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John Deere 6400 Troubleshooting
The
John Deere 6400 is a 4WD (4x4) farm tractor. This model was manufactured from
1992 to 1998. The JD 6400 tractor is powered by 276 cu.in (4.5 L) John Deere
4045TL four-cylinder turbocharged diesel engine with a rated power of 100 hp
(74.6 kW) and 404 Nm (298 lb-ft) of peak torque at 1540 rpm.
The John Deere 6400 tractor is equipped with 4 types of transmission.
Type 1: 12x4 SyncroPlus fully synchronized transmission. Type 2: 15x5
SyncroPlus fully synchronized transmission. Type 3: 16x16 PowrQuad
partial power shift transmission. Type 4: 20x20 PowrQuad partial power
shift transmission.
Max. forward speed - 18.7 mph (30.1 km/h), maximum reverse speed - 18.6
mph (29.9 km/h). The closed center pressure-flow compensating hydraulic
system includes a variable displacement pump with fluid flow rate of
15.9 gal/min (60 l/min). The main relief pressure is 2900 psi (200 bar).
The tractor is fitted with 13.6x28 front tires and 16.9x38 rear tires.
The wheelbase is 94.5 in (2400 mm).
The JD 6400 tractor can be equipped with the following attachments: John
Deere 620 loader with lift capacity to max height of 2707 lbs (1227 kg),
and John Deere 640 SL loader with lift capacity to max height of 3243
lbs (1471 kg).
| Engine Troubleshooting |
| Engine doesn't start or starts hard |
| Dirty fuel filter element - Service the filter |
| Closed fuel cock - Open fuel on-off cock to inject fuel |
| Air in fuel lines - Bleed fuel lines |
| Dirty or faulty injectors - Test fuel injectors and change if necessary |
| Fuel injection pump damage - Rebuild or install a new injection pump |
| Poor cylinder compression - Inspect and replace faulty parts |
| Engine stops during operation |
| Low coolant temperature - Warm up the engine |
| Fuel-line is leaking air - Retighten clamps, replace defective pipes |
| Uneven fuel injections - Repair or adjustment |
| Fuel filter is clogged - Change filter element |
| Fuel injectors are defective or dirty - Check fuel injectors and replace if required |
| Engine starts and stalls immediately |
| Fuel injection pump out of timing - Correct injection timing |
| Clogged fuel filter element - Change the filter element |
| Fuel injector nozzles are damaged or dirty - Test injector nozzles and replace as required |
| Fuel injection pump malfunction - Install a new fuel pump or repair |
| Air cleaner clogging - Service or change air cleaner |
| Wrong adjustment of low idle speed - Adjust as required |
| Fuel injection pump is faulty - Install a new fuel pump or repair |
| Clogged or defective injector nozzles - Service or replace nozzles if required |
| Valve clearance is wrong - Check and adjust as required |
| Insufficient coolant - Add the coolant. Check for leaks or other malfunctions |
| Cooling system is dirty or cooling components are damaged - Flush cooling system or change faulty components |
| Engine oil insufficient - Fill up the oil to required level |
| Improper fan belt tension or damaged belt - Adjust properly or change the belt |
| Thermostat malfunction - Check thermostat, replace if necessary |
| Fuel injectors are clogged or faulty - Test fuel injectors and change if necessary |
| Fuel injection pressure is wrong - Adjust to correct pressure |
| Clogged air filter - Replace filter or install new filter element |
| Clogged oil filter element - Clean or change engine oil filter |
| Diesel engine is overloaded - Reduce load on the engine |
| Valve clearance is out of adjustment - Adjustment procedure required |
| Improperly adjusted low idle speed - Adjust low idling as recommended |
| Clogged fuel pipes or hoses - Clean fuel hoses and pipes |
| Engine lost compression: Valves are broken or leaking - Install new valves |
| Abnormal engine knocking or noise |
| Incorrect setting of fuel injection pump timing - Check the fuel injection pump timing setting |
| Fuel injector nozzles are dirty - Inspect injector nozzles and change if required |
| Engine oil level is insufficient - Checking oil level and add if necessary |
| Engine not warmed up - Engine is not warmed up to the required temperature |
| Crankshaft or main bearings are worn out - Change defective components as required |
| Piston rings are damaged or broken - Piston rings replacement required |
| Flywheel bolts are loose - Bolts need to be tightened |
| Oil leaking: Gaskets or seals are excessively worn - Change to repair leaks |
| Oil viscosity is incorrect - Fill up with the proper oil viscosity |
| Damaged or seized piston rings - Replace piston rings |
| Valve stems and guides are worn - Need to replace the valves |
| Pistons or cylinder liners are damaged - Inspect liners and pistons, replace as necessary |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery faulty cell - Battery change required |
| Battery wiring harness failure - Inspect electrical cables for defects, repair or replace |
| Loose or corroded battery terminals and cables - Tighten or service terminals and cables |
| Worn belt or improperly adjusted belt tension - Adjust belt tension properly or replace belt |
| Low battery capacity - Battery is drained, charge it |
| Battery is not holding charge - Service or change the battery |
