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John Deere 1520 Troubleshooting

The John Deere 1520 is a two-wheel drive utility tractor. This model was manufactured from 1968 to 1972. The John Deere 1520 tractor is powered by 164.9 cubic inches (2.7 L) 3-cylinder water-cooled diesel or gasoline engines with a rated power of 51 hp (37.8 kW).

The JD 1520 is fitted with 3 types of transmission. Type 1: Collar shift unsynchronized transmission with 8 forward and 4 reverse gears. Type 2: 16x8 two-speed powershift transmission with high and low range. Type 3: 8x4 power shuttle transmission.

Max. forward speed - 17.1 mph (27.4 kph), max. reverse speed - 5 mph (8.1 kph). The closed center hydraulic system includes a gear pump with a flow of 10.5 gpm (39.7 lpm). The main relief pressure is 155 bar (2250 psi). The John Deere 1520 was equipped with a power assist steering system, differential hydraulic wet disc brakes, 9.00x10 front tires, and 14.9x28 rear tires. The wheelbase is 74.2 in (1880 mm).

Diesel Engine Troubleshooting
Engine doesn't start or difficult to start
Fuel filter plugging - Clean the filter or install new filter element
No fuel supply from the tank - Open the fuel supply valve
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Fuel injectors are defective or dirty - Check fuel injectors and replace if required
Fuel injection pump is faulty - Repair or change injection pump
Poor compression - Check cylinder block and replace worn parts
Diesel stalls while running
Engine is not fully warmed up - Warm up the engine
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Fuel injection failed - Use correct settings
Plugged fuel filter - Install new filter element
Dirty or faulty injectors - Test fuel injectors and change if necessary
Diesel starts but suddenly stops
Fuel injection pump out of timing - Fuel injection pump timing adjustment needs to be corrected
Clogged fuel filter element - Change filter element
Damaged or clogged injector nozzles - Inspect injector nozzles and change if required
Fuel injection pump damage - Install a new pump or rebuild
Air cleaner clogging - Change or replace air cleaner element
Engine stalls while idle
Low idle speed setting is incorrect - Correct low idle adjustment
Fuel injection pump is not working correctly - Repair or change injection pump
Fuel injector nozzles are defective or dirty - Inspect injector nozzles and change if required
Incorrect valve clearance - Adjust to proper valve clearance
Engine overheating
Not enough coolant - Add the coolant. Repair any leaks if necessary
Cooling system parts are failed or system is dirty - Replace faulty parts or flush the cooling system
Engine oil level is insufficient - Check oil level and add oil as required
Fan belt tension is not adjusted or belt is broken - Adjust correctly or change the belt
Thermostat malfunction - Check and change if necessary
Diesel engine loses power
Dirty or damaged injectors - Clean or replace fuel injectors
Fuel injection pressure is wrong - Adjust pressure to proper level
Air filter is clogged - Install new filter element or replace it
Engine oil filter is plugged - Service or change engine oil filter element
Engine overload - Reduce engine load
Improper valve clearance - Adjust valve clearance
Low idle speed setting is incorrect - Normalize low idle speed
Restricted fuel pipes or hoses - Clean fuel hoses and pipes
Engine low compression: Worn or damaged valves - Valve replacement required
Engine knocking or noise
Timing of fuel injection pump is not adjusted - Check and correct settings
Damaged or clogged injector nozzles - Replace fuel injector nozzles
Lack of engine oil - Fill the crankcase with engine oil
Engine is not fully warmed up - Warm up the engine
Crankshaft or main bearings are worn out - Change defective components as required
Piston rings are damaged or broken - Replace the piston rings as required
Loose flywheel screws - Check the flywheel screws and tighten as required
Diesel engine consuming too much oil
External oil leaks: Seals or gaskets are wearing excessively - Change worn parts according to specifications
Wrong oil viscosity - Fill up with the correct oil viscosity
Damaged or seized piston rings - Piston rings replacement required
Worn valve guides and valve stems - Valves replacement required
Scuffed pistons or cylinder liners - Check pistons and liners, replace as required

