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Home / Farm Tractors / John Deere Tractors / JD 2720

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
Engine stalling at idle
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
Engine overheated
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
Low engine power
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
Starter cranks slow
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
Lack of power
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
Transmission oil leaks
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

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