All 48 pages of this David Brown 3800 and 4600 Selectamatic Livedrive Repair Manual (OEM #TP 665) focus on the 3-cylinder gasoline engines powering both tractors from 1968 to 1970. Inside: a full maintenance section covering valve clearance, spark plug service, and carburettor procedures, plus a troubleshooting section to trace ignition and fuel faults before you pull anything apart. You get step-by-step disassembly of pistons and connecting rods, crankshaft and bearings, timing gears, and the governor, with exploded views throughout and a dimensional data section packed with tightening torques, wear limits, and valve stem diameters. Before buttoning up, confirm the oil warning light switch opens between 9 and 13 lb/sq in; no adjustment is possible, so replace it if it doesn't. Your machine sat long enough. Bookmarked by section, open it on your tablet and jump straight to the spec you need.
What's Inside This David Brown 3800 Selectamatic Livedrive, 4600 Selectamatic Livedrive, 3-Cylinder Gasoline Engines Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Maintenance | 6-9 | Engine Oil, Air Cleaner, Fuel Feed Pump Sediment Bowl, Distributor, Spark Plugs, Valve Clearance |
| Fuel System | 10-16 | The Carburetter |
| Ignition System | 17-19 | Distributor |
| Lubrication System | 20-23 | Oil Pump, Relief Valve, Oil Filter, Camshaft Oilways, Crankshaft Oil Passage |
| Cooling System | 24-39 | Engine Tune, Decarbonising, Pistons and Connecting Rods, Crankshaft and Bearings, Timing Gears, Governor, Engine Removal |
| Dimensional Data | 40-44 | Engine Details, Tightening Torques, Capacities, Wear Limits, Valve Stem Diameters, Crankshaft |
| Summary of Design Changes | 45 | Governor Housing Cover Adjustable Stop, Cylinder Block Core Plugs, Piston Compression Ratio, Carburetter Jet Sizes, Throttle Linkage, Main Bearings and Thrust Washers |
| Approved Lubricants | 46-48 | Engine and Air Cleaner, Transmission and Hydraulic System, Belt Pulley and Steering Box, Power-Assisted Steering, Final Drive Reductions, King Pin and Front Trunnion (Pivot) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil warning light switch opening pressure | 9 to 13 lb/sq in | p. 21 |
David Brown 3800 Selectamatic Livedrive, 4600 Selectamatic Livedrive, 3-Cylinder Gasoline Engines Common Problems This Manual Covers
David Brown 4600 Selectamatic engine oil warning light stays illuminated after start up and warm up p. 21
Test the oil warning light switch opening pressure. Connect a gauge to the main oil gallery. Verify the switch opens between 9 to 13 lb/sq in as specified on page 21. Replace the switch immediately if pressure falls outside this range because no adjustment is possible.
Manual Section: Lubrication SystemHydraulic bypass valve sticks in place with erratic implement movement and total loss of lift
Remove the kidney-shaped hydraulic access cover carefully to stop internal parts from falling into the axle case. Inspect the hold and bypass valve assembly for wear. Clean the bypass strainer in the filter. Verify the engine oil switch opens at 9 to 13 lb/sq in before testing the hydraulics.
Manual Section: MaintenanceEngine exhibits difficult cold starting and excessive fuel consumption during normal field operations p. 13
Inspect the carburetter components using the troubleshooting procedures on page 13. Clean the fuel feed pump sediment bowl and check the distributor contact points. Adjust the throttle linkages to eliminate jerky operation. Ensure the engine oil pressure switch opens at 9 to 13 lb/sq in to confirm proper system operation.
Manual Section: Carburetter TroubleshootingFrequently Asked Questions
How do you fix engine oil warning light stays illuminated after start up and warm up?
Test the oil warning light switch opening pressure. Connect a gauge to the main oil gallery. Verify the switch opens between 9 to 13 lb/sq in as specified on page 21. Replace the switch immediately if pressure falls outside this range because no adjustment is possible.
How do you fix hydraulic bypass valve sticks in place with erratic implement movement and total loss of lift?
Remove the kidney-shaped hydraulic access cover carefully to stop internal parts from falling into the axle case. Inspect the hold and bypass valve assembly for wear. Clean the bypass strainer in the filter. Verify the engine oil switch opens at 9 to 13 lb/sq in before testing the hydraulics.
How do
Inspect the carburetter components using the troubleshooting procedures on page 13. Clean the fuel feed pump sediment bowl and check the distributor contact points. Adjust the throttle linkages to eliminate jerky operation. Ensure the engine oil pressure switch opens at 9 to 13 lb/sq in to confirm proper system operation.
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