Electrical System Troubleshooting
Battery is not charging
Battery dead cell - Change the battery
Battery electrical wire harness damage - Check battery wires for damage, replace or change
Loose or corroded battery cables and terminals - Cables and terminals must be tightened or cleaned
Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension properly or replace belt
Starter turns slowly
Low battery output - Low battery charging, charge as required
Battery won’t hold charge - Service charging system or change battery
Battery wiring harness damage - Inspect battery wiring for damage, replace or repair
Loose or corroded terminals and cables - Service or tighten battery cables and terminals
Starter does not work
Low battery output voltage - Battery is drained, recharge it
Drained or worn battery - Change or recharge battery
Damaged starter motor - Starter should be replaced
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Difficult to shift gears
Failure or improper clutch adjustment - Adjust correctly or replace
Gear shift linkage is stuck or worn - Service or change the shift linkage
Bent or worn shift forks - Shift forks need to be replaced
Faulty gear shifting mechanism - Faulty parts must be changed
Lack of transmission oil pressure
Fluid level is low - Check and refill the transmission fluid
Transmission oil filter element is dirty (if fitted) - Replace or clean transmission oil filter
Relief valve is defective - Change the valve
Transmission makes noise
Bearings are worn or damaged - Bearings need to be changed
Lack of transmission fluid supply - Fill up the transmission fluid
Transmission fluid contamination - Transmission fluid must be changed
Gears are worn or backlash is improper - Replace gears or set backlash properly
Shift forks are worn or damaged - Shift forks need to be changed
Transmission oil leakage
Gaskets or seals are broken - Gaskets or seal replacement required
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
Improper hydraulic pressure adjustments - Adjust it correctly
Main relief valve malfunction or incorrect adjustment - Replace or set up the relief valve
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings
Low hydraulic system pressure
Lack of hydraulic fluid - Add fluid to the hydraulic system
Hydraulic oil filter element clogging - Install a new hydraulic filter element
Hydraulic pump not working - Check pump flow and install new pump if necessary
Damaged or incorrect adjusted hydraulic spool valve - Replace or adjust correctly
Broken hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Leakage in hydraulic lines - Find leaks in the system and fix it
Hitch cannot be raised or raising is too slowly
Hydraulic fluid level is insufficient - Need to add fluid
Cold hydraulic fluid - Warm up the fluid
Hydraulic oil filter element clogging - Clean the hydraulic filter element or replace if necessary
Hydraulic pump failure - Check hydraulic pump flow and replace pump if necessary
Main relief valve is faulty or misadjusted - Adjust the valve or replace if necessary
Hydraulic control valve block is faulty or out of adjustment - Adjust properly or change
Hydraulic cylinder failure - Inspect cylinder parts for wear or damage and replace if required
Suction pipe is damaged or loose - Repair or change
3-point hitch won't drop or drops slowly
Defective or not adjusted hydraulic control valve - Change or adjust correctly
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hitch cross shaft is worn - Replace the shaft
Hitch has mechanical defects - Replace worn or damaged hitch components
Hitch raises or lowers not smoothly
Air leaks in hydraulic system - Inspect the pump seals, suction line, and fittings
Hydraulic fluid contamination - Change hydraulic fluid
Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary
Hydraulic control valve is faulty or out of adjustment - Replace or set properly
Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary

Steering System Troubleshooting
Steering wheel is hard to turn
Defective or improperly assembled steering column - Reassemble properly or change steering column
Air trapped in the steering system - Bleed air from system
Improper toe-in - Check and adjust toe-in
Front tires are worn out - Install new tires
Steering pump malfunction - Check the steering pump and replace if necessary
Power steering valve is worn or defective - Repair or replace the steering valve
Damaged steering box components - Defective power steering box components must be replaced
Steering oil level is insufficient - Checking steering oil level and add it if necessary
Steering system has oil leaks - Retighten steering pipe and hose connections
Excessive play in steering
Steering column coupling or shaft has maximum wear - Change defective part
Defective or worn power steering valve - Repair or change the steering valve
Worn steering box components - Change defective steering box components
Hydraulic steering pump is defective - Check the hydraulic steering pump and change if necessary
Steering linkage or tie-rod ends are defective - Change damaged component
Tractor is pulling to right or left
Tires are not properly inflated - Inflate tires as required
Improper toe-in adjustment - Check and adjust toe-in
Steering tie-rod ends or linkage are worn - Replace damaged part
Worn steering box components - Repair power steering box
Worn or damaged power steering valve - Repair or replace the steering valve
Front hub bearings are defective or improperly adjusted - 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