Home / Farm Tractors / Ford Tractors / Ford 3930

Ford 3930 Tractor Troubleshooting

The Ford 3930 utility tractor was manufactured from 1990 to 2002. The Ford 3930 tractor is powered by Ford vertical 3-cylinder direct injection liquid-cooled diesel engine. The 201 cubic inches (3.3 L) engine has a cylinder bore of 4.4" (112 mm), piston stroke of 4.4" (112 mm), and rated power of 51 hp (37.8 kW).

The Ford 3930 is fitted with 3 types of transmission. Type 1: 8x2 Dual-Range transmission. Type 2: 8x8 synchronized shuttle transmission. Type 3: Dual Power transmission with 16 forward and 8 reverse gears. The maximum forward speed - 18.5 mph (29.8 kph), maximum reverse speed - 8.9 mph (14.3 kph).

The open center hydraulic system used a pump with rated fluid flow of 7.7 gal/min (29.2 l/min). The hydraulic system pressure is 2500 psi (173 bar). The Ford 3930 was equipped with a power steering system, differential wet disc brakes, 6.00x15 front tires, and 13.6x28 rear tires. The wheel base is 84.5" (2140 mm) for models with 2WD and 84.1" (2130 mm) for models with 4WD.

Compatible attachments for the tractor: Ford 7210 loader with a maximum lift height of 124" (3140 mm), Ford 7310 loader with lift capacity to max height of 2685 lbs (1217 kg), or Ford 7410 loader with lift capacity to full height of 2500 lbs (1134 kg).

Engine Troubleshooting
Engine won't start or difficult to start
Fuel filter is dirty - Filter maintenance required
The fuel shut-off valve is closed - Open fuel shut-off valve
Air in fuel system - Air-bleed fuel system
Clogged or damaged injectors - Check fuel injectors and replace if required
Fuel injection pump is defective - Install a new fuel pump or repair
Low compression - Check cylinder block and replace worn parts
Engine stops during operation
Engine not warmed up - Normalize the engine temperature
Air in fuel pipes - Bleed fuel pipes
Bad fuel injection - Check and adjust
Fuel filter is clogged - Clean or replace the filter
Fuel injectors are defective or dirty - Service or change fuel injectors
Engine starts and stalls immediately
Fuel injection pump out of timing - Check the fuel injection pump timing setting
Clogged fuel filter element - Clean or change the filter
Fuel injector nozzles are clogged or faulty - Service or replace injector nozzles
Faulty fuel injection pump - Change pump or rebuild it
Air cleaner element is dirty - Service or change air cleaner
Engine stops while idle
Incorrectly adjusted low idle speed - Adjust low idling as recommended
Fuel injection pump failure - Repair or replace injection pump
Clogged or defective injector nozzles - Test injector nozzles and replace as required
Valve clearance is wrong - Adjust valve clearance
Engine overheated
Not enough coolant - Coolant needs to be refilled. Inspect the system for leaks
Cooling system components are defective or system is dirty - Change faulty components or flush the cooling system
Insufficient engine oil - Add oil to the engine crankcase
Broken fan belt or improper belt tension - Adjust correctly or change the belt
Defective thermostat - Check and change if necessary
Engine lacks power
Clogged fuel injectors - Change fuel injectors
Improper fuel injection pressure - Adjust to proper pressure
Air filter element clogging - Replace filter or install new filter element
Clogged oil filter element - Clean or replace engine oil filter element
Diesel engine overloaded - Load reducing is recommended
Excessive valve clearance - Adjust valve clearance
Low idle speed setting is not correct - Adjust as required
Dirt in the fuel pipes or hoses - Service fuel pipes and hoses
Low engine compression: Leaking or faulty valves - Valves need to be replaced
Engine noises or knocks
Timing of fuel injection pump is not adjusted - Adjust the fuel injection pump timing correctly
Fuel injector nozzles fault - Test injector nozzles and replace as required
Engine oil level low - Fill the crankcase with engine oil
Low coolant temperature - Warm up engine as required
Main bearings or crankshaft failure - Change or repair worn components
Piston rings are defective or broken - Replace the piston rings as required
Flywheel mounting screws are loose - Tighten the screws
Diesel engine using too much oil
Oil leaking: Gaskets or seals can be faulty - Install new components
Crankcase oil too light - Use correct viscosity oil
Piston rings are stuck or worn - Change piston rings
Worn valve stems and valve guides - Install new valves
Cylinder liners or pistons are scored - Check liners and pistons, replace as required

