LK30
1. SPECIFICATIONS ........................................ 9-2
1.1 Oil pressure relief assembly ................9-2
1.2 Hydraulic cylinder .................................9-2
1.3 Control linkage.......................................9-2
2. OPERATING PRINCIPLE ............................9-3
2.1 Hydraulic circuit ....................................9-3
2.2 Hydraulic circuit diagram .....................9-4
2.3 Hydraulic pump......................................9-5
2.3.1 Location and structure of gear
pump ............................................9-5
2.3.2 Hydraulic pump specifications ..9-5
2.4 Oil filter...................................................9-6
2.4.1 Structure of oil filter....................9-6
2.4.2 Function and operation ..............9-6
2.5 Position control .....................................9-7
2.6 High pressure relief valve......................9-8
2.6.1 Relief valve set pressure ............9-8
2.7 Hydraulic cylinder .................................9-9
3. TROUBLESHOOTING ............................... 9-10
TABLE OF CONTENTS
4. SERVICING ................................................. 9-11
4.1 Location of hydraulic system components
.............................................................. 9-11
4.2 Hydraulic pump................................... 9-12
4.2.1 Disassembly of gear pump ..... 9-13
4.2.2 Installation ................................ 9-18
4.3 Hydraulic block................................... 9-21
4.3.1 Directional valve and cap ........ 9-22
4.3.2 Relief valve................................ 9-23
4.4 Position control valve ......................... 9-24
4.4.1 Removing control valve (with
hydraulic cylinder body removed
from tractor) ............................. 9-24
4.4.2 Adjusting spool joint 2 ............ 9-24
4.5 Hydraulic cylinder .............................. 9-25
4.5.1 Disassembling and assembling
.................................................. 9-25
4.6 Servicing .............................................. 9-26
4.6.1 Hydraulic cylinder bore (with
piston removed)........................ 9-26
4.6.2 Clearance between hydraulic arm
shaft and bushing .................... 9-26
4.6.3 Press-fitting bushing ............... 9-26
HYDRAULIC SYSTEM
Lk30_09_hydraulic.p65 2007-07-26, ¿ÀÈÄ 12:06Page 1 Adobe PageMaker 6.5K/Win
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