SkyTrak 6042 Service Manual - Manual (Page 233)

8.1 Model 6042 Legacy Origin 7/02
Section 8
Hydraulic System
Contents
PARAGRAPH TITLE PAGE
8.1 Hydraulic Component Terminology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3
8.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.4
8.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5
8.4 Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5
8.5 Hoses, Tube Lines, Fittings, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.6
8.5.1 Replacement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.6
8.5.2 Hose, Tube, Line and Fitting Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . 8.6
8.6 Hydraulic Pressure Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.7
8.6.1 Pressure Checks and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.8
8.7 Hydraulic System Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10
8.7.1 6042 Hydraulic Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10
8.8 Hydraulic Circuits and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.13
8.8.1 Brake Circuit and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.14
8.8.2 Boom Extend Circuit and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.16
8.8.3 Boom Retract Circuit and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.18
8.8.4 Boom Lift Circuit and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20
8.8.5 Boom Lower Circuit and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.22
8.8.6 Frame Sway (Left) and Stabilizer Circuit and Troubleshooting . . . . . . . . . . . . 8.24
8.8.7 Frame Sway (Right) and Stabilizer Circuit and Troubleshooting. . . . . . . . . . . 8.26
8.8.8 Attachment Tilt (Down) and Slave Cylinder Circuit and Troubleshooting . . . . 8.28
8.8.9 Attachment Tilt (Up) and Slave Cylinder Circuit and Troubleshooting . . . . . . 8.30
8.8.10 Pump, Unloader Valve and Cooling Circuit and Troubleshooting . . . . . . . . . . 8.32
8.8.11 Auxiliary Hydraulics Circuit and Troubleshooting (Male Coupler Pressurized) . . . . 8.34
8.8.12 Auxiliary Hydraulics Circuit and Troubleshooting (Female Coupler Pressurized) . . . 8.36
8.8.13 Front-Wheel Steering Circuit (Left Turn) and Troubleshooting . . . . . . . . . . . . 8.38
8.8.14 Front-Wheel Steering Circuit (Right Turn) and Troubleshooting . . . . . . . . . . . 8.40
8.8.15 Four-Wheel Steering Circuit (Left Turn) and Troubleshooting . . . . . . . . . . . . 8.42
8.8.16 Four-Wheel Steering Circuit (Right Turn) and Troubleshooting . . . . . . . . . . . 8.44
8.8.17 Crab Steering Circuit (Left) and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 8.46
8.8.18 Crab Steering Circuit (Right) and Troubleshooting . . . . . . . . . . . . . . . . . . . . . 8.48
8.8.19 Brake Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.50
8.8.20 Boom Extend/Retract Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.52
8.8.21 Boom Lift/Lower Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.52
8.8.22 Frame Sway and Stabilizer Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . 8.53
8.8.23 Attachment Tilt and Slave Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . 8.54
8.8.24 Pump, Unloader Valve and Cooling Circuit Description . . . . . . . . . . . . . . . . . 8.54
8.8.25 Auxiliary Hydraulics Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.54
8.8.26 Steering Circuit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.55