1960-1963 David Brown 850, 880, 950, 990, Industrial & Crawler Tractors Repair Manual (P/N DBT. 445)
162 Pages • 18.60 MB • Instant, Printable PDF
David Brown Models Covered & Key Technical Specifications
Models: David Brown 850 Implematic, David Brown 880 Implematic, David Brown 950 Implematic, David Brown 990 Implematic
Sub-models / Variants: Livedrive, Narrow, Industrial Tractor, 40TD Crawler Tractor
Model Years: 1960–1963
Serial Numbers: 850 Implematic 850/C/310001 onwards, 880 Implematic 880/C/350001 onwards, 950 Implematic 950/3A/400001 onwards, 990 Implematic 990/A/440001 onwards
Technical Data:
- Engine cooling optimal temperature: 180°F (82°C)
- Max rated engine speed: 1800 rev/min
- Cylinder head bolt torque: 35 ft. lbs (47 Nm)
- Gearbox mounting bolt torque: 100 lb ft (13.83 kg m)
- Max hydraulic fluid delivery: 13.7 gal/min (62.3 L/min)
- Standard tire pressure (cranking): 415–435 lb/in² (29.0–30.5 kg/cm²) at 250 rev/min
David Brown Manual Features & Content Preview
- Official 162-page David Brown OEM workshop publication (P/N DBT. 445, first edition July 1961 with subsequent revisions)
- Covers 1960–1963 David Brown 850, 880, 950, and 990 tractors, including Implematic, Livedrive, and Industrial variants
- Documents engine, gearbox, hydraulic, and clutch specifications essential for accurate restoration
- Contains 42 detailed component diagrams, 5 hydraulic system flow schematics, and 4 comprehensive torque specification tables
- Serves as the authoritative reference for the 1960s production build of the Implematic series, offering precise alignment data missing from later generic aftermarket manuals
Technical Overview and Design
The factory-specified service documentation for these Implematic tractors outlines critical overhaul procedures. It extensively covers disassembly, inspection, and reassembly protocols for primary powerplants like the AD4/40T and AD4/40U engines. Mechanics will find precise clearance requirements for pistons, connecting rods, and camshaft journals. Furthermore, the hydraulic system sections break down the operation of the pump unit, control valves, and the automatic hold mechanism. This provides essential reference material for troubleshooting the differential lock and three-way valve units used specifically on the 950 and 990 series.
Engineering Specifications
Technical data within this manual includes the exact tightening values and clearance charts required for safe drivetrain maintenance. For instance, cylinder head bolt torque is clearly specified at 35 ft. lbs. Gearbox mounting torque is documented at 100 lb ft. Coolant system capacities for the 950 Implematic series are detailed in the design notes, broken down by serial number ranges. You will also find comprehensive data on valve timing settings, piston ring end gaps, and hydraulic pump output ratings for the Dowty pump assemblies. Always review and strictly adhere to all listed factory safety precautions and load limits before initiating any heavy mechanical work or lifting operations on these machines.
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