Hyundai HX140L, Manual

Page: 87 / 819

2-32
BUCKET IN OPERATION WITH BOOM OPERATION (TYPE 1)
When combined operation, mostly same as previous page but the fluid from P1 bypass passage
is empty.
So only the fluid from P1 parallel passage is supplied to the bucket cylinder. Also, parallel
passage is installed the orifice of bucket logic valve for supplying the fluid from pump A2 to the
boom operation prior to the bucket operation. In case of the bucket out operation with boom
operation, operation is similar.
Also the boom up operation, the boom up pilot pressure is supplied the pilot port (P04) of bucket
spool stroke limit and the piston is shifted to the right and then the bucket in spool stroke is limited
and the open of the bucket in spool is reduced.
Accordingly, the oil of the bucket in spool is reduced and the boom speed up. (3)
B5
A5
Tank passage
From RCV
Bucket spool
Orifice
P1 Parallel passage
Pa5
Bucket logic valve
P04
Piston
140L2MC29