Branson F42r - Table of Contents

CHAPTER 6 HYDRAULIC SYSTEM
TABLE OF CONTENTS
1. CIRCUIT DIAGRAM FOR
HYDRAULIC SYSTEM ............................ 6-3
2. DIAGRAM FOR HYDRAULIC SYSTEM .. 6-5
3 . MAJOR COMPONENT SPECIFICATIONS .. 6-7
3.1 PST valve ..............................................6-7
3.2 Hydraulic pump ...................................... 6-7
3.3 Control valve ..........................................6-7
3.4 Front outlet valve ...................................6-8
3.5 Rear SCV valve .....................................6-8
3.6 PTO valve ..............................................6-8
3.7 HST [HST MODEL]................................6-8
3.8 Oil cooler [HST MODEL] .......................6-9
3.9 PST cylinder ..........................................6-9
3.10 Hydrauliclter .......................................6-9
3.11 HSTlter[HSTMODEL] ........................6-9
4. STRUCTURE AND OPERATION .......... 6-10
4.1 Steering valve ...................................... 6-10
4.1.1 Overview ........................................6-10
4.1.2 Internal structure and
operating principle .........................6-11
4.1.3
Examples of steering wheel operation ..6-13
4.2 PST cylinder ........................................ 6-16
4.3 Hydraulic pump .................................... 6-17
4.4 PTO valve ............................................ 6-18
4.5 Rear scv valve .....................................6-20
4.6
Front outlet valve assembly ...................6-22
4.7 Control valve ........................................6-24
4.7.1 Operationandoilow ................... 6-26
4.7.2 Control lever operation ................. 6-30
4.8 Hydraulic cylinder case assembly .......6-32
4.8.1 Hydraulic cylinder case ................. 6-32
4.8.2 Safety valve .................................. 6-33
4.8.3
Stop valve (also as slow return valve) .. 6-34
4.9 Hydrauliclterandstrainer ..................6-35
4.9.1 Hydrauliclter ............................... 6-35
4.9.2 HSTlter[HSTMODEL] ............... 6-36
4.10 HST(Hydrostatic Transmission)
[HST MODEL] ......................................6-37
4.10.1 HST passage composition ........... 6-37
4.10.2 Exterior dimension ........................ 6-38
4.10.3 Circuit diagram ............................. 6-39
4.10.4 HST pump..................................... 6-40
4.10.5 HST motor .................................... 6-40
4.10.6 Charge relief valve ........................ 6-41
4.10.7 Neutral valve ................................ 6-42
4.10.8 Main relief valve ............................ 6-45
4.10.9 HST pedal and link ....................... 6-46
4.11 Oil cooler [HST MODEL] .....................6-49
4.12 Position control ....................................6-49
4.13 Draft control .........................................6-50
5. TROUBLESHOOTING .......................... 6-51
6. SECTIONAL VIEW FOR
MAJOR COMPONENTS ....................... 6-52
6.1 Steering column ...................................6-52
6.2 P.S.T cylinder .......................................6-53
6.3 P.S.T pipe .............................................6-54
6.4 HYD pump ...........................................6-55
6.5 Case, HYD cylinder .............................6-56
6.6 Relief valve ..........................................6-57
6.7 Piston ass’y ..........................................6-59
6.8 Safty valve ...........................................6-60
6.9 Stop valve ............................................6-61
6.10 HYD control position type ....................6-62
6.11 Draft control .........................................6-64
6.12 HYD piping ..........................................6-65
6.13 HYDlter .............................................6-66
6.14 HYD pump [HST MODEL] ...................6-68
6.15 Oil cooler [HST MODEL] .....................6-69