🏷️ Basic Information

Make:

Case IH

Model:

STX Series Tractors

Sub Models Covered:

STX275, STX325, STX375, STX425, STX450

Serial Number Prefix Coverage:

Prior to P.I.N. JEE102001

👋 Introduction

Class:

High-horsepower articulated agricultural tractors

Competitors:

John Deere 8000 Series, New Holland TJ Series, Challenger MT Series

Power Range:

275-450 HP, offering significant pulling power and versatility

Articulation:

Articulated steering for enhanced maneuverability in the field

Transmission Options:

Powershift transmissions (PS-3, 16-speed, 24-speed) for efficient power delivery

Quadtrac Option:

Availability of Quadtrac (tracked) variants for superior traction and reduced soil compaction

Benefit:

Enables users to diagnose and repair their machine without relying solely on external service centers.

📋 Manual Details

Primary Coverage:

Service, Repair, Maintenance, Troubleshooting

Total Pages:

3636

Type:

Service Shop Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Engine removal/installation, air induction system, viscous/hydraulic fan drive testing (Note: Detailed engine overhaul requires separate Engine Service Manual)

Fuel:

Fuel system components and service (specific details not itemized in provided excerpt, but coverage implied)

Electrical:

System operation, troubleshooting (pre/post P.I.N. JEE00099501), starter motor (Nippondenso/Delco Remy), battery service, alternator (Bosch), electrical schematics (Powershift/Manual Shift Transmission)

Steering:

Control valve, steering column, pedals, switches, cylinders, Accusteer system (operation, calibration, troubleshooting), steering cylinders with linear potentiometers

Powertrain:

PS-3 Powershift transmission (removal/installation, pressure testing, troubleshooting), 16-speed Powershift transmission (disassembly/assembly), PTO clutch, PTO drive unit, PTO transfer case, PTO dropbox, rear drive line, carrier bearings, front/rear axles (wheel and Quadtrac configurations), undercarriage (Quadtrac), range selector, pressure regulator valve, 24-speed transmission

Brakes:

Brake system operation, service brake valve (removal/repair)

Chassis:

A/C system (troubleshooting, component service), radiator/coolers/condenser, cab removal/installation, hood removal/installation, hitch cylinders, center hinge bearings, deluxe air seat, drawbar, front frame hinge

Controller Systems:

Standard instrumentation, hitch controller, transmission controller, armrest controller, remote hydraulics controller, steering controller, performance monitor controller, AUX67 controller (programming, calibration, fault codes)

Maintenance:

Routine maintenance checks, fluid level checks, lubrication (implied by Loctite chart and torque specs)

Repair:

Step-by-step repair instructions for all covered systems, component disassembly and assembly, troubleshooting and correction of faults

Troubleshooting:

Diagnostic procedures for electrical, transmission, steering, and controller systems; fault code interpretation

Installation:

Component removal and installation, system installation procedures

Depth:

Comprehensive shop-level repair and diagnostics, including detailed diagrams, illustrations, and schematics

📊 Manual Specifications

Format:

PDF

Size Mb:

348

Quality Description:

Contains diagrams, actual real photo illustrations, and schemes

Type:

Digital Download (PDF)

Type:

N/A (Digital)

Feature:

Searchable text within PDF for quick information retrieval

Feature:

Printable pages for on-site use

⚙️ Engine Specifications

Manufacturer:

Cummins (commonly used in this era of Case IH tractors for high HP applications)

Engine Displacement Range:

Likely 8.3L or 10.8L Cummins QSB/QSX series based on HP rating

Horsepower Range:

275 HP (STX275) to 450 HP (STX450)

Injection Type:

Common Rail Diesel Injection (expected for the era and HP)

🔧 Transmission

Type Stx275 Stx325:

PS-3 Powershift Transmission

Type Stx375 Stx450:

16-Speed or 24-Speed Powershift Transmission (depending on specific model and P.I.N.)

Configuration Options:

Quadtrac (tracked version) which integrates with specific powertrain configurations.

Powershift Operation:

Automated gear changes under load, providing smooth power delivery

Pto Options:

Standard PTO clutch and drive unit service

📐 Dimensions

Base Weight Estimation:

Exceeds 20,000 lbs (9,072 kg), varies significantly by configuration (wheel vs. Quadtrac)

Max Operating Weight:

Can exceed 30,000 lbs (13,608 kg) with ballast and implements

🛡️ Safety Features

Rollover Protection:

ROPS (Roll-Over Protective Structure) as standard

Braking System:

Hydraulic service brakes, parking brake

Cab Features:

Operator comfort and safety features within the cab, including seatbelt

💡 Technology Features

Features:

Basic cab instrumentation for monitoring engine and transmission parameters. Advanced features would be limited to control interfaces.

Autosteer Integration:

The 'Accusteer' system points to advanced steering capabilities, likely an precursor or integrated component for autosteer systems.

Controller Systems:

Extensive use of electronic controllers for transmission, hitch, steering, and engine management, with detailed diagnostic procedures provided.

Service Tool Mention:

Reference to 'Electronic Service Tool Users Manual' and 'AUX67 Controller' indicates the use of specialized diagnostic equipment for advanced troubleshooting.

🔧 Maintenance

Engine Oil Change:

Typically 250-500 hours, depending on operating conditions (refer to specific engine manual or manual section for precise intervals)

Transmission Fluid Change:

Typically 1000-2000 hours, depending on transmission type and load (refer to manual for specifics)

Engine Oil:

API CI-4 or CH-4 rated diesel engine oil, SAE 15W-40 recommended (verify with manual for exact specification)

Transmission Hydraulic Fluid:

Case IH Hy-Tran Ultra or equivalent (verify with manual for exact specification and capacity)

Common Failures:

Transmission control module issues, electronic sensor failures, hydraulic pump wear, exhaust gas recirculation (EGR) system issues (common on Tier 3 engines of this era)

Diagnostics Focus:

Electrical system troubleshooting and controller calibration are critical for resolving operational problems.

Torque Specifications:

Provided in a dedicated section, essential for proper assembly and preventing component failure.

Loctite Chart:

Includes guidance on the appropriate Loctite products for various fasteners and thread-locking applications.

📚 Vehicle History

Legacy:

Case IH is a major manufacturer of agricultural equipment with a long history of innovation and powerful tractors.

Series Introduction:

The STX series represented Case IH's high-horsepower, articulated tractor line, succeeding earlier models and competing in the premium large tractor segment.

Production Era:

The models covered (STX275-STX450) were primarily produced in the early to mid-2000s.

🏆 Awards & Recognition

Industry Standing:

Case IH tractors of this era were well-regarded for their power, durability, and innovation in the high-horsepower segment.

Performance:

High performance ratings for heavy tillage, planting, and large-area cultivation.