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Ford 3910 Tractor Troubleshooting

The Ford 3910 is a 2-wheel drive or 4-wheel drive utility tractor from 10-series. This model was manufactured between 1983 and 1989. The 3910 tractor is powered by Ford vertical 3-cylinder direct injection diesel engine with a max output power of 50 Hp (37.3 kW) and 187 Nm (138 lb-ft) of max torque at 1400 rpm.

The Ford 3910 is fitted with three transmission options: 8x2 Dual-range transmission, 8x4 synchromesh gear transmission, and 6x4 mechanical shuttle transmission. Max. forward speed - 18.5 mph (29.8 kph), max. reverse speed - 16.1 mph (25.9 kph).

The open center hydraulic system used a gear pump with rated fluid flow of 7.7 gpm (29.2 lpm). The hydraulic pressure is 173 bar (2500 psi). The 4x2 models are equipped with 7.50x15 front tyres and 13.6x28 rear tyres. The 9.5x24 front tyres and 14.9x28 rear tyres fit 4x4 tractors. The wheelbase is 77.5" (1960 mm) for 2WD models and 84.1" (2130 mm) for 4WD models. The 3910 tractor is compatible with Ford 776A front end loader with a maximum lift height of 124" (3140 mm) and lifting capacity of 2500 lbs (1134 kg).

Engine Troubleshooting
Engine doesn't start or difficult to start
Clogged fuel filter element - Clean or replace the filter
No fuel injection - Open fuel cock to inject fuel
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Dirty or faulty injectors - Change fuel injectors
Defective fuel injection pump - Install a new pump or rebuild
Bad engine compression - Inspect cylinder block and replace worn components
Engine stops running while driving
Engine is not preheated - Warm up the engine
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Improper fuel injection - Fuel injection settings required
Fuel filter is dirty - Install new filter element
Dirty or faulty injectors - Check fuel injectors and replace if required
Engine starts and stops
Incorrect setting of fuel injection pump timing - Correct injection timing
Plugged fuel filter - Clean or replace the filter
Fuel injector nozzles are defective or dirty - Install a new set of well-balanced nozzles
Fuel injection pump malfunctioning - Install a new pump or rebuild
Dirty air cleaner element - Replace or clean the air cleaner element
Engine shuts off while idling
Low idle speed setting is incorrect - Adjust as required
Defective fuel injection pump - Rebuild or install a new injection pump
Faulty fuel injector nozzles - Service or replace injector nozzles
Improper valve clearance - Correct valve clearance needs to be set
Engine overheats
Insufficient coolant fluid - Refill to the correct level. Check the components of cooling system
Cooling system parts are defective or system is clogged - Service the cooling system or replace faulty components
Not enough engine oil - Check and refill engine oil
Fan belt tension is unadjusted or belt is worn - Adjust properly or replace the belt
Thermostat is defective - Check and replace if required
Diesel power loss
Fuel injectors are damaged or dirty - Inspect fuel injectors and replace if necessary
Fuel injection pressure is wrong - Adjust pressure to proper level
Clogged air filter - Air filter maintenance required
Oil filter element clogging - Change or service engine oil filter
Engine is running overloaded - Reduce engine load
Valve clearance is wrong - Adjust to proper valve clearance
Low idle speed setting is incorrect - Normalize low idle speed
Fuel hoses or pipes clogging - Clean fuel system hoses and pipes
Lack of compression: Valves are faulty or leaking - Replace the valves as required
Abnormal engine noise or knocking
Unadjusted fuel injection pump timing - Check the fuel injection pump timing setting
Fuel injector nozzles are dirty or defective - Inspect injector nozzles and change if required
Not enough engine oil - Add oil to the engine crankcase
Engine is not fully warmed up - Warm up the engine
Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced
Worn or broken piston rings - Install new piston rings
Loose flywheel screws - Inspect the flywheel screws and tighten securely
Excessive engine oil consumption
Oil leaks: Seals or gaskets are wearing excessively - To repair leaks, replace worn parts
Wrong oil viscosity - Use proper viscosity oil
Worn or broken piston rings - Replace piston rings
Worn valve guides and valve stems - Valves need to be changed
Pistons or cylinder liners are damaged - Inspect liners and pistons, replace as necessary

Electrical System Troubleshooting
Battery won’t charge
Battery is worn - Battery replacement required
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Corroded or loose terminals and cables - Service or tighten battery terminals and cables
Belt slipping or wrong belt tension adjustment - Replace belt or adjust belt tension correctly
Starter cranks slow
Low battery voltage - Low battery charging, charge as required
Battery runs out quickly - Service charging system or install new battery
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Battery terminals and cables are corroded or loose - Clean or tighten cables and terminals
Starter motor is not working
Low battery capacity - Battery is drained, charge it
Discharged or defective battery - Battery needs to be recharged or replaced
Faulty starter motor - Starter needs to be changed
Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly

Transmission Troubleshooting
Hard to shift gears
Incorrectly adjusted or damaged clutch - Adjust correctly or replace
Gear shift linkage is damaged or loose - Change or repair shift linkage
Bent or worn shift forks - Replace defective shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Low transmission oil pressure
Insufficient fluid supply - Check and refill the transmission fluid
Plugged transmission fluid filter (if equipped) - Change or clean the transmission fluid filter
Relief valve sticking - Install a new valve
Transmission makes excessive noise
Bearings are worn or broken - Faulty bearings should be changed
Lack of transmission fluid supply - Add transmission fluid as required
Contaminated transmission fluid - Fill up with fresh transmission fluid
Damaged gears or improper backlash - Change worn gears or set backlash correctly
Shift forks are damaged or worn - Replace defective shift forks
External oil leaks
Seals or gaskets are damaged - Seals and gaskets replacement required
Transmission case is cracked - Replace case or transmission assembly

Hydraulics Troubleshooting
Excessive hydraulic system heat
Incorrect pressure in hydraulic system - Changing the system pressure
Defective or misadjusted main relief valve - Replace or set up the relief valve
Contaminated hydraulic fluid - Change hydraulic fluid
Air enters in hydraulic system - Inspect the pump seals, suction line, and fittings
Hydraulic oil pressure too low
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required
Dirty hydraulic oil filter - Service or replace the hydraulic filter
Damaged hydraulic oil pump - Flow-rate pump and change pump if necessary
Hydraulic control valve block is not set properly or defective - Replace or adjust correctly
Faulty hydraulic cylinder - Check the hydraulic cylinder components for damage or wear and change if necessary
Hydraulic lines are leaking - Detect leaks in hydraulic system and repair it
3-point hitch lifts slowly or won't lift
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter element clogging - Clean the hydraulic filter element or replace if necessary
Hydraulic pump not working - Check pump flow and install new pump if necessary
Defective or misadjusted main relief valve - Adjust the valve or replace if necessary
Defective or not adjusted hydraulic spool valve - Change or adjust properly
Hydraulic cylinder failure - Inspect cylinder components for wear or damage and change if required
Suction pipe is broken or loose - Tighten the pipe or replace it
3-point hitch fails to drop or drops slowly
Hydraulic spool valve is not set properly or defective - Replace or set properly
Hydraulic cylinder is defective - Check cylinder parts for wear or damage and replace if necessary
Hitch rock shaft is damaged - Replace the shaft
The hitch has mechanical faults - Change defective or worn hitch parts
Hitch is lowered or raised jerkily
Air trapped in the hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Damaged hydraulic oil pump - Check hydraulic pump flow and replace pump if necessary
Hydraulic control valve is defective or set improper - Change or adjust correctly
Hydraulic cylinder is not working - Inspect the cylinder components for damage or wear and change if required

Steering System Troubleshooting
Steering is difficult
Worn or improperly mounted steering column - Mount the steering column properly or change it
Air trapped in the steering system - Bleed the system of air
Clogged steering filter element - Steering filter maintenance required
Improper toe-in - Adjust toe-in correctly
Deflated front tyres - Inflate tyres as needed
Damaged hydraulic steering pump - Check the hydraulic steering pump and change if necessary
Defective or worn steering cylinder - Repair or replace the steering cylinder
Worn steering gear box components - Replace defective components of power steering gearbox
Relief valve is seized or defective - Inspect relief valve and replace if necessary
Steering fluid level is insufficient - Add oil to steering system
Steering system oil leakage - Retighten steering pipe and hose connections
Steering wheel has too much free-play
Worn steering column coupling or shaft - Change defective part
Steering cylinder is worn or defective - Repair or replace the steering cylinder
Worn steering box components - Change defective steering box parts
Worn steering pump - Check the hydraulic steering pump and change if necessary
Faulty or worn steering linkage or tie-rod ends - Replace failed part
Tractor is pulling to right or left
Improper tire pressure - Check the pressure and inflate tires as required
Toe-in adjustment is incorrect - Adjust toe-in properly
Steering tie-rod ends or linkage are worn - Change failed component
Faulty steering box parts - Repair power steering gearbox
Faulty steering cylinder - Repair or replace hydraulic steering cylinder
Front hub bearings are defective or improperly adjusted - Install new bearings or adjust it correctly




Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294