TM 55-2835-208–23
1-14. LUBRICATION SYSTEM
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OIL RESERVOIR. The oil reservoir is a part of the reduction drive assembly. A magnetic
drain plug, high oil temperature switch and oil and drain plug are located at the base and
bottom of the oil reservoir. An oil level sight-glass and a dipstick are mounted on the
reduction drive.
OIL PUMP. The oil pump is a part of the reduction drive assembly. The oil pump draws oil
from the oil reservoir and pumps oil through drilled passages to the oil filter.
OIL FILTER. The oil filter is a disposable, 10 micron filter element contained in a filter
cavity in the reduction drive assembly.
FILTER BYPASS VALVE. The filter bypass valve consists of a spring-loaded ball in a
housing above the oil filter. The housing serves as a cap for the filter. The bypass valve
opens to allow oil to bypass the oil filter should the oil filter become clogged.
OIL PRESSURE RELIEF VALVE. The oil pressure relief valve is located in the main oil
gallery. The oil pressure relief valve regulates system oil pressure between 15 and 40 psig.
HIGH OIL TEMPERATURE SWITCH. The high oil temperature switch is located in the
reduction drive assembly, and is electrically connected to the ESU. The ESU monitors the
oil temperature, and the high oil temperature switch activates a cockpit indicator when the
temperature exceeds a preset limit.
OIL PRESSURE SWITCH. The oil pressure switch is located in the reduction drive assem-
bly, and is electrically connected to the ESU. The ESU monitors the oil pressure, and the
oil pressure switch shuts down the engine if the pressure drops too low.
OIL PUMP DRIVE GEAR. The oil pump drive gear is driven by the output shaft. The
turbine assembly input pinion drives the oil pump.
OIL DIPSTICK AND CAP. The combined oil dipstick and cap is mounted on the left side
of the reduction drive assembly. The oil dipstick and cap is used to check the oil level and
service sump.
SIGHT GAGE. The sight gage is located on a portion of the oil reservoir housing of the
reduction drive assembly. The sight gage provides for visual viewing of oil level.
MAGNETIC CHIP DETECTOR AND PLUG. The magnetic chip detector and plug is a
two part plug which is mounted in the front end of the reduction drive assembly. The
magnetic chip detector and plug is used to collect metal chips.
DRAIN PLUG. The drain plug is located at the bottom of the reduction drive assembly.
The drain plug is used to drain the oil.
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