Table of Contents
Advertisement
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
STRAIGHT-TRAVEL VALVE
Function
•
When the travel is operated at the same time as
the boom, arm, or bucket, the pressure oil flow-
ing to the left and right travel circuits is divided
and sent to the boom, arm, or bucket circuit.
•
If the oil in one travel circuit is divided off, the
amount of oil supplied to the travel motor will be
less than in the travel circuit which is not divided,
so the drop in the supply of oil to the travel motor
will cause the machine to deviate.
1) When travel is operated independently
Operation
•
No pilot pressure flows from the travel shuttle
valve, so the straight-travel valve is not actuated.
•
Because of this, port PL (L.H. travel circuit) and
port PR (R.H. travel circuit) are not interconnect-
ed, and each circuit remains independent.
PC600, 600LC-7
•
To prevent this, the straight-travel valve is
switched to interconnect the left and right travel
circuits. This ensures that the amount of oil sup-
plied to the left and right travel motors is equal.
•
As a result, the left and right travel motors both
rotate at the same speed, and there is little travel
deviation.
CONTROL VALVE
10-77
Advertisement
Chapters
Table of Contents
