8 Hydraulics ................................................................8-1
8.1 Hydraulic schematic ................................................8-3
8.1.1 Hydraulic schematic ..............................................8-5
8.2 Specifications ......................................................8-7
8.2.1 Power shuttle transmission specifications .............................8-10
8.3 Transmission oil cooler and lubrication .............................8-11
8.4 General service procedures ........................................8-13
8.4.1 Transmission oil ................................................8-13
8.4.2 Checking the transmission oil level ...................................8-13
8.4.3 Changing the transmission oil and filter ...............................8-13
8.5 Suction filter ......................................................8-15
8.5.1 Suction filter specifications ........................................8-15
8.5.2 Suction filter operation ............................................8-16
8.5.3 Suction filter maintenance .........................................8-16
8.6 Gear pump .......................................................8-17
8.6.1 Main pump ....................................................8-17
8.6.2 Sub pump .....................................................8-18
8.7 Cylinders .........................................................8-19
8.7.1 Power steering cylinder ...........................................8-19
8.7.2 Main cylinder ..................................................8-21
8.7.3 Main cylinder specifications ........................................8-23
8.7.4 Assist cylinder, if equipped ........................................8-23
8.8 Valves ............................................................8-25
8.8.1 Main relief valve ................................................8-25
8.8.2 Installing the main relief valve ......................................8-26
8.8.3 Main relief valve specifications ......................................8-26
8.8.4 Main control valve ...............................................8-27
8.8.5 Steering orbit roll ................................................8-28
8.8.6 Slow return valve ...............................................8-29
8.8.7 Assembling precautions for the slow return valve ........................8-30
8.8.8 Slow return valve specifications .....................................8-30
8.8.9 Safety valve ...................................................8-31
8.8.10 Assembling precautions for the safety valve ...........................8-31
8.8.11 Safety valve specifications ........................................8-31
8.8.12 Power takeoff control valve .......................................8-32
8.8.13 Assembling precautions for the power takeoff control valve ................8-33
8.8.14 Power takeoff control valve specifications .............................8-33
8.8.15 Reduce valve .................................................8-34
8.8.16 Assembling precautions for the reduce valve ..........................8-36
8.8.17 Reduce valve specifications .......................................8-37
8.8.18 Control valve ..................................................8-37
8.8.19 Assembling precautions for the control valve ..........................8-41
8.8.20 Control valve specifications .......................................8-41
8.8.21 High-low valve (P1 type only) ......................................8-42
8.8.22 Joystick valve (J type only) ........................................8-44
8.8.23 Joystick valve specifications .......................................8-48
8.8.24 Boom valve operation ...........................................8-49
8.8.25 Bucket valve operation ..........................................8-54
8.8.26 Remote control valve ............................................8-57
8.8.27 Remote control valve specifications .................................8-57
8.8.28 Removing the remote control valve .................................8-58
8.8.29 Remote control valve assembly ....................................8-58
8.8.30 Installing the remote control valve ..................................8-59
8.9 Parts and hydraulic diagrams ......................................8-60
8.9.1 Front loader adapter .............................................8-60
Table of contents
4608 / 4609 / 4610 Service Manual
4283492M3
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