GC-35 Control Box Features and Setup
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
Valve Offsets (Raise and Lower)
Valve Offsets is the minimum amount of electrical signals sent to the valve which causes the hydraulic cylinder
to move. I f the valve offset is too small, the sensor will not reach On-Grade. Likewise, if the valve offset value
is too large, the sensor will move too much and overshoot On-Grade.
Valve offsets should be set before adjusting elevation and slope gains, and averaging. The paver should be run
until the hydraulic oil is at normal operating temperature before setting the valve offsets. Once they are set, you
should not need to readjust the valve offsets unless the Control Box is moved to a new paver, or the hydraulic
• Valve Offset value range – 1 to 999
• Factory preset – 135
1. Select Valve Offsets raise:.
2. Turn the Grade Adjustment Knob counter clockwise, decreasing the Valve Offset - raise value until
the hydraulic cylinder no longer moves. Then slowly rotate the Grade Adjustment Knob clockwise until
the hydraulic cylinder just begins to move up.
3. Repeat for Valve Offsets lower:.
Figure 57: Valve Offsets
Averaging changes the amount of damping, or filtering, applied to Sonic Tracker and Laser Receiver
measurements. You can think of it as a calculation of the running average of the elevation measurement over
a period of time.
Set the Valve Offsets first, before setting any other Performance Menu items.
The offset value on one side of the paver may differ from the offset value on the other side of the
paver. You must verify the offset values before swapping boxes. Use the “Left” and “Right” labels
Never attempt to use Valve Offsets to compensate for a slower raise or lower speed of your hydraulic
valves, as it causes undershooting or overshooting in Slope Mode and can adversely affect the quality
of the mat.