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John Deere 1070 Troubleshooting

The John Deere 1070 compact utility tractor was manufactured from 1989 to 1998. The John Deere 1070 driveline system components: Yanmar 4TN84 4-cycle 4-cylinder direct injection liquid-cooled diesel engine and partially synchronized transmission with 9 forward and 2 reverse gears.

A 116.3 cu.in (1.9 L) engine has a cylinder bore of 3.31" (84 mm), piston stroke of 3.39" (86 mm), and rated power of 38.5 hp (28.7 kW). The maximum travel speed (forward/reverse): 12.3 mph (19.8 kph) and 4.8 mph (7.7 kph). The open center hydraulic system includes a gear pump with a flow rate of 9 gal/min (34.2 l/min).

The main relief pressure is 155 bar (2250 psi). The 2-wheel drive models are equipped with 6.00x16 front tyres and 13.6x24 rear tyres. The 8.00x16 or 27x8.50-15 front tyres and 13.6x28 or 44x18.00-20 rear tyres fit 4-wheel drive tractors. The wheelbase is 68.9 in (1750 mm).

The John Deere 1070 tractor is compatible with the following attachments: a 72.8" mid-mount 3-blade mower deck with cutting height of 1.5-8.6 in (38-215 mm) and hydraulic lift system, 84" front-mount blade with lifting height of 12 in (305 mm), John Deere 80 loader with lift capacity to full height of 1175 lbs (532 kg), and John Deere 8A backhoe with 2-ft flat digging depth of 102" (2590 mm).

Engine Troubleshooting
Diesel will not start or hard to start
Plugged fuel filter - Change filter element
Fuel shut-off valve closed - Open the fuel shut-off valve
Fuel lines leaking air - Tighten clamps, change faulty pipes
Clogged fuel injectors - Change fuel injectors
Fuel injection pump damage - Rebuild or replace pump
Poor engine compression - Check cylinder block and change worn components
Engine shuts off unexpectedly while running
Engine is not warmed up to the required temperature - Warm up to required temperature
Air in fuel lines - Bleed fuel lines
Fuel injection failed - Use correct settings
Fuel filter clogging - Replace the filter element
Fuel injectors are defective or dirty - Test fuel injectors and change if necessary
Diesel starts and immediately shuts off
Unadjusted fuel injection pump timing - Check and correct adjustments
Fuel filter plugging - Clean the filter element
Fuel injector nozzles are dirty - Check and change nozzles as required
Fuel injection pump is damaged - Replace or repair injection pump
Dirty air cleaner element - Replace or clean the air cleaner element
Engine stops while idling
Low idle speed setting is incorrect - Adjustment required
Fuel injection pump is defective - Rebuild or install a new injection pump
Clogged or defective injector nozzles - Service or replace injector nozzles
Valve out of adjustment - Adjust valve clearance
Engine overheated
Low coolant level - Fill radiator to proper level. Check the components of cooling system
Cooling system is dirty or cooling components are failed - Service the cooling system or replace faulty components
Low engine oil level - Check and refill engine oil
Fan belt tension is incorrect or belt is defective - Adjust properly or change the belt
Defective thermostat - Check and replace if required
Lack of engine power
Faulty or dirty injectors - Clean or replace fuel injectors
Fuel injection pressure is wrong - Adjust to correct pressure
Air filter element is clogged - Replace or service air filter element
Dirty oil filter - Service or change engine oil filter element
Diesel engine is overloaded - Shift to lower gear or reduce the load
Incorrect valve clearance - Adjustment procedure required
Incorrectly set low idle speed - Correct low idle adjustment
Fuel pipes or hoses clogging - Fuel pipes and hoses need to be cleaned
Poor engine compression: Valves are defective or worn - Valves need to be replaced
Abnormal engine noise or knocking
Incorrectly set fuel injection pump timing - Correct injection timing
Dirty or defective injector nozzles - Service or replace injector nozzles
Lack of engine oil - Add oil to the engine crankcase
Low coolant temperature - Engine is not warmed up to the required temperature
Crankshaft or main bearings wear - Need to install new components
Damaged or defective piston rings - Piston rings replacement required
The flywheel to crankshaft bolts are loose - Tighten bolts as required
Engine oil consumption is too high
Oil leaking: Worn seals or gaskets - New components need to be installed
Wrong oil viscosity - Use correct viscosity oil
Piston rings are stuck or worn - Piston rings need to be replaced
Valve stems or guides are damaged - Change the valves
Damaged pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary

Electrical System Troubleshooting
Battery cannot be charged
Bad cell in battery - Change the battery
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Corroded or loose cables and terminals - Service or tighten battery terminals and cables
Belt damage or incorrect belt tension adjustment - Adjust belt tension correctly or replace belt
Starter motor cranks slow
Low battery output - Recharge the battery
Battery does not hold charge - Battery needs to be serviced or replaced
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose terminals and cables - Clean or tighten terminals and cables
Starter is not working
Low battery output - Charge the battery
Discharged or defective battery - Battery needs to be recharged or replaced
Starter motor is defective - Repair or replace starter
Improperly connected or disconnected cables - Check battery cables and connect properly

Transmission Troubleshooting
Gear shift is hard
Worn or incorrectly adjusted clutch - Change or adjust clutch
Gear shift linkage is damaged or loose - Repair or change shift linkage
Damaged or worn shift forks - Install new shift forks
Gear shifting mechanism is worn - Change worn components
Insufficient transmission fluid pressure
Oil level is low - Fill up the transmission oil
Transmission oil filter is plugged (if fitted) - Change or clean the transmission oil filter
Faulty relief valve - Replace relief valve as required
Transmission makes excessive noise
Bearings are worn or broken - Change faulty bearings
Not enough fluid in transmission - Add transmission fluid as required
Transmission oil contamination - Fill up with fresh transmission oil
Backlash is incorrect or gears are worn - Replace gears or set backlash correctly
Damaged or worn shift forks - Replace the shift forks
Transmission fluid leaks
Seals or gaskets are damaged - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system overheated
Hydraulic system pressure is not corrected - The pressure must be adjusted correctly
Defective or misadjusted main relief valve - Adjust or change relief valve
Hydraulic oil contamination - Change the oil
Hydraulic system sucks air - Check the pump seals, suction line, and fittings
Low hydraulic system pressure
Hydraulic fluid level is low - Fill the hydraulic system with oil
Hydraulic fluid filter is dirty - Replace hydraulic filter element or service if necessary
Hydraulic pump failure - Check pump flow and change pump if necessary
Hydraulic control valve is not set properly or defective - Replace or adjust properly
Faulty hydraulic cylinder - Inspect cylinder parts for wear or damage and replace if required
Leakage in hydraulic pipes - Find leaks in hydraulic system and repair it
Hitch cannot be lifted or lifting is too slow
Lack of hydraulic oil - Add oil to the hydraulic system
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter element is dirty - Install a new hydraulic filter element
Hydraulic pump failure - Check pump capacity and change if necessary
Main relief valve incorrect adjustment or failure - Adjust relief valve or change if required
Hydraulic spool valve block is defective or set improper - Replace or adjust properly
Hydraulic cylinder is broken - Inspect cylinder components for wear or damage and change if required
Damaged or disconnected suction pipe - Connect or replace
Hitch not dropping or hitch drops slowly
Damaged or incorrect adjusted hydraulic control valve - Replace or set properly
Faulty hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Damaged lift arm shaft - Replace the shaft
Hitch has mechanical defects - Replace worn or faulty hitch components
Hitch is lowered or raised jerkily
Air in hydraulic system - Check the pump seals, suction line, and fittings
Contaminated hydraulic oil - Change hydraulic oil
Hydraulic pump is faulty - Test the pump performance and change pump if required
Hydraulic control valve block is faulty or out of adjustment - Adjust properly or replace
Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required

Steering System Troubleshooting
Hard Steering
Steering column is defective or improperly assembled - Change steering column or assemble properly
Air trapped in the steering system - Air-bleed steering system
Improper toe-in - Check and adjust toe-in
Tires are deflated - Need to inflate tires
Steering pump failure - Steering pump needs to be repaired or replaced
Power steering valve is defective or worn - Change or repair steering valve if required
Faulty or stuck relief valve - Replace or install new relief valve
Steering oil insufficient - Check and refill steering oil
Oil leakage in the steering system - Tighten connections of hydraulic hoses and pipes in steering system
Excessive free play of steering wheel
Steering column shaft or coupling has maximum wear - Replace faulty component
Damaged or worn power steering valve - Inspect and change as required
Faulty steering pump - Steering pump needs to be replaced or repaired
Worn or faulty steering tie-rod ends or linkage - Replace failed component
Tractor is pulling to right or left
Low tire pressure - Inflate the tires
Toe-in adjustment is incorrect - Check and adjust toe-in
Faulty or worn steering linkage or tie-rod ends - Change failed part
Damaged or worn power steering valve - Replace or repair steering valve as required
Power steering cylinder is damaged - Repair or replace steering cylinder
Front hub bearings are worn or incorrectly adjusted - Change or adjust the bearings properly




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