Target Audience:
Owners, mechanics, technicians, and restoration enthusiasts of the IH 1256 tractor.
Value Proposition:
Essential resource for maintaining, repairing, and maximizing the lifespan and performance of the IH 1256.
Completeness Vs Alternatives:
Provides a comprehensive alternative to potentially incomplete or outdated physical manuals, with the convenience of digital access.
Accessibility:
Instant download allows immediate access to critical service information.
Searchability:
Enables quick lookup of specific procedures, parts, or troubleshooting steps.
General Coverage:
All aspects of service, maintenance, and troubleshooting for the IH International Harvester 1256 Tractor.
Estimated Page Count:
Varies by specific edition, but typically extensive for full workshop manuals (e.g., 500+ pages).
Type:
Workshop Repair Service Manual
Engine:
Detailed disassembly, assembly, testing, and repair procedures for the International Harvester DT361 and DT407 diesel engines.
Transmission:
Coverage of the International Harvester Power Transfer (PT) and power shift transmissions, including overhaul and adjustment.
Hydraulic System:
Maintenance, repair, and troubleshooting of the tractor's hydraulic pump, valves, cylinders, and control systems.
Steering System:
Service and repair for both hydrostatic and mechanical steering components.
Brake System:
Detailed procedures for servicing and repairing the wet disc brake system.
Electrical System:
Wiring diagrams, component testing, troubleshooting for starting, charging, lighting, and instrument systems.
Cooling System:
Maintenance, repair, and testing of the radiator, thermostat, water pump, and fan.
Fuel System:
Service and adjustment of the fuel injection pump and injectors.
Power Take Off (Pto):
Repair and maintenance of the independent PTO and drive systems.
Hitch System:
Service procedures for the three-point hitch, including draft control and position control.
Operator Station:
Maintenance of cab, controls, seat, and instrumentation.
Scheduled Maintenance:
Comprehensive guide to routine service intervals and tasks.
Troubleshooting:
Diagnostic charts and step-by-step procedures for identifying and resolving common and uncommon issues.
Disassembly And Assembly:
Detailed instructions for taking apart and reassembling all major tractor components and systems.
Calibration And Adjustment:
Procedures for calibrating and adjusting engine, transmission, hydraulic, and PTO systems.
Component Testing:
Methods for testing the performance and condition of individual components like fuel injectors, pumps, and electrical parts.
Overhaul:
Complete overhaul instructions for engines, transmissions, and hydraulic pumps.
Diagnostic Capability:
Advanced diagnostic procedures, including pressure testing, flow testing, and electrical circuit analysis.
Repair Complexity:
Covers everything from basic adjustments and fluid changes to complete engine and transmission rebuilds.
Specifications Accuracy:
Provides precise torque values, clearances, fluid capacities, and performance specifications.
Engine Model Options:
International Harvester DT361 (361 cubic inch) and DT407 (407 cubic inch) naturally aspirated or turbocharged diesel engines.
Dt361 Horsepower:
Approximately 70-80 PTO horsepower (varies by specific configuration and turbocharging).
Dt407 Horsepower:
Approximately 85-100 PTO horsepower (varies by specific configuration and turbocharging).
Engine Type:
Direct Injection, 4-stroke Diesel
Injection Pump:
Roosamaster or similar Bosch-type inline or rotary injection pumps.
Fuel Filter Part Number Example:
Refer to manual for specific OEM or aftermarket filter numbers (e.g., Wix 33157, Fleetguard FS1240).
Oil Capacity Quarts:
Approximately 12 quarts (11.4 liters) with filter, depending on engine variation.
Recommended Oil Viscosity:
API CD or CE, SAE 15W-40 for most operating temperatures (refer to manual for specific recommendations).
Coolant Capacity Gallons:
Approximately 20-25 gallons (75-95 liters) including engine block and radiator, depending on configuration.
Coolant Type:
Conventional Green Ethylene Glycol based coolant (50/50 mix with distilled water recommended).
Transmission Type:
International Harvester's 7-speed synchronized constant mesh or 8-speed Power Transfer (PT) / Power Shift transmission.
Optional Transmission:
Synchronized manual transmission was standard on many models, with the Power Transfer (Powershift) an option for increased operational flexibility.
Powershift Speeds:
Typically 8 forward and 8 reverse speeds via a torque converter and planetary gear sets.
Transmission Fluid Type:
IH Hy-Tran, UTF (Universal Tractor Transmission Fluid), or equivalent approved fluid (refer to manual for specific part numbers and specifications).
Transmission Fluid Capacity Quarts:
Approximately 17-20 quarts (16-19 liters) for the transmission and hydraulic system combined (check manual for exact capacity).
Wheelbase Inches:
Approximately 94 inches (2388 mm).
Length Inches:
Approximately 150 inches (3810 mm).
Height To Top Of Exhaust Inches:
Approximately 95 inches (2413 mm).
Operating Weight Lbs:
Approximately 7,000-8,500 lbs (3175-3856 kg) depending on configuration and options.
Drawbar Pull Capacity Lbs:
Significant, designed for heavy draft work. Specific values depend on tractor weight and tire traction.
Engine Oil Change Interval Hours:
Typically every 200-250 operating hours (refer to manual for exact recommended interval).
Fuel Filter Replacement Interval:
Every 250-500 operating hours or annually, whichever comes first.
Air Filter Service:
Check daily, service as needed based on operating conditions (e.g., every 50-100 hours).
Hydraulic Fluid Change Interval:
Typically every 500-1000 operating hours or annually.
Engine Oil Spec:
API CD or CE, SAE 15W-40 Diesel Engine Oil.
Hydraulic Transmission Fluid Spec:
IH Hy-Tran, UTF, or equivalent meeting IH specifications for their transmission and hydraulic systems.
Coolant Spec:
50/50 mix of permanent type antifreeze (ethylene glycol based) and clean, soft water. Recommended to use a coolant with heavy-duty diesel engine protection additives.
Common Wear Points:
Clutch wear, PTO engagement issues, hydraulic pump wear, and injection pump timing drift can be common maintenance items.
Engine Longevity Factors:
Proper maintenance, clean fuel and oil, and avoiding overheating are crucial for the longevity of the DT-series engines.
