HANDRAIL AS 3367782 - Caterpillar

Pressure Adjust for the Fan Control Restrictor Valve
Illustration 9 g02131393
(1) Compensator Valve (2) Adjustment screw for the margin pressure (3) Locknut (4) Adjustment screw for the cutoff pressure (5) Locknut (6) Adjustment screw for the restrictor valve (7) Locknut (HFPS) Load sensing signal pressure tap (HFRP) Restricted pressure tap (HFPD) Pump discharge pressure tap
Remove the floorplate.
loosen locknut (7) . Turn adjustment screw (6) on the restrictor valve clockwise in order to raise the restricted pressure and turn adjustment screw (6) counterclockwise in order to lower the restricted pressure.
After the correct pressure adjustment is set and then checked, tighten locknut (7) .
Check the implements for the proper operation. For an additional check, refer to Troubleshooting, "Pilot System Pressure - Test and Adjust" in order to check the pressure of the pilot system.
Remove the test equipment and install the floorplate.Fan Speed Checks
Place reflective tape on the fan hub.
Install tooling (F) with magnetic base near enough to read fan speed without the fan hitting the phototach.
Use the Electronic Technician to vary the fan override percentage until the pressure for the fan is equal to the "Max Fan Pump Pres" that is set in the software.
The fan speed will vary with the number of blades on your fan.Approximate Fan Speed8 Blades ... 1200 50 RPM11 Blades ... 1000 50 RPMNote: Fan speed should not be adjusted. Fan speed will vary with the density of the air and the oil temperature. Higher altitudes and air temperatures will result in higher fan speed.Margin Pressure Test and Adjust for the Fan Pump
Machine Preparation
Illustration 10 g02131393
(1) Compensator Valve (2) Adjustment screw for the margin pressure (3) Locknut (4) Adjustment screw for the cutoff pressure (5) Locknut (6) Adjustment screw for the restrictor valve (7) Locknut (HFPS) Load sensing signal pressure tap (HFRP) Restricted pressure tap (HFPD) Pump discharge pressure tap
Refer to Step 1 through Step 10 in "Machine Preparation for Maximum Fan Speed and Pump Pressure".
Locate load sensing signal pressure tap (HFPS) . Locate pump discharge pressure tap (HFPD) . The pressure tap is located on the bottom of the restrictor valve.
Connect Tooling (D) between pressure tap (HFPS) and pressure tap (HFPD) .
Install the floorplate. Make sure that the floorplate does not interfere with the test equipment.Margin Pressure Test for the Fan Pump
Check the margin pressure for the fan pump.
Connect the Electronic Technician to the terminal connection that is located at the lower left dash in the operator station.
Start the engine and warm up to approximately 60 deg C (140 deg F).
Initialize the Electronic Technician with each ECM.
The Electronic Technician screen should display a connected status with each of the four electronic control modules on the machine.Note: If the Electronic Technician screen shows an unconnected status, then check the cables and the communication adapter for possible problems.
Select "Engine Control" screen.
Select "Diagnostics Test".
Select "Override Parameters".
Select "Engine Fan Speed".
Select "Change Parameters Value".
Set the engine to HIGH IDLE and input a New Value of 60 percent on the Electronic Technician .
Select "Status" screen.
With the engine set to HIGH IDLE,