JPH0333859B2 - - Google Patents

Info

Publication number
JPH0333859B2
JPH0333859B2 JP14031089A JP14031089A JPH0333859B2 JP H0333859 B2 JPH0333859 B2 JP H0333859B2 JP 14031089 A JP14031089 A JP 14031089A JP 14031089 A JP14031089 A JP 14031089A JP H0333859 B2 JPH0333859 B2 JP H0333859B2
Authority
JP
Japan
Prior art keywords
pilot
operating
switching valve
valves
directional switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP14031089A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0235120A (ja
Inventor
Tadashi Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP14031089A priority Critical patent/JPH0235120A/ja
Publication of JPH0235120A publication Critical patent/JPH0235120A/ja
Publication of JPH0333859B2 publication Critical patent/JPH0333859B2/ja
Granted legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
JP14031089A 1989-06-02 1989-06-02 パイロット操作方式の油圧ショベル用油圧回路 Granted JPH0235120A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14031089A JPH0235120A (ja) 1989-06-02 1989-06-02 パイロット操作方式の油圧ショベル用油圧回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14031089A JPH0235120A (ja) 1989-06-02 1989-06-02 パイロット操作方式の油圧ショベル用油圧回路

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2268684A Division JPS60168904A (ja) 1984-02-09 1984-02-09 パイロット操作方式の油圧ショベル用油圧回路

Publications (2)

Publication Number Publication Date
JPH0235120A JPH0235120A (ja) 1990-02-05
JPH0333859B2 true JPH0333859B2 (en]) 1991-05-20

Family

ID=15265825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14031089A Granted JPH0235120A (ja) 1989-06-02 1989-06-02 パイロット操作方式の油圧ショベル用油圧回路

Country Status (1)

Country Link
JP (1) JPH0235120A (en])

Also Published As

Publication number Publication date
JPH0235120A (ja) 1990-02-05

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term