U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-22
f. Straight travel circuit
(1) Feature
The following points are ensured even when a front attachment (boom, arm, bucket, etc.) is operated
while traveling.
1) The machine keeps running straight.
2) The machine keeps running at the same speed.
(2) Working effect
1) When loading and unloading the machine on and off a truck, the front attachments can be moved
up and down for safe, efficient work.
2) Before lifting pipes, the front attachment can be positioned exactly to the pipes while the machine
is traveling.
(3) Operating
When the boom, arm, bucket or service port is used while traveling, the signal line of the related spool is
activated to shut off the passage leading to the tank. The Pp' port then gets under pressure, which
switches the spool of the straight travel section.
So the oil that is supplied from the pump 3 flows to the boom, arm, bucket or service port. In this design,
the machine can keep running straight.
The oil flow when the machine travels and the boom is raised is shown on the next page.
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