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 TM 55-1905-219-14-4
3-8.
MARINE GEAR - MAINTENANCE INSTRUCTIONS (Cont).
d.
Oil Flow.
(1) Oil Flow-Neutral. Some of the 18-20 psi (124-140 k pa) 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 k pa) 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.
3-294
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