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Ford 4000SU Tractor Troubleshooting

The Ford 4000SU is a two-wheel drive special utility tractor. This model was manufactured between 1970 and 1976. The Ford 4000 SU tractor is equipped with a Ford 3-cylinder water cooled diesel engine with a rated power of 57 hp (42.5 kW), or vertical 3-cylinder gasoline engine with a rated power of 56 hp (41.5 kW).

The Dual-Range transmission consists of a dry clutch and gearbox with 8 forward and 2 reverse gears. Max. travel speed (forward/reverse): 15 mph (24.1 km/h) and 7.2 mph (11.6 km/h). The open center hydraulic system used a gear pump with a flow rate of 5.4 gal/min (20.8 l/min).

The hydraulic pressure is 173 bar (2500 psi). The Ford 4000SU was equipped with a power steering system, wet dics brakes, 7.50x15 or 7.50x16 front tires, and 14.9x28 or 16.9x24 rear tires. The wheel base is 77.3 inches (1960 mm).

Diesel Engine Troubleshooting
Engine will not start or difficult to start
Fuel filter is dirty - Change filter element
Fuel supply valve is closed - Open fuel supply valve
Fuel lines leaking air - Tighten clamps, change faulty pipes
Fuel injectors are defective or dirty - Service or change fuel injectors
Fuel injection pump malfunctioning - Repair or change injection pump
Poor cylinder compression - Check cylinder block and change worn components
Engine stops unexpectedly while running
Engine is not warmed up to required temperature - Normalize the engine temperature
Air trapped in fuel system - Bleed air
Irregular fuel injection - Adjust fuel injection timing
Plugged fuel filter - Filter maintenance required
Dirty or damaged injectors - Clean or replace fuel injectors
Diesel starts and immediately shuts off
Unadjusted fuel injection pump timing - Repair or replace fuel injection pump
Clogged fuel filter element - Clean the filter element
Fuel injector nozzles are damaged - Check and change nozzles as required
Defective fuel injection pump - Repair or replace injection pump
Clogged air cleaner - Air cleaner maintenance required
Engine stalls at idle
Improperly adjusted low idle speed - Correct low idle adjustment
Faulty fuel injection pump - Replace or repair injection pump
Fuel injector nozzles are defective or dirty - Change or clean injector nozzles
The valve clearance is not adjusted - Have it adjusted
Engine overheating
Coolant level is low - The cooling system needs to be refilled. Check radiator and hoses for leaks
Cooling system components are failed or system is dirty - Change faulty components or service cooling system
Engine oil level is insufficient - Fill the crankcase with engine oil
Incorrect fan belt tension or broken belt - Adjust belt tension correctly or change it
Thermostat fault - Check thermostat, replace if necessary
Engine power is reduced
Fuel injectors are defective or dirty - Clean or replace fuel injectors
Fuel injection pressure is incorrect - Adjust pressure to proper level
Air filter clogging - Change or service air filter element
Dirty oil filter element - Service or change engine oil filter element
Engine overload - Reduce the load or operate the tractor in lower gears
The valve clearance is not adjusted - Need to adjust valve clearance
Incorrect low idle speed adjustment - Adjust the low idle speed
Dirt in the fuel pipes or hoses - Fuel pipes and hoses need to be cleaned
Engine compression is insufficient: Valves are damaged or leaking - Install new valves
Engine noises or knocks
Fuel injection pump timing is incorrect - Check and correct settings
Dirty or defective injector nozzles - Install new set of properly balanced nozzles
Engine oil level is low - Fill up the oil to required level
Engine has not warmed up to recommended temperature - Normalize the engine temperature
Main bearings or crankshaft are worn out - Change defective components as required
Piston rings are damaged or broken - Replace piston rings
Flywheel screws are loose - Tighten the screws firmly
Excessive engine oil consumption
External oil leaks: Worn gaskets or seals - Change worn parts according to specifications
Incorrect oil viscosity - Fill up with the correct oil viscosity
Piston rings are stuck or broken - Replace piston rings
Damaged valve stems or valve guides - Replace the valves
Cylinder liners or pistons are scuffed - Check pistons and liners, replace as required

Electrical System Troubleshooting
Battery does not charge
Battery dead cell - Battery change required
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Corroded or loose battery terminals and cables - Service or tighten battery cables and terminals
Belt wear or improper belt tension adjustment - Change belt or correctly adjust belt tension
Starter motor turns slow
Low battery output voltage - Battery is drained, recharge it
Battery discharges quickly - Battery needs service or replacement
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Battery cables and terminals are loose or corroded - Service or tighten battery terminals and cables
Starter will not crank
Low battery output - Battery needs to be recharged
Drained or faulty battery - Need to charge or replace the battery
Starter motor is defective - Starter should be replaced
Incorrectly connected or disconnected wires - Check battery wires and connect correctly

