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4. FUNCTION
2-14
IN NEUTRAL (When all spools are in neutral position)
The oil discharged from the hydraulic pump flows into control valve P1 port, and then flows
through P1 and P2 supply body the P1 side travel spool. The oil flows through the bypass
passage in the direction of travel
Ą
boom
Ą
bucket spool, and then flows from the bypass
passage to the tank passage in the bucket section.
The oil discharged for the hydraulic pump flows into the control valve from P2 port, and then
flows through P1 and P2 supply body to the P2 side travel spool. The oil flows through the
bypass passage in the direction of travel
Ą
arm
Ą
PTO spool, and the flows from the bypass
passage to the tank passage in the PTO section.
The oil discharged from the hydraulic pump flows into the control valve from P3 port, and then
flows through the parallel passage of dozer, boom swing, and swing. The oil that has followed
into the parallel passage flows through the bypass passage in the direction of dozer
Ą
Boom
swing
Ą
swing spool, the connecting spool land, the P2 side parallel passage, the bypass
passage from arm to PTO spool, the bypass passage in the PTO section, and then to the tank
passage.
Since each line (P1, P2, P3) is supplied with oil from the pump, the section is operatable; therefore,
do not operate the control valve except the working time.
Â
P1 line : Travel, boom, bucket
Â
P2 line : Travel, arm, PTO
Â
P3 line : Dozer, boom swing, arm, PTO, boom (up only)
When PP1 port is applied with pilot pressure, the oil flows into the travel independent passage
via an orifice.
With the spool in neutral, the oil flows into Dr1 port provided in the P1 and P2 supply body.
1
1
)
P1 :
P2 :
P3 :
ö
PP1 :