damage is allowed.
Oil
from the lubrication points flows back
into the oil sump to replenish the con-
c.
Install.
(See figure 4-61.)
stantly circulating oil supply.
(1) Install new oil filter element
(7), new packings (6, 8), and filter
OIL FILTER ELEMENT AND SEALS.
cover (5) into oil filter housing.
a. Remove.
(See figure 4-61.)
(2) Attach filter cover (5) with
two washers (4) and bolts (3). Tighten
(1) Cut and remove lockwire from
bolts to a torque value of 50 inch-
oil pressure tap plug (1).
pounds.
