Drott 120, 120C Crawler Excavator Service Manual S406208M2 English
Brand: CASE Construction / Drott
Product Range: Crawler Excavator
Publication Type: Service Manual
Equipment Model: 120, 120C Crawler Excavator
Serial Number: -
Publication Number: S406208M2
Issued: Printed in U.S.A.
Language: English
Pages: 188
File Format: PDF Document
Additional Information: All components and systems are covered, with the exception of the engine which is covered in the engine manufacturer's manual. For Engine Repair, See the Engine Service Manual.
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
GENERAL
Safety Precautions
Introduction
Nomenclature and Machine General Description
Directional Reference
Parts and Service
SECTION 1 - SCHEDULED PREVENTIVE MAINTENANCE
Lubricant and Fluid Recommendations
Component Capacities
Pressure Settings
Maintenance Schedule
Service Chart
Pictorial Listing of Grease Fitting Locations
SECTION 2 - THE UNDERCARRIAGE
Description, Maintenance and Troubleshooting
Carbody and Turntable Bearing
Track Assemblies
Track Drive Assemblies
Disassembly and Repair
General Cleaning Instructions
Upper Track Rollers
Lower Track Rollers
Idler Wheel Assembly
Digging Brake
Track Drive Transmission
SECTION 3 - THE UPPERSTRUCTURE
Description, Maintenance and Troubleshooting
Pump Drive System
Swing System
Boom Assembly
Disassembly and Repair
Pump Drive Transmission and Clutch
House Brakes
Swing Gearbox
Turntable Bearing Replacement
Boom Removal
SECTION 4 - THE ELECTRICAL SYSTEM
Description, Maintenance and Troubleshooting
The Charging System
Control Circuits
Lights and Instrument Circuits
Disassembly and Repair
SECTION 5 - THE HYDRAULIC SYSTEM
Description, Maintenance and Troubleshooting
Introduction to Hydraulics
General Description and System Maintenance
Hydraulic Reservoir and Supercharge System
Hydraulic System Flushing and Troubleshooting
Main Hydraulic System
Pilot Control System
Auxiliary System
Track Drive Circuit
Tool Cylinder Circuit
Swing Circuit
Crowd Cylinder Circuit
Hoist Cylinder Circuit (includes Fast Hoist Circuit)
Pump Drive Clutch Circuit
Counterweight System
Disassembly and Repair
Hydraulic Reservoir
Main Pumps
Main Control Valves
Power Sensing Valve
Hydraulic Filters (In-line)
Charging Pump
Modulator Valves
Swing Cushion Valve
Swing Motors
Tool, Crowd and Hoist Cylinders
Fast Hoist Control Valve
Track Drive Motors
Hydraulic Swivel
Counterweight Control Valve
Counterweight Cylinders
Clutch Cylinder
TORQUE CHARTS AND SCHEMATICS