TM 9--2350--292--20--1
0005 00--7
THEORY OF OPERATION -- CONTINUED
0005 00
COOLING SYSTEM
Air Cooling Air for cooling enters the engine compartment through the grille doors. The top of the engine is shrouded
and encloses two gear--driven, axial--flow fans (1) which draw air through the cylinder fins and engine (2), transmission
oil coolers (3), hydraulic oil coolers (4) and discharge the hot air vertically from the shroud. Sheet metal baffles and de-
flectors direct the flow of cooling air across the cylinders.
The cooling fans (1) are attached to hubs and are mounted on shafts which are driven by the engine--driven fan drive
clutch assembly (5).
The vertical fan drive shaft (6) is driven by a horizontal drive shaft (7).
The fan clutch assembly (5) is oil--cooled. The fan clutch drive and driven disks are loaded by the centrifugal action
of clutch balls and springs housed in the clutch assembly (5). 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 (6) from the fan drive hous-
ing through an annular groove (8) in the shaft. The depth of the groove (8) controls the amount of oil flow. The oil
flows through a central hole in the vertical shaft (6) to a distributor where it is dispersed to lubricate the cooling fan
(1) and clutch assembly (5). The oil circulates by centrifugal action and drains back through the fan drive housing
into the engine oil pan. The fan drive clutch assembly (5) is designed to slip under deep water fording conditions
where the resistance of water exceeds the friction of the clutch assembly (5).
Oil Cooling Two engine (2) and two transmission oil coolers (3) are mounted on the sides of the engine above the
cylinders. Two hydraulic oil coolers (4) are mounted on top of the left and right transmission oil cooler frames. The
cooling fans (1) draw air through the oil cooler cores to cool oil being circulated within the coolers (2, 3 and 4).
1
1
1
3
2
4
4
5
8
7
6
