solenoids should never be on at the same time, and when both are off, the in- and outlets of all
cylinders are cut off from the pump supply, which in turn is shunted directly back to the
reservoir.
The only difference between RAISE WEIGHT and DROP modes is additional powering of
the C valve in DROP mode, which will cut off the return oil from the raise weight cylinder,
creating an excess pressure below the piston of this cylinder, a pressure that will propagate
through a centre bore in the shaft to a small release piston in the catch, which will then release
and drop the weight.
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