8
ADJUSTING RELIEF VALVES
8-1 Main Relief
The main relief valves are located on the main control valves and are set at 2600 psi. The main relief
(Please see illustration on page 15 part # 5) will limit the amount of pressure that can be built up in
the system.
To check the main relief setting.
Lower the lid.
Push the valve handle away from you to build pressure.
The valve needs to be all of the way open.
Read the pressure gauge on the valve.
This pressure is the main relief pressure and should read 2600 psi.
To adjust the pressure, follow these steps. You will need a 3/4-inch wrench and a 1/4-inch Allen
wrench. - The valve adjustment is located on the back-left side of each control valve.
Remove the dust cap with ¾ inch wrench.
Loosen the nut with ¾ inch wrench.
Hold the valve all the way open.
To adjust the relief to 2600 psi, turn it with a 1/4-inch Allen wrench.
Turn in (clockwise) to increase pressure.
Turn out (counterclockwise) to decrease pressure.
Tighten the nut while holding the Allen wrench in place to keep the setting from changing.
Check the setting after the nut is tight, in some cases it will have changed and you will have to
adjust a second time.
8-2 Standard Speed Cylinder Relief
The cylinder relief valves are located on the back of the main control valves and should be set at 2800
psi. (Please see illustration on page 13 part # 14)
This relief allows the cylinder to extend during the rock cycle, when the opposite end is pulling down
and teeter-tottering the lid over the load
As long as the main control valve can achieve 2600 PSI the bypass won’t need to be adjusted
To adjust the pressure, call the Factory.
8-3 High Speed Cylinder Relief
The cylinder relief valves are located on the side of the bypass valve and should be set at 2800 psi.
(Please see illustration on page 24 part # 5)
This relief allows the cylinder to extend during the rock cycle, when the opposite end is pulling down
and teeter-tottering the lid over the load
As long as the main control valve can achieve 2600 PSI the bypass won’t need to be adjusted
To adjust the pressure, call the Factory.
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