Case IH 3388, 3588, 3788, 6388, 6588 & 6788 Tractor Chassis International Pdf Service Repair Manual

Case IH 3388, 3588, 3788, 6388, 6588 & 6788 Tractor Chassis International PDF Repair Service Manual

The Case IH 3388, 3588, 3788, 6388, 6588 & 6788 Tractor Chassis International PDF Repair Service Manual is an OEM factory workshop manual dedicated to one of the most distinctive tractor designs ever built by International Harvester—the legendary 2+2 articulated tractor. Unlike conventional four-wheel-drive tractors, the 2+2 series placed the engine ahead of an articulated center section while the transmission, cab and rear axle remained on the rear chassis. This unique layout combined the maneuverability of a row-crop tractor with the traction benefits of articulated four-wheel drive, making these machines highly effective for cultivation, planting, tillage and heavy PTO applications. Production evolved from the original 3388, 3588 and 3788 models into the improved 6388, 6588 and 6788 series, featuring refinements in driveline durability and operator comfort.

This workshop manual concentrates on the complete tractor chassis, providing dealership-level procedures for diagnosing articulation components, steering hydraulics, transmission systems, axles, brakes, hydraulic circuits, PTO assemblies and electrical systems. Instead of relying on generic repair advice, technicians can follow factory inspection limits, adjustment specifications and overhaul procedures that help restore the tractor's original performance after years of demanding agricultural work.

2+2 Tractor Technical Overview

Why The 2+2 Chassis Requires Specialized Repairs

The articulated center section is the defining feature of these tractors and is subjected to constant torsional loads during field operation. Components such as articulation pins, pivot bushings, steering cylinders and universal driveline joints require periodic inspection to maintain steering precision and drivetrain alignment. The chassis also integrates high-capacity hydraulic circuits and a heavy rear transmission that must be serviced using factory adjustment procedures to ensure reliable power transfer under heavy draft loads. The later 6388, 6588 and 6788 models incorporated updates that improved overall durability while preserving the unique 2+2 concept.

Workshop Systems Covered

Typical Chassis Repairs Explained

• Inspecting articulation pivot wear before replacing steering components.
• Checking driveline alignment after center-frame servicing.
• Testing hydraulic pressure when three-point hitch response becomes slow.
• Rebuilding transmission assemblies after heavy tillage operation.
• Diagnosing PTO clutch slippage while operating large implements.
• Measuring differential backlash during axle overhaul.
• Tracing charging system faults using factory electrical schematics.
• Servicing steering cylinders to eliminate uneven articulation movement.
• Adjusting brake components following hydraulic repairs.
• Completing operational inspections before returning the tractor to field work.

Manual Specifications

Frequently Asked Questions

Does this manual cover both the early and later 2+2 tractors?

Yes. It includes chassis repair information for the 3388, 3588, 3788, 6388, 6588 and 6788 International 2+2 tractor models.

Is articulation steering repair included?

Yes. The manual explains center pivot servicing, articulation steering diagnostics, steering cylinder repairs and related hydraulic adjustments.

Can this manual be used for complete transmission rebuilding?

Yes. It contains factory overhaul procedures, inspection specifications, adjustment values and transmission troubleshooting methods.

Are hydraulic diagnostics and wiring diagrams provided?

Yes. Hydraulic pressure testing, troubleshooting charts, OEM wiring diagrams and electrical diagnostic procedures are included.

Is this a chassis-only workshop manual?

Yes. This publication focuses on the tractor chassis and related mechanical systems, making it ideal for professional repairs, restoration projects and dealership-level servicing.