McCormick Farmall MD MDV Tractor 1939 Operator's Manual OEM

• Covers the 1939 McCormick Farmall MD and MDV tractors, documenting operation, lubrication, and routine maintenance for both standard and variant-equipped units
• Contains 47 detailed illustrations covering controls, lubrication points, adjustment procedures, and special equipment installation
• 83-page PDF document
• This reprint remains the primary documentation for identifying original Farmall MD and MDV serial number prefixes and factory-specified lubrication intervals
• Features the Hydraulic Lift-All, Bosch injection pump, IH injection pump, H-4 magneto, Delco-Remy starting and lighting, power take-off, and belt pulley
• Covers the dual manifold starting carburetor, Diesel fuel water trap, adjustable wide front axle, variable-tread front wheels, swinging drawbar, radiator shutter, exhaust muffler, and spark arrester

Operational and Maintenance Coverage

This publication explains the routine adjustments and maintenance requirements necessary for the efficient operation and repair of the Farmall MD and Farmall MDV tractors. Providing a distinct diagnostic advantage for the daily workshop routine, the document details the unique Diesel starting cycle, which transitions from a carbureted gasoline cycle to Diesel operation via a compression release mechanism. Understanding this dual-fuel sequence allows mechanics to accurately test fuel delivery and avoid costly engine or fuel system damage. For DIYers and technicians looking to avoid an expensive trip to a diesel specialist, the manual outlines critical step-by-step procedures. These include venting air from the injection system, setting the injection pump timing, adjusting the engine valve clearance, equalizing the brakes, and timing the magneto.

Chapters provide descriptive guidance on the daily preparation of the tractor, including fuel system filling, cooling system inspections, and the cleaning of fuel strainers. Maintenance topics include the servicing of air cleaners, and the adjustment of the drawbar, brakes, and clutch. For a safe repair environment, always ensure the gearshift lever is in neutral and keep garage doors wide open to prevent carbon monoxide exposure before cranking the engine.

Technical Specification Preview

Engine identification and system settings are documented throughout the text. The operator's manual lists the governed full-load speed of the engine at 1450 RPM. Fluid capacities are explicitly stated; the transmission and differential case require 13 U.S. gallons, while the engine crankcase pan holds 9 U.S. quarts. Engine valve clearance is specified at 0.017 inches when the engine is warm. Specific fuel oil requirements, including gravity and viscosity grades for varying temperature ranges, are listed in a dedicated specifications table. Reference values for spark plug gaps (0.020 to 0.025 inches) are provided for starting system maintenance.

To easily trace circuits and isolate faults, the document is heavily supported by visual aids, featuring electrical equipment wiring diagrams, an H-4 magneto wiring chart, a comprehensive troubleshooting chart, engine and chassis lubrication charts, a cutaway view of the oil filter, and an exploded view of the air cleaner. This 83-page manual serves as the factory-authorized reference for 1939 Farmall MD and MDV owners, documenting all engine, chassis, and electrical system specifications required for operating the tractor as intended (an official OEM part number is not designated on this edition).