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John Deere 1025R Troubleshooting

The John Deere 1025R sub-compact utility tractor was manufactured from 2013 to 2021. The John Deere 1025R driveline includes a 77.2 cubic inches (1.26 L) Yanmar 3TNV80 4-cycle vertical in-line 3-cylinder indirect injection naturally aspirated water-cooled diesel engine and 2-range hydrostatic transmission with infinite forward and reverse gears.

The engine has a cylinder bore of 3.15" (80 mm), piston stroke of 3.31" (84 mm), and maximum power of 24.2 hp (17.8 kW). Max. travel speed (forward and reverse): 9.1 mph (14.5 km/h). The open center hydraulic system used a gear pump with rated capacity of 3.5 gal/min (13.3 l/min). The hydraulic system pressure is 138 bar (2000 psi). The tractor is equipped with a power steering system, wet disc brakes, 18x8.50-10 front tires, and 26x12.00-12 rear tires. The wheelbase is 57" (1450 mm).

Compatible attachments for the John Deere 1025R: 54" or 60" mid-mount 3-blade AutoConnect mower decks, 54" front-mount blade, John Deere D120 front-end loader with lift capacity to full height of 825 lbs (374 kg), John Deere H120 front-end loader with lift capacity to full height of 836 lbs (380 kg), and John Deere 260 backhoe with maximum digging depth of 74" (1870 mm).

Engine Troubleshooting
Engine hard starting or not starting
Fuel filter clogging - Replace the filter element
No fuel injection - Open fuel cock to inject fuel
Air in fuel lines - Bleed fuel lines
Dirty or damaged injectors - Inspect fuel injectors and replace if necessary
Fuel injection pump is damaged - Replace injection pump or repair it
Low cylinder compression - Check and replace worn parts
Diesel stalls while running
Coolant temperature is low - Warm up to required temperature
There is air in the fuel system - Bleed the system
Improper fuel injection - Fuel injection settings required
Plugged fuel filter - Service or replace the filter
Faulty or dirty injectors - Change fuel injectors
Engine starts and stops
Fuel injection pump out of timing - Repair or replace fuel injection pump
Clogged fuel filter element - Change the filter element
Dirty or defective injector nozzles - Test injector nozzles and replace as required
Fuel injection pump is broken - Rebuild or change fuel pump
Dirty air cleaner - Replace or service air cleaner element
Engine stops when idle
Incorrect low idle setting - Test and adjust
Fuel injection pump is faulty - Rebuild or replace pump
Fuel injector nozzles are faulty - Change or clean injector nozzles
The valve clearance is incorrect - Check and adjust
Engine overheating
Coolant level is low - Coolant needs to be refilled. Inspect the system for leaks
Cooling system is dirty or cooling components are damaged - Flush cooling system or change faulty components
Lack of engine oil - Need to add engine oil
Fan belt tension is improper or belt is damaged - Adjust as required or replace belt
Thermostat failure - Check and change if necessary
Engine power is too low
Fuel injectors are damaged or dirty - Check fuel injectors and replace if required
Improper fuel injection pressure - Adjust pressure to proper level
Dirty air filter - Replace filter or install new filter element
Dirty oil filter element - Replace or service engine oil filter
Engine overload - Reduce load or shift to lower gear
Improper valve clearance - Have it adjusted
Wrong adjustment of low idle speed - Correct low idle settings
Clogged fuel pipes or hoses - Service fuel pipes and hoses
Engine compression is insufficient: Inlet or outlet valves are defective - Change the valves
Engine knocking or noise
Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected
Faulty fuel injector nozzles - Install a new set of well-balanced nozzles
Engine oil level is low - Checking oil level and add if necessary
Engine is cold - Warm up engine as required
Main bearings or crankshaft are worn out - Install new parts
Defective or broken piston rings - Replace the piston rings as required
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
Diesel engine using too much oil
Oil leakage: Gaskets or seals are excessively worn - Worn parts need to be replaced
Improper oil viscosity - Fill up with the correct oil viscosity
Piston rings are seized or worn - Have piston rings replaced
Damaged valve stems or valve guides - Replace defective valves
Cylinder liners or pistons are damaged - Check liners and pistons, replace as required

