TM 5-3805-280-24-1
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 sensed 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 dampened
when starting or stopping the swing operation. The oil
by 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
05
through the orifices in the spring guide and piston to
stopping.
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the return passage (D). The relief poppet is pushed
back to the right by the spring (F) and the pressure in
When the oil pressure in port (I) increases to the valve
the chamber.
pressure setting, the relief poppet (H) is pushed off its
TX,05,GG2195
1920MAY981/1
6-63
