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