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John Deere 2640 Troubleshooting

The John Deere 2640 is a 2040-series utility tractor. This model was manufactured from 1976 to 1982. The components of JD 2640 powerline system: John Deere 4 Cycle 4-cylinder diesel engine and a 8x4 collar shift transmission, or 2-Speed powershift transmission with 16 forward and 8 reverse gears.

A 276 cubic inches engine output rating is 77 hp (57 kW) at 2500 rev/min. The maximum forward speed - 17.3 mph (27.8 kph), max. reverse speed - 6.9 mph (11.1 kph). The closed center hydraulic system includes a piston pump with flow rate of 13 gpm (49.2 lpm). The hydraulic system pressure is 155 bar (2250 psi).

The tractor has a Cat.2 three-point hitch with a position control and lower-link draft sensing. The tractor is equipped with 7.5x16 front tyres and 16.9x28 rear tyres. The wheelbase is 85.8 inches (2170 mm).

Engine Troubleshooting
Engine doesn't start or difficult to start
Dirty fuel filter element - Change filter element
The fuel shut-off valve is closed - Open fuel shut-off valve
Air in fuel lines - Bleed fuel lines
Fuel injectors are defective or dirty - Change fuel injectors
Fuel injection pump is broken - Rebuild or change fuel pump
Bad compression - Check cylinder block and replace worn parts
Engine shuts off unexpectedly while running
Engine is cold - Warm up to required temperature
There is air in the fuel system - Bleed the system
Improper fuel injection - Fuel injection settings required
Fuel filter is clogged - Replace the filter element
Fuel injectors are clogged or faulty - Clean or replace fuel injectors
Engine starts and stalls immediately
Incorrectly set fuel injection pump timing - Check and correct settings
Fuel filter clogging - Install new filter element
Fuel injector nozzles are dirty or defective - Replace fuel injector nozzles
Defective fuel injection pump - Replace or rebuild injection pump
Air cleaner element is clogged - Change or service air cleaner element
Engine stops while idling
Low idle speed adjustment is incorrect - Adjust low idle speed
Fuel injection pump is defective - Replace or repair injection pump
Fuel injector nozzles are dirty - Change injector nozzles
Valve out of adjustment - Adjust valve clearance
Engine overheated
Low coolant level - Refill to the correct level. Check for coolant leaks
Cooling system components are damaged or system is dirty - Flush cooling system or replace faulty parts
Engine oil level low - Need to add engine oil
Improper fan belt tension or damaged belt - Change or adjust belt tension correctly
Thermostat is defective - Thermostat needs to be replaced
Engine power is reduced
Clogged or damaged injectors - Service or change fuel injectors
Fuel injection pressure is wrong - Adjust to correct pressure
Air filter is dirty - Clean or replace the air filter element
Oil filter is dirty - Service or replace engine oil filter
Engine overloaded - Reduce load or shift to lower gear
Improper valve clearance - Adjust valve clearance
Improperly adjusted low idle speed - Correct the settings
Dirt in the fuel pipes or hoses - Clean fuel hoses and pipes
Engine lost compression: Leaking or broken valves - Install new valves
Abnormal engine knocking or noise
Fuel injection pump out of timing - Repair or replace fuel injection pump
Fuel injector nozzles are faulty - Change injector nozzles
Low engine oil level - Check and refill engine oil
Engine not warmed up - Warm up the engine
Crankshaft or main bearings are worn out - Replace crankshaft or bearings
Damaged or defective piston rings - Replace piston rings
Flywheel bolts are loose - Bolts need to be tightened
Excessive engine oil consumption
Oil leaks: Seals or gaskets are wearing excessively - New components need to be installed
Crankcase oil too light - Use oil of proper viscosity
Stuck or defective piston rings - Have piston rings replaced
Valve guides and stems are worn - Valves must be replaced
Pistons or cylinder liners are worn - Check pistons and liners, change as required

Electrical System Troubleshooting
Battery is not charging
Battery faulty cell - Battery change required
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Corroded or loose battery terminals and cables - Cables and terminals must be tightened or cleaned
Defective belt or improperly adjusted belt tension - Adjust belt tension properly or replace belt
Starter motor turns slow
Battery capacity is low - Low battery charging, charge as required
Battery runs out quickly - Service or replace the battery
Battery cable harness damage - Check battery cables for damage, change or repair
Corroded or loose cables and terminals - Cables and terminals must be tightened or cleaned
Starter does not work
Battery power is low - Battery is drained, recharge it
Discharged or defective battery - Recharge or change battery
Starter motor is defective - Starter should be changed
Wiring is improperly connected or disconnected - Need to reconnect the wiring properly

