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David Brown 990 - User Manual

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Summary

ENGINE

ENGINE (Cont.)

Details and specifications for the engine, continuing from previous sections.

R&R ENGINE ASSEMBLY

Step-by-step guide for removing and reinstalling the engine assembly.

Models 880 and 4600

Specific procedures for engine removal and installation on models 880 and 4600.

FINAL DRIVE ASSEMBLY

HYDRAULIC LIFT SYSTEM

Adjustments

Steps for adjusting the hydraulic lift system for optimal performance.

POWER STEERING

FLUID AND BLEEDING

Procedure for bleeding the power steering system and checking fluid levels.

SYSTEM OPERATING PRESSURE

Guidance on checking power steering system pressure for proper function.

REAR AXLE

TRANSMISSION

Assembly, R & R

Procedures for removing and installing the transmission assembly.

CONDENSED SERVICE DATA

GENERAL

General specifications and data for various tractor models.

TUNE-UP

Essential tune-up specifications and data for engine maintenance.

SIZES-CAPACITIES-CLEARANCES

Key dimensions, capacities, and clearances for engine and component parts.

STEERING GEAR

REMOVE AND REINSTALL

Detailed steps for removing and reinstalling the steering gear unit.

OVERHAUL STEERING GEAR

Comprehensive instructions for overhauling the steering gear assembly.

R&R PUMP

OVERHAUL PUMP

All Models Except 1200 and Model 990 with 4;49 Engine

Detailed instructions for overhauling the hydraulic pump assembly.

R&R STEERING CYLINDER

OVERHAUL STEERING CYLINDER

R&R CYLINDER HEAD

All Diesel Models

Detailed instructions for removing and installing the cylinder head on diesel engines.

VALVE GAP ADJUSTMENT

R&R TIMING GEAR COVER

TIMING GEARS

All 3-Cylinder Engines

Details on timing marks and procedures for 3-cylinder engine timing gears.

CAMSHAFT AND BEARINGS

Models 990 and 1200

Instructions for removing the camshaft without removing the engine on Models 990 and 1200.

CONNECTING ROD AND PISTON ASSEMBLIES

CONNECTING RODS AND BEARINGS

PISTONS AND PISTON RINGS

CRANKSHAFT AND MAIN BEARINGS

All 3-Cylinder Models

Procedures for removing crankshaft and adjusting main bearings on 3-cylinder models.

GASOLINE FUEL SYSTEM

DIESEL FUEL SYSTEM

TROUBLESHOOTING

Troubleshooting guide for diesel engine starting and running issues.

BLEEDING FUEL SYSTEM

Model 990

Steps for bleeding the fuel system on Model 990.

COLD WEATHER STARTING AIDS

FUEL INJECTION PUMP

All 3-Cylinder Models

Procedure for removing and reinstalling the fuel injection pump on 3-cylinder models.

DIESEL GOVERNOR ADJUSTMENTS

FUEL INJECTORS

LOCATING A FAULTY NOZZLE

Method for identifying a faulty injector by engine operation.

REMOVE AND INSTALL INJECTORS

Procedure for removing and installing fuel injectors.

OVERHAUL

Detailed instructions for overhauling fuel injector assemblies.

NON-DIESEL GOVERNOR

WATER PUMP

IGNITION DISTRIBUTOR AND TIMING

SINGLE DISC CLUTCH

R&R CLUTCH

CLUTCH OVERHAUL

Models 770, 880 and 990

Detailed instructions for overhauling the clutch assembly.

DUAL LIVEDRIVE CLUTCH

R&R CLUTCH (Cont.)

OVERHAUL CLUTCH

TRANSMISSION

R&R TRANSMISSION ASSEMBLY

R&R Transmission From Rear

Procedure for removing the transmission by splitting the tractor.

OVERHAUL TRANSMISSION

Model 770

Detailed instructions for overhauling the transmission assembly on Model 770.

CREEPER DRIVE UNIT, 12-SPEED MODELS

MAIN DRIVE BEVEL GEARS AND DIFFERENTIAL

R&R DIFFERENTIAL ASSEMBLY

Procedure for removing the differential assembly.

ADJUST PINION MESH POSITION

Steps for adjusting the pinion mesh position on Model 1200.

ADJUST DIFFERENTIAL CARRIER BEARINGS AND BEVEL GEAR BACKLASH

LUBRICATION AND BREATHER

REAR AXLE HOUSING

BRAKES

ADJUSTMENT

Procedure for adjusting brake pedals and linkage.

R&R OR RENEW BRAKE DRUMS

BELT PULLEY

OVERHAUL (Cont.)

R&R POWER TAKE-OFF ASSEMBLY

HYDRAULIC SYSTEM OPERATING PRINCIPLES

DEPTH (DRAFT) CONTROL

Depth control is used to maintain desired operating depth...

Explanation of how depth control maintains implement operating depth.

HEIGHT (POSITION) CONTROL

Position control is used where hydraulic system lift linkage...

Explanation of height control for maintaining lift linkage position.

TRACTION CONTROL (T.C.U.)

Traction control is used with implements equipped with gage wheels...

Explanation of traction control for transferring implement weight.

DOUBLE ACTING TOP LINK

HYDRAULIC LINES AND FILTER

FLUID CONTROL VALVES

CONTROL VALVE

R&R AND OVERHAUL CONTROL MECHANISM

ROCKSHAFT AND SUPPORT LATCH

SYSTEM CHECKS AND ADJUSTMENTS

MODEL 770

TROUBLE SHOOTING

All Selectamatic Models

Troubleshooting common issues with the Selectamatic hydraulic system.

SYSTEM CHECKS AND ADJUSTMENTS (Cont.)

R&R AND OVERHAUL PUMP

R&R CONTROL VALVE ASSEMBLY

OVERHAUL CONTROL VALVE ASSEMBLY

All Models

Detailed instructions for overhauling the control valve assembly.

HYDRAULIC LINES AND FILTER

REMOTE (EXTERNAL) CONTROL VALVES

David Brown 990 Specifications

General IconGeneral
Engine TypeDiesel
Engine Displacement3.6 L
Transmission8-speed
Production Years1965-1971
Transmission Gears8 forward and 2 reverse

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