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 TM 55-1905-219-14-4
3-8. MARINE GEAR - MAINTENANCE INSTRUCTIONS (Cont).
(2) Oil Flow-Forward. The port in passage D is aligned with a drilled hole and channel X in the manifold. Therefore,
high pressure oil is supplied to channel X when a shift to forward is made. This oil flows through channel X to the area at
the clutch end of the forward clutch shaft. The 185-215 psi (1276-1482 k pa) oil then passes through the center-drilled and
crossed-drilled hole in the clutch shaft to the area between the clutch piston and the clutch cylinder through an angular
hole in the cylinder. This moves the piston forward to compress and engage the clutch plate stack. The area between the
reverse clutch piston and reverse clutch cylinder remains at atmospheric pressure as described in Neutral.
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