Case 120 Crawler Service Manual S406208M2 – PDF DOWNLOAD
DESCRIPTION:
Case 120 Crawler Service Manual S406208M2 – PDF DOWNLOAD
INTRODUCTION :
This manual is designed to serve as a guide in maintaining and servicing the
120 CRAWLER. All components and systems are covered, with the
exception of the engine which is covered in the engine manufacturer’s
manual.
The book is basically divided into five sections, preceded by a general section
on safety. nomenclature and Parts & Service information.
Section 1 gives the Scheduled Preventive Maintenance needed to keep the
machine in top operating condition. It includes a maintenance schedule,
component capacities, service chart, lubricant and fluid recommendations,
and a pictorial listing of all grease fitting locations. If more detailed
maintenance information is required, it can be found in the individual service
sections.
Section 2 covers the undercarriage. It includes the turntable bearing, the
tracks and the track drives.
Section 3 covers the mechanical components of the upperstructure. Included
are the engine, pump drive transmission, the swing assemblies and the boom
assembly.
Section 4 covers the Electrical System. It is divided into the charging system,
lights and instrument circuits, and the control circuits.
Section 5 covers the Hydraulic System. It includes the main system, the pilot
control system, the counterweight system, the supercharge system, and the
auxiliary hydraulic system.
- The sections are divided into two subdivisions. The first part covers
description, maintenance and troubleshooting. The second part covers
disassembly and repair. - Torque Charts and Schematics of the hydraulic and electrical systems are
located in back of this manual. These should be used as aids in
troubleshooting.
TABLE OF CONTENTS:
Case 120 Crawler Service Manual S406208M2 – PDF DOWNLOAD
GENERAL
Safety Precautions ………………………………………………………………….. 3,4
Introduction …………………………………………………………………………. 5
Nomenclature and Machine General Description …………………………………………. 6,7
Directional Reference …………………………………………………………………. 8
Parts and Service …………………………………………………………………….. 8
SECTION 1 • SCHEDULED PREVENTIVE MAINTENANCE
Lubricant and Fluid Recommendations …………………………………………………… 9
Component Capacities ……………………………………………………………….. 10
Pressure Settings ……………………………………………………………………. 1 0
Maintenance Schedule ……………………………………………………………….. 11
Service Chart …………………………………………………………………….. 12, 13
Pictorial Listing of Grease Fitting Locations …………………………………………… 14, 15
SECTION 2 • THE UNDERCARRIAGE
Description, Maintenance and Troubleshooting …………………………………….. 16 thru 26
Carbody and Turntable Bearing ………………………………………………………. 17
Track Assemblies ……………………………………………………………. 18 thru 22
Track Drive Assemblies ………………………………………………………. 22 thru 26
Disassembly and Repair ………………………………………………………… 27 thru 42
General Cleaning Instructions ……………………………………………………….. 27
Upper Track Rollers ……………………………………………………………… 28,29
Lower Track Rollers ……………………………………………………………… 30,31
Idler Wheel Assembly ………………………………………………………… 31 thru 33
Digging Brake …………………………………………………………………. 34-35B
Track Drive Transmission …………………………………………………….. 36 thru 42
SECTION 3 • THE UPPERSTRUCTURE
Description, Maintenance and Troubleshooting …………………………………….. 43 thru 54
Pump Drive System ………………………………………………………….. 43 thru 48
Swing System ………………………………………………………………. 49 thru 53
Boom Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ………. 54
Disassembly and Repair . ……………………………………………………….. 55 thru 67
Pump Drive Transmission and Clutch …………………………………………… 56 thru 59
House Brakes …………………………………………………………………….. 59
Swing Gearbox ……………………………………………………………… 59 thru 65
Turntable Bearing Replacement ……………………………………………….. 65 thru 67
Boom Removal ………………………………………………….•……………….. 67
SECTION 4 • THE ELECTRICAL SYSTEM
Description, Maintenance and Troubleshooting …………•..•.•………….••….•…..• 68 thru 79
The Charging System ………………………………………………………… 69 thru 74
Control Circuits .•……..•……………………………………….•…•…•..•.. 74 thru 77
Lights and Instrument Circuits …………………………………..•…………………. 78
Disassembly and Repair . ……………………………………………………………… 79
1
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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