Do you have a question about the David Brown 990 and is the answer not in the manual?
Details and specifications for the engine, continuing from previous sections.
Step-by-step guide for removing and reinstalling the engine assembly.
Specific procedures for engine removal and installation on models 880 and 4600.
Steps for adjusting the hydraulic lift system for optimal performance.
Procedure for bleeding the power steering system and checking fluid levels.
Guidance on checking power steering system pressure for proper function.
Procedures for removing and installing the transmission assembly.
General specifications and data for various tractor models.
Essential tune-up specifications and data for engine maintenance.
Key dimensions, capacities, and clearances for engine and component parts.
Detailed steps for removing and reinstalling the steering gear unit.
Comprehensive instructions for overhauling the steering gear assembly.
Detailed instructions for overhauling the hydraulic pump assembly.
Detailed instructions for removing and installing the cylinder head on diesel engines.
Details on timing marks and procedures for 3-cylinder engine timing gears.
Instructions for removing the camshaft without removing the engine on Models 990 and 1200.
Procedures for removing crankshaft and adjusting main bearings on 3-cylinder models.
Troubleshooting guide for diesel engine starting and running issues.
Steps for bleeding the fuel system on Model 990.
Procedure for removing and reinstalling the fuel injection pump on 3-cylinder models.
Method for identifying a faulty injector by engine operation.
Procedure for removing and installing fuel injectors.
Detailed instructions for overhauling fuel injector assemblies.
Detailed instructions for overhauling the clutch assembly.
Procedure for removing the transmission by splitting the tractor.
Detailed instructions for overhauling the transmission assembly on Model 770.
Procedure for removing the differential assembly.
Steps for adjusting the pinion mesh position on Model 1200.
Procedure for adjusting brake pedals and linkage.
Explanation of how depth control maintains implement operating depth.
Explanation of height control for maintaining lift linkage position.
Explanation of traction control for transferring implement weight.
Troubleshooting common issues with the Selectamatic hydraulic system.
Detailed instructions for overhauling the control valve assembly.
| Engine Type | Diesel |
|---|---|
| Engine Displacement | 3.6 L |
| Transmission | 8-speed |
| Production Years | 1965-1971 |
| Transmission Gears | 8 forward and 2 reverse |