Part of the Case Repair Manuals.
Every repair on your David Brown tractor gets easier when you open this 92-page David Brown 770 Shop Manual PDF, covering the complete 770, 780, 880, 990, 1200, 3800, and 4600 lineup. Inside, you get detailed hydraulic schematics mapping out the Implematic and Selectamatic systems, plus clear wiring diagrams to trace electrical faults fast. You also receive complete troubleshooting charts, exploded views of the transmission, and pages of factory torque tables. Adjust the single disc clutch pedal free play to exactly 1/2 to 3/4-inch, and verify the cold intake valve tappet gap is set at 0.010 inch before firing the engine. Quit guessing at adjustment clearances. Download this bookmarked file straight to your tablet, jump instantly to the right section, and get your tractor back in the dirt.
Complete the set for your Case David Brown 770, 780, 880…
- Operator Manual: David Brown 990, 995, 996 Operator Manual
- Operator Manual: David Brown 990, 995, 996 Tractor Instruction Book
- Operator Manual: David Brown 880 Diesel Tractor Operator Manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Front Axle | 5-6 | Front Wheel Bearings, Spindles, Spindle Bushings, Tie-Rods & Toe-In, Axle Center Member |
| Steering Gear | 7-8 | Remove and Reinstall, Overhaul, Ball Nut Peg Preload, Cross Shaft Bushings |
| Power Steering | 9-12 | Fluid and Bleeding, System Operating Pressure, R&R Pump, Overhaul Pump, Steering Cylinder |
| Engine | 13-23 | R&R Engine Assembly, R&R Cylinder Head, Valve Gap Adjustment, Valves, Guides and Seats, Crankshaft Oil Seals |
| Diesel Fuel System | 24-31 | Troubleshooting, Fuel Filters, Bleeding Fuel System, Fuel Injection Pump, Injector Nozzles |
| Cooling System | 33 | Radiator, Thermostat, Water Pump, Overhaul Pump |
| Electrical System | 34 | Spark Plugs, Ignition Distributor and Timing, Generator and Voltage Regulator, Starter |
| Single Disc Clutch | 35-36 | Adjustment, R&R Clutch, Overhaul Clutch, Clutch Spring Specifications |
| Dual "Livedrive" Clutch | 37-42 | Adjustment, R&R Clutch, Overhaul Clutch, Transmission Clutch Springs, PTO Clutch Springs |
| Transmission | 44-52 | Lubrication, Shift Levers, Rails & Forks, R&R Transmission Cover, Overhaul Transmission |
| Main Drive Bevel Gears and Differential | 53-54 | R&R Differential Assembly, Adjust Pinion Mesh Position, Adjust Differential Carrier Bearings, Bevel Gear Backlash |
| Final Drive | 56-59 | Lubrication and Breather, R&R Final Drive Assemblies, Wheel Axle Shaft, Axle Gear, Bearings & Seals, Spur Pinion Shaft |
| Brakes | 60-61 | Adjustment, R&R Brake Shoes, R&R or Renew Brake Drums, Brake Linkage |
| Power Take-Off | 62-64 | R&R Power Take-Off Assembly, Output Shaft Oil Seal, Overhaul PTO Assembly |
| Hydraulic System (Implematic & Selectamatic) | 65-92 | Operating Principles, Fluid Control Valves, System Checks and Adjustments, R&R and Overhaul Pump, Ram Cylinder |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Model 770 | ||
| Clutch pedal free play (single disc) | ½ to ¾-inch | p. 35 |
| Models 780 and 3800 | ||
| Clutch pedal free play (dual disc) | ¾ to 1 inch | p. 37 |
| All Models | ||
| Ether starting plug usage condition | For use in temperatures below 0° F. | p. 26 |
| Engine Low Idle RPM | 650-700 RPM | p. 3 |
| Crankshaft Main Journal Diameter | 2.499-2.4995 inches | p. 3 |
| Main Bearings Running Clearance | 0.002-0.004 inch | p. 3 |
| 770 (Late), 780, 880 (Late), 990 (Late), 1200, 3800, 4600 | ||
| Valve Tappet Gap, Cold, Intake | 0.010 inch | p. 31 |
| 770, 780, 880, 990 (Early), 1200 (Early) | ||
| Transmission Capacity (Includes Differential & Hydraulic System) | 24 Quarts | p. 4 |
| all diesel models | ||
| Cylinder Head Retaining Nuts/Cap Screws Torque (Final) | 90 Ft.-Lbs. | p. 14 |
| all models | ||
| Fuel Injection Pump Opening Pressure | 2575 psi | p. 30 |
