Target Audience:
Owners, mechanics, technicians, and restorers of David Brown 770 and 870 tractors.
Value Proposition:
Provides professional-level repair and maintenance data, offering significant cost savings over dealer service or incomplete third-party manuals.
Completeness:
Full factory service manual, not a condensed or trial version, covering all repair and maintenance procedures.
Accessibility:
Instant download, available on multiple devices, and usable for a lifetime.
Primary Coverage:
David Brown 770 and 870 Tractors
Engine Variants Covered:
Likely covers all engine options offered for the 770 and 870 series.
Transmission Variants Covered:
Likely covers all transmission options offered for the 770 and 870 series.
Estimated Page Count:
Hundreds (as stated in description, likely 500+ pages for a comprehensive factory manual)
Type:
Factory Service and Repair Workshop Manual
Language:
English (implied by product description and common for this type of manual)
Format:
PDF (Portable Document Format)
Usage License:
Lifetime use, no expiry dates, multiple computer installations allowed.
Engine Service:
Detailed procedures for engine overhaul, tune-ups, diagnostics, and component replacement.
Fuel System:
In-depth coverage of fuel injection pumps, injectors, filters, and related components.
Cooling System:
Maintenance and repair of radiator, water pump, thermostat, and cooling fan.
Lubrication System:
Oil pump, filter, pressure, and lubrication pathways.
Transmission And Drivetrain:
Service and repair of gearbox, clutch, differential, axles, and PTO.
Hydraulic System:
Repair and maintenance of hydraulic pump, valves, cylinders, and control systems.
Steering System:
Procedures for mechanical and/or power steering systems.
Braking System:
Service and repair of mechanical or hydraulic braking mechanisms.
Electrical System:
Wiring diagrams, starter motor, alternator, battery, lighting, and ignition systems.
Body And Chassis:
Repair and maintenance of the tractor frame, fenders, and operator controls.
Scheduled Maintenance:
Detailed service schedules for all major components and systems.
Troubleshooting:
Diagnostic flowcharts and step-by-step troubleshooting guides for common and uncommon issues.
Repair And Overhaul:
Complete disassembly, cleaning, inspection, repair, and reassembly procedures for all major components.
Component Replacement:
Instructions for replacing individual parts and assemblies.
Adjustment Procedures:
Calibration and adjustment of clutch, brakes, engine timing, and hydraulic systems.
Diagnostic Codes:
Information on diagnostic indicators or error codes if applicable to the model's electrical system.
Depth Of Coverage:
Comprehensive factory-level technical detail suitable for professional mechanics and experienced DIY technicians.
Visual Aids:
Hundreds of detailed photos, diagrams, and exploded views for clarity and accuracy.
Specifications Data:
Includes critical torque values, clearances, fluid capacities, and performance specifications.
Searchability:
Likely searchable text within the PDF for quick information retrieval.
Printable:
Yes, individual pages or the entire manual can be printed.
Binding Type:
Not Applicable (Digital Download)
Paper Type:
Not Applicable (Digital Download)
Operating Systems:
Compatible with Windows and macOS computers.
Engine Type:
Likely a British Leyland or David Brown diesel engine (specifics depend on exact model variant).
Displacement Range:
Likely in the 2.5 to 3.5 liter range, common for tractors of this era and size.
Cylinders:
Typically 3 or 4 cylinders for these models.
Horsepower Range:
Estimate 40-60 HP, depending on the specific 770 or 870 variant.
Torque Specifications:
Manual will provide specific torque figures for critical engine components like head bolts and main bearings.
Injection System:
Likely Lucas or CAV rotary injection pumps and nozzle assemblies.
Gearbox Type:
Likely a constant mesh or synchromesh gearbox with multiple forward and reverse gears.
Power Take Off Pto:
Standard PTO configurations (e.g., 540 RPM) are usually detailed, potentially with dual-speed options.
Differential Lock:
Information on engaging and maintaining the differential lock, if equipped.
Transmission Oil:
Manual will specify the correct API GL-4 or GL-5 gear oil type and viscosity (e.g., 80W-90 or 85W-140).
Roll Over Protection:
Information on ROPS (Roll-Over Protective Structures) if factory-fitted or an available option, and their maintenance.
Safety Interlocks:
Details on any safety interlocks related to PTO engagement, transmission, or hydraulics.
Operator Station:
Guidance on safe operation of the operator station, controls, and safety guards.
Engine Oil Change:
Typical intervals of 100-250 operating hours, with specific guidance provided.
Fuel Filter Replacement:
Regular replacement recommended, often with engine oil changes or as per diagnostic indicators.
Hydraulic Fluid Change:
Intervals typically range from 250-500 operating hours, depending on workload and fluid quality.
Engine Oil Specification:
API CD/CE or higher rated diesel engine oil, viscosity typically 15W-40 or 20W-50 depending on climate. Specific brand recommendations may be in the manual.
Coolant Specification:
Ethylene glycol-based antifreeze mixed with distilled water, typically a 50/50 ratio. Manual will specify inhibitor type.
Hydraulic Fluid Specification:
Universal Tractor Transmission Fluid (UTTF) or specific hydraulic fluid meeting Case/David Brown specifications. Manual will detail.
Common Wear Items:
Potential common issues include clutch wear, hydraulic pump seals, PTO clutch packs, and aging electrical components.
Engine Reliability:
David Brown engines are generally robust, but attention to cooling system maintenance and fuel quality is crucial.
David Brown Legacy:
David Brown was a renowned British tractor manufacturer known for robust and reliable agricultural machinery before its integration into the Case IH brand.
Series Context:
The 770 and 870 models represent a significant part of David Brown's mid-range tractor offerings, built for versatility and durability.
Production Era:
Likely produced in the late 1960s and 1970s, a period of significant development in agricultural technology.