Electrical System Troubleshooting
Battery is not charging
Battery bad cell - Install a new battery
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Loose or corroded battery terminals and cables - Cables and terminals must be tightened or cleaned
Belt is worn or belt tension is incorrectly adjusted - Replace belt or correctly adjust belt tension
Starter turning slow
Low battery power - Recharge the battery
Battery is not holding charge - Service charging system or replace battery
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Loose or corroded battery terminals and cables - Tighten or clean cables and terminals
Starter will not work
Battery capacity is low - Battery is drained, recharge it
Drained or worn battery - Charge or replace the battery
Starter motor failing - Starter needs to be changed
Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly

Transmission Troubleshooting
Difficult to shift gears
Worn or misadjusted clutch - Adjust clutch or replace if required
Loose or broken gear shift linkage - Change defective shift linkage
Shift forks are worn or damaged - Change defective shift forks
Defective gearshift mechanism - Replace defective components
Low transmission oil pressure
Oil level is low - Fill the transmission housing to proper oil level
Clogged transmission oil filter (if equipped) - Change or service the transmission oil filter
Faulty relief valve - Replace relief valve as required
Transmission is excessively noisy
Broken or worn bearings - Bearings need to be changed
Oil level is low - Checking transmission oil level and add if necessary
Contaminated transmission oil - Transmission oil must be changed
Improper backlash or damaged gears - Replace gears or set backlash properly
Shift forks are worn or damaged - Shift forks need to be changed
Transmission oil leaks
Broken gaskets or seals - Replace worn seal or gaskets
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Hydraulic system overheats
Improper pressure in hydraulic system - Adjust properly
Main relief valve failure or incorrect setting - Adjust the valve or replace if necessary
Contaminated hydraulic oil - Change hydraulic oil
Aeration in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Hydraulic oil pressure is insufficient
Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid
Hydraulic oil filter element is dirty - Replace hydraulic filter element or service if necessary
Faulty hydraulic oil pump - Check the pump capacity and replace pump if required
Hydraulic control valve is faulty or out of adjustment - Adjust properly or replace
Hydraulic cylinder is faulty - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Leakage in hydraulic pipes - Inspect hydraulic system for leaks and repair it
Three-point hitch lifting is too slow or cannot be lifted
Lack of hydraulic fluid - Need to add fluid
Hydraulic fluid is too cold - Allow fluid to warm
Hydraulic fluid filter clogging - Change the hydraulic filter element or service if required
Hydraulic pump is faulty - Check the pump capacity and replace pump if required
Misadjusted or defective main relief valve - Adjust or change relief valve
Damaged or incorrect adjusted hydraulic spool valve - Replace or set properly
Broken hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Damaged or disconnected hydraulic suction pipe - Connect or replace the pipe
Hitch does not lower or lowers very slowly
Faulty or incorrect setting hydraulic spool valve - Change or adjust correctly
Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary
Worn lift arm shaft - Change the shaft
Internal mechanical failure of the hitch - Replace worn or defective hitch parts
Hitch jerks when drop or lift
Aeration in hydraulic system - Inspect the suction line, pump seals, and fittings
Dirty hydraulic oil - The oil must be changed
Hydraulic pump not working - Check pump capacity and change if necessary
Hydraulic control valve block is faulty or out of adjustment - Change or adjust properly
Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required

Steering System Troubleshooting
Stiff steering
Damaged or improperly installed steering column - Reinstall or replace the steering column
Air leaks in steering system - Bleed the steering system
Dirty steering filter element - Service steering filter
Not adjusted toe-in - Check toe-in and correct
Front tires are worn out - Install new tires
Steering pump malfunction - Install a new hydraulic steering pump
Worn or damaged power steering control unit - Inspect and replace as required
Relief valve is stuck or worn - Replace or service relief valve
Insufficient steering fluid - Fill up the steering fluid
Steering system oil leak - Retighten joints of the hydraulic steering pipes and hoses
Excessive play in steering
Steering column coupling or shaft is extremely worn out - Change defective component
Damaged or worn power steering control unit - Change or repair steering unit if required
Steering pump is faulty - Steering pump needs to be repaired or replaced
Worn or faulty steering linkage or tie-rod ends - Change damaged component
Tractor is pulling to left or right
Deflated front tyres - Inflate tyres as needed
Incorrect toe-in adjustment - Adjust toe-in wheels properly
Steering linkage or tie-rod ends are worn - Replace damaged part
Worn or defective power steering control unit - Repair or change the steering unit
Steering cylinder is defective - Replace or repair hydraulic steering cylinder
Defective or improperly adjusted front hub bearings - Adjust properly or change bearings




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