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TM 55-1905-221-14-4
6-39. REVERSE GEAR ASSEMBLY (Continued).
(3) Reverse Drive
As shown below, when the engine is running, reverse drive to the shaft (6) is accomplished by moving the
selector control valve lever to the reverse position which admits oil under pressure from the pump to the oil passage (C)
in the reverse gear housing (19) and to the cavity aft of the piston (12). When oil pressure is applied to this piston, it
moves forward to lock the clutch plate (10) between the piston and the stationary drive plate (11) and, since the clutch
plate is splined to the ring gear (9), the ring gear is held stationary.
Shifting from forward to reverse drive through neutral may be made at any speed; however, it is advisable to
shift at low engine speeds. For longest clutch life, reduce the engine speed to idle, make the shift and then increase the
engine speed.
The landing craft has a locking (brake) device to prevent the propeller shaft from rotating when not under direct
propulsion. The forward motion of the vessel causes the propeller shaft to rotate. Thus, with the marine oil pump not
operating, lubricating oil is not circulated through the marine gear. Therefore, overheating and damage to the marine
gear is possible unless the rotation of the propeller shaft is prevented.
Oil Flow Diagram for Application of Reverse Clutch Including Power Flow Legend
Passage-Forward Oil
Passage-Neutral Oil
Passage-Reverse Oil
Shaft-Reverse Gear Drive
Gear-Reverse Ring
Plate-Reverse Clutch
Plate-Reverse Clutch Drive
Piston-Reverse Clutch
Housing-Reverse Gear


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