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 TM 55-1905-220-14-1
1-43. MARINE GEAR.
a. The Model MG-514 Marine Gear is a marine forward and reverse reduction gear in a 4.5:1 ratio. The Marine Gear
may be operated continuously in either the forward or reverse position.
b. Identical gear ratios in forward and reverse permit the marine gear to be converted from a right rotation to a left
rotation by changing the oil pump. On one engine, the forward gear is run in reverse, obtaining opposite rotation of the
c. The marine gear is completely hydraulic in all phases. All bearings are oil lubricated. Both clutches are engaged by
high pressure oil, and both clutches are cooled and lubricated by low pressure oil. A mechanical lock-up, or come-home,
feature is provided for clutch engagement in case emergency operations are necessary.
d. The forward clutch shaft and the reverse driving gear always rotate in engine direction. Refer to Figure 1-35. The
reverse clutch shaft and the reverse driven gear always rotate in anti-engine direction. When the forward clutch is
engaged, the counter shaft gear will rotate in an anti-engine direction due to the gear meshing with the forward pinion.
When the reverse clutch is engaged, the counter shaft gear will rotate in an engine direction due to the gear meshing
with the reverse pinion.
Figure 1-35. Marine Gear Power Flow
1-70
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