CASE 120 Crawler Service Manual

CASE 120 Crawler Service Manual – S406208M2

This comprehensive factory service manual delivers detailed repair, maintenance, and diagnostic procedures for the CASE 120 Crawler. It includes complete instructions for scheduled maintenance, undercarriage systems, upperstructure components, electrical circuits, and full hydraulic architecture. Designed for professional technicians, this guide ensures proper servicing of all major systems using manufacturer standards.

Model Covers:

CASE 120 Crawler Excavator

File Format: PDF

Size: 29.86 MB

No. of pages: 188

Language: English

Publication: S406208M2

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

General Information

• Safety procedures, warning labels, operator hazards, and compliance requirements
• Machine overview, nomenclature, component reference, and directional orientation
• Parts ordering references and general service protocols

Scheduled Preventive Maintenance

• Approved lubricants, fluid types, and detailed capacity charts
• Pressure settings for hydraulic and mechanical systems
• Maintenance intervals, visual service chart, and pictorial lube point diagrams

Undercarriage

• Component layout and operational theory of track assemblies
• Upper and lower track rollers, idlers, sprockets, and tensioning systems
• Track drive transmission unit: disassembly, cleaning, and overhaul procedures
• Turntable bearing servicing and carbody structure maintenance

Upperstructure

• Pump drive transmission, clutch mechanism and power input systems
• Swing system components including planetary gearbox and slew motors
• Boom assembly construction, pivot joint maintenance, and full removal process
• House brake systems and swing bearing replacement guidelines

Electrical System

• Charging system diagnostics including alternator and battery output verification
• Control circuit schematics, wiring harness routing, and electrical protection logic
• Lighting system, instrument panel functions, and fuse/relay configuration

Hydraulic System

• Introduction to hydraulic logic, component flow paths, and filtration strategy
• Main pump system: variable displacement control, pressure regulation, and flow tuning
• Pilot-operated valves and control circuits for tool, swing, hoist, and crowd operations
• Hydraulic swivel servicing, auxiliary lines, track drive circuits, and fast hoist logic
• Modulator valves, power-sensing units, swing cushioning, and counterweight control
• Reservoir servicing, supercharge system pressure management, and fluid flushing

Disassembly & Repair Procedures

• Detailed teardown steps for hydraulic pumps, motor units, swing gearbox, and main valves
• Track drive motor component inspection and reassembly techniques
• Hydraulic cylinders (tool, hoist, crowd) rod and seal maintenance procedures
• Counterweight actuator system including valves and double-acting cylinders
• Clutch cylinder breakdown, diagnostics, and performance testing

Torque Charts and Schematics

• Factory torque specifications for all major assemblies and service interfaces
• Hydraulic schematics showing circuit flow logic and pressure reference points
• Electrical diagrams for troubleshooting faults and sensor pathway isolation

This CASE 120 Crawler Service Manual is an essential resource for trained technicians responsible for advanced diagnostics, troubleshooting, and mechanical restoration of crawler components and hydraulic subsystems.