SHIM 3K3209 - Caterpillar

Correct valve speed settings in the automatic control system depend on the type of material that you are moving (for example, sand, hard rock, or dirt) and the tasks you are doing (for example, base grade or finished grade).Note: A temporary design surface is created for adjusting the valve speeds. The lightbars provide guidance to the temporary design surface only while the "Valve Speed" dialog is open.To adjust the valve speeds, complete the following steps:
Make sure that the AccuGrade System is generating cutting edge position information consistent with the job you are to work on.
Make sure that the valves have been calibrated.
Adjust the throttle so that the engine is running at the operating RPM.
Using the automatic controls, cut a test pass in the material you are working, so that you can judge the current performance of the automatic controls. If the cut surface shows long period waves (wave length greater than about 2 m (6.5 ft), the valve speed may be too low. If the cut surface shows the blade is jittery, the valve speed may be too high.
Set the Auto/Manual switches to Manual.
From any guidance screen, press the Menu key (11) .The "Setup Menu - Configuration" dialog appears.
Select "Valve Speed".A full screen message appears.
Raise and level the blade of the machine.This is the elevation at which the temporary design surface is created.
Press the "OK" key (10) .The temporary design surface is created, and the "Valve Speed - Select Valve" dialog appears.
Select the valve to tune.
Illustration 12 g01362824
Press the "OK" key (10) .A dialog that is similar to Illustration 12 will appear.
Do one of the following actions:
Move the slider to increase or decrease the valve speed.
Press "Default Set 50" in order to set the speed to the default value of 50.The valve speed is immediately updated.
Move the blade until the lightbars indicate that the blade is above the on-grade position or below the on-grade position.
Set the Auto/Manual switches to Auto.
Watch how quickly or slowly the blade moves to the on-grade position:
Note if the blade moves slowly, but with no overshoot and correction. The valve speed may be too low.
Note if the blade moves quickly, but with overshoot and correction. The valve speed may be too high.Note: The behavior of the automatic controls when they are not loaded by material does not provide enough information to tune the valve speed by itself. You should always use this information in conjunction with the results of a test pass.
Set the Auto/Manual switch to Manual.
Press the "OK" key (10) in order to confirm the settings, or press the Escape key (4) in order to exit without saving.
Repeat Step 10 through Step 17. Make incremental changes to the valve speed until the surface cut during the test passes meets your requirements.Note: If the test passes still do not meet your requirements, use the "Stability" setting for faster or slower machine speeds.Set Vertical Offset
For lift guidance methods, the vertical offset is first set when you specify the reference elevation during the benching of the lift