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John Deere 2520 Troubleshooting

The John Deere 2520 is a 4WD (4x4) compact utility tractor from 2000 Twenty series. This model was manufactured between 2006 and 2012. The John Deere 2520 driveline system components: a 81.2 cu.in (1.3 L) Yanmar 3TNV82A 4-cycle vertical in-line 3-cylinder direct injection naturally aspirated liquid-cooled diesel engine with a maximum power of 26.4 hp (19.7 kW), and two-range hydrostatic transmission with infinite forward and reverse gears.

Max forward speed - 13.4 mph (21.5 km/h), maximum reverse speed - 13 mph (20.9 km/h). The open center hydraulic system includes a gear pump with rated fluid flow of 5 gal/min (19 l/min). The hydraulic pressure is 167 bar (2420 psi). The tractor is equipped with a power steering system, wet disc brakes, 24x8.5-14 (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 John Deere 2520 is compatible with the following attachments: 62" or 72" mid-mount 3-blade mower decks with cutting height of 1.0-6.0" (25-152 mm) and hydraulic lift system, John Deere 200CX front-end loader with lift capacity to full height of 902 lbs (409 kg), and John Deere 46 backhoe with 2-ft flat digging depth of 78" (1980 mm).

Engine Troubleshooting
Engine hard starting or not starting
Dirty fuel filter element - Change the filter element
Fuel is not supplied from the tank to the system - Check the fuel shut-off valve
There is air in the fuel system - Bleed the system
Fuel injectors are defective or dirty - Clean or replace fuel injectors
Fuel injection pump failure - Repair or replace injection pump
Poor cylinder compression - Check and change damaged parts
Engine stops running while driving
Engine is cold - Warm up the engine
Air in fuel system - Air-bleed fuel system
Improper fuel injection - Fuel injection settings required
Dirty fuel filter element - Clean or replace the filter
Clogged fuel injectors - Service or change fuel injectors
Engine starts but immediately stops
Unadjusted fuel injection pump timing - Repair or replace fuel injection pump
Fuel filter is dirty - Replace filter element
Fuel injector nozzles are damaged - Change injector nozzles
Fuel injection pump is broken - Install a new pump or rebuild
Dirty air cleaner - Service or change air cleaner
Engine stops at low idle speed
Low idle speed adjustment is incorrect - Adjustment required
Fuel injection pump is not working correctly - Replace or repair injection pump
Fuel injector nozzles are dirty - Replace fuel injector nozzles
Valve clearance is not correct - Correct valve clearance
Engine overheating
Low coolant level - Fill the cooling system. If there are leaks in the system, replace worn components
Cooling system is dirty or cooling components are damaged - Service the cooling system or change faulty parts
Engine oil level is insufficient - Checking oil level and add if necessary
Worn fan belt or unadjusted belt tension - Replace or adjust belt tension properly
Defective or wrong type of thermostat - Replace the thermostat
Engine power is insufficient
Dirty or damaged injectors - Change fuel injectors
Insufficient fuel injection pressure - Adjust pressure to proper level
Air filter is dirty - Change or service air filter element
Engine oil filter is plugged - Clean or change engine oil filter
Engine is overloaded - Load reducing is recommended
The valve clearance is incorrect - Correct valve clearance needs to be set
Incorrect low idle setting - Adjust the low idle speed
Dirt in the hoses or pipes - Fuel hoses and pipes must be clean
Engine compression too low: Valves are defective or worn - Replace the valves as required
Engine knocking or noise
Incorrect setting of fuel injection pump timing - Fuel pump timing settings need to be corrected
Fuel injector nozzles are clogged or faulty - Install a new set of well-balanced nozzles
Engine oil level is low - Fill the crankcase with engine oil
Low coolant temperature - Warm up engine as required
Crankshaft or main bearings are worn out - Change defective components as required
Piston rings are defective or broken - Piston rings need to be replaced
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
Engine oil consumption is too high
Oil leakage: Damaged gaskets or seals - Worn parts need to be replaced
Oil viscosity is wrong - Use oil of proper viscosity
Piston rings are seized or worn - Change piston rings
Valve stems and guides are worn - Need to replace the valves
Damaged cylinder liners or pistons - Inspect pistons and liners, replace as required

