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Allis Chalmers D-21 & D-21 Series II Service Repair Manual PDF Download
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Basic Information Identification Make: Allis-Chalmers Model: D-21 / D-21 Series II Introduction Market Position Target Audience: Owners, mechanics, and service professionals working on Allis-Chalmers D-21 and D-21 Series II tractors....
Type: Construction
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| Basic Information | |
| Identification | |
| Make: | Allis-Chalmers |
| Model: | D-21 / D-21 Series II |
| Introduction | |
| Market Position | |
| Target Audience: | Owners, mechanics, and service professionals working on Allis-Chalmers D-21 and D-21 Series II tractors. |
| Competitive Analysis | |
| Value Proposition: | Provides vehicle-specific, dealership-level repair information, enabling owners to perform maintenance and repairs effectively, saving on professional service costs. |
| Key Features | |
| Accuracy And Clarity: | Accurate, clear, and concise text combined with diagrams and illustrations for ease of understanding. |
| Manufacturer Origin: | Written by the manufacturer, ensuring the highest level of accuracy and detail. |
| Manual Details | |
| Coverage Areas | |
| Primary Coverage: | Service, Repair, Maintenance, Troubleshooting, Diagnostics |
| Page Count | |
| Estimated Page Count: | Varies by specific edition, typically 500-1000+ pages for comprehensive service manuals. |
| Manual Type | |
| Type: | Service Repair Workshop Manual |
| Language | |
| Language: | English |
| Format | |
| Format: | PDF Download |
| Manual Coverage | |
| Systems Covered | |
| Engine Service And Overhaul: | Complete disassembly, inspection, repair, and reassembly of the engine. Includes cylinder head, pistons, rings, crankshaft, camshaft, valves, timing gears, lubrication system, cooling system, and fuel system. |
| Fuel System Details: | Carburetor adjustment and repair, fuel pump operation and service, fuel filter replacement, fuel line routing and specifications. |
| Electrical System: | Wiring diagrams, battery service, starting system, charging system (alternator/generator), ignition system (spark plugs, coils, distributor), lighting, gauges, and accessory circuits. |
| Transmission And Drivetrain: | Manual transmission overhaul and repair, clutch service, differential and rear axle assembly, drive shafts, and PTO (Power Take-Off) operation and service. |
| Hydraulic System: | Hydraulic pump service, control valve operation and repair, hydraulic cylinder specifications, fluid types, and troubleshooting of hydraulic systems (e.g., for implement control). |
| Steering System: | Steering gear inspection and adjustment, linkage service, power steering system (if equipped) troubleshooting and repair. |
| Braking System: | Brake shoe and drum inspection/replacement, brake pedal adjustment, hydraulic brake system components and service. |
| Cooling System: | Radiator service, thermostat replacement, water pump inspection and repair, coolant specifications and capacities, fan belt adjustment. |
| Lubrication System: | Oil pump service, oil filter replacement, lubrication points and schedules, oil capacities for various components. |
| Chassis And Frame: | Frame inspection and repair, front axle and steering components, rear axle assembly, wheel bearing service. |
| Bodywork And Sheet Metal: | Hood removal/installation, fender repair, dashboard and control panel access, operator seat service. |
| Procedures Included | |
| Routine Maintenance: | Engine oil and filter change, air cleaner service, fuel filter replacement, checking and topping up fluids, lubrication points, battery maintenance. |
| Diagnostic Procedures: | Step-by-step troubleshooting guides for common issues related to engine performance, starting, hydraulics, electrical systems, and transmission. |
| Repair Procedures: | Detailed instructions for disassembling, repairing, and reassembling all major vehicle components. |
| Troubleshooting Guides: | Systematic approaches to identifying and resolving problems, often categorized by symptom. |
| Wiring Schematics: | Comprehensive electrical diagrams illustrating component connections and circuit pathways. |
| Specifications And Tolerances: | Precise measurements for clearances, torques, pressures, and other critical parameters for proper assembly and function. |
| Technical Depth | |
| Depth Of Coverage: | Comprehensive, covering everything from basic adjustments to complete engine and transmission rebuilds. Suitable for professional mechanics and skilled DIY enthusiasts. |
| Manual Specifications | |
| File Format | |
| Compatibility: | Compatible with all versions of Windows and Mac. |
| Reader Requirement: | Requires Adobe PDF Reader. |
| Print Quality | |
| Printability: | Printable. Individual pages can be printed as needed. |
| Binding Type | |
| Binding: | N/A (Digital PDF Download) |
