Target User:
Tractor owners, mechanics, repair shops, and hobbyists seeking to maintain or repair their Allis-Chalmers D12 tractor.
Value Proposition:
Enables users to perform their own repairs, saving significant costs on labor and potentially extending the life of the tractor.
Advantage:
Comprehensive, easy-to-follow, step-by-step instructions with visual aids (pictures and wiring diagrams) for efficient repair.
Feature List:
Detailed repair procedures, routine maintenance schedules, troubleshooting guides, comprehensive wiring diagrams, printable format.
Engine Systems:
Engine overhaul, fuel system, lubrication system, cooling system, ignition system (if applicable), starting system, exhaust system, air intake system.
Transmission Systems:
Gearbox, clutch, PTO (Power Take-Off) operation and maintenance, final drives, differential.
Hydraulic Systems:
Hydraulic pump, control valve, cylinders, hydraulic fluid specifications, troubleshooting, and repair of the hydraulic lift system.
Electrical Systems:
Wiring diagrams, battery, starter, generator/alternator, lighting, instrument panel, troubleshooting of electrical faults.
Chassis And Running Gear:
Steering system, front axle, rear axle, brakes, wheels, tires, hitch mechanism.
Operator Station And Bodywork:
Fenders, seat, controls, dashboard, general maintenance of the tractor's body.
Paint And Cosmetics:
While not a primary focus, general care and maintenance of the exterior paint (Allis-Chalmers Orange) might be implicitly covered in bodywork sections.
Routine Maintenance:
Lubrication schedule, fluid level checks and changes, filter replacement, greasing points, tire pressure.
Repair And Overhaul:
Step-by-step instructions for dismantling, inspecting, repairing, and reassembling all major components and systems.
Troubleshooting:
Diagnostic procedures, symptom analysis, and corrective actions for common and uncommon problems across all systems.
Technical Specifications:
Detailed specifications for all components, including tolerances, clearances, torque values, and fluid capacities.
Wiring Diagrams:
Comprehensive electrical schematics for accurate fault diagnosis and component identification.
Component Rebuilds:
Detailed procedures for rebuilding the engine, transmission, hydraulic pump, and final drives.
Depth Of Coverage:
In-depth, professional quality, covering all areas of repair from routine maintenance to complete component overhaul.
Diagrams Illustrations:
Includes exploded views, diagrams, and photographs to aid in identification and assembly.
Engine Make Model:
Allis-Chalmers Model '149' (Gasoline/LPG) or '152' (Diesel)
Bore Stroke Gas:
3.50 in x 4.25 in (89 mm x 108 mm)
Displacement Gas:
149 cubic inches (2.45 Liters)
Bore Stroke Diesel:
3.63 in x 4.37 in (92 mm x 111 mm)
Displacement Diesel:
152 cubic inches (2.5 Liters)
Horsepower Gas Approx:
Approx. 40 PTO HP
Horsepower Diesel Approx:
Approx. 42 PTO HP
Fuel Type:
Gasoline or LPG (Liquid Petroleum Gas) / Diesel
Carburetor Gas:
Zenith or Marvel-Schebler (specific model varies)
Fuel Injection Diesel:
Roosamaster or similar injection pump
Governor Type:
Mechanical governor for engine speed regulation.
Oil Type Specification:
Refer to manual for specific viscosity grade (e.g., SAE 30, 10W-30) and API service classification (e.g., CD for diesel).
Cooling Method:
Water-cooled, thermostatically controlled.
Transmission Type:
Constant mesh, sliding gear type.
Gear Speeds:
8 forward speeds, 2 reverse speeds.
Pto:
Independent PTO (540 RPM standard).
Differential Lock:
Standard (foot operated).
Transmission Oil Type:
Refer to manual for specific tractor hydraulic fluid (e.g., TDH, Hy-Trans) or gear oil specification.
Length Approx:
Approx. 125 inches (3175 mm)
Width Approx:
Approx. 65 inches (1651 mm)
Height To Top Of Steering Wheel Approx:
Approx. 55 inches (1397 mm)
Shipping Weight Gas Approx:
Approx. 3,400 lbs (1542 kg)
Shipping Weight Diesel Approx:
Approx. 3,550 lbs (1610 kg)
Operating Weight Approx:
Approx. 3,700-4,000 lbs (1678-1814 kg) depending on configuration.
Front Tire Size Typical:
e.g., 5.50-16 or 6.00-16
Rear Tire Size Typical:
e.g., 12.4-24 or 13.6-24
Engine Oil Change:
Refer to manual for specific hours, typically every 50-100 hours of operation, depending on load and conditions.
Air Filter Service:
Check and clean/replace based on operating environment, usually before heavy use or when indicated by vacuum gauge.
Fuel Filter Replacement:
Regular replacement as per manual, especially before seasonal storage or if experiencing fuel system issues.
Hydraulic Oil Capacity:
Refer to manual for exact capacity, typically around 5-7 gallons for the integrated hydraulic system.
Coolant Type:
Ethylene Glycol based antifreeze mixed with distilled water (50/50 ratio recommended).
Common Wear Items:
Clutch friction plate, brake linings, hydraulic pump seals, carburetor wear, PTO clutch pack.
Engine Performance Issues:
Carburetor maladjustment, clogged fuel filters, worn piston rings, valve seating issues.
Hydraulic System Problems:
Slow lift operation, loss of hydraulic pressure, leaks from pump or cylinders.
Steering Issues:
Wear in steering components, potential for play in steering wheel, and linkage adjustments.
