At this point they are considered incertae sedis;in other words, we know that they are theropods; and probably coelurosaurs; but we don't know who they are related to or how they fit into the big picture of theropod phylogeny.
Idle speed is adjusted by means of the idle control valve, which is a solenoid-operated valve that is generally automatically adjusted by a computer. One problem that can occur with this component is a loss of power (from a severed line or a short) but a more common problem is simply dirt and grime.
The pattern select valve is actuated to select either a âbackhoe patternâ or an âexcavator patternâ as described below. shows the valve 220 in a state corresponding to a backhoe pattern. The two pilot control valve assemblies 40, 42 hydraulically control the positioning of control spools 206, 208, 210, 212.o accomplish the switch, the location of the backhoe boom and crowd functions as between the levers 34, 36, are switched. The pattern select valve 220 can include two, two-position four-way solenoid operated valves 260, 262. These valves are controlled by the two-position pattern select switch 39.