Electrical System Troubleshooting
Battery won’t charge
Battery failing - Replace the battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Loose or corroded cables and terminals - Terminals and cables need to be tightened or cleaned
Belt wear or improper belt tension adjustment - Adjust belt tension properly or change belt
Starter turns slowly
Battery capacity is low - Battery needs to be recharged
Battery runs out quickly - Service battery or change it
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Battery cables and terminals are corroded or loose - Cables and terminals must be tightened or cleaned
Starter will not crank
Low battery capacity - Battery is drained, recharge it
Discharged or worn battery - Charge or change the battery
Starter motor failing - Repair or change starter
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission makes noise
Fluid level is too low or fluid is dirty - Change fluid or top up to proper level
Speed control rod linkage is damaged or unadjusted - Adjust or replace control rod linkage
Relief valve sticking - Replace relief valve
Transmission overload - Reduce transmission load
Transmission parts are worm or defective - After disassembly and checking, replace worn components
Transmission oil overheats
Fluid level is low - Fill system with correct transmission fluid level
Transmission oil filter element is clogged - Change or clean the transmission oil filter
Cooling components are defective or plugged - Inspect all cooling components and replace or repair if necessary
Excessive loading - Load needs to be reduced
Loss of power
Fluid level is low - Fill up the transmission fluid
Charge pressure is too low - Test charge pressure
Defective or worn relief valve - Replace relief valve as required
Transmission fluid leaking
Worn gaskets or seals - Install new components
Internal transmission case pressure is too high - Repair or replace worn parts
Clogged transmission fluid drain line - Service or replace drain line

Hydraulics Troubleshooting
Hydraulic system overheating
Improper hydraulic system pressure setting - Set the pressure properly
Unadjusted or defective main relief valve - Adjust or replace the relief valve
Hydraulic oil is dirty - Hydraulic oil change required
Air enters in hydraulic system - Inspect the suction line, pump seals, and fittings
Hydraulic oil pressure is low
Not enough hydraulic fluid in the system - Need to add fluid
Hydraulic fluid filter element is dirty - Clean the hydraulic filter element or replace if necessary
Hydraulic pump is defective - Test the pump flow rate and change pump if required
Hydraulic control valve block is defective or set improper - Adjust properly or change
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic pipes are leaking - Find leaks in the system and fix it
Hitch fails to lift or lifts slowly
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Hydraulic oil is too cold - Allow oil to warm
Hydraulic oil filter is dirty - Replace hydraulic filter element or service if necessary
Hydraulic pump is faulty - Test the pump flow rate and install new pump if required
Faulty or incorrectly adjusted main relief valve - Adjust or change relief valve
Hydraulic spool valve block is not set properly or defective - Set properly or replace
Hydraulic cylinder is defective - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Damaged or loose hydraulic suction line - Tighten or change it
Three-point hitch dropping is too slow or cannot be dropped
Hydraulic control valve block is not set properly or defective - Adjust correctly or replace
Hydraulic cylinder failure - Inspect cylinder components for wear or damage and change if required
Worn hitch cross shaft - Change the shaft
Damaged mechanical components of the hitch - Change defective or worn hitch components
Hitch jerks when drop or lift
Hydraulic system sucks air - Check the pump seals, suction pipe, and fittings
Hydraulic oil is dirty - Hydraulic oil change required
Defective hydraulic pump - Check the pump performance and replace it if required
Hydraulic spool valve is defective or set improper - Replace or adjust correctly
Hydraulic cylinder failure - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Steering is hard
Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced
Air in steering system - Bleed the steering system
Improper toe-in adjustment - Check and adjust toe-in
Deflated front tyres - Inflate tyres as needed
Steering pump stopped working - Check the steering pump and replace if necessary
Power steering valve has wear or malfunction - Inspect and replace as required
Relief valve failure or seizing - Install a new relief valve or clean it
Insufficient steering fluid - Fill up the steering fluid
Steering system oil leak - Retighten joints of the hydraulic steering pipes and hoses
Excessive steering wheel free play
Steering column shaft or coupling is worn out - Change defective component
Worn or defective power steering valve - Replace or repair steering valve as required
Hydraulic steering pump is defective - Check the hydraulic steering pump and change if necessary
Steering tie-rod ends or linkage are defective - Replace damaged component
Tractor pulls to left or right
Tires are deflated - Need to inflate tires
Not adjusted toe-in - Adjust toe-in properly
Steering tie-rod ends or linkage are worn - Replace damaged part
Power steering valve has wear or malfunction - Change or repair steering valve if required
Steering cylinder is defective - Change or repair steering cylinder
Worn or incorrectly adjusted or worn front hub bearings - Adjust correctly or change 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