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John Deere 1026R Troubleshooting

The John Deere 1026R is a 4-wheel drive sub-compact utility tractor. This model was manufactured between 2011 and 2012. The JD 1026R driveline consists of Yanmar 3TNV76 vertical 3-cylinder indirect injection naturally aspirated diesel engine and 2-range hydrostatic transmission with infinite forward and reverse gears.

A 68.1 cu.in (1.1 L) engine has a cylinder bore of 2.99" (76 mm), piston stroke of 3.23" (82 mm), and rated power of 25.2 hp (18.5 kW). Max. travel speed: 4.1 mph (6.6 km/h) using a low range, and 9.1 mph (14.6 km/h) using a high range.

The open center hydraulic system includes a gear pump with a flow rate of 3.5 gal/min (13.2 l/min). The main relief pressure is 2000 psi (138 bar). The John Deere 1026R was equipped with 18x8.50-10 front tires and 26x12.00-12 rear tires. The wheelbase is 57.1" (1450 mm).

The tractor is compatible with a 54" mid-mount John Deere 54D AutoConnect mower deck, 60" mid-mount John Deere 60D AutoConnect mower deck, John Deere D120 loader with lift capacity to max height of 825 lbs (374 kg), and John Deere H120 loader with ift capacity to max height of 836 lbs (379 kg).

Engine Troubleshooting
Engine doesn't start or hard to start
Fuel filter is clogged - Clean the filter element
Closed fuel supply valve - Open supply valve to inject fuel
Air trapped in fuel system - Bleed air
Fuel injectors are clogged or faulty - Check fuel injectors and replace if required
Fuel injection pump malfunction - Change or repair the pump
Poor compression - Inspect cylinder block and change damaged parts
Engine stops running while driving
Engine is not preheated - Normalize the temperature by warming up the engine
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Uneven fuel injections - Repair or adjustment
Fuel filter plugging - Clean or change the filter
Dirty or faulty injectors - Clean or replace fuel injectors
Engine stops after starting
Timing of fuel injection pump is wrong - Correct injection timing
Dirty fuel filter element - Replace filter element
Fuel injector nozzles fault - Install a new set of well-balanced nozzles
Fuel injection pump is not operating properly - Change or repair the pump
Air cleaner element is dirty - Install new cleaner element or replace it
Engine stops at idle
Incorrectly set low idle speed - Adjust low idle speed
Damaged fuel injection pump - Repair or replace injection pump
Faulty fuel injector nozzles - Install a new set of well-balanced nozzles
Improper valve clearance - Adjust valve clearance according to specifications
Engine overheated
Lack of coolant in cooling system - Top up coolant. Check for coolant leaks
Cooling system components are damaged or system is dirty - Replace faulty parts or service cooling system
Engine oil level is insufficient - Add oil to the engine crankcase
Fan belt is broken or belt tension is unadjusted - Adjust belt tension correctly or change it
Thermostat malfunction - Replace the thermostat
Reduced engine power
Dirty or damaged injectors - Change fuel injectors
Uneven fuel injection pressure - Adjust to proper pressure
Dirty air filter element - Service or change air filter
Oil filter element clogged - Service or replace engine oil filter
Engine is overloaded - Load reducing required
Excessive valve clearance - Check and adjust
Incorrect low idle speed adjustment - Adjust low idling as recommended
Restricted fuel hoses or pipes - Clean fuel system pipes and hoses
Lack of compression: Valves are faulty or leaking - Have valves replaced
Engine noises or knocks
Incorrect setting of fuel injection pump timing - Check the fuel injection pump timing setting
Fuel injector nozzles are defective or dirty - Install new set of properly balanced nozzles
Engine oil insufficient - Fill up the oil to required level
Engine not warmed up - Normalize the temperature by warming up the engine
Worn crankshaft or main bearings - Change or repair worn components
Piston rings failure - Piston rings need to be replaced
Flywheel mounting screws are loose - Tighten the screws
Excessive engine oil consumption
Oil leaking: Defective seals or gaskets - Replace worn parts to avoid leaks
Crankcase oil too light - Fill up with the proper oil viscosity
Stuck or defective piston rings - Change piston rings
Valve guides or stems are damaged - Valves replacement required
Cylinder liners or pistons are scuffed - Check pistons and liners, install new parts as required

