PUMP GP-VANE 1238509 - Caterpillar

Checking Performance of the System (Fine Tuning Offsets)1. Move the machine to a flat surface. Lower the screed to the ground. Pull the machine slightly forward taking the slack out of the tow point. 2. Move the tow point cylinders to the center position.3. Put the screed thickness controls to null. 4. The following conditions must be met during the performance check: The park brake must be applied.The machine must be in pave.The maximum speed potentiometer must be at the 50% position.The propel control must be forward.The engine must be at high idle.The hydraulic temperature must be at 38° C (100° F).5. Put the control box for the system in the Slope position. Null the control.6. Use the grade adjustment knob and turn the knob clockwise by one click. Observe the movement of the tow point cylinder. The cylinder should move about 1/2 inch in 2 or 3 seconds.If the cylinder does not make a complete change in 2 or 3 seconds, you should increase the offset of the valve. If the cylinder moves too fast, you should decrease the offset of the valve. If the cylinder overshoots the correct position and the cylinder then returns, you should decrease the offset of the valve. The valve offsets should always be set with the tow point cylinders at the center position or near the center position.7. Access the menu for the performance. Make the changes that are required to the offsets until the criteria for the performance of the system is met.8. Repeat the procedure for the opposite direction.9. Repeat the procedure for the opposite side of the machine.COPYRIGHT 2001 CATERPILLAR ALL RIGHTS RESERVED