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Ford 6640 Tractor Troubleshooting
The
Ford 6640 is a Powerstar 40 series utility tractor. This model was manufactured
between 1991 and 1995. The Ford 6640 tractor is powered by 304 cubic inches (5
L) Ford Genesis four stroke 4-cylinder liquid-cooled diesel engine with a
maximum power of 85 hp (62.5 kw) at 2200 rev/min.
The Ford 6640 is fitted with 4 transmission options: 8x2 EconoShift
constant mesh transmission, 16x4 Dual power transmission, 12x12 Synchro
shift transmission, and 16x16 Pulse command transmission. The maximum
travel speed (forward/reverse): 19.2 mph (30.9 kph).
The open center hydraulic system includes a gear pump with rated fluid
flow of 9.6 gpm (36.8 lpm). The hydraulic system pressure is 176 bar
(2550 psi). The Ford 6640 is equipped with 7.50x16 front tyres and
16.9x30 rear tyres. The wheel base is 92.1" (2340 mm) for models with
2WD (4x2), and 93" (2360 mm) for models with 4WD (4x4).
| Engine Troubleshooting |
| Diesel will not start or hard to start |
| Dirty fuel filter element - Clean or change the filter |
| Fuel shut-off valve closed - Open the fuel shut-off valve |
| Air in fuel lines - Bleed fuel lines |
| Clogged or damaged injectors - Check fuel injectors and replace if required |
| Faulty fuel injection pump - Replace injection pump or repair it |
| Low compression - Check and change damaged parts |
| Diesel stalls while running |
| Engine not warmed up - Warm up the engine |
| Air trapped in fuel system - Bleed air |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter is dirty - Change the filter element |
| Fuel injectors are clogged or faulty - Check fuel injectors and replace if required |
| Diesel starts but then shuts off |
| Fuel injection pump timing is incorrect - Check and correct adjustments |
| Fuel filter is clogged - Change the filter element |
| Fuel injector nozzles are dirty or defective - Change injector nozzles |
| Fuel injection pump malfunctioning - Change or repair the pump |
| Clogged air cleaner - Change or service air cleaner element |
| Engine stalls at low idle speed |
| Incorrectly set low idle speed - Correct the settings |
| Damaged fuel injection pump - Rebuild or change fuel pump |
| Fuel injector nozzles are clogged or faulty - Replace fuel injector nozzles |
| Incorrect valve clearance - Adjustment procedure required |
| Insufficient coolant fluid - Coolant needs to be refilled. Check the components of cooling system |
| Cooling system is clogged or cooling parts are worn - Replace faulty parts or service cooling system |
| Lack of engine oil - Fill up the oil to required level |
| Fan belt is defective or belt tension is not adjusted - Replace or adjust belt tension properly |
| Defective thermostat - Test thermostat opening temperature, replace as required |
| Diesel engine loses power |
| Faulty or dirty injectors - Check fuel injectors and replace if required |
| Fuel injection pressure is wrong - Adjust to proper pressure |
| Air filter element clogging - Service or replace the air filter |
| Dirty oil filter - Service or change engine oil filter element |
| Engine overload - Reduce the load or operate the tractor in lower gears |
| Improper valve clearance - Adjust valve clearance according to specifications |
| Low idle speed adjustment is incorrect - Correct low idle settings |
| Dirty fuel hoses or pipes - Clean fuel hoses and pipes |
| Low engine compression: Valves are broken or leaking - Replace the valves as required |
| Abnormal engine knocking or noise |
| Fuel injection pump timing is incorrect - Fuel pump timing settings need to be corrected |
| Fuel injector nozzles fault - Change or clean injector nozzles |
| Low engine oil level - Fill up the oil to required level |
| Engine is not fully warmed up - Normalize the engine temperature |
| Worn crankshaft or main bearings - Repair or replace defective parts |
| Broken or worn piston rings - Replace the piston rings as required |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Oil leaks: Defective seals or gaskets - Install new components |
| Oil viscosity is incorrect - Use oil of correct viscosity |
| Worn or stuck piston rings - Replace piston rings |
| Valve stems and guides are worn - Change the valves |
| Scuffed pistons or cylinder liners - Check liners and pistons, install new components as required |
| Electrical System Troubleshooting |
| Battery does not charge |
| Battery is defective - Battery change required |
| Damaged battery wiring harness - Inspect wiring for damage, replace or repair |
| Corroded or loose cables and terminals - Tighten or clean terminals and cables |
| Belt damage or incorrect belt tension adjustment - Replace belt or properly adjust belt tension |
| Low battery voltage - Battery is drained, recharge it |
| Battery is not holding charge - Service battery or change it |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded terminals and cables - Service or tighten battery terminals and cables |
| Low battery power - Charge the battery |
| Discharged or faulty battery - Recharge or change battery |
