Swing
Independent swing operation
(6)
刮
During the swing operation, the pilot pressure enters through port PAs (or PBs) and transfers the
swing spool. The pressurized oil entering through Port P2 flows to Port As (or Bs) and is supplied
to the swing motor. The return oil from the swing motor enters Port Bs (or As) and returns to the
hydraulic oil tank through the tank port (T1).
Swing operation preference function
[Pilot Circuit]
The pilot pressure enters through Port PSp to transfer the swing priority spool (395).
[Main Circuit]
Due to transfer of the swing priority spool, the open area of the swing priority spool decreases,
and the most of the pressurized oil entering through port P2 flows to the swing side to make the
swing operation most preferential.
刯
PSp
the open area decreases
from port P2
SWING PRIORITY SPOOL
3607A2MC22
2-35
