TM 5-3805-281-24-1
Theory of Operation
SWING MOTOR CROSSOVER RELIEF VALVE OPERATION
seat to relieve pressure oil to return. The pressure is
The function of swing crossover relief valve (J) is to
also sense in the chamber (E) through the orifice (G).
relieve the high pressure generated in the swing circuit
The opening of the relief poppet is further dampen by
when starting or stopping the swing operation. The oil
the action of the piston (C), spring guide (B), and
pressure in the swing circuit becomes high because of
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spring (A). Oil from the spring (A) chamber is release
the inertia of the upperstructure to starting and
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through the orifices in the spring guide and piston to
stopping.
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the return passage (D). The relief poppet is push back
to the right by the spring (F) and the pressure in the
When the oil pressure in port (I) increases to the valve
chamber.
pressure setting, the relief poppet (H) is push off its
CED,TX08227,3173
1904JUN981/1