Historical Context:
The Allis-Chalmers D-15 Series II was a popular utility tractor known for its versatility and reliability in its era, serving agricultural, industrial, and landscaping needs.
Versatility:
Designed to handle a wide range of implements through its robust PTO and hydraulic system.
Engine Options:
Available in both gasoline and diesel variants, offering choices based on user preference and operating conditions.
Comparison:
Competed with tractors from manufacturers like John Deere, Ford, International Harvester, and Massey Ferguson in the mid-size utility tractor segment.
Engine:
Detailed coverage of the gasoline and diesel engine options, including teardown, assembly, troubleshooting, and specifications.
Fuel System:
Carburetor and injection system service, fuel pump, filters, and tank maintenance.
Cooling System:
Radiator, water pump, thermostat, fan, and associated hoses and passages.
Electrical System:
Generator/alternator, starter, battery, ignition system, lighting, and wiring diagrams.
Transmission:
Gearbox, clutch, PTO (Power Take-Off) engagement, and related drivetrain components.
Hydraulic System:
Hydraulic pump, reservoir, control valves, lift arms, and cylinder service for 3-point hitch and external hydraulics.
Steering System:
Manual steering components and potential power steering system diagnosis and repair.
Brake System:
Drum brake service, linkage adjustment, and hydraulic brake components.
Front Axle And Steering:
Kingpins, tie rods, spindle assemblies, and front wheel bearings.
Rear Axle And Differential:
Differential service, axle shafts, and final drive maintenance.
Power Take Off Pto:
PTO clutch, shaft, and engagement mechanism.
Chassis And Frame:
Frame integrity, drawbar, and mounting points.
Bodywork And Fenders:
Sheet metal, grille, fenders, and operator platform.
Maintenance:
Regular servicing, lubrication points, filter changes, and preventative maintenance schedules.
Troubleshooting:
Diagnostic guides for common problems, symptom analysis, and fault finding.
Repair:
Step-by-step instructions for component replacement, adjustment, and overhaul.
Rebuilds:
Detailed procedures for complete engine, transmission, and hydraulic system rebuilds.
Calibration And Adjustment:
Setting valve clearances, ignition timing, clutch free play, and hydraulic pressures.
Level:
Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts. Covers routine maintenance to complete overhauls.
Gasoline Engine Model:
Allis-Chalmers 4-cylinder gasoline (specific model number not universally consistent, but often referred to by displacement).
Gasoline Displacement:
Approximately 157 cubic inches (2.57 Liters).
Diesel Engine Model:
Allis-Chalmers 4-cylinder diesel (specific model number varies).
Diesel Displacement:
Approximately 157 cubic inches (2.57 Liters).
Gasoline Horsepower Estimated:
Around 45-50 PTO horsepower (estimates vary).
Diesel Horsepower Estimated:
Around 40-45 PTO horsepower (estimates vary).
Gasoline Carburetor:
Typically a Zenith or Marvel-Schebler updraft or downdraft carburetor.
Diesel Injection:
Roosa Master or similar rotary injection pump system.
Gearbox Type:
Constant mesh, sliding gear transmission with multiple forward and reverse speeds.
Number Of Speeds:
Typically 8 forward and 2 reverse speeds, plus creeper gears in some configurations.
Power Director:
Some models offered a Power Director (direct drive clutch/power shift) for on-the-go gear changes under load.
Pto Speeds:
Standard 540 RPM PTO, with optional 1000 RPM or ground speed PTO configurations.
Clutch:
Single or dual-stage clutch depending on PTO and transmission options.
Engine Oil Change:
Typically every 50-100 operating hours, depending on operating conditions and oil type.
Transmission Oil Change:
Recommended every 1200-2400 operating hours or annually.
Hydraulic Oil Change:
Recommended every 600-1200 operating hours or annually.
Engine Oil Gasoline:
API Service SC, SD, or SE grade oil, SAE 30 or 10W-30 depending on ambient temperature.
Engine Oil Diesel:
API Service CD or CE grade oil, SAE 30 or 10W-30 depending on ambient temperature.
Transmission Fluid:
Allis-Chalmers Type 1 or equivalent (often SAE 80W-90 GL-4 gear oil or tractor hydraulic fluid depending on specific drivetrain).
Hydraulic Fluid:
Allis-Chalmers Type 1 or equivalent (tractor hydraulic fluid meeting specific viscosity and additive requirements).
Coolant:
Ethylene glycol based antifreeze with corrosion inhibitors, typically a 50/50 mix with distilled water.
Engine:
Potential for valve seat wear (especially with lead-free fuels if not properly addressed), carburetor issues (gumming, leaks), diesel injector pump timing drift.
Transmission:
Worn clutch components, synchro ring wear in higher gear ratios, potential for PTO engagement issues.
Hydraulic System:
Leaking hydraulic cylinders and seals, worn hydraulic pump, control valve spool wear.
Electrical System:
Generator/alternator output issues, starter solenoid failure, wiring harness degradation over time.
Cooling System:
Radiator corrosion and leaks, water pump seal failure, thermostat sticking.
