________________________________________________________________________________________
John Deere 2720 Troubleshooting
The
John Deere 2720 is a 4-wheel drive compact utility tractor. This model was
manufactured between 2008 and 2012. The components of John Deere 2720 driveline
system: Yanmar 3TNV88 4-cycle three-cylinder direct injection liquid-cooled
diesel engine and two-range hydrostatic transmission with infinite forward and
reverse gears.
A 100.2 cubic inches (1.6L) engine has a cylinder bore of 3.47" (88 mm),
piston stroke of 3.54" (90 mm), and maximum power of 31.4 hp (23.4 kW).
Max forward speed - 4.7 mph (7.6 km/h) using low range or 13.5 mph (21.7
km/h) using high range, max reverse speed - 4.7 mph (7.6 km/h) using low
range or 13.2 mph (21.2 km/h) using high range. The open center
hydraulic system used a gear pump with a flow rate of 5 gal/min (19
l/min). The hydraulic system pressure is 167 bar (2420 psi).
The John Deere 2720 is equipped with a power steering system, wet disc
brakes, 23x8.50-12 (Turf) or 23x8.50-14 (Industrial) front tires, and
36x14.00-15 (Turf) or 14-17.5 (Industrial) rear tires. The wheelbase is
65.2" (1650 mm). The tractor is compatible with a
John Deere 200CX
front-end loader with lift capacity to full height of 902 lbs (409 kg)
and breakout force of 2239 lbs (1015 kg), and John Deere 46 backhoe with
2-ft flat digging depth of 78" (1980 mm).
| Engine Troubleshooting |
| Engine doesn't start or starts hard |
| Fuel filter plugging - Clean or change the filter |
| No fuel supply from the tank - Open the fuel supply valve |
| Air in fuel system - Air-bleed fuel system |
| Fuel injectors are damaged or dirty - Change fuel injectors |
| Fuel injection pump malfunction - Replace or rebuild injection pump |
| Engine has low compression - Inspect cylinder block and change defective components |
| Engine shuts off while driving |
| Engine is not fully warmed up - Warm up the engine |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Irregular fuel injection - Adjust fuel injection timing |
| Fuel filter clogging - Change filter element |
| Fuel injectors are defective or dirty - Test fuel injectors and change if necessary |
| Engine starts but immediately shuts off |
| Fuel injection pump timing is incorrect - Check and correct settings |
| Dirty fuel filter element - Change the filter element |
| Clogged or damaged injector nozzles - Install new set of properly balanced nozzles |
| Damaged fuel injection pump - Repair or install a new fuel pump |
| Air cleaner is clogged - Replace cleaner or install new cleaner element |
| Low idle speed set incorrectly - Adjust as required |
| Fuel injection pump is not operating properly - Change or repair the pump |
| Fuel injector nozzles fault - Service or replace injector nozzles |
| The valve clearance is not adjusted - Adjust valve clearance |
| Lack of engine coolant - Top up coolant. Check system for leaks |
| Cooling system parts are defective or system is dirty - Change faulty components or service cooling system |
| Insufficient engine oil - Fill up the engine oil |
| Fan belt tension is improper or belt is damaged - Adjust belt tension properly or change it |
| Thermostat fault - Check and replace if required |
| Clogged or damaged injectors - Test fuel injectors and change if necessary |
| Incorrect fuel injection pressure - Adjust to correct pressure |
| Air filter is clogged - Service or change air filter |
| Oil filter element clogging - Change or clean engine oil filter element |
| Engine is running overloaded - Reduce the load or use a lower gear |
| Improper valve clearance - Adjust valve clearance according to specifications |
| Wrong adjustment of low idle speed - Adjust as required |
| Clogged fuel pipes or hoses - Service fuel hoses and pipes |
| Engine lost compression: Leaking or broken valves - Valves need to be replaced |
| Abnormal engine knocking or noise |
| Fuel injection pump timing is incorrect - Check the fuel injection pump timing setting |
| Dirty or defective injector nozzles - Replace fuel injector nozzles |
| Insufficient engine oil - Check and refill engine oil |
| Engine is not preheated - Warm up to required temperature |
| Crankshaft or main bearings failure - Worn parts replacement required |
| Defective or broken piston rings - Replace piston rings |
| Flywheel bolts are loose - Bolts need to be tightened |
| Engine using too much oil |
| Oil leaks: Worn gaskets or seals - Replace worn parts to avoid leaks |
| Incorrect oil viscosity - Use oil of correct viscosity |
| Piston rings are defective or worn - Have piston rings replaced |
| Damaged valve guides or valve stems - Replace defective valves |
| Cylinder liners or pistons are scuffed - Check pistons and liners, replace as required |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery failing - Battery change required |
| Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
| Battery cables and terminals are corroded or loose - Service or tighten battery cables and terminals |
| Belt damage or incorrect belt tension adjustment - Replace belt or properly adjust belt tension |
| Low battery power - Charge the battery |
| Battery discharges quickly - Service battery or change it |
| Bad battery cable harness - Inspect cables for malfunctions, repair or change |
| Loose or corroded battery cables and terminals - Tighten or service terminals and cables |
| Starter motor is not working |