Electrical System Troubleshooting
Battery is not charging
Battery dead cell - Replace the battery
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Loose or corroded battery terminals and cables - Terminals and cables need to be tightened or cleaned
Defective belt or improperly adjusted belt tension - Change belt or adjust belt tension properly
Starter turning slow
Battery power is low - Battery is drained, recharge it
Battery is draining quickly - Service or change the battery
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Battery terminals and cables are corroded or loose - Service or tighten battery cables and terminals
Starter is not cranking
Low battery capacity - Recharge the battery
Discharged or worn battery - Battery needs to be recharged or replaced
Starter motor is defective - Starter should be changed
Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly

Hydrostatic Transmission Troubleshooting
HST transmission noise
Transmission fluid level is insufficient or fluid is contaminated - Change fluid or top up to proper level
Worn or misadjusted speed control rod linkage - Replace rod linkage or adjust correctly
Relief valve failure - Change relief valve
Transmission overload - Reduce the load is required
Worn or damaged transmission components - Replace or repair worn components
Transmission fluid overheats
Insufficient fluid supply - Fill up the transmission fluid
Transmission oil filter is plugged - Replace or service transmission oil filter
Defective or plugged cooling components - Inspect all cooling components and replace or repair if necessary
Transmission overloaded - Reduce transmission load
Low power
Low transmission oil level - Checking transmission oil level and add if necessary
Insufficient charge pressure - Check charge pressure
Relief valve is defective or worn - Install a new relief valve
Transmission fluid leakage
Seals or gaskets are damaged - Install new components
Internal transmission case pressure is too high - Inspect transmission components and replace if necessary
Clogged oil return tube - Service or replace return tube

Hydraulics Troubleshooting
Hydraulic system overheats
The system pressure has not been corrected - Make the correct settings
Faulty or incorrectly adjusted main relief valve - Adjust the valve or replace if necessary
Hydraulic fluid contamination - Change hydraulic fluid
Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Insufficient hydraulic oil pressure
Lack of hydraulic oil - Add oil to the hydraulic system
Hydraulic oil filter element clogging - Change hydraulic filter element or clean if necessary
Hydraulic pump is faulty - Check pump flow and install new pump if necessary
Defective or incorrect setting hydraulic control valve block - Replace or set properly
Hydraulic cylinder is defective - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Leakage in hydraulic lines - Find leaks in the system and fix it
3-point hitch does not raise or raises very slowly
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required
Cold fluid in hydraulic system - Wait for fluid to warm up
Hydraulic oil filter is dirty - Replace filter element or clean if required
Damaged hydraulic oil pump - Test the pump performance and change pump if required
Defective or misadjusted main relief valve - Set up or change the relief valve
Hydraulic control valve block is defective or set improper - Adjust properly or replace
Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Damaged or disconnected hydraulic suction pipe - Connect or replace the pipe
Hitch won't lower or lowers slowly
Hydraulic spool valve is faulty or out of adjustment - Change or set correctly
Defective hydraulic cylinder - Inspect cylinder components for damage or wear and change if required
Worn hitch cross shaft - Change the shaft
Mechanical parts of the hitch are damaged - Replace damaged or worn hitch parts
Hitch jerks when lift or lower
Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Hydraulic pump malfunction - Check pump capacity and change if necessary
Defective or incorrect setting hydraulic spool valve block - Replace or set properly
Hydraulic cylinder is faulty - Inspect the hydraulic cylinder parts for damage or wear and replace if required

Steering System Troubleshooting
Excessive effort to steer
Damaged or improperly installed steering column - Reinstall or replace the steering column
Air trapped in the steering system - Air-bleed steering system
Improper toe-in - Check toe-in and correct
Tire pressure is low - Tires need to be inflated
Damaged hydraulic steering pump - Repair or replace steering pump
Damaged or worn power steering control valve - Check and replace as required
Relief valve is seized or faulty - Inspect relief valve and replace if necessary
Insufficient steering fluid - Fill up the steering fluid
Steering system oil leakage - Tighten joints of hydraulic pipes and hoses in steering system
Excessive free play of steering wheel
Steering column coupling or shaft is extremely worn out - Replace faulty part
Defective or worn power steering control valve - Inspect and replace as required
Steering pump malfunction - Check the steering pump and replace if necessary
Steering tie-rod ends or linkage are worn - Change failed part
Front wheels wander to left or right
Tires are deflated - Need to inflate tires
Toe-in adjustment is incorrect - Adjust toe-in properly
Steering linkage or tie-rod ends are worn - Change damaged component
Power steering control valve has wear or malfunction - Inspect and replace as required
Steering cylinder malfunction - Repair or change steering cylinder
Incorrectly adjusted or worn front hub bearings - 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