| Battery electrical wire harness damage - Check battery wires for damage, replace or change |
| Battery cables and terminals are loose or corroded - Tighten or service terminals and cables |
| Low battery voltage - Battery needs to be recharged |
| Discharged or worn battery - Battery needs to be recharged or replaced |
| Starter motor is defective - Replace or repair starter |
| Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly |
| Transmission Troubleshooting |
| Hard to shift gears |
| Clutch is not adjusted or faulty - Clutch replacement or adjustment required |
| Gear shift linkage is loose or broken - Repair or change shift linkage |
| Shift forks are damaged or worn - Replace defective shift forks |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Low transmission pressure |
| Oil level is low - Check transmission oil level and add oil as required |
| Dirty transmission oil filter (if fitted) - Change or clean the transmission oil filter |
| Faulty relief valve - Replace the valve |
| Transmission makes excessive noise |
| Broken or worn bearings - Bearings need to be changed |
| Insufficient fluid supply - Add transmission fluid as required |
| Dirty transmission oil - Transmission oil must be changed |
| Improper backlash or damaged gears - Replace gears or set backlash properly |
| Bent or worn shift forks - Shift forks need to be changed |
| Broken gaskets or seals - Change defective gaskets or seal |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system overheated |
| Hydraulic system pressure is not set correctly - Set the hydraulic pressure as required |
| Main relief valve malfunction or incorrect adjustment - Adjust relief valve or change if required |
| Contaminated hydraulic oil - Change hydraulic oil |
| Air in hydraulic system - Inspect the pump seals, suction line, and fittings |
| Hydraulic oil pressure is low |
| Hydraulic fluid level is insufficient - Fill the hydraulic system with oil |
| Hydraulic fluid filter is dirty - Replace filter element or clean if required |
| Hydraulic pump is faulty - Flow-rate hydraulic pump and replace pump if necessary |
| Defective or not adjusted hydraulic spool valve - Replace or set properly |
| Faulty hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Hydraulic piping leaks - Detect leaks in the system and fix it |
| 3-point hitch does not raise or raises very slowly |
| Lack of hydraulic oil - Check oil level and add hydraulic oil as required |
| Hydraulic oil is too cold - Allow oil to warm |
| Hydraulic fluid filter is dirty - Clean or change hydraulic filter |
| Hydraulic pump not working - Check pump performance and change it if necessary |
| Main relief valve incorrect adjustment or failure - Adjust or change relief valve |
| Hydraulic spool valve block is defective or set improper - Adjust correctly or change |
| Broken hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
| Loose or damaged suction line - Tighten or replace |
| Hitch can't drop or drops too slowly |
| Hydraulic control valve block is defective or set improper - Replace or adjust properly |
| Hydraulic cylinder is faulty - Inspect cylinder components for wear or damage and change if required |
| Worn lift arm shaft - Replace the shaft |
| Hitch has mechanical defects - Change defective or worn hitch components |
| Hitch lowering or lifting is not smoothly |
| Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
| Hydraulic oil contamination - Change the oil |
| Damaged hydraulic oil pump - Check pump flow and install new pump if necessary |
| Hydraulic control valve block is not set properly or defective - Change or adjust properly |
| Broken hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary |
| Steering System Troubleshooting |
| Steering is stiff |
| Steering column is broken or improperly installed - Steering column must be installed properly or replaced |
| Air leaks in steering system - Bleed the system of air |
| Incorrect toe-in adjustment - Adjust toe-in properly |
| Tire pressure is improper - Inflate the tires properly |
| Steering pump failure - Check the hydraulic steering pump and change if necessary |
| Damaged or worn hydrostatic steering unit - Check and replace as required |
| Steering oil level is insufficient - Checking steering oil level and add it if necessary |
| Steering system has oil leaks - Retighten the connections of the hydraulic steering lines and hoses |
| Excessive steering wheel free play |
| Steering column shaft or coupling is worn out - Replace defective part |
| Hydrostatic steering unit is defective or worn - Inspect and change as required |
| Steering pump is worn - Check the steering pump and replace if necessary |
| Faulty or worn steering tie-rod ends or linkage - Change damaged component |
| Tractor is pulling to left or right |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Not adjusted toe-in - Check toe-in and correct |
| Worn or faulty steering tie-rod ends or linkage - Change damaged part |
| Hydrostatic steering unit is defective or worn - Replace or repair steering unit as required |
| Steering cylinder damage - Repair or replace steering cylinder |
| Front hub bearings are improperly adjusted or defective - Adjust correctly or install new bearings |
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| Farm Tractors Technical Specifications |