| Low battery output - Battery needs to be recharged |
| Drained or defective battery - Charge or change the battery |
| Damaged starter motor - Repair or replace starter |
| Disconnected or incorrectly connected cables - Inspect battery cables and connect correctly |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noises |
| Contaminated oil or low oil level - Top up to proper level or change oil |
| Speed control rod linkage is damaged or unadjusted - Change or adjust rod linkage |
| Relief valve is defective - Install a new valve |
| Transmission overloaded - Load needs to be reduced |
| Transmission components are worn or damaged - Change or repair damaged parts |
| Transmission fluid over heats |
| Insufficient oil supply - Correct the transmission oil level |
| Transmission fluid filter element is dirty - Clean or replace the transmission fluid filter |
| Cooling components are clogged or damaged - Check all cooling components and repair or change if required |
| Excessive transmission load - Reduce transmission load |
| Insufficient fluid supply - Fill the transmission housing with fluid |
| Insufficient charge pressure - Test charge pressure |
| Relief valve is worn or damaged - Replace valve as required |
| Gaskets or seals are damaged - Change defective seal or gaskets |
| High pressure inside the transmission housing - Replace or repair defective components |
| Oil return tube is clogged - Inspect tube and service if required |
| Hydraulics Troubleshooting |
| Excessive hydraulic system heat |
| Hydraulic system pressure is unadjusted - Adjust the pressure as required |
| Main relief valve incorrect adjustment or failure - Set up or change the relief valve |
| Contaminated hydraulic fluid - Change hydraulic fluid |
| Air enters in hydraulic system - Check the pump seals, suction line, and fittings |
| Hydraulic oil pressure is low |
| Hydraulic fluid level is insufficient - Add fluid to the hydraulic system |
| Hydraulic oil filter is dirty - Change the hydraulic filter element or service if required |
| Hydraulic pump malfunction - Check pump flow and change pump if necessary |
| Faulty or incorrect setting hydraulic spool valve - Set correctly or replace |
| Hydraulic cylinder is not working - Check cylinder parts for wear or damage and replace if necessary |
| Hydraulic piping leaks - Identify leaks in the system and repair it |
| 3-point hitch lifts slowly or won't lift |
| Not enough hydraulic fluid in the system - Need to add fluid |
| Cold oil in hydraulic system - Wait for oil to warm up |
| Hydraulic oil filter element clogging - Change the hydraulic filter element or service if required |
| Defective hydraulic pump - Test pump flow rate and replace pump if required |
| Faulty or incorrectly adjusted main relief valve - Adjust or replace the relief valve |
| Hydraulic spool valve block is faulty or out of adjustment - Adjust correctly or change |
| Faulty hydraulic cylinder - 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 drops slowly or won't drop |
| Hydraulic spool valve block is not set properly or defective - Set properly or replace |
| Hydraulic cylinder is not working - Inspect cylinder parts for wear or damage and replace if required |
| Hitch rock shaft is worn Replace the shaft |
| Internal mechanical malfunction with hitch - Replace faulty or worn hitch components |
| Hitch is lowered or raised jerkily |
| Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals |
| Dirty hydraulic oil - The oil must be changed |
| Hydraulic pump is faulty - Check the pump performance and replace it if required |
| Damaged or incorrect adjusted hydraulic control valve - Replace or adjust correctly |
| Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary |
| Steering System Troubleshooting |
| Steering wheel is difficult to turn |
| Defective or improperly assembled steering column - Reassemble properly or change steering column |
| Air in steering system - Bleed the system of air |
| Incorrect toe-in - Check and adjust toe-in |
| Tires are not correctly inflated - Inflate tires as necessary |
| Steering pump not working - Check the hydraulic steering pump and change if necessary |
| Worn or defective power steering control valve - Inspect and change as required |
| Relief valve is seized or defective - Replace or install new relief valve |
| Not enough steering oil - Check oil level and add steering oil as required |
| Oil leakage in the steering system - Retighten steering pipe and hose connections |
| Excessive steering wheel play |
| Worn steering column coupling or shaft - Change defective component |
| Damaged or worn power steering control valve - Check and replace as required |
| Damaged hydraulic steering pump - Check the hydraulic steering pump and change if necessary |
| Steering linkage or tie-rod ends are worn - Replace damaged part |
| Tractor pulls to left or right |
| Incorrect tire pressure - Inflate the tires correctly |
| Incorrect toe-in adjustment - Check and adjust toe-in |
| Worn or faulty steering tie-rod ends or linkage - Replace failed part |
| Power steering control valve is worn or defective - Replace or repair steering control valve as required |
| Steering cylinder is defective - Repair or replace steering cylinder |
| Front hub bearings are damaged or incorrectly adjusted - Adjust properly or replace bearings |
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
| Farm Tractors Technical Specifications |