Electrical System Troubleshooting
Battery will not charge
Faulty cell in battery - Battery replacement required
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Corroded or loose terminals and cables - Clean or tighten terminals and cables
Belt is defective or belt tension is improperly adjusted Adjust belt tension as required or replace belt
Starter motor turns slow
Battery power is low - Low battery charging, charge as required
Battery drains quickly - Service charging system or replace battery
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Loose or corroded battery terminals and cables - Tighten or clean cables and terminals
Starter motor is not working
Battery power is low - Battery is drained, charge it
Drained or faulty battery - Need to charge or replace the battery
Faulty starter motor - Starter should be changed
Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission noises
Low fluid level or contaminated fluid - Add the fluid to proper level or pour fresh fluid
Damaged or out of adjustment speed control rod linkage - Adjust or change rod linkage
Relief valve is defective - Change relief valve
Transmission is under excessive load - Load needs to be reduced
Defective or worn components of transmission - After disassembling and checking, change defective parts
Transmission oil over heats
Oil level is insufficient - Fill up the transmission oil
Transmission fluid filter clogging - Change or service the transmission fluid filter
Defective or plugged cooling components - Inspect all cooling components and replace or clean if necessary
Transmission is under excessive load - The load should be reduced
Low power
Low transmission fluid level - Check and refill the transmission fluid
Low charge pressure - Check charge pressure
Relief valve is damaged or worn - Replace the valve
Transmission fluid leaks
Gaskets or seals are broken - Gaskets or seal need to be replaced
Transmission housing internal pressure is excessive - Change or repair damaged parts
Oil return tube is plugged - Check tube and clean if required

Hydraulics Troubleshooting
Hydraulic system is too hot
System pressure has not been adjusted correctly - Pressure needs to be adjust correctly
Misadjusted or defective main relief valve - Set up or change the relief valve
Contaminated hydraulic fluid - Change hydraulic fluid
Air leaks in hydraulic system - Inspect the pump seals, suction line, and fittings
Insufficient hydraulic fluid pressure
Hydraulic fluid level is insufficient - Add fluid to the hydraulic system
Hydraulic fluid filter element clogging - Hydraulic filter maintenance required
Hydraulic pump malfunction - Test pump flow rate and replace pump if required
Hydraulic control valve block is faulty or out of adjustment - Change or adjust correctly
Defective hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Leakage in hydraulic pipes - Identify leaks in the system and repair it
Hitch won't lift or lifts slowly
Lack of hydraulic fluid - Add fluid to the hydraulic system
Cold oil in hydraulic system - Wait for oil to warm up
Hydraulic fluid filter is dirty - Replace filter element or clean if required
Hydraulic pump is defective - Check pump flow and change pump if necessary
Unadjusted or defective main relief valve - Set up or change the relief valve
Defective or not adjusted hydraulic spool valve - Adjust correctly or change
Hydraulic cylinder malfunction - Check the hydraulic cylinder components for damage or wear and change if necessary
Broken or disconnected suction line - Connect or replace
Hitch won't lower or lowers slowly
Hydraulic spool valve block is faulty or out of adjustment - Replace or adjust correctly
Hydraulic cylinder is broken - Check cylinder parts for wear or damage and replace if necessary
Worn lift arm shaft - Replace the shaft
The hitch has internal mechanical malfunctions - Replace damaged or worn hitch parts
Hitch lowering or lifting is not smoothly
Aeration in hydraulic system - Inspect the pump seals, suction line, and fittings
Dirty hydraulic oil - The oil must be changed
Hydraulic pump is defective - Test the pump flow rate and install new pump if required
Faulty or incorrect setting hydraulic control valve - Adjust properly or change
Hydraulic cylinder is broken - Inspect the hydraulic cylinder parts for damage or wear and replace if required

Steering System Troubleshooting
Heavy steering
Steering column is worn or improperly fitted - Refit properly or change the steering column
Air enters in steering system - Bleed air
Incorrect toe-in adjustment - Check toe-in and correct
Tires are incorrectly inflated - Inflate as required
Worn steering pump - Check the hydraulic steering pump and change if necessary
Power steering valve is damaged or worn - Repair or change the steering valve
Relief valve is faulty or stuck - Replace or service relief valve
Steering fluid level is insufficient - Add oil to steering system
Oil leakage in the steering system - Tighten the steering hose and pipe joints
Steering wheel free play is excessive
Steering column coupling or shaft is worn - Replace faulty part
Faulty or worn power steering valve - Change or repair steering valve if required
Steering pump malfunction - Repair or change steering pump
Steering linkage or tie-rod ends are worn - Replace failed part
Front wheels wander to left or right
Tires are improperly inflated - Inflate as necessary
Incorrect toe-in adjustment - Check toe-in and correct
Steering linkage or tie-rod ends are defective - Replace failed part
Power steering valve is defective or worn - Repair or change the steering unit
Worn steering cylinder - Repair or replace hydraulic steering cylinder
Defective or improperly adjusted front hub bearings - Adjust properly 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