Market Position:
Essential documentation for owners and mechanics of David Brown 850, 880, 950, and 990 Series Implematic tractors, enabling cost-effective self-maintenance and repair.
Competitive Analysis:
This manual provides the crucial technical details that allow users to bypass the need for expensive dealer servicing, making it a highly valuable resource for maintaining these classic agricultural machines.
Key Features:
Comprehensive coverage, step-by-step instructions, clear diagrams and pictures, instant delivery, multi-device compatibility, printable format, lifetime ownership.
Coverage Areas:
All service and repair procedures A-Z, all models, engines, trim, and transmission types.
Page Count:
Not explicitly stated, but described as 'complete' and 'covers all repair procedures A-Z'.
Manual Type:
Workshop Service Repair Manual
Language:
English (assumed based on description language)
Systems Covered:
Engine, Fuel System, Cooling System, Lubrication System, Electrical System, Ignition System, Clutch, Transmission (Gearbox), Final Drive, Rear Axle, Power Take-Off (PTO), Hydraulic System (including Implematic linkage), Steering System, Braking System, Front Axle, Chassis, Bodywork, Controls, Instrumentation, Troubleshooting.
Procedures Included:
Step-by-step instructions for all servicing and repair jobs, diagnostics, adjustments, overhauls, rebuilds, component replacement, and scheduled maintenance.
Technical Depth:
Comprehensive, from basic maintenance and adjustments to complete engine and transmission rebuilds, hydraulic system diagnostics and repair, and electrical system troubleshooting.
Diagnostic Procedures:
Includes procedures for diagnosing common mechanical, hydraulic, and electrical faults, often with flowcharts or symptom-based troubleshooting.
Engine Rebuild Details:
Detailed instructions for engine disassembly, component inspection (e.g., cylinder bore, crankshaft journals), fitting new parts, and reassembly, including bearing clearances and ring end gap specifications.
Transmission Rebuild Details:
Comprehensive guide for gearbox disassembly, inspection of gears, shafts, bearings, and synchromesh components, along with assembly procedures and lubrication points.
Hydraulic System Coverage:
In-depth coverage of the Implematic hydraulic pump, control valve, lift arms, draft control system, and associated pipework and seals.
Electrical System Diagrams:
Includes wiring diagrams for lighting, starting, charging, and instrumentation systems, with component identification.
Torque Settings Engine:
Specific torque values for critical engine fasteners such as cylinder head bolts, connecting rod bolts, main bearing caps, and flywheel nuts.
Torque Settings Transmission:
Torque specifications for transmission case bolts, differential housing, and other drivetrain components.
Parts Identification Details:
While not a parts catalog, the manual will identify key components and their functions, aiding in parts ordering.
Technical Data Tables:
Likely includes tables for engine specifications, fluid capacities, bearing clearances, and other essential technical data.
Schematics Included:
Flow diagrams for hydraulic systems and electrical schematics are standard in such manuals.
Engine Type:
David Brown diesel engines (typically AD4/45, AD4/55, AD4/65 variations across models).
Horsepower Range:
Varies by specific model and engine variant (e.g., 850 series typically 35-45 HP, 950/990 series 45-65 HP).
Torque Specifications:
Detailed torque settings for critical engine components (e.g., cylinder head bolts, main bearing caps) will be found within the manual.
Fuel System Type:
Direct injection diesel, typically utilizing Simms or CAV fuel injection pumps.
Oil Capacity Approx:
Capacity details and oil type specifications (e.g., API CD or equivalent) will be provided for each engine variant.
Cooling System Type:
Water-cooled, pressurized system with a thermostat.
Valve Clearance Spec:
Precise cold valve clearance specifications for intake and exhaust valves will be detailed for each engine.
Transmission Type:
David Brown designed constant mesh gearbox with a multi-speed range selector.
Optional Features:
Some models may have offered creeper gears or alternative PTO options.
Implematic System:
The manual covers the operation, maintenance, and repair of the 'Implematic' hydraulic draft control and linkage system, a key feature of these tractors.
Transmission Fluid Type:
Specific recommendations for transmission and hydraulic oil (e.g., SAE 80W/90 GL-4 or dedicated tractor hydraulic fluid) will be detailed.
Engine Oil Change Interval:
Typically every 100-250 operating hours, with specific details provided in the manual.
Air Filter Service Interval:
Regular checks and cleaning/replacement based on operating conditions, with specifications in the manual.
Engine Oil Specification:
API CD or equivalent diesel engine oil, viscosity grade dependent on ambient temperature (e.g., SAE 20W-30, SAE 30, SAE 10W-30).
Coolant Specification:
Water mixed with antifreeze (ethylene glycol based) in the correct ratio for temperature and corrosion protection.
Hydraulic Fluid Specification:
Often shared with transmission oil; specific grades like SAE 80W/90 or specialized tractor hydraulic fluids will be detailed.
Common Issues:
Wear in the Implematic hydraulic system (leaks, sluggishness), clutch wear, potential for engine wear (e.g., piston rings, bearings) due to age, electrical system reliability.
Troubleshooting Guidance:
The manual provides comprehensive troubleshooting charts and procedures for common problems across all major systems.
Brand Heritage:
David Brown Tractors, a British manufacturer renowned for robust and reliable agricultural machinery, formed part of the Tenneco conglomerate later.
Model Evolution:
The 850, 880, 950, and 990 series represented a significant evolution in David Brown's tractor line, incorporating hydraulic systems like the Implematic and developing more powerful diesel engines.
Production Period:
These models were primarily produced from the late 1950s through the 1960s.
Manufacturing Locations:
United Kingdom.
