Case 120 - INTRODUCTION; Welcome Message

CONTENTS
MODEL 12 0 CRAWLER
SECTION 5 • THE HYDRAULIC SYSTEM
Description, Maintenance and Troubleshooting ........................................... 80 thru 127
Introduction
to Hydraulics .................................................................... 80
General Description and System Maintenance
........................................... 81 thru 89
Hydraulic Reservoir and Supercharge System
........................................... 82 thru 86
Hydraulic System Flushing and Troubleshooting
........................................ 87 thru 89
Main Hydraulic System
............................................................... 90 thru 100
Pilot Control System ................................................................. 101 thru 107
Auxiliary System
........................................................................ 107,108
Track Drive Circuit
................................................................... 108 thru 114
Tool Cylinder Circuit.
........................................................................ 115
Swing Circuit.
...................................................................... 116 thru 118
Crowd Cylinder Circuit.
.................................................................. 119,120
Hoist Cylinder Circuit (includes Fast Hoist Circuit) .................................... 120 thru 124
Pump Drive Clutch Circuit.
................................................................... 125
Counterweight System
................................................................... 126,127
Disassembly and Repair
................................................................ 128 thru 173
Hydraulic Reservoir
...................................................................... 128,129
Main Pumps
........................................................................ 129 thru 137
Main Control Valves
................................................................. 138 thru 140
Power Sensing Valve
........................................................................ 141
Hydraulic Filters (In-line) ..................................................................... 142
Charging Pump
...................................................................... 143 thru 145
Modulator Valves
.................................................................... 146thru 150
Swing Cushion Valve
........................................................................ 151
Swing Motors ....................................................................... 152 thru 156
Tool, Crowd and
Hoist Cylinders ...................................................... 157 thru 161
Fast Hoist Control Valve ..................................................................... 161
Track Drive Motors .. : . .............................................................. 162 thru 165
Hydraulic Swivel.
........................................................................ 166, 1-67
Counterweight Control Valve ............................................................. 168,169
Counterweight Cylinders
............................................................ 170 thru 172
Clutch Cylinder
.............................................................................. 173
TORQUE CHARTS AND SCHEMATICS . ...................................................... 174 thru 179
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