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 TM 55-1905-220-14-4
3-8.
MARINE GEAR- MAINTENANCE INSTRUCTION (Cont.)
d.
Oil Flow.
(1)
Oil Flow-Neutral. Some of the 18-20 psi (124-140 kpa) oil in the oil return pipe cavity of the
selector valve body is metered through the orifice in the return pipe piston. This oil lubricates the forward and
reverse pinions, the forward and reverse pinion roller bearings, the clutch spider ball bearings and the reverse
and driving and driven gear ball bearings in all positions of the selector valve. The remainder of the 18-20 psi
(124-140 kpa) oil in the return pipe cavity is distributed by channel Z in the manifold which directs cooling oil to
the forward clutch through an orifice plug installed in the manifold. Branch channel Y in the manifold is
interconnected with channel Z and directs cooling oil to the reverse clutch through another orifice plug if located
in the-manifold. The pressurized oil which is metered through the orifice plugs is directed to an area between
the front face of the manifold and the rear face of the clutch cylinders. From this area the oil passes through
drilled holes in the hub of each cylinder- to the oil catcher area of each clutch shaft. Due to centrifugal force in
the oil catcher area, the oil passes out through drilled holes in the hub portion of each clutch shaft, through the
clutch plates, and returns to the sump. Cooling oil is supplied to the clutch plates in all positions of the selector
valve. A drilled port in passage D and a drilled port in passage E of the selector valve are aligned with similar
holes in the manifold. The port in passage D aligns with channel X in the manifold that extends to a chamber at
the clutch end of the forward clutch shaft. The port in passage E aligns with channel W in the manifold that
extends to a chamber at the clutch end of the reverse clutch shaft. A center-drilled hole and a cross-drilled
hole in each clutch shaft connects each chamber to an area between each clutch piston and cylinder through an
angular-drilled hole in the cylinder. Since passage D and passage E are at atmospheric pressure when in the
neutral position, then the area between each clutch piston and cylinder also is at atmospheric pressure.
3-288
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