BULLDOZER AR-SEMI-UNIVERSAL 2547592 - Caterpillar

Table 5
Example
D9T with a 22 degree standard 251-7756 Fan Spider As
Target clip speed from Table 3 is 1150 RPM.
Ambient temperature of 20° C (68 ° F)
Atmospheric pressure of 95 kPa (13.78 psi)
The correction Factor from Table 3 is 1.02.
The corrected target clip speed is: 1150 RPM * 1.02 = 1173 (+25/-0) RPM
Select the Status tab in Electronic Technician. Select Pressure Parameters. Note the atmospheric pressure, this pressure will be used later in the procedure.
Note the approximate ambient air temperature, this temperature will be used later in the procedure. There is no parameter in Electronic Technician available for this parameter.
Determine the corrected fan rpm based on the atmospheric pressure and the ambient temperature at your location.
Adjust the fan bypass override to bring the clip speed to the corrected target clip speed that was determined in Step 3. Decreasing the fan override will INCREASE fan speed. Increasing the fan override will DECREASE fan speed.
Use CAT ET to check the fan pump pressure. Record the exact fan pump pressure when the clip speed is at the corrected target.
Display the engine configuration screen in CAT ET. Enter the corrected pump pressure that was recorded in Step 5 on the line that is labeled "Engine Cooling Fan Maximum (Clip) Pump Pressure".Note: The "Engine Cooling Fan Maximum (Clip) Pump Pressure" value is read by the engine ECM. The engine ECM regulates current to the pump control solenoid. The pump control solenoid regulates the fan speed. Also, the pump control solenoid makes sure that the pump pressure never exceeds the "Engine Cooling Fan Maximum (Clip) Pump Pressure" that is configured in Step 6.Test and Adjustment for the Fan Reversing Relief Valve
Note: The fan reversing relief valve cannot be adjusted on the machine. The fan reversing relief valve has a setting that is higher than the maximum mechanical high-pressure setting and must be set at a corresponding flow rate. Use the following procedure to test and adjust this valve.Bench Test
Table 6
Required Tools
Part Number Description Quantity
257-5616 Test Manifold Block 1
Illustration 13 g02714860
(7) Relief valves
(8) Locknut
(9) Adjustment Screw
Remove the relief valves (7) from the reversing valve.
Use the 257-5616 Test Manifold Block to test the fan reversing relief valves (7) on the test bench. Torque relief valves to 53