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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
