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TM 9--2815--247--34
0004 00--11
THEORY OF OPERATION -- CONTINUED
0004 00
COOLING SYSTEM -- CONTINUED
Fan Drive and Clutch The fan clutch is oil--cooled (Figure 1--11). The fan clutch drive and driven disks are loaded
by the centrifugal action of clutch balls and springs housed in the clutch assembly. The balls and springs are in the
driven member and apply upward force to the clutch disks. The clutch oil enters the fan drive vertical shaft from
the fan drive housing through an annular groove in the shaft. The oil flows through a central hole in the shaft to a
distributor where it is dispersed to the ball bearings and to the clutch disks. The oil moves between the clutch disks
by centrifugal action and drains back through the fan drive housing into the engine oil pan.
Engine and Transmission Oil Coolers All transmission and engine oil cooling is accomplished by external oil
coolers (Figure 1--1). The oil coolers are located on the sides of the engine above the cylinders. Air is drawn
through the oil coolers by the cooling fans. A thermostatic control valve in each oil cooler controls the temperature
of the oil from the cooler by permitting cold oil to bypass the coolers. This valve also permits oil to bypass the cool-
er in the event that the cooler becomes clogged.
CLUTCH UPPER
BALL BEARING
DOUBLE LIP
OIL SEAL
COOLING FAN
COOLING FAN
CLUTCH ASSEMBLY
OIL FROM MAIN
OIL GALLERY
OIL DRAIN
HORIZONTAL
FAN DRIVE SHAFT
VERTICAL FAN
DRIVE SHAFT
OIL DRAIN
CLUTCH LOWER
BALL BEARING
Figure 1--11. Mechanical Cooling Fan Clutch
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