KB21 Service Manual Pub 09-14
37
sSection 30
Control Circuits
The Terrain King utilizes hydraulics to power the control system which moves the boom as well as the
motor circuit to spin the blades of the mower deck on the boom mowers.
Utilization of hydraulic systems enables a large amount of power to be transferred through small tubes
and hoses to a wide array of actuators and motors with very high power density.
The use of hydraulics involves a hydraulic transmission which can be related to mechanical transmis-
sions designs and “gear ratios”.
In the diagram, if the small cylinder is 1 inch in radius and the large is 10 inch in radius, and the force
exerted on the small cylinder is 10lbs, the resulting force on the big cylinder would be 100 times the
smaller or 1000lbs. However, the small piston would need to move 100 inches to move the large one
1 inch.
The most common example is a bottle jack used to lift a car.
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