Need the factory owner's reference for your David Brown 990, 995, or 996? This 152-page operator manual (OEM #9-5101) is your complete field guide to all three tractors: instrument panel, Synchromesh transmission, Selectamatic hydraulic system, and every daily check in between. You get hydraulic schematics covering depth control, height control, and 3-way valve operation, plus wiring diagrams, a full maintenance schedule with routine service task tables, and operating procedures for gear selection, differential lock, PTO, and cold-weather starting. Travel speed tables for 10/49, 11/49, and 9/50 final drive ratios round out the Specification and Data section. Change engine oil every 125 hours, renew the filter at 250. Your tractor's down. Bookmarked by section; search any term on laptop, tablet, or phone and get straight back to it.
What's Inside This David Brown 990, 995, 996 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Points | 2-4 | Safety Warnings and Operating Precautions |
| Serial Numbers | 5-9 | Serial Number Locations and Recording |
| Take Special Care of Your New Tractor | 10 | Initial Operation Guidelines, First Service (50/100 Hours) |
| Description and Operation -General | 15-30 | Instrument Panel, Levers and Pedals, Synchromesh Transmission, Starting and Stopping Engine, Seat Adjustment |
| Description and Operation | 31-48 | Selector Dial Pointer, Hand Lever, Sensing Unit, Depth Control, Height Control, 3-Way Valve |
| Section 3 ~ Adjustments and Settings | 49-64 | Linkage Settings (Stabilisers, Slotted Lift Rods, Drawbar, Pick-Up Hitch) |
| Regular Maintenance | 65-80 | Introduction, Table of Routine Service Tasks, Lubrication Chart, Fuel, Grease and Anti-Freeze Specifications, Approved Lubricants |
| Servicing Information | 81-116 | Introduction, Removal of the Bonnet |
| Specification and Data | 117-152 | Diesel Engine, Chassis, Lighting Equipment, Travel Speed Tables - 10/49 Final Drives, Travel Speed Tables - 11/49 Final Drives, Travel Speed Tables - 9/50 Final Drives, Accessories |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel filter element replacement interval (first element) | 50 - 100 hours | p. 88 |
| Fuel filter element replacement interval (general, under good conditions) | at least 600 hours | p. 88 |
| Engine oil change interval | Every 125 hours | p. 72 |
| Engine oil filter renewal interval | Every 250 hours | p. 73 |
| Transmission hydraulic filter replacement interval (first service) | 50/100 hour service | p. 99 |
| Transmission hydraulic filter replacement interval (subsequent) | Every 500 hours | p. 99 |
| Final drive oil change interval | Every 1000 hours | p. 75 |
| Final drive oil capacity (each) | 2.3 litre | p. 123 |
| Wire mesh and magnetic filter (transmission) cleaning interval | Every 500 hours | p. 74 |
| First Service Interval | 50-100 hours | p. 88 |
| Hydraulic Filter Service Interval (subsequent) | 500 hours | p. 99 |
| Transmission Oil Capacity | 5 gal (22.7 litre) | p. 123 |
David Brown 990, 995, 996 Common Problems This Manual Covers
David Brown 990 transmission filter warning light illuminates at high RPM after engine warms up p. 28
Check the warning light guide on page 28. Replace the transmission gearbox paper filter element; the first change is due at the 50/100 hour service, with subsequent replacements every 500 hours (page 99). A clogged filter restricts oil flow at high RPM and triggers the warning. Clean the wire mesh and magnetic filter at the same 500-hour interval.
Manual Section: Description and Operation -GeneralEngine oil warning light stays on after startup, oil level showing normal on dipstick p. 28
Check the oil level on a level surface with the engine off for at least 5 minutes before reading the dipstick. If level is correct, refer to the warning light troubleshooting guide on page 28. Service the engine oil every 125 hours (page 72) and the filter every 250 hours (page 73) to prevent sender fouling and false warnings.
Manual Section: Description and Operation -GeneralSelectamatic hydraulic implement lift sluggish, implements won't hold position or respond slowly p. 36
Verify the Selector Dial Pointer and Hand Lever settings for your implement using the operating guide on page 36. Check hydraulic fluid level, then inspect the filter element (page 99); replace every 500 hours to keep pump delivery at 5 gal/min (22.7 litres/min). A restricted filter is the most common cause of slow or erratic implement response.
Manual Section: Description and OperationEngine burning excessive oil with blue smoke from exhaust during light work p. 72
Increase engine load by downshifting if you notice blue smoke during light work, as prolonged low-RPM operation glazes cylinder walls. Check engine oil level at each daily service and maintain the 125-hour oil change interval (page 72). If consumption exceeds normal, confirm the oil filter is renewed every 250 hours (page 73). Total oil capacity is 7.4 litres (page 123).
Manual Section: Regular MaintenanceEngine struggles and overheats when pulling heavy implements, losing power on slopes p. 86
Downshift before the engine begins to labor; never let RPM drop to the point where you lose implement control. Check fan belt deflection: correct tension is 3/8 in (10mm) under finger pressure on the drive side pulley (page 86). Clear debris from the radiator grille and verify coolant level before starting heavy work.
Manual Section: Regular MaintenanceEngine won't start or takes over 25 seconds cranking in cold weather p. 28
Follow the cold start procedure on page 28 and limit each crank attempt to 25 seconds maximum. If the engine fired recently and has now stopped, air in the fuel system may be the cause, especially after a filter change or running the tank dry. Replace the fuel filter element every 100 hours under poor conditions (page 88).
Manual Section: Description and Operation -GeneralFrequently Asked Questions
How to reset the clutch on a David Brown 990?
For the David Brown 990 (not 996), the clutch free-play should be checked frequently and adjusted if necessary, ensuring it does not fall below 1 inch (25mm). If an overload release is fitted, slacken the lock-nut on the rod to the hand lever to give 1/4 inch (6mm) clearance, and adjust bolt A to give 1 1/2 inch (38mm) free movement of the clutch pedal.
What are the torque specs for the engine bolts on a David Brown 995?
The cylinder head bolts on a David Brown 995 should be tightened using a torque wrench set at 90 lb ft (12.5kg m). After tightening, the valve clearances must be checked.
What are the replacement specifications for Fuel filter element?
The fuel filter elements should be changed at regular intervals, with a life of at least 600 hours if clean fuel is used from a tank. However, with barrel storage and contamination, the life can be reduced to 100 hours, and the first element must be renewed at the first service (50 - 100 hours).
What are the replacement specifications for Engine oil and filter element?
The engine oil should be changed every 125 hours under normal conditions, while the engine oil filter element should be renewed every 250 hours. Both procedures should be performed when the engine is hot for easier draining.
How quickly can I access this manual after buying?
Immediate download of the complete 152-page searchable Operator Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this David Brown 990, 995, 996 Operator Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Does this David Brown 990, 995, 996 manual include hydraulic schematics?
Included. A hydraulic system diagram shows the main hydraulic layout for the David Brown 990, 995, 996.
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