| Paper Type | |
| Paper Type: | N/A (Digital PDF Download) |
| Engine Specifications | |
| Primary Engine | |
| Engine Model D21: | Allis-Chalmers 6-cylinder diesel (specific model designation typically found in VIN or engine block, e.g., 3400 Series). |
| Engine Model D21 Series Ii: | Likely an updated or variant of the original D-21 engine, potentially with minor displacement or performance enhancements. Specific details would be in the manual. |
| Performance | |
| Displacement: | Approximately 301 cubic inches (4.9 liters) for the D-21. Series II may have slight variations. |
| Horsepower Rating: | Around 70-75 PTO horsepower for the D-21. Exact figures vary by test conditions and specific configurations. |
| Torque Output: | Specific torque figures would be detailed in the manual, important for heavy-duty applications. |
| Fuel System | |
| Fuel Type: | Diesel |
| Injection System: | Typically a rotary or inline injection pump system. Specific makes like Bosch or Roosa-Master would be detailed. |
| Transmission | |
| Standard | |
| Transmission Type: | Manual transmission with multiple gear ranges (e.g., 8-speed or 12-speed constant mesh). |
| Optional | |
| Power Take Off Pto: | Standard PTO (e.g., 540/1000 RPM) and potentially live PTO options for Series II models. |
| Features | |
| Clutch Type: | Dual-stage clutch (one for transmission, one for PTO). |
| Dimensions | |
| Exterior | |
| Wheelbase: | Approximate wheelbase: 90-94 inches (2286-2388 mm). Specific measurements in manual. |
| Length: | Approximate length: 130-140 inches (3302-3556 mm). Specific measurements in manual. |
| Weights | |
| Operating Weight: | Approximate: 6,500 - 7,500 lbs (2948 - 3402 kg). Exact weights vary by configuration. |
| Safety Features | |
| Ratings | |
| Operator Safety: | Emphasis on safe operating procedures, rollover protection (ROPS) considerations, and proper maintenance to ensure safe operation. |
| Active Features | |
| Braking System Design: | Internal expanding shoe brakes, designed for reliable stopping power under load. |
| Passive Features | |
| Operator Station: | Basic operator station design focused on accessibility and control placement. Manual would detail any safety interlocks or warnings. |
| Technology Features | |
| Infotainment | |
| Operator Controls: | Mechanical levers and pedals for transmission, PTO, hydraulics, and steering. No electronic infotainment systems. |
| Driver Assistance | |
| Instrumentation: | Basic dashboard with ammeter, oil pressure gauge, temperature gauge, and tachometer/hour meter. |
| Connectivity | |
| Power Systems: | 12-volt electrical system for starting and powering lights and gauges. |
| Maintenance | |
| Service Intervals | |
| Engine Oil Change Interval: | Typically every 100-200 operating hours or annually. Specific interval found in manual. |
| Transmission Oil Change Interval: | Recommended at regular intervals (e.g., 500-1000 hours), depending on workload. Manual will specify. |
| Hydraulic Fluid Change Interval: | Typically based on hours of operation and operating conditions. Manual provides specific guidance. |
| Fluid Specifications | |
| Engine Oil Type: | Diesel engine oil, typically SAE 30 or 15W-40 API CD/CE rated. Exact specification in manual. |
| Transmission Fluid Type: | Gear oil, likely SAE 80W-90 or 90W. Manual will specify. |
| Hydraulic Fluid Type: | Tractor hydraulic fluid (THF) or equivalent. Specific viscosity and type detailed in manual. |
| Known Issues | |
| Engine Wear: | Typical wear items like piston rings, bearings, and valve seats. Injector pump and injector nozzle issues can occur with age and fuel quality. |
| Hydraulic System Performance: | Slow operation or loss of pressure can indicate worn pump seals, valve pack issues, or leaks in the system. |
| Electrical System Reliability: | Wiring insulation degradation, corroded connections, and failing electrical components (starter, generator) are common with age. |
| Transmission Engagement: | Wear in synchronizers or engagement sleeves can lead to difficult shifting or popping out of gear. |
| Vehicle History | |
| Brand Heritage | |
| Allis Chalmers Legacy: | Allis-Chalmers was a major American manufacturer of agricultural and construction machinery, known for its innovation and robust equipment. |
| Model Evolution | |
| D Series Development: | The D-21 was a significant tractor for Allis-Chalmers, representing advancements in power and features for its era. The Series II likely introduced refinements and updates. |
| Production | |
| Production Years: | The D-21 was primarily produced in the late 1950s and early 1960s. Series II production would follow. |
| Awards & Recognition | |
| Recognitions | |
| Industry Standing: | Allis-Chalmers tractors were generally well-regarded for their durability and performance in their respective eras, though specific awards for the D-21 model are not widely documented in general automotive/agri-tech circles. |