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10 Structure, function and maintenance standard
Travel junction valve
1.
When pilot pressure is turned ON
Function
q
This valve connects the L.H. and R.H. travel
circuits via travel junction valve so that the
hydraulic oil will be supplied evenly to both
travel motors to improve machine's straight
travel performance.
When the machine is steered, outside pilot
q
pressure (PST) closes the travel junction valve
to improve steering performance.
PC300, 350-8
Operation
q
Pilot pressure from the travel junction solenoid
valve contracts spring (1), and travel junction
spool (2) moves to the left to the stroke end.
q
Junction circuit between port (PTL) (L.H. travel
circuit) and port (PTR) (R.H. travel circuit) is
closed.
SEN01994-01
39
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Troubleshooting
