Target User:
Farm owners, mechanics, restoration enthusiasts, and DIY repair individuals.
Value Proposition:
Enables cost savings on repairs and maintenance by empowering users with in-depth knowledge and step-by-step guidance.
Instruction Style:
Easy-to-follow, step-by-step instructions with accompanying pictures and diagrams.
Completeness:
Comprehensive coverage of all service and repair jobs, including routine maintenance.
Accessibility:
Instant digital download for immediate access to repair information.
Engine Overhaul:
Complete engine rebuild procedures, including piston, ring, cylinder, crankshaft, camshaft, valve train, and oil pump servicing.
Fuel System:
Carburetor/injection system diagnosis and repair, fuel pump, filters, and lines. Specifics for diesel injection systems if applicable.
Cooling System:
Radiator, thermostat, water pump, hoses, and fan servicing and repair.
Ignition System:
Spark plug diagnosis, distributor, coil, and wiring inspection and replacement.
Transmission:
Gearbox overhaul, clutch service, gear selection mechanisms, and PTO (Power Take-Off) operation and repair.
Drivetrain:
Differential, rear axle, driveshafts, and final drive unit maintenance and repair.
Braking System:
Hydraulic brake system diagnosis, repair, including master cylinder, wheel cylinders, brake shoes/pads, and drums/rotors.
Steering System:
Steering box, linkage, and components service and adjustment.
Hydraulic System:
Lift system, remote hydraulic outlets, pump, control valve, and cylinder repair and maintenance.
Electrical System:
Wiring diagrams, battery, starter, alternator, lighting, and instrument panel troubleshooting and repair.
Chassis And Bodywork:
Frame, fenders, seat, and general body component repair and adjustments.
Routine Maintenance:
Oil changes, filter replacements, greasing, lubrication points, and general inspection procedures.
Troubleshooting Guides:
Systematic diagnostic procedures for common and uncommon problems across all vehicle systems.
Repair Instructions:
Detailed, step-by-step instructions for disassembly, repair, reassembly, and adjustment of all major components.
Wiring Diagrams:
Comprehensive electrical schematics for all circuits, aiding in diagnosis and repair.
Torque Specifications:
Exact torque values for critical fasteners to ensure proper assembly and prevent damage.
Special Tool Information:
Identification and usage of specialized tools required for specific repair procedures.
Diagnostic Capabilities:
In-depth diagnostic procedures for identifying the root cause of mechanical and electrical faults.
Rebuild Procedures:
Complete overhaul and rebuilding instructions for major mechanical assemblies like engines and transmissions.
Adjustment Specifications:
Precise settings and adjustments for engine timing, carburetor, brakes, and hydraulic systems.
Component Identification:
Clear identification of all parts with diagrams and part numbers where applicable.
Engine Type:
Likely a 4-cylinder diesel engine (common for this era and model series).
Engine Family:
David Brown AD4.240 or similar variants (common for the 990/995 series).
Displacement:
Approximately 4.2 litres (252 cubic inches) for the AD4.240 engine.
Horsepower:
Typically in the range of 50-65 PTO horsepower, depending on specific configuration and engine tuning.
Torque:
Specifications vary, but designed for robust low-end torque crucial for agricultural work.
Injection System:
Likely a Lucas or CAV inline fuel injection pump and injectors.
Engine Oil Change:
Typically every 250 hours of operation or annually.
Fuel Filter Change:
Recommended at first service and then every 500 hours, or as needed if fuel quality is poor.
Air Filter Service:
Inspect and clean at frequent intervals (e.g., daily in dusty conditions), replace as necessary.
Transmission Oil Change:
Typically every 1000 hours or biennially.
Engine Oil:
API CD or CE rated diesel engine oil, SAE 15W-40 or 20W-50 depending on ambient temperature. Specific viscosity recommendations from the manual are crucial.
Hydraulic Transmission Oil:
David Brown Specification (DBT) approved hydraulic transmission oil or equivalent (e.g., Universal Tractor Transmission Oil - UTTO) meeting specifications like John Deere J20C.
Coolant:
Ethylene glycol based antifreeze with corrosion inhibitors, typically a 50/50 mix with water.
Hydraulic Lift Problems:
Common issues can include slow lift, dropping implements, or inconsistent hydraulic pressure, often due to worn pump seals, faulty control valves, or low oil levels.
Clutch Wear:
Clutch slip or difficulty engaging gears can occur with age and heavy use.
Diesel Injection Issues:
Fuel system blockages, worn injectors, or timing issues can lead to rough running or starting problems.
