David Brown 770, 780, 880, 990, 1200, 3800, 4600 OEM Service Manual OEM
93 Pages • 10.41 MB • Instant, Printable PDF
David Brown Models Covered & Key Technical Specifications
Models: David Brown 770, 780, 880, 990, 1200, 3800, 4600
Sub-models / Variants: AD3/30, AD3/49, AD3/55, AD4/47, AD4/55, 349101, 355011, 355101, Single Disc, Dual Disc, Livedrive, Six-speed, Twelve-speed
Model Years: 1970s–1980s
Serial Numbers: 770 (Early/Late), 780 (Starting S/N 52101), 880 (Early/Late), 990 (Starting S/N 467871), 1200, 3800, 4600
Technical Data:
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Engine configuration: 3 and 4-cylinder diesel
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Engine displacement: 137, 146, 154, 164, 185, 186, 219 cubic inches
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Compression ratio: 17:1
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Alternator output: 35–55 A
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Cylinder head bolt torque: 54–68 Nm (40–50 ft-lbs)
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Valve clearance (cold): 0.25–0.38 mm (0.010–0.015 in)
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Fuel tank capacity: 23–45 liters (6–12 US gallons)
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Operating pressure (Selectamatic): 2000 psi
David Brown Manual Features & Content Preview
- Covers 1970s–1980s David Brown 770, 780, 880, 990, 1200, 3800, and 4600 models (including standard and Livedrive transmissions)
- Comprehensive 93-page factory-authorized resource featuring a cross-referenced paragraph index
- Contains 219 technical diagrams and exploded views for transmission, hydraulic, and engine systems
Hydraulic and Drivetrain Technical Scope
This 93-page technical publication lays out the mechanical systems for classic David Brown utility tractors. It provides technicians and DIYers with the exact reference values needed for a smooth teardown or rebuild. Instead of waiting for a physical manual to ship, the instant download puts these critical specifications on your device right away. This keeps your shop projects on schedule.
The text covers the 3-cylinder AD3/30, AD3/49, and AD3/55 engines, alongside the 4-cylinder AD4/47 and AD4/55 variants. Readers gain a clear overview of engine assemblies, manual transmission gear sets, and final drive configurations.
Specification and Reference Values
Technical data within the documentation lists the crucial thresholds required for accurate maintenance. For instance, cylinder head bolt torque is strictly documented at 40–50 ft-lbs (54–68 Nm) across the relevant diesel blocks. You will also find intake valve clearance listed at 0.010–0.015 in (0.25–0.38 mm).
Tractor hydraulic systems store immense energy. Reviewing the prescribed Selectamatic and Implematic pressure relief protocols detailed here—including the 2000 psi operating limit for Selectamatic units—is highly recommended before cracking open any lines or servicing hydraulic pumps. Fuel system capacities ranging from 23 to 45 liters are also outlined.
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