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2-75
Counterbalance valve
Av port is connected to a hydraulic pump; Bv port is connected to a tank.
An oil supplied from a hydraulic pump presses check valve and flows into L port. It makes a
hydraulic motor circulated. The oil pressure out of a pump is increased and transferred to spring
room M through the path G because negative brake is working on. When the pressure of room M
exceeds the force of spring that keeps spool at its neutral position, the spool begins to move the
right side.
An oil in room N is sent to room M by orifice I and discharged from G line to a tank.
Then the spool moves to the right and the oil flows from K to Bv.
Av
Bv
N
I
G
L
K
M
Spool
Check valve
21078TM08
4)
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...