Market Position:
The David Brown 990 Tractor was a popular and robust agricultural machine known for its reliability and versatility in its era. This manual serves as an essential resource for owners and technicians maintaining these tractors.
Competitive Analysis:
Competed with other established tractor manufacturers of its time, offering a blend of power, efficiency, and durability. The availability of comprehensive service documentation is crucial for extending its operational life.
Key Features:
Provides detailed, step-by-step repair procedures, exploded diagrams, service data, and technical specifications essential for effective maintenance and repair. Emphasizes the use of genuine parts and correct service tools.
Ease Of Use:
Prepared with simple explanations, making it accessible for relatively new personnel to perform satisfactory service.
Instant Download Benefit:
Offers immediate access upon payment, eliminating shipping costs and delays.
Coverage Areas:
David Brown 990 Tractor - Comprehensive repair, adjustment, maintenance, removal, installation, disassembly, and assembly of all vehicle components and systems.
Page Count:
Not specified, but described as comprehensive and detailed with pictorial diagrams from bumper to bumper.
Manual Type:
Technical Service Manual / Parts Service Manual / Repair Manual
Format:
PDF (Instant Download)
Systems Covered:
Engine, transmission, drivetrain, hydraulic system, steering, braking system, electrical system, cooling system, fuel system, chassis, bodywork, operator controls, and all associated components.
Hydraulic System:
Comprehensive coverage of the hydraulic pump, control valves, lift arms, cylinder, and all associated hoses and fittings for both general-purpose and Selectamatic systems.
Procedures Included:
Maintenance, adjustments, service, removal, installation, disassembly, assembly, troubleshooting, diagnosis, testing, checking, lubrication, and repair operations. Includes special notes, important points, service data, precautions, wear limits, and factory specifications.
Adjustment Operations:
Detailed instructions for adjusting clutch, brakes, steering linkage, hydraulic system pressure, and engine settings, including reference to specific adjustment values and wear limits.
Removal Installation Procedures:
Comprehensive, step-by-step guides for removing and installing all major components and assemblies, including engine, transmission, axles, hydraulics, and steering.
Disassembly Assembly Procedures:
Detailed breakdown and reassembly instructions for individual components and sub-assemblies, supported by exploded diagrams to clarify part relationships.
Tightening Torques:
Provides critical torque specifications for fasteners on various components, essential for ensuring proper assembly and preventing damage.
Technical Depth:
Comprehensive and detailed, suitable for both professional mechanics and DIY enthusiasts. Covers basic maintenance to advanced troubleshooting and rebuild procedures, with step-by-step explanations and pictorial diagrams.
Pictorial Diagrams:
Features 'bumper to bumper' pictorial diagrams, exploded views, detailed illustrations, drawings, and photos to guide users through every service repair procedure.
Service Tool References:
Includes reference to specific special service tool numbers required for certain operations, with accompanying illustrations showing their usage.
Troubleshooting Guides:
Provides diagnosis, testing, and troubleshooting information to identify and resolve issues with various systems and components.
Specifications Lists:
Includes service data, specifications lists, tightening torques, checking and adjusting values, and allowable limits for critical parameters.
Factory Specifications:
Contains factory specifications, allowable limits, and diagnostic data for accurate repairs and adjustments, ensuring adherence to original design parameters.
Primary Engine:
Likely a diesel engine. Specifics such as cylinder count, displacement, bore, stroke, compression ratio, and power output are detailed within the manual.
Engine Type:
Likely a 3 or 4-cylinder diesel engine. Manual details cylinder head removal/installation, piston/ring replacement, and crankshaft bearing services.
Performance:
The manual details specifications for engine performance, including horsepower, torque curves, and operating parameters for optimal function. This would be model-specific, but the manual covers these aspects.
Fuel Efficiency:
While direct MPG figures are not typical for tractors, the manual provides data to ensure the engine operates at peak efficiency, impacting fuel consumption.
Fuel System:
Covers the diesel fuel injection system, including pumps, injectors, fuel filters, and associated lines, with procedures for testing, adjustment, and replacement.
Injector Testing:
Procedures for testing fuel injectors for spray pattern, pressure, and timing, crucial for optimal engine performance and fuel economy.
Standard:
Likely a manual transmission, possibly with a multi-speed gearbox and a clutch system. The manual details the removal, overhaul, and installation of the transmission components.
Optional:
The manual would cover any optional transmission configurations or power take-off (PTO) units if applicable to the 990 model.
Features:
Details on gear selection, clutch operation, differential lock (if equipped), and final drive mechanisms. Includes lubrication requirements and service intervals for the transmission and drivetrain.
Pto Operation:
Detailed instructions on the operation, maintenance, and potential repair of the power take-off (PTO) system.
Exterior:
The manual would contain dimensional data for overall length, width, height, and wheelbase, crucial for storage, transport, and workshop clearance.
Interior:
Information pertaining to the operator's station, including control layout, seat adjustments, and operator ergonomics, would be covered.
Cargo:
N/A for a tractor in the context of cargo capacity, though towing and implement attachment specifications would be relevant.
Weights:
Includes specifications for operating weight, front and rear axle weights, and any permissible ballast configurations.
Towing Capacity:
Information on the tractor's towing capacity and recommended hitching procedures for various implements.
Ratings:
While not a crash-tested vehicle, the manual emphasizes safety precautions related to operation, maintenance, and repair, including the proper use of personal protective equipment (PPE) and safe workshop practices.
Active Features:
Details on safety interlocks, braking system effectiveness, and steering system integrity. Guidance on safe operating procedures for various tasks.
Brake System Maintenance:
Specific procedures for brake adjustments, fluid changes, and component replacement to ensure safe stopping power.
Passive Features:
Focuses on the importance of maintaining the structural integrity of the tractor, including the operator's platform and any available safety frames or guards.
Service Intervals:
The manual includes a comprehensive periodic maintenance chart outlining recommended service intervals for lubrication, filter changes, fluid checks, and component inspections.
Lubrication Schedule:
Detailed lubrication schedule for all grease points, oil reservoirs, and service points, specifying type and quantity of lubricant.
Engine Oil Change:
Recommended interval for engine oil and filter changes, including oil capacity and viscosity grades.
Fluid Specifications:
Specifies required lubricants, hydraulic fluid types, coolant mixture ratios, and grease for all service points, including specific API classifications or manufacturer recommendations.
Coolant Specifications:
Information on the type of antifreeze/coolant, the correct mixture ratio with water, and cooling system maintenance procedures.
Hydraulic Fluid Type:
Specifies the correct type and grade of hydraulic fluid for the tractor's hydraulic system, including top-up procedures and capacity.
Known Issues:
While not explicitly listed as 'known issues,' the troubleshooting sections address common wear and tear problems, potential failure points, and diagnostic procedures to resolve them efficiently.
Common Repairs:
Guidance on common wear items such as seals, gaskets, clutch plates, and brake components, including procedures for their replacement.
Brand Heritage:
David Brown was a British manufacturer with a long history of producing robust and reliable agricultural machinery, known for quality engineering.
Model Evolution:
The 990 model represents a significant part of David Brown's tractor lineage, evolving from earlier designs to incorporate advancements in engine technology and functionality.
Production Variants:
The 990 was produced in several variants (e.g., 990 Selectamatic) with differing hydraulic systems and features, all of which would be covered if present in the manual.
Key Innovations:
May detail the introduction of the 'Selectamatic' hydraulic system on certain 990 variants, a significant technological advancement for its time.
Production:
Produced in various iterations from the late 1950s through the 1960s. This manual is specific to the 990 model and its configurations.