Transmission Troubleshooting
Gear shift is hard
Worn or incorrectly adjusted clutch - Adjust or install new clutch
Gear shift linkage is loose or broken - Replace or repair the shift linkage
Damaged or worn shift forks - Replace defective shift forks
Defective gearshift mechanism - Replace defective components
Low transmission oil pressure
Insufficient fluid supply - Check transmission fluid level and add it as required
Transmission fluid filter element is dirty (if fitted) - Replace or clean transmission fluid filter
Faulty relief valve - Change the valve
Transmission is excessively noisy
Bearings are worn or cracked - Bearings replacement required
Insufficient oil supply - Add transmission oil as required
Transmission fluid contamination - Fill up with fresh transmission fluid
Backlash is incorrect or gears are worn - Set backlash properly or change the gears
Shift forks are worn or damaged - Shift forks need to be changed
Transmission fluid leaking
Broken gaskets or seals - Change defective seal or gaskets
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
Hydraulic system pressure is unadjusted - Adjust the pressure as required
Main relief valve is defective or unadjusted - Adjust or replace the relief valve
Hydraulic oil contamination - Change the oil
Aeration in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Insufficient hydraulic fluid pressure
Hydraulic oil level is low - Check oil level and add hydraulic oil as required
Hydraulic oil filter is dirty - Clean or replace the hydraulic filter
Hydraulic pump malfunction - Test the pump flow rate and change pump if required
Hydraulic control valve is defective or set improper - Replace or set correctly
Hydraulic cylinder malfunction - Inspect cylinder components for wear or damage and change if required
Leakage in hydraulic pipes - Identify leaks in the system and repair it
Hitch cannot be raised or raising is too slowly
Hydraulic oil level is insufficient - Fill the hydraulic system with oil
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter is clogged - Install a new hydraulic filter element
Faulty hydraulic oil pump - Check the pump performance and replace it if required
Main relief valve incorrect adjustment or failure - Adjust or change relief valve
Hydraulic control valve is faulty or out of adjustment - Change or adjust properly
Broken hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Damaged or loose suction line - Tighten or change
Hitch drops too slowly or can't drop
Defective or incorrect setting hydraulic spool valve block - Adjust correctly or replace
Faulty hydraulic cylinder - Check cylinder components for damage or wear and change if necessary
Hitch rock shaft is damaged - Install a new shaft
Damaged mechanical components of the hitch - Replace worn or damaged hitch parts
Hitch jerks when lift or lower
Aeration in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Dirty hydraulic fluid - The fluid must be changed
Hydraulic pump failure - Check pump performance and change it if necessary
Defective or incorrect setting hydraulic spool valve block - Adjust properly or change
Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Steering wheel is difficult to turn
Steering column is worn or improperly fitted - Refit properly or change the steering column
Air enters in steering system - Need to bleed air
Not adjusted toe-in - Adjust toe-in wheels properly
Tire pressure is low - Tires need to be inflated
Steering pump malfunction - Check the steering pump and replace if necessary
Faulty or worn power steering valve - Inspect and change as required
Damaged steering box parts - Replace defective parts of power steering box
Insufficient steering oil - Need to add steering oil
Oil leaks in the steering system - Retighten the connections of the hydraulic steering lines and hoses
Excessive play in steering
Steering column shaft or coupling has maximum wear - Replace faulty part
Damaged or worn power steering valve - Replace or repair steering valve as required
Worn steering box components - Defective power steering box components must be replaced
Steering pump not working - Check the steering pump and replace if necessary
Faulty or worn steering tie-rod ends or linkage - Change failed component
Tractor is pulling to right or left
Incorrect tire pressure - Inflate the tires correctly
Improper toe-in adjustment - Adjust toe-in properly
Worn or faulty steering tie-rod ends or linkage - Change damaged component
Worn steering box parts - Replace defective components of power steering box
Power steering valve is damaged or worn - Inspect and replace as required
Worn or incorrectly adjusted or worn front hub bearings - Change or adjust bearings 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