Kick-down sequence cartridges from Sun Hydraulics were used in a trucking application where the customer wanted to be able to see the pressure rise in the jack when the jack legs first contacted the ground. Although the original dual sequence package performed to specification, high internal mechanical friction, together with the small bore of the extension cylinders, caused a high pressure setting for the sequence valve, thus causing the jack cylinders to lower at a much higher pressure than was needed. This resulted in incorrect feedback of the jacking pressure to the operator, along with wasted horsepower when lowering the four jack legs.
The solution was to sequence the extension and jack cylinders so that the jack legs extended to full width before the jack cylinders lowered the legs to lift the vehicle. When raising the jacks, the reverse scenario was required, with the jack cylinders being raised before the jack legs retracted.
The simplified solution
Although kick-down sequence cartridges open at a preset pressure, they differ from standard sequence valves in that they shift and stay open, much like a 2-way directional valve, and do not maintain the sequence pressure in the primary circuit. By changing the original RS*C-*** valves to SQ*B-*** kick-down sequence cartridges, the jack legs could now be lowered at the actual pressure needed by the jack cylinders. This made it very easy for the operator to detect ground contact, and the pressure shown on the gauge while lowering the jacks represented the jack pressure, not the sequence pressure setting.
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