John Deere 2120 Tractor Technical Manual (TM4252)

John Deere 2120 Tractor Technical Manual (TM4252 01Dec70)

This factory-issued technical manual provides complete diagnostic, servicing, and repair instructions for John Deere 2120 Tractors. It includes specifications, inspection procedures, lubrication and service data, and detailed coverage of the engine, fuel system, electrical circuits, powertrain, hydraulics, steering, brakes, and attachments. Designed for professional service, the manual contains troubleshooting guides, adjustment routines, and step-by-step disassembly and assembly instructions for precise maintenance.

Model Covers:

John Deere 2120 Tractor

Serial No. 61020 L-up

File Format: PDF

Size: 21.36 MB

No. of pages: 354

Language: English

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

📑 Included Sections:

General Information

• Specifications, torque data, and capacities
• Pre-delivery, delivery, and after-sales inspections
• Lubrication and periodic service intervals
• Tune-up and adjustment routines

Engine

• Diagnosis of malfunctions and service specifications
• Repair of cylinder head, camshaft, balancer shafts, and timing gear train
• Servicing pistons, liners, crankshaft, bearings, flywheel, and lubrication system
• Cooling system and speed control servicing

Fuel System

• Fuel tank, transfer pump, and filter service
• ROTO-DIESEL injection pump maintenance
• ROOSA-MASTER injection nozzle servicing
• Cold weather starting aids diagnostics

Electrical System

• Wiring diagrams and component locations
• Diagnosis and testing of circuits and components

Power Train

• Engine clutch and linkage servicing
• HIGH-LOW shift unit and transmission disassembly and adjustment
• Differential, final drives, and PTO shaft servicing

Front Axle, Steering, and Brakes

• Front axle repair and inspection
• Steering system adjustment and servicing
• Brake troubleshooting and repair

Hydraulic System

• General hydraulic diagnostics and pressure testing
• Servicing of reservoir, filters, valves, and oil cooler
• Pump and rockshaft adjustments
• Selective control valves and remote cylinder repair

Miscellaneous

• Belt pulley, deluxe seat, and wheel servicing
• Hydraulic hitch and roll guard repairs

This John Deere Tractor Technical Manual provides professional-level servicing instructions, adjustment data, and diagnostic procedures to maintain and restore the John Deere 2120 Tractor to peak operating condition.