Tractor Segment:
The D-15 was positioned as a versatile utility tractor, suitable for small to medium-sized farms, orchards, and general property maintenance. It competed with tractors from manufacturers like John Deere, Ford, and Farmall.
Key Competitors:
John Deere 3020/4020 (larger scale), Ford 4000/5000 series, Farmall (various models), Massey Ferguson (various models).
Versatility:
Known for its robust construction, reliable performance, and ability to handle a wide range of implements through its PTO and hydraulic systems.
Engine Options:
Offered with both gasoline and diesel engine variants, providing flexibility for different operating conditions and fuel preferences.
Driver Comfort:
While basic by modern standards, it featured a comfortable seating position and accessible controls for its era.
Engine Overhaul:
Detailed procedures for engine disassembly, inspection, repair, and reassembly, including piston rings, bearings, cylinder heads, valve trains, and timing.
Fuel System:
Carburetor adjustment, repair, and troubleshooting; fuel pump service; fuel filter replacement.
Cooling System:
Radiator service, water pump repair, thermostat replacement, coolant specifications and flushing.
Ignition System:
Spark plug service, ignition timing, distributor overhaul, coil testing.
Electrical System:
Wiring diagrams, battery service, starter motor and generator/alternator testing and repair, lighting systems.
Clutch:
Clutch assembly inspection, adjustment, replacement, and troubleshooting.
Transmission Gearbox:
Service and repair of the transmission, including gear shifting mechanisms, bearings, and seals. Identification of gear ratios.
Power Take Off Pto:
PTO engagement mechanism service, maintenance, and repair.
Rear Axle Differential:
Rear axle disassembly, overhaul, bearing adjustments, and differential service.
Hydraulics And Linkage:
Service and troubleshooting of the hydraulic lift system (likely a Category 1 or similar), control valve repair, hydraulic pump and cylinder service. Three-point hitch adjustment.
Steering System:
Steering gearbox adjustment, tie rod and drag link service, wheel alignment.
Braking System:
Brake band adjustment, brake shoe replacement, brake linkage service.
Front Axle And Steering Components:
Front wheel bearing service, kingpin and spindle inspection, front axle pivot lubrication.
Body And Fenders:
Sheet metal repair, fender mounting, seat adjustment and repair.
Preventative Maintenance:
Detailed scheduled maintenance tasks, including lubrication points, filter changes, fluid level checks, and tune-up procedures.
Troubleshooting Guides:
Systematic diagnostic procedures to identify and resolve common operational problems, often presented in a chart format.
Repair Procedures:
Step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, reassembly, and installation.
Adjustment Procedures:
Specific instructions for adjusting various systems, such as clutch engagement, brake band tension, valve lash, and carburetor settings.
Torque Specifications:
Critical torque values for engine, transmission, and chassis fasteners to ensure proper assembly and prevent damage.
Diagnostic Charts:
Flowcharts and symptom-based diagnostics to quickly pinpoint the cause of mechanical or electrical issues.
Wiring Diagrams:
Detailed electrical schematics for various configurations, essential for troubleshooting electrical faults.
Special Tool Identification:
Listing or description of specialized tools required for specific repair operations.
Depth Of Coverage:
Expert-level; covers complete overhaul and rebuild of major components. Suitable for professional mechanics and serious DIYers.
Engine Make Model:
Allis-Chalmers (proprietary or sourced, often known for their own engine designs)
Engine Type Gasoline:
Typically a 4-cylinder, L-head or overhead valve gasoline engine. Displacement around 180-200 cubic inches.
Engine Type Diesel:
Typically a 4-cylinder, direct injection diesel engine. Displacement around 200-220 cubic inches.
Horsepower Gasoline:
Estimated 40-50 PTO horsepower.
Horsepower Diesel:
Estimated 45-55 PTO horsepower.
Torque Specifications:
Specific torque figures depend on engine variant; manual will detail these.
Carburetor Gasoline:
Marvel-Schebler or Zenith carburetor models common. Manual will specify precise model and settings.
Fuel Type Gasoline:
Regular Unleaded Gasoline.
Fuel Type Diesel:
Diesel Fuel (ASTM D975 Grade No. 1-D or No. 2-D).
Fuel Tank Capacity:
Approximately 12-15 gallons, depending on specific configuration.
Oil Type:
Engine Oil: API Service Classification CD, CE, or SF/CC; viscosity SAE 30 or 10W-30 depending on ambient temperature (refer to manual for precise chart).
Oil Capacity:
Approximate oil capacity: 5-6 quarts with filter change.
Ignition System Type:
Spark ignition (gasoline), Compression ignition (diesel).
Engine Oil Change:
Every 100-200 operating hours or annually, as specified in the manual.
Air Filter Service:
Clean or replace as needed, more frequently in dusty conditions (refer to manual).
Fuel Filter Replacement:
At manufacturer-specified intervals, typically every 200-400 hours or annually.
Transmission Oil Change:
Every 1000-1200 operating hours or every 2-3 years, depending on usage.
Grease Points:
Lubricate all grease fittings (refer to lubrication chart in manual) at daily or weekly intervals depending on usage.
Coolant Type:
Permanent type antifreeze (e.g., ethylene glycol base) mixed with water in a 50/50 ratio. Specific Allis-Chalmers coolant if available. Manual will specify.
Hydraulic Fluid Type:
Allis-Chalmers Hydraulic Fluid (or equivalent tractor hydraulic fluid meeting UTTO specifications, e.g., John Deere Hy-Gard compatible fluid). Manual is critical here for compatibility.
Brake Fluid Type:
N/A (Mechanical brake bands, no hydraulic fluid in brake system).
Common Wear Items:
Clutch wear, PTO clutch engagement issues, hydraulic system leaks, starter/generator brushes, cooling system component wear (hoses, radiator).
Engine Trouble:
Carburetor gumming, fuel delivery issues, valve train wear, potential head gasket leaks.
