Target User:
Farm owners, mechanics, and agricultural machinery enthusiasts seeking to perform their own maintenance and repairs on David Brown 850/950 Implematic tractors.
Value Proposition:
Empowers users to save significantly on repair costs by providing comprehensive, step-by-step guidance with clear illustrations.
Ease Of Use:
Features very easy to follow, step-by-step instructions and clear pictures to simplify complex repair tasks.
Accessibility:
Instant email delivery upon purchase, with permanent access to the digital manual for printing or viewing on multiple devices.
Engine:
Comprehensive overhaul, diagnostics, fuel system, lubrication system, cooling system, exhaust system, starting and charging system.
Hydraulics:
Detailed coverage of the Implematic hydraulic system, including pump, valves, cylinders, hoses, and associated components; troubleshooting and repair procedures.
Transmission:
Overhaul and repair of gearbox, clutch, PTO, differential, and final drives.
Front Axle:
Steering system, kingpins, stub axles, and differential unit.
Rear Axle:
Brake system, hub reduction gears, and half shafts.
Electrical System:
Wiring diagrams, starter motor, generator/alternator, battery, lighting, ignition system, and instrumentation.
Operator Controls:
Steering column, throttle control, brake pedals, clutch pedal, gear levers, and PTO controls.
Chassis And Bodywork:
Frame, fenders, drawbar, operator platform, and mounting points for implements.
Routine Maintenance:
Lubrication schedules, fluid checks and changes, filter replacement, and general inspection procedures.
Troubleshooting:
Diagnostic charts and step-by-step procedures for identifying and resolving common and complex problems.
Overhaul And Rebuild:
Detailed instructions for complete disassembly, inspection, repair, and reassembly of major components.
Component Replacement:
Step-by-step guidance for replacing specific parts and assemblies.
Adjustment Procedures:
Correct settings and adjustments for clutch, brakes, hydraulic valves, and linkage systems.
Safety Precautions:
Essential safety guidelines to be followed during maintenance and repair operations.
Depth:
Comprehensive, covering from basic maintenance to complete engine and transmission overhauls, including detailed diagnostic information.
File Format Quality:
High-quality PDF, ensuring clarity of text and images; designed for clear printing.
Printability:
Printable by chapter or in its entirety.
Searchability:
Likely searchable text content within the PDF for easy information retrieval.
Device Compatibility:
Compatible with all PC & MAC Computers, tablets, and mobile phones via Adobe Reader.
Engine Type:
Diesel (typically a 3-cylinder or 4-cylinder direct injection engine, depending on specific 850/950 variant).
Typical Displacement:
Approx. 2.6 to 3.1 liters (exact figures vary by engine variant).
Typical Horsepower:
Ranges from approximately 38 HP to 52 HP (gross, depending on the specific model and engine).
Typical Torque:
Torque figures are significant for pulling power in this class, though precise figures vary.
Injection System:
Direct injection, often with rotary or inline fuel injection pumps (e.g., CAV, Bosch).
Oil Type:
API CD or CE rated diesel engine oil, SAE 30 or 20W-50 recommended depending on operating temperature.
Cooling Method:
Water-cooled via a radiator and fan.
Transmission Type:
David Brown Implematic gearbox (a non-synchronized constant mesh transmission offering multiple forward and reverse gears).
Other Options:
Varying gear configurations and PTO options depending on the specific 850/950 variant.
Clutch:
Dual-stage clutch (for transmission and PTO engagement).
Gearbox Oil:
API GL-4 SAE 90 or 80W-90 gear oil for transmission and differential.
Safety Standards:
Reflects safety standards of its era; manual covers safe operation and maintenance procedures.
Braking System:
Drum brakes or sometimes disc brakes on later models, typically mechanical actuation.
Operator Station:
Open operator station with foot pedals, steering wheel, and hand controls; safety often relies on operator awareness and adherence to safe practices.
Engine Oil Change:
Typically every 100-150 operating hours or annually.
Fuel Filter Replacement:
As needed, or at regular intervals (e.g., annually or every 250 hours).
Hydraulic Filter Replacement:
Recommended at specified intervals or when hydraulic performance degrades.
Hydraulic Fluid:
David Brown Implematic Hydraulic Oil (a specialized hydraulic fluid; manual will specify exact type and viscosity, likely an ISO VG 46 or similar).
Coolant:
Water-glycol mixture (50/50) for freeze protection and corrosion inhibition.
Common Problems:
Hydraulic system leaks or reduced lifting capacity, PTO engagement issues, wear in the transmission synchronizers (if applicable to specific variants), and general wear and tear on high-usage components.
Diagnostic Focus Areas:
Careful attention to hydraulic oil levels and condition, clutch adjustment, and starter motor functionality.
Manufacturer:
David Brown Tractors Ltd., a British manufacturer known for its robust and reliable agricultural machinery.
Timeline:
The 850 and 950 models were part of David Brown's successful post-war tractor lineup, evolving from earlier designs and incorporating the advanced 'Implematic' integrated hydraulic system.
Manufacturing Era:
Produced primarily from the late 1950s through the 1960s.
