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EXPLANATION OF HOIST DOWN CIRCUIT
HYDRAULIC
Hoist Down Relief – The TS1 valve is a two position / three way proportional pressure valve. It serves multiple
functions. In its non-energized state, it provides a constant 100 PSI of down force on the rod side of the hoist cylinder.
When the hoist is raising, the oil from the rod side of the cylinder is drained back through this valve.
This valve is energized when lowering a DA hoist cylinder. Its purpose is to provide an adjustable pressure / down
force to the rod-side of the cylinder. The pressure setting of this valve is adjustable as a function of electrical current
(Maximum setting = 1000 PSI).
CP2 – Provisional Cavity – This cavity can be used to populate another SP valve in order to achieve faster hoist lower
speeds.
CV7 and CV11 – CV7 and CV11 are back-to-back check valves. Their purpose is to communicate the higher of the two
hoist pressures back to the RV1 boost pressure relief.
CV6– Hoist Shuttle Cartridge – Load Holding Check – The purpose of this valve is to hold the hoist suspended in the
air after oil has passed through the SP4.
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