| Defective starter motor - Repair or replace starter |
| Wiring is improperly connected or disconnected - Need to reconnect the wiring properly |
| Transmission Troubleshooting |
| Gear shift is hard |
| Clutch is unadjusted or worn - Adjust correctly or replace |
| Damaged or loose gear shift linkage - Change defective shift linkage |
| Damaged or worn shift forks - Change the shift forks |
| Worn gear shift mechanism - Replace worn components |
| Transmission fluid pressure is insufficient |
| Oil level is low - Correct the transmission oil level |
| Transmission fluid filter is dirty (if equipped) - Change or clean the transmission fluid filter |
| Relief valve failure - Install a new valve |
| Excessive transmission noise |
| Damaged or worn bearings - Install new bearings |
| Oil level is insufficient - Fill the transmission housing to proper oil level |
| Contaminated transmission fluid - Fill up with fresh transmission fluid |
| Defective gears or incorrect backlash - Replace gears or set backlash properly |
| Shift forks are damaged or worn - Change defective shift forks |
| Gaskets or seals are defective Install new components |
| Transmission case is cracked - Replace case or transmission assembly |
| Hydraulics Troubleshooting |
| Hydraulic system overheated |
| Incorrect hydraulic system pressure setting - Change the pressure settings |
| Faulty or incorrectly adjusted main relief valve - Adjust relief valve or change if required |
| Dirty hydraulic fluid - The fluid must be changed |
| Air in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Hydraulic oil pressure is insufficient |
| Not enough hydraulic fluid in the system - Need to add fluid |
| Hydraulic oil filter element clogging - Install a new hydraulic filter element |
| Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary |
| Defective or incorrect setting hydraulic control valve block - Adjust properly or change |
| Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required |
| Hydraulic pipes are leaking - Identify leaks in the system and repair it |
| 3-point hitch lifts too slowly or can't lift |
| Lack of hydraulic oil - Add oil to the hydraulic system |
| Hydraulic oil is too cold - Allow oil to warm |
| Dirty hydraulic oil filter - Hydraulic filter maintenance required |
| Hydraulic pump malfunction - Check pump flow and install new pump if necessary |
| Defective or misadjusted main relief valve - Adjust or replace the relief valve |
| Hydraulic control valve block is not set properly or defective - Set correctly or replace |
| Hydraulic cylinder is faulty - Inspect cylinder parts for wear or damage and replace if required |
| Damaged or loose suction line - Tighten or change |
| Hitch does not lower or lowers very slowly |
| Hydraulic spool valve is not set properly or defective - Set properly or replace |
| Broken hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required |
| Lift arm shaft is damaged - Install a new shaft |
| The hitch has any internal mechanical damage - Replace faulty or worn hitch parts |
| Hitch jerks when drop or lift |
| Air in hydraulic system - Check the suction line, pump seals, and fittings |
| Hydraulic oil is dirty - Hydraulic oil change required |
| Hydraulic pump failure - Test the pump flow rate and install new pump if required |
| Hydraulic control valve is defective or set improper - Replace or set properly |
| Hydraulic cylinder is defective - Check the cylinder components for damage or wear and change if necessary |
| Steering System Troubleshooting |
| Steering wheel is hard to turn |
| Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced |
| Air enters in steering system - Bleed air |
| Steering filter clogging - Clean steering filter element |
| Improper toe-in adjustment - Adjust toe-in properly |
| Tires are not correctly inflated - Inflate tires as necessary |
| Steering pump is worn - Repair or change steering pump |
| Damaged or worn power steering control unit - Inspect and replace as required |
| Faulty or stuck relief valve - Service or replace the relief valve |
| Low steering oil level - Fill up the steering oil |
| Steering system oil leak - Tighten joints of hydraulic pipes and hoses in steering system |
| Steering wheel has too much free-play |
| Steering column coupling or shaft is extremely worn out - Change faulty component |
| Worn or defective power steering control unit - Replace or repair steering unit as required |
| Steering pump stopped working - Repair or replace steering pump |
| Worn or faulty steering tie-rod ends or linkage - Change damaged part |
| Tractor pulls to left or right |
| Tire pressure is improper - Inflate the tires properly |
| Incorrect toe-in - Adjust toe-in correctly |
| Steering tie-rod ends or linkage are defective - Change failed component |
| Power steering control unit is defective or worn - Repair or change the steering unit |
| Defective steering cylinder - Repair or change hydraulic steering cylinder |
| Improperly adjusted or worn front hub bearings - Adjust correctly or change bearings |
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| Farm Tractors Technical Specifications |
