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 TM 55-1905-220-14-4
3-8. MARINE GEAR - MAINTENANCE INSTRUCTIONS (Cont).
(3) Oil Flow-Reverse. The port in passage E is aligned with a drilled hole and channel W in the manifold.
Therefore, high pressure oil is supplied to channel W when a shift to reverse is made. This oil flows through
channed W to the area at the clutch end of the reverse clutch shaft and around the flats of the oil pump drive
sleeve. The 185-215 psi (1276-1482 kpa) oil then passes through the center drilled and cross-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
forward clutch piston and cylinder remains at atmospheric pressure as described in Neutral.
3-292
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