CASE I.H. 1944 (DAVID BROWN) Tractor Service Repair Manual
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🏷️ Basic Information Identification Make: David Brown Model: 950 / 990 / 995 / 996 (CASE I.H. 1944 is a misnomer, referring to a CASE IH manual covering these David Brown models) Year: 1960s - 1970s (Approximate production years for covered models) Vehicle Type: Agricultural Tractor Codes Case Ih Product Code: Likely a consolidated manual for multiple David Brown model lines, potentially designated by an internal CASE IH reference like '1944' which does not directly correlate to a specific model year or VIN series in the David Brown lineage. 👋 Introduction Market Position Target Audience: Owners, mechanics, and technicians responsible for the maintenance and repair of David Brown 950, 990, 995, and 996 tractors. Competitive Analysis Industry Context: David Brown tractors were known for their robust build and reliability, competing with brands like Massey Ferguson, Fordson, and International Harvester in the agricultural sector. Key Features Manual Value Proposition: Provides essential, factory-authorized procedures to maintain and repair these classic tractors, extending their operational life and ensuring correct functionality. Historical Significance: Covers tractors that were instrumental in agricultural modernization during their production era. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, and maintenance procedures for David Brown 950, 990, 995, and 996 agricultural tractors. Secondary Coverage: Troubleshooting, diagnostics, electrical systems, hydraulic systems, engine overhaul, transmission repair, and component rebuilding. Page Count Estimated Pages: Highly variable depending on specific edition, but typically 300-600+ pages for a complete factory service manual. Manual Type Type: Factory Service Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine: Detailed breakdown of the AD/DA series diesel engines (e.g., AD4.248, AD6.354) including cylinder head, block, crankshaft, pistons, rings, lubrication, cooling, and fuel systems. Transmission: Coverage of the David Brown constant mesh, sliding mesh, and synchromesh transmissions, including gearbox overhaul, clutch assembly, PTO (Power Take-Off) operation, and final drives. Hydraulics: In-depth coverage of the David Brown 'Vari-Drive' or 'Haldex' hydraulic system, including hydraulic pump, lift cover, draft control, position control, hydraulic fluid specifications, and troubleshooting. Electrical: Wiring diagrams, component testing (alternator, starter motor, battery, lights), ignition system (if applicable to specific models/engine variations), and dashboard instrumentation. Front Axle Steering: Service and repair procedures for the front axle, steering knuckles, tie rods, and steering box, including lubrication and alignment. Braking System: Details on the drum brake system, brake pedal linkage, brake fluid, and adjustments. Bodywork Chassis: Information on chassis components, fenders, seat assembly, drawbar, and minor body panel repairs. Procedures Included Engine Overhaul: Complete engine rebuilding procedures, including piston and ring replacement, bearing replacement, valve servicing, and cylinder head gasket replacement. Transmission Rebuild: Step-by-step instructions for disassembling, inspecting, and reassembling the gearbox and associated components. Hydraulic System Repair: Troubleshooting and repair of hydraulic pump failures, cylinder leaks, and control valve issues. Tune Up Maintenance: Scheduled maintenance tasks, including oil changes, filter replacements, valve adjustments, and fuel system bleeding. Troubleshooting Diagnostics: Diagnostic charts and procedures for identifying and rectifying common problems across all major systems. Electrical Diagnostics: Troubleshooting electrical faults using wiring diagrams and component testing methods. Technical Depth Depth Of Coverage: Comprehensive, covering everything from basic operator maintenance to full mechanical overhauls and component rebuilding. Diagnostic Capabilities: Includes detailed diagnostic procedures, specifications, and tolerances for accurate fault finding. Rebuild Instructions: Provides detailed instructions for rebuilding major assemblies like engines, transmissions, and hydraulic pumps. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchable Text: Likely yes, depending on the quality of the OCR during digitization, allowing for keyword searches. Print Quality Digital Rendering: Dependent on the original source material and digitization quality. Typically clear text and legible diagrams. Binding Type Original Binding: Not applicable for PDF format, but original manuals were typically bound with staples, perfect binding, or ring binders. Paper Type Original Paper Quality: Typically printed on durable, uncoated paper suitable for workshop environments. ⚙️ Engine Specifications Primary Engine Engine Family: David Brown AD/DA Series Diesel Engines Common Engine Variants: AD4.248 (4-cylinder), AD6.354 (6-cylinder) Bore Stroke Ad4 248: 3.625" x 5.00" (92.1 mm x 127.0 mm) Displacement Ad4 248: 248 cubic inches (4.07 Liters) Bore Stroke Ad6 354: 3.875" x 5.00" (98.4 mm x 127.0 mm) Displacement Ad6 354: 354 cubic inches (5.80 Liters) Performance Horsepower 950 Implements: Approximately 50-60 PTO HP (Varies by model and engine) Horsepower 990 Implements: Approximately 60-70 PTO HP (Varies by model and engine) Torque Specifications: Specific torque figures for critical engine components (e.g., head bolts, main bearings) will be detailed within the manual. Fuel System Injection Type: Direct Injection Injection Pump Manufacturer: Likely Simms, CAV, or Lucas (specifics in manual) Fuel Type: Diesel 🔧 Transmission Standard Gearbox Type 950: 8-Speed Constant Mesh (4 forward, 2 reverse, plus high/low range) Gearbox Type 990 995 996: 8-Speed Constant Mesh (4 forward, 4 reverse) or 12-speed with Multi-Power option Optional Multi Power Transmission: Available on some models...
