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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
The transmission oil system lubricates and cools the transmission. A gear driven
pump, with a
screened inlet is mounted in the sump case. Oil is pumped through an
internal line to the main oil manifold and filter, located on the left side of the transmission.
A thermostatic valve then directs the oil to either the oil cooler or pressure regulator,
depending on the temperature. Oil is then routed to the eight main jets for delivery to
the gears and bearings. Each of the removable jets are internally screened to prevent
foreign material from blocking the oil spray. The filter incorporates a bypass valve,
which opens if back pressure occurs due to cold temperature or clogged filter. The oil
manifold contains an oil temperature switch and bulb, and an oil pressure transmitter.
TRANSMISSION LUBRICATION
The transmission oil system is completely independent. It has its own internal oil reservoir,
internal oil pump, filter, oil coolers, and monitoring system. Oil passes through a portion
of both
engine heat exchange cores to insure transmission cooling during one engine
operation. Oil capacity is 9.8 liters (10.4 U.S. quarts). An oil level sight glass is located
on the
left side of the transmission.
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