TM 5-3810-306-20Oil CoolerAn air cooled hydraulic oil cooler is mounted on the right side of the superstructure. The oil cooler consists of a hydraulicradiator, a hydraulic motor, a fan, and a fan guard. The fan is driven by the motor which receives its oil flow from thepressure-beyond of the tele/rear steer/lift valve bank. The fan blows air through the cooling fins on the cooler. All of thehydraulic oil returns (from the major crane functions) through the dual return lines via swivel port No. 11. This line has a15 psi (103.4 kPa/1.03 bar) in line check valve which is normally closed and does not permit flow. Normally all oil is routedto the return manifold, through the oil cooler, and on to the hydraulic filter in the reservoir.When several hydraulic functions are being used at one time (i.e., hoisting, lifting, and telescoping), more oil has to flowthrough this one line causing a pressure buildup in the dual port return system. When this pressure reaches 15 psi (103.4kPa/1.03 bar), the normally closed check valve will open and permit some oil to bypass the oil cooler and flow directly intothe reservoir filter. When fewer functions are being used, the pressure in the system will decrease below 15 psi (103.4kPa/1.03 bar) and the check valve will close.As mentioned above, the oil cooler fan motor is driven by oil from the tele/rear steer/lift circuit when the control valve is inneutral. If any of the three functions is activated, the oil exhausts directly into the return manifold and the fan motor stop srunning. In addition, if the temperature of the oil in the return manifold falls below 111 degrees F (44 degrees C), an oilbypass valve will direct oil around the motor, causing the motor to stop. The motor will restart when the oil temperaturereaches 120 degrees (49 degrees C).Oil Cooler MotorThe hydraulic motor consists of two meshed gears in a closely fitted housing with inlet and outlet ports opposite eachother. The two gears mesh and rotate together with only one gear coupled to the drive shaft. The motor torque isdeveloped through pressure on the surfaces of the gear teeth. Oil enters the inlet exerting pressure on the gear teethcausing them to rotate. Oil is carried to the outlet port in chambers formed between the gear teeth and housing.Hydraulic Pump DisconnectThis disconnect assembly is provided for cold weather starting and consists of a housing, lever, movable collar, and asliding splined sleeve. Moving the lever actuates the movable collar within the housing which in turn slides the splinedsleeve on the splined pump shaft to engage the sleeve with the splined shaft of the torque converter drive. The disconnecthousing is initially filled with one pint of transmission fluid and during operation the torque converter will spray transmissionfluid into the housing to lubricate the disconnect.1-35
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