950 / 990 / 995 / 996 (CASE I.H. 1944 is a misnomer, referring to a CASE IH manual covering these David Brown models)
Year:
1960s - 1970s (Approximate production years for covered models)
Vehicle Type:
Agricultural Tractor
Codes
Case Ih Product Code:
Likely a consolidated manual for multiple David Brown model lines, potentially designated by an internal CASE IH reference like '1944' which does not directly correlate to a specific model year or VIN series in the David Brown lineage.
👋 Introduction
Market Position
Target Audience:
Owners, mechanics, and technicians responsible for the maintenance and repair of David Brown 950, 990, 995, and 996 tractors.
Competitive Analysis
Industry Context:
David Brown tractors were known for their robust build and reliability, competing with brands like Massey Ferguson, Fordson, and International Harvester in the agricultural sector.
Key Features
Manual Value Proposition:
Provides essential, factory-authorized procedures to maintain and repair these classic tractors, extending their operational life and ensuring correct functionality.
Historical Significance:
Covers tractors that were instrumental in agricultural modernization during their production era.
📋 Manual Details
Coverage Areas
Primary Coverage:
Comprehensive service, repair, and maintenance procedures for David Brown 950, 990, 995, and 996 agricultural tractors.
Highly variable depending on specific edition, but typically 300-600+ pages for a complete factory service manual.
Manual Type
Type:
Factory Service Repair Manual
Language
Language:
English
Format
Digital Format:
PDF
📖 Manual Coverage
Systems Covered
Engine:
Detailed breakdown of the AD/DA series diesel engines (e.g., AD4.248, AD6.354) including cylinder head, block, crankshaft, pistons, rings, lubrication, cooling, and fuel systems.
Transmission:
Coverage of the David Brown constant mesh, sliding mesh, and synchromesh transmissions, including gearbox overhaul, clutch assembly, PTO (Power Take-Off) operation, and final drives.
Hydraulics:
In-depth coverage of the David Brown 'Vari-Drive' or 'Haldex' hydraulic system, including hydraulic pump, lift cover, draft control, position control, hydraulic fluid specifications, and troubleshooting.
Electrical:
Wiring diagrams, component testing (alternator, starter motor, battery, lights), ignition system (if applicable to specific models/engine variations), and dashboard instrumentation.
Front Axle Steering:
Service and repair procedures for the front axle, steering knuckles, tie rods, and steering box, including lubrication and alignment.
Braking System:
Details on the drum brake system, brake pedal linkage, brake fluid, and adjustments.
Bodywork Chassis:
Information on chassis components, fenders, seat assembly, drawbar, and minor body panel repairs.
Procedures Included
Engine Overhaul:
Complete engine rebuilding procedures, including piston and ring replacement, bearing replacement, valve servicing, and cylinder head gasket replacement.
Transmission Rebuild:
Step-by-step instructions for disassembling, inspecting, and reassembling the gearbox and associated components.
Hydraulic System Repair:
Troubleshooting and repair of hydraulic pump failures, cylinder leaks, and control valve issues.
Tune Up Maintenance:
Scheduled maintenance tasks, including oil changes, filter replacements, valve adjustments, and fuel system bleeding.
Troubleshooting Diagnostics:
Diagnostic charts and procedures for identifying and rectifying common problems across all major systems.
Electrical Diagnostics:
Troubleshooting electrical faults using wiring diagrams and component testing methods.
Technical Depth
Depth Of Coverage:
Comprehensive, covering everything from basic operator maintenance to full mechanical overhauls and component rebuilding.
Diagnostic Capabilities:
Includes detailed diagnostic procedures, specifications, and tolerances for accurate fault finding.
Rebuild Instructions:
Provides detailed instructions for rebuilding major assemblies like engines, transmissions, and hydraulic pumps.
📊 Manual Specifications
File Format
File Type:
PDF (Portable Document Format)
Searchable Text:
Likely yes, depending on the quality of the OCR during digitization, allowing for keyword searches.
Print Quality
Digital Rendering:
Dependent on the original source material and digitization quality. Typically clear text and legible diagrams.
Binding Type
Original Binding:
Not applicable for PDF format, but original manuals were typically bound with staples, perfect binding, or ring binders.
Paper Type
Original Paper Quality:
Typically printed on durable, uncoated paper suitable for workshop environments.
