GASKET KT- 6V6386 - Caterpillar

Illustration 1 g00937847
Fan drive hydraulic system (1) Fan drive motor (2) Makeup valve (3) Fan drive pump (4) Pump drive (5) Pressure reducing valve (fan drive) (6) Oil filter (case drain) (7) Solenoid and relief valve (8) Oil filter (steering and fan drive) (9) Oil cooler (steering and fan drive) (10) Hydraulic tank
Illustration 2 g00992962
Left side view of fan drive lines (2) Makeup valve (3) Fan drive pump (4) Pump drive (5) Pressure reducing valve (fan drive) (6) Oil filter (case drain) (7) Solenoid and relief valve (10) Hydraulic tank
Illustration 3 g00993016
Rear view of fan drive lines (1) Fan drive motor (2) Makeup valve (11) RadiatorOil flows from fan drive pump (3) through makeup valve (2) to fan drive motor (1). Oil flows from the motor through makeup valve (2). The oil flows from makeup valve (2) through oil filter (8) and oil cooler (9) to hydraulic tank (10) .Fan drive motor (1) is a fixed displacement motor. The fan speed is determined by the amount of flow from fan drive pump (3). Fan drive pump (3) is a variable displacement piston pump that is controlled by the Brake/Cooling ECM.Case drain oil flows from fan drive motor (1) and fan drive pump (3) through case drain oil filter (6) to hydraulic tank (10) .If the supply oil to the fan stops suddenly, the fan and the motor may continue to rotate because of the mass of the fan. Makeup valve (2) allows the oil in the circuit to flow from the return side to the supply side. This prevents a vacuum in the lines on the supply side.Pressure reducing valve (5) utilizes steering system pressure in order to keep the fan speed below 10 rpm in cold weather. The fan speed should never be 0 rpm.Fan speed is controlled by the Brake/Cooling ECM. Fan speed will vary depending on many inputs.The minimum fan speed will be below 10 rpm. The minimum fan speed will occur when all of the temperature inputs are cold.The following inputs determine the fan speed:
Jacket water coolant temperature
Aftercooler coolant temperature
Transmission lube temperature
Torque converter outlet oil temperature
Brake oil temperature
Brake status
Ground speed
Table 1
Standard Fan Speed Control Limits (RPM)
106 Inch Fan    
Engine Speed     Non-Retarding Fan Speed Limit     Retarding Fan Speed Limit    
1250 or Less     321     500    
1300     334     500    
1450     414     500    
1500     386     500    
1600     411     500    
1700     437     500    
1750     450     500    
1800     450     500    
1841     450     500    
1900     450     500    
1910     450     500    
1950     450     500    Refer to Table 1 for the fan speed limits that are based on the temperature sensor inputs, the ground speed and the retarding/braking inputs.
Table 2
Engine Fan Control, Non-Retarding Or Retarding Below 4 MPH
106 Inch Fan    
Aftercooler Temperature     Jacket Water Coolant Temperature     Transmission Lube Temperature