Transmission Troubleshooting
Gear hard to shift
Worn or misadjusted clutch - Clutch needs to be adjusted or changed
Gear shift linkage is stuck or worn - Replace or repair the shift linkage
Damaged or worn shift forks - Shift forks need to be replaced
Faulty gear shifting mechanism - Faulty parts must be changed
Transmission oil pressure is low
Oil level is insufficient - Add transmission oil as required
Transmission oil filter element is dirty (if fitted) - Replace or service transmission oil filter
Relief valve is defective - Change relief valve
Excessive transmission noise
Cracked or worn bearings - Replace the bearings
Insufficient oil supply - Fill up the transmission oil
Dirty transmission oil - Fill up with fresh transmission oil
Backlash is incorrect or gears are worn - Change the gears or adjust backlash correctly
Worn or damaged shift forks - Change the shift forks
Transmission fluid leakage
Gaskets or seals are broken - Install new components
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Hydraulic system is too hot
Hydraulic system pressure is not corrected - The pressure must be adjusted correctly
Main relief valve is defective or unadjusted - Adjust relief valve or change if required
Hydraulic oil contamination - Change the oil
Air leaks in hydraulic system - Check the pump seals, suction line, and fittings
Low hydraulic system pressure
Lack of hydraulic oil - Add oil to the hydraulic system
Hydraulic fluid filter element clogging - Replace filter element or clean if required
Defective hydraulic pump - Flow-rate hydraulic pump and replace pump if necessary
Hydraulic spool valve is defective or set improper - Adjust correctly or change
Defective hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Hydraulic pipes are leaking - Find leaks in the system and fix it
Hitch fails to lift or lifts slowly
Hydraulic oil level is insufficient - Add oil to the hydraulic system
Cold oil in hydraulic system - Wait for oil to warm up
Dirty hydraulic oil filter - Service or replace the hydraulic filter
Faulty hydraulic oil pump - Test the pump performance and change pump if required
Main relief valve malfunction or incorrect adjustment - Set up or change the relief valve
Hydraulic spool valve block is defective or set improper - Replace or set correctly
Faulty hydraulic cylinder - Check the hydraulic cylinder components for damage or wear and change if necessary
Damaged or loose suction line - Tighten or change
Hitch drops too slowly or can't drop
Hydraulic control valve is not set properly or defective - Adjust properly or change
Hydraulic cylinder is broken - Inspect cylinder components for wear or damage and change if required
Damaged hitch rock shaft - Install a new shaft
The hitch has internal mechanical malfunctions - Replace worn or damaged hitch components
Three-point hitch raises or lowers not smoothly
Air in hydraulic system - Inspect the pump seals, suction line, and fittings
Hydraulic oil contamination - Change the oil
Faulty hydraulic oil pump - Flow-rate hydraulic pump and replace pump if necessary
Faulty or incorrect setting hydraulic control valve - Adjust properly or replace
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary

Steering System Troubleshooting
Hard Steering
Steering column is worn or incorrectly mounted - Change the steering column or mount it correctly
Aeration in steering system - Bleed air
Steering filter is plugged - Service steering filter
Improper toe-in adjustment - Adjust toe-in wheels properly
Tires are incorrectly inflated - Inflate as required
Steering pump stopped working - Steering pump needs to be replaced or repaired
Steering cylinder has wear or malfunction - Inspect and change as required
Damaged steering gearbox parts - Defective power steering box components must be replaced
Lack of steering fluid - Need to add steering oil
Oil leaks in the steering system - Tighten the steering hose and pipe joints
Excessive free play of steering wheel
Steering column shaft or coupling has maximum wear - Replace defective component
Faulty or worn steering cylinder - Replace or repair steering cylinder as required
Damaged steering gear box parts - Repair power steering gearbox
Steering pump stopped working - Install a new hydraulic steering pump
Steering tie-rod ends or linkage are defective - Change failed component
Tractor pulls to right or left
Tire pressure is low - Tires need to be inflated
Incorrect toe-in - Adjust toe-in correctly
Worn or faulty steering tie-rod ends or linkage - Change damaged part
Faulty steering gear box components - Change defective steering gear box components
Damaged steering cylinder - Repair or change hydraulic steering cylinder
Front hub bearings are incorrectly adjusted or worn - Adjust correctly or install new 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