Target Audience:
Owners and mechanics of David Brown 770 tractors requiring detailed repair and maintenance information.
Value Proposition:
Provides essential technical data for efficient and accurate repair, reducing downtime and professional service costs.
Digital Access:
Instant download eliminates shipping delays and costs, providing immediate access to critical repair data.
Comprehensive Coverage:
Covers all major mechanical and electrical systems for thorough servicing.
Engine Service:
Complete engine overhaul, tuning, fuel system, lubrication system, cooling system, engine removal/installation.
Transmission Service:
Gearbox disassembly, assembly, troubleshooting, maintenance, fluid changes.
Hydraulic System:
Hydraulic pump, lift cover, remote control valves, cylinder repair, system bleeding, fluid specifications.
Electrical System:
Wiring diagrams, starter motor, generator/alternator, lighting, instrumentation, troubleshooting.
Braking System:
Brake pedal assembly, master cylinder, wheel cylinders, brake linings, adjustments, fluid specifications.
Steering System:
Steering column, linkages, adjustments, troubleshooting.
Frontend And Rear Axle:
Front axle beam, kingpins, rear axle housing, differential, final drives, bearings, seals.
Power Take Off Pto:
PTO shaft, clutch, engagement mechanisms, maintenance.
Cooling System:
Radiator, fan, thermostat, water pump, coolant specifications.
Fuel System:
Fuel tank, filters, injection pump, injectors, bleeding procedures.
Bodywork And Chassis:
Fenders, operator platform, controls, chassis components.
Routine Maintenance:
Lubrication points, oil change intervals, filter replacement, greasing schedule.
Troubleshooting Guides:
Diagnosis of common problems and fault finding procedures for all major systems.
Repair Procedures:
Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation.
Adjustment Procedures:
Valve clearances, clutch, brakes, PTO engagement, hydraulic system settings.
Torque Specifications:
Essential torque values for critical fasteners and engine components.
Depth Of Coverage:
Comprehensive workshop level, suitable for professional mechanics and experienced DIY users.
Diagnostic Capabilities:
Detailed troubleshooting charts and symptom-based diagnostics.
Searchability:
Likely searchable text, enabling quick information retrieval.
Print Readability:
Designed for clear reproduction when printed, ensuring legibility of diagrams and text.
Binding:
Not applicable for digital download; user can print and bind as desired.
Paper Recommendation:
For printing, standard printer paper is suitable; heavier stock recommended for frequent workshop use.
Engine Manufacturer:
David Brown
Engine Model:
Often the David Brown 3-cylinder diesel engine (e.g., AD4/360 or similar variations).
Engine Type:
4-stroke, naturally aspirated, diesel
Horsepower Range:
Approximately 46-52 PTO horsepower (varies by specific engine variant and tuning).
Injection System:
Direct injection, typically rotary or inline injection pump.
Oil Type Recommendation:
Refer to manual for specific API service classification and viscosity grade (e.g., SAE 15W-30 or 20W-50 diesel engine oil).
Coolant Type:
Ethylene glycol-based antifreeze/coolant mixture, with appropriate corrosion inhibitors.
Transmission Type:
David Brown Selectamatic transmission (often with 8 forward and 4 reverse gears, or variations thereof).
Creeper Gear:
May be available as an option on some models.
Gear Selection:
Mechanical gear lever for range selection and a separate lever for speed selection, influenced by the Selectamatic hydraulic control.
Transmission Oil Type:
Refer to manual for specific hydraulic fluid type, often a Universal Tractor Transmission Oil (UTTO) or equivalent.
Engine Oil Change Interval:
Typically 100-125 operating hours, refer to manual for exact specification.
Transmission Hydraulic Service:
Typically 600-1000 operating hours for fluid and filter change, refer to manual.
Air Filter Service:
Check regularly, replace as needed based on operating conditions.
Engine Oil Capacity:
Approximately 7.5 - 8.5 liters (depending on specific engine variant and filter).
Transmission Hydraulic Capacity:
Approximately 30-35 liters, refer to manual.
Common Wear Points:
Hydraulic lift system (especially seals and pump), PTO clutch wear, brake adjustments, and front axle wear.
Potential Leaks:
Common leak points include hydraulic hoses, PTO seals, and axle oil seals.
Importance Of Hydraulics:
The Selectamatic hydraulic system is critical; regular fluid and filter changes are paramount to its longevity.
Engine Governor:
Ensure the engine governor is properly serviced for optimal performance and starting.