All 68 pages of this David Brown AD4/40V, AD4/40W, and 950 Implematic Operator Manual (OEM #DBT454) focus on one thing: keeping your diesel engined tractor running exactly as David Brown built it to run. Inside: a complete controls walkthrough, cold-start and anti-freeze procedures, full Implematic hydraulic lift operation for implements with or without a depth wheel, plus drawbar, differential lock, and external equipment setup. You also get a greasing chart, daily fluid checks, and a tiered maintenance schedule spanning 60, 120, 360, 480, and 960-1000 hour service intervals. Set valve clearance to 0.015 in. hot, top up the engine with 17 pints of oil, and confirm the oil pump relief valve opens at 40 lb/in² (2.8 kg/cm²). Your tractor is a tool; stop hunting forum threads for specs that are right here. Bookmarked by section so you jump straight to the Implematic chapter or the greasing chart without scrolling.
What's Inside This David Brown AD4/40V, AD4/40W, 950 Implematic & 950 Implematic Livedrive Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| On Receipt of the Tractor | 6 | Engine Controls, New Tractor Run-In, 50 Hours Service, Fluid Changes, Filter Cleaning, Valve Clearances, Cylinder Head Bolts |
| Operating the Tractor | 7-31 | Controls, Starting the Engine, Use of Anti-Freeze, Track Adjustments, Tyre Pressures, Lift Linkages and Check Chains, Drawbar, Lift Lock |
| Maintenance | 32-43 | Fuels, Greasing and Daily Checks, 60 and 120 Hour Servicing, 360, 480 and 960-1000 Hour Servicing |
| Servicing Information | 44-60 | Engine and Cooling System Servicing, Fuel System Servicing, Transmission and Electrical Servicing |
| Information and Data | 61-68 | Capacities, Extra Units for 950 Tractor, David Brown Implements and Farm Machinery |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil pump main relief valve setting | 40 lb/in² (2.8 kg/cm²) | p. 61 |
| Engine Lubricating Oil Capacity | 17 pints | p. 30 |
| Valve Clearance (hot) | 0.015 in. | p. 57 |
| Engine Capacity | 165 in³ | p. 61 |
| Drawbar Horsepower | 32 | p. 62 |
David Brown AD4/40V, AD4/40W, 950 Implematic & 950 Implematic Livedrive Common Problems This Manual Covers
David Brown 950 Implematic hydraulic lift arms rise to full height but won't hold position p. 37
Check hydraulic oil level at the sight glass daily before work; top up with correct UTTO oil if below the MIN mark. Replace the hydraulic filter every 60 hours per the schedule on page 37. Drain and refill if fluid appears dark or burnt. Confirm the lift control lever moves freely through its full range.
Manual Section: MaintenanceOil pressure warning light flickers or stays on when engine speed drops below 1,500 rpm p. 30
Stop immediately and check oil level; the engine takes 17 pints (page 30). Inspect the oil pressure sender wire for loose or corroded connections at the engine block. On AD4/40V and AD4/40W models, the relief valve opens at 40 lb/in² (2.8 kg/cm²); if the level is correct, have the sender tested before resuming work.
Manual Section: Operating the TractorEngine loses fuel prime and stalls after two or three hours of operation, restarts after priming p. 44
Inspect all fuel line connections from tank to lift pump for weeping seals or loose fittings. Clean the sediment bowl and verify the filler cap vent is clear; drain the bowl every 60 hours per the schedule on page 37. If the fault repeats after refitting, check the lift pump cover joint for hairline cracks causing intermittent air ingestion.
Manual Section: Servicing InformationEngine cranks but won't fire on cold mornings, excessive white smoke during start attempt p. 12
Engage the cold-start device before cranking, as described on page 12. Confirm the fuel tank holds winter-grade diesel rated for current temperatures. Prime the fuel system with the manual primer lever before cranking. Do not run the starter more than 30 seconds at a time; wait one full minute between attempts to prevent overheating.
Manual Section: Operating the TractorStarter motor clicks or spins freely but won't turn the engine over p. 7
Check battery terminals for corrosion and tighten the earth strap at the engine block. Verify the gear lever is in neutral before cranking. Inspect fuses per the wiring diagram on page 7. If the starter drags slowly below 0°C, a fully charged battery is required before diagnosing any further mechanical fault.
Manual Section: Operating the TractorFrequently Asked Questions
How do you fix hydraulic lift arms rise to full height but won't hold position?
Check hydraulic oil level at the sight glass daily before work; top up with correct UTTO oil if below the MIN mark. Replace the hydraulic filter every 60 hours per the schedule on page 37. Drain and refill if fluid appears dark or burnt. Confirm the lift control lever moves freely through its full range.
How do you fix oil pressure warning light flickers or stays on when engine speed drops below 1,500 rpm?
Stop immediately and check oil level; the engine takes 17 pints (page 30). Inspect the oil pressure sender wire for loose or corroded connections at the engine block. On AD4/40V and AD4/40W models, the relief valve opens at 40 lb/in² (2.8 kg/cm²); if the level is correct, have the sender tested before resuming work.
How do you fix engine losing fuel prime and stalling after two or three hours of operation?
Inspect all fuel line connections from tank to lift pump for weeping seals or loose fittings. Clean the sediment bowl and verify the filler cap vent is clear; drain the bowl every 60 hours per the schedule on page 37. If the fault repeats after refitting, check the lift pump cover joint for hairline cracks causing intermittent air ingestion.
How do you fix the engine cranking but not firing on cold mornings with excessive white smoke?
Engage the cold-start device before cranking, as described on page 12. Confirm the fuel tank holds winter-grade diesel rated for current temperatures. Prime the fuel system with the manual primer lever before cranking. Do not run the starter more than 30 seconds at a time; wait one full minute between attempts to prevent overheating.
How do you fix the starter motor clicking or spinning freely without turning over the engine?
Check battery terminals for corrosion and tighten the earth strap at the engine block. Verify the gear lever is in neutral before cranking. Inspect fuses per the wiring diagram on page 7. If the starter drags slowly below 0°C, a fully charged battery is required before diagnosing any further mechanical fault.
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