⚙️ Engine Specifications
Primary Engine
Engine Family:
David Brown AD/DA Series Diesel Engines
Common Engine Variants:
AD4.248 (4-cylinder), AD6.354 (6-cylinder)
Bore Stroke Ad4 248:
3.625" x 5.00" (92.1 mm x 127.0 mm)
Displacement Ad4 248:
248 cubic inches (4.07 Liters)
Bore Stroke Ad6 354:
3.875" x 5.00" (98.4 mm x 127.0 mm)
Displacement Ad6 354:
354 cubic inches (5.80 Liters)
Performance
Horsepower 950 Implements:
Approximately 50-60 PTO HP (Varies by model and engine)
Horsepower 990 Implements:
Approximately 60-70 PTO HP (Varies by model and engine)
Torque Specifications:
Specific torque figures for critical engine components (e.g., head bolts, main bearings) will be detailed within the manual.
Fuel System
Injection Type:
Direct Injection
Injection Pump Manufacturer:
Likely Simms, CAV, or Lucas (specifics in manual)
Fuel Type:
Diesel
🔧 Transmission
Standard
Gearbox Type 950:
8-Speed Constant Mesh (4 forward, 2 reverse, plus high/low range)
Gearbox Type 990 995 996:
8-Speed Constant Mesh (4 forward, 4 reverse) or 12-speed with Multi-Power option
Optional
Multi Power Transmission:
Available on some models (e.g., 990), offering a powershift capability for on-the-go gear changes in selected ranges.
Features
Pto Options:
Standard 540 RPM PTO, some models may have optional 1000 RPM PTO.
Clutch Type:
Dual-stage clutch (for transmission and PTO operation).
📐 Dimensions
Exterior
Wheelbase Typical:
Approx. 75-80 inches (190-203 cm) - Varies by model and configuration.
Overall Length Typical:
Approx. 120-130 inches (305-330 cm) - Without implements.
Overall Width Typical:
Approx. 65-75 inches (165-190 cm) - At rear wheels, without extensions.
Weights
Operating Weight Typical:
Approx. 4,000 - 5,500 lbs (1,814 - 2,495 kg) - Varies significantly by model and ballast.
Drawbar Hitch Type:
Category 2, 3-point linkage, heavy-duty drawbar.
🛡️ Safety Features
Ratings
Historical Safety Standards:
Tractors from this era predated stringent modern safety regulations. Features like ROPS (Roll-Over Protective Structure) and seatbelts were often optional or not standard.
Active Features
Braking System Performance:
Drum brakes providing adequate stopping power for agricultural use when properly maintained. Manual will detail adjustment procedures.
Passive Features
Operator Station:
Basic operator platform with fenders. Manual will cover seat adjustments and pedal placement for safe operation.
💡 Technology Features
Infotainment
Infotainment System:
None. These tractors are purely functional agricultural machinery from a pre-digital era.
Driver Assistance
Driver Assistance Features:
None. Focus is on basic mechanical operation.
Connectivity
Connectivity Features:
None.
🔧 Maintenance
Service Intervals
Engine Oil Change:
Typically every 100-150 operating hours or annually. Manual will specify exact interval and oil type.
Hydraulic Fluid Change:
Recommended every 500-1000 operating hours or annually. Manual will detail filter replacement and fluid checks.
Transmission Oil Change:
Typically every 800-1200 operating hours. Manual will provide capacity and grade.
Air Filter Service:
Frequent checking and cleaning, especially in dusty conditions. Replacement intervals will be specified.
Fuel Filter Replacement:
Recommended at regular intervals, often with oil changes or as per manual guidance.
Fluid Specifications
Engine Oil Grade:
Typically SAE 30 or 15W-40 Heavy Duty Diesel Engine Oil. Manual will provide exact API service classification (e.g., CD, CE).
Hydraulic Fluid Type:
David Brown Hy-Trans or equivalent high-quality tractor hydraulic fluid (UTTO - Universal Tractor Transmission Oil). Manual will list specifications and alternatives.
Transmission Oil Grade:
Often the same as hydraulic fluid (Hy-Trans) or a specified gear oil. Capacity and grade detailed in manual.
Coolant Type:
Ethylene glycol-based antifreeze mixture. Manual will specify ratio and type.
Potential for oil consumption with high hours, injection pump timing, and glow plug issues in colder climates.
Electrical Aging:
Aging wiring harnesses, corrosion on electrical connections, and starter/alternator wear are common in older vehicles.
📚 Vehicle History
Brand Heritage
David Brown Legacy:
David Brown Tractors Ltd. was a British manufacturer known for producing reliable and durable tractors from the post-war era until its acquisition by Tenneco (owner of J.I. Case) in 1971. The brand continued under the J.I. Case/CASE IH umbrella.
Model Evolution
Series Development:
The 950, 990, 995, and 996 represent a progression of David Brown's popular medium-horsepower tractors, evolving from earlier models like the 25, 30, 50, 700, and 850 series. They were known for their versatile hydraulic systems and sturdy transmissions.
Production
Manufacturing Locations:
Primarily Meltham, Yorkshire, England.
Production Period:
The 950/990 series began production in the early 1960s, with the 995/996 models introduced later in the decade and into the early 1970s.
🏆 Awards & Recognition
Recognitions
Brand Awards:
David Brown tractors were generally well-regarded for their engineering and durability within the agricultural industry during their production runs.
Ratings
User Ratings:
Highly prized by collectors and users for their robust construction and repairability, often receiving positive 'user' ratings for longevity and performance.
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