Hyundai HX140L, Manual

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Working description of automatic switch (at high speed)
At normal speed, once the hydraulic oil which is through the inner path of spool (47) flows into high
speed switching pressure port (the pressure of external pilot : Pi = 35 kgf/cm
2
) spool (47) moves
from right to left.
At high speed, turning pressure of motor (D1) is over 250 kgf/cm
2
, when the power forcing to spool
(59) (pressure, P1) is stronger than spool (47) and spool (59) is pushed out, after then spool (47)
moves from left to right. So it is switched.
Av
Bv
D
D1
47
59
2 speed passage
2 Speed
changeover
pressure port
2 Speed line
(High Speed)
21078TM10
(High speed)
6)