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 TM 55-1905-219-14-4
3-8. MARINE GEAR - MAINTENANCE INSTRUCTIONS (Cont).
(2) Metal piston rings, which function as oil seals, are used in the clutches. The metal rings prove superior
to other types of seals normally used in marine gear clutches. All oil that passes through the hydraulic system is subjected
to two full-flow type filters. The oil return pipe assembly regulates the low pressure oil supply and also distributes oil for
lubrication purposes. A heat exchanger is installed in the hydraulic system to maintain the oil within the marine gear at the
recommended temperature.
(3) External Oil Circuit. Oil is drawn from the sump through the oil strainer to the oil pump assembly. From
the oil pump assembly, the oil is conveyed by a flexible hose to the oil filter. The filtered oil is routed from the filter to a
remote-mounted heat exchanger. The cooled oil from the heat exchanger is routed to a reduction "tee" fitting on the
selector valve. The "tee" fitting on the selector valve has a pipe plug which should be removed and replaced by a
pressure gage or connecting line to a pressure gage. .Pressure reading at this point will be "clutch-apply pressure" oil.
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