Positioning:
Authoritative, genuine factory service manual, differentiating from aftermarket alternatives. Targets owners and technicians seeking the highest level of repair information.
Differentiation:
Emphasizes authenticity ('REAL FACTORY MANUAL') over aftermarket or potentially misleading publications. High page count and comprehensive digital features enhance value.
Features:
Instant download, comprehensive coverage, searchable and bookmarked PDF, detailed diagrams, factory specifications, wide device compatibility.
Engine:
Engine Removal, Cylinder Head, Valves, Rocker Arm, Cylinder Block, Crankshaft, Flywheel, Oil Seals, Lubrication System, Cooling System
Fuel System:
Fuel System, Thermostart System, Fuel Injection Pumps, Fuel Injectors
Electrical:
Electrical System Troubleshooting, Wiring Diagrams (Tractor, 94 Series With/Without Cab), Electrical Equipment
Steering:
Steering Hand Pump, Steering System Oil Pump (1190/1194 and 1290/1390/1294/1394), Steering Cylinder (Side Mounted - 1394), Front Axle (MFD - David Brown and Carraro)
Power Train:
Powershift Transmission Troubleshooting, Continuous Clutch (Borg and Beck), Synchromesh Transmission, Single Speed PTO, Differential, Final Drives, Independent Clutch (Laycock), Transfer Gearbox (David Brown and MFD), Powershift Hydraulic Pump, Powershift Control Valve, Powershift Sequence Valves, Three Speed Transmission (Powershift), Reversible PTO Shaft, Differential Powershift Transmission, Creeper Gearbox, Multi Speed PTO
Brakes:
Brakes (Drum, Shoes, Adjustments)
Hydraulic System:
Filters, Pumps, Relief Valves, Rockershaft, Lift Cylinder, Selectamatic Control Valve Removal, Selector Dial Mechanism, Draft Sensing Units, Remote Valves and Couplers, Hydraulic Adjustments, Hydraulic System Specifications, Selectamatic Valve
Chassis:
Rear Platform and Fenders, Air Conditioning Troubleshooting and System Checks, Air Conditioning System Service
Maintenance:
Routine Maintenance, Fluid Changes, Lubrication, Filter Replacements, Brake Adjustments, Hydraulic System Adjustments, Air Conditioning Servicing
Troubleshooting:
Engine Issues, Fuel System Problems, Electrical Faults, Steering System Malfunctions, Transmission Operation, Hydraulic System Performance, Brake System Issues
Repair:
Engine Rebuild (Head, Block, Crankshaft), Fuel System Component Overhaul, Transmission Overhaul, Hydraulic Component Repair, Brake System Servicing, Steering System Repair, PTO Component Service
Diagnostics:
Electrical System Diagnostics, Hydraulic System Diagnostics, Engine Performance Diagnostics, Transmission Diagnostics
Depth:
Comprehensive factory-level detail, including exploded diagrams, torque specifications, clearances, and detailed step-by-step procedures.
Searchability:
Fully searchable text
Navigation:
Fully bookmarked chapters for easy navigation
Indexing:
Indexed content
Quality:
Improved quality PDF
Illustrations:
Detailed illustrations, exploded diagrams, drawings, and photos
Printability:
Printable pages (individual pages or entire manual)
Zoom Capability:
Zoomable for detailed viewing
Binding:
N/A (Digital Download)
Paper Type:
N/A (Digital Download)
Operating Systems:
All Versions of Windows, Mac, iOS, BB, iPhone, iPad, Android
Engine Type:
Likely direct-injection diesel engine (specific model not detailed in provided text, but common for David Brown tractors of this era).
Horsepower Range:
Typically in the 70-90 HP range, depending on specific engine variant and tuning (e.g., 1390 usually around 80-85 HP).
Torque:
Specifications would be detailed within the manual, crucial for engine repair and tuning.
Injection System:
Mechanical fuel injection pumps and injectors. Thermostart system for cold-weather starting is mentioned.
Transmission Types:
Synchromesh Transmission, Powershift Transmission, Continuous Clutch (Borg and Beck), 12/12 Independent Clutch (Laycock).
Optional Features:
Powershift, Creeper Gearbox, Multi Speed PTO, Reversible PTO Shaft, Mechanical Front Drive (MFD).
Transfer Gearbox:
David Brown Transfer Gearbox, Mechanical Front Drive Transfer Gearbox.
Pto Systems:
Single Speed PTO, Reversible PTO Shaft, Multi Speed PTO.
Engine Oil Change:
Typically 250 hours or annually, but specific recommendation is in the manual.
Fuel Filter Replacement:
Recommended at regular intervals, often tied to hours or annually.
Hydraulic Oil Change:
Typically 500-1000 hours or annually, depending on operating conditions.
Engine Oil:
Typically SAE 30 or 15W-40 Heavy Duty Diesel Engine Oil (e.g., API CD/CE). Manual specifies exact API rating and viscosity grade.
Hydraulic Oil:
Tractor hydraulic fluid (e.g., Hy-Tran or equivalent) or a specified ISO VG 46 hydraulic oil. Manual details compatibility and specifications.
Transmission Fluid:
Varies based on transmission type (Synchromesh, Powershift). Manual will specify the correct type and grade, likely a universal tractor transmission fluid (UTTF) or specific gear oil.
Coolant:
Ethylene glycol-based antifreeze mixture (50/50 recommended) for freeze and corrosion protection. Manual specifies type and capacity.
Common Wear Points:
Wear in the differential, final drives, and clutch components are common with age and heavy use. Hydraulic pump and valve wear can also occur.
Engine Specific Issues:
Potential for head gasket leaks, injector pump wear, and general wear on the cylinder block and crankshaft over extensive operational hours.
Electrical System Challenges:
Wiring harness degradation, switch failures, and alternator/starter issues are typical for older machinery.
Heritage:
David Brown was a well-established British tractor manufacturer, known for robust and reliable machinery. Merged with J.I. Case in 1971, forming J.I. Case Company, which later became part of Tenneco.
Series:
The 1390 is part of the 90 series range (which includes 1190, 1290, 1390, 1194, 1294, 1394), representing advancements in tractor technology for their time.
Production Period:
The 1390 model was produced primarily in the late 1970s and early 1980s.
Manufacturing Location:
Originally manufactured in the UK by David Brown, and later by J.I. Case.
