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John Deere 314 Troubleshooting

The John Deere 314 is a 2WD garden tractor from 300-series. This model was manufactured between 1979 and 1983. The John Deere driveline includes a Kohler K321AQS 4-cycle one cylinder air-cooled gasoline engine and Sundstrand 15 shaft-driven hydrostatic transmission with infinite forward and reverse gears.

A 31.3 cubic inches (512 cc) engine has a cylinder bore of 3.50" (89 mm), piston stroke of 3.25" (82.6 mm), and rated power of 14 hp (10.5 kW). The maximum forward speed - 6.8 mph (10.9 km/h), maximum reverse speed - 3.8 mph (6 km/h).

The John Deere 314 garden tractor is equipped with a manual steering system, shoe brakes, 16x6.50-8 front tires, and 23x10.50-12 rear tires. The wheelbase is 46 inches (1160 mm). Compatible attachments for the tractor: 38", 46" mid-mount 3-blade right-discharge mower decks with hydraulic lift system, 54" front-mount blade, 46" front-mount single-stage snow blower.

Engine Troubleshooting
Engine won't start or difficult to start
Empty gas tank - Fill it up
Improper fuel grade - Use quality gasoline
Air in fuel tank - Bleed fuel tank
Disconnected or loose spark plug wire - Check the spark plug wire connection, repair or replace
Spark plug is damaged - Spark plug need to be replaced
Fuel filter is clogged - Change fuel filter
Faulty safety switch - Change damaged switch
Carburetor is not adjusted - Check carburetor float adjustment
Low cylinder compression - Check cylinder block and replace worn parts
Worn or unadjusted choke cable - Change cable or adjust correctly
Rough engine running
Cooling fins are plugged - Clean and wash as required
Ignition system problems - Check ignition and replace faulty components
Choke cable is stuck or defective - Replace or clean the cable
Dirty air filter element - Clean or replace air filter
Clogged or defective fuel pump - Service or replace fuel pump
Engine starts but immediately shuts off
Spark plug is faulty - Replace spark plug
Clogged or defective carburetor - Service or repair carburetor
Ignition coil is faulty - Ignition coil must be replaced
Broken or bad valve springs - Install new valve springs
Valves sticking - Valves need to be cleaned
Engine overheats
Low engine oil level - Check and refill engine oil
Excessive engine load - Load reducing is recommended
Air intake screen is plugged - Need to clean or wash
Carburetor is running lean - Use proper settings
Improper ignition timing - Ignition timing needs to be adjusted correctly
Valve setting is improper - Valves needs to be adjusted properly
Engine noises or knocks
Stale fuel - Use correct fuel
Engine overloaded - Load reducing is recommended
Engine oil level is low - Check oil level and add oil as required
Improperly adjusted low idle speed - Adjust the low idle speed
Fuel pump is dirty or defective - Service or change fuel pump
Crankshaft or main bearings are worn out - Have bearings or crankshaft replaced
Excessive valve clearance - Need to adjust valve clearance
Damaged piston rings or cylinder bore - Replace defective components
Engine power is too low
Carburetor is incorrectly adjusted or clogged - Clean or correctly adjust carburetor
Air filter element is plugged - Replace or clean air filter
Fuel pump is damaged or dirty - Check fuel pump and change if required
Ignition failure - Test ignition and replace failed parts
Cylinder head gasket is worn - Install new cylinder head gasket
Burned or stuck valves - Replace or service valves
Damaged or worn push rod - Push rod needs to be changed
Damaged cylinder block parts - Defective components need to be replaced
Engine using too much gasoline
Throttle not fully open - Check throttle cable and adjust as required
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet correctly
Loose or defective spark plug - Spark plug need to be tightened or replaced
Stuck, worn, or burned valves - Clean or replace valves
Sleeve, rings, or piston are damaged - Change defective parts
Valve clearance is improper - Check and adjust
Excessive engine oil consumption
Seals or gaskets are wearing excessively - Replace defective parts
Valve guides and stems are worn - Install new valves
Piston rings are stuck or worn - Piston rings need to be replaced
Scuffed piston or cylinder liner - Check liner and piston, change as required
Blocked breather pipe or hose - Change or clean

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission is making noise
Bent or unadjusted speed control pedal linkage - Adjust or replace linkage
Excessive loading - Reduce the load is required
Fluid is contaminated or fluid level is insufficient - Pour fresh fluid or add transmission fluid to proper level
Defective or worn transmission parts - Check transmission parts for damage or wear and replace if required
Shifting is hard
Stuck or damaged gshift linkage - Replace or repair the linkage
Hydrostatic pump is defective or blocked - Repair or replace pump
Defective or unadjusted transmission shift control components - Adjust correctly or replace
Low power
Transmission fluid insufficient - Add fluid to the transmission housing
Drive sheave is worn or faulty - Replace sheave
Shifting linkage is broken or misadjusted - Adjust properly or replace linkage
Worn or unadjusted speed control linkage - Change or adjust linkage
Transmission leaking
Damaged transmission seals or gaskets - Replace seals or gaskets
Leaking final drive shaft - Replace shaft seals
Cracked transmission case - Install a new transmission case

Mower Deck Troubleshooting
Mower vibration is excessive
Worn or dirty mower drive pulley - Change or clean pulley
Drive belt is damaged or loose - Belt needs to be adjusted or replaced
Bent or unbalanced cutting blades - Balance or change as needed
Loose blade mounting bolts - Tighten it fast
Discharge chute is constantly plugged
High ground speed - Select a lower speed
Grass is too long - Use a lower cutting height
Low engine speeds - Choke is not fully opening
Cutting level is too low - Change cutting height adjustment
Mower deck drive belt installed incorrectly - Check drive belt for correct installation
Streaking of uncut grass
Deck is plugged with grass - Check cutting deck and clean as necessary
Not sharp blades - Blades need to be sharpened
Damaged or worn blades - Replace the blades
Fast mowing speed - Use a slower speed
Cutting level is too low - Use correct cutting height
Bagger is overfilled - Bagger must be empty
Blades scalping grass
Lawn is uneven or bumpy - Lawn leveling required
Cutting level is too low - Use a higher cutting height
Fast mowing speed - Select a slower speed
Deck level is not correct - Level the deck properly
Worn or bent blades - Install new blades
Low tire pressure - Check and inflate the tires
Mower deck to cut unevenly
Low tire pressure - Inflate tires as required
Improperly leveled mower deck - Deck should be adjusted correctly
Blades are too dull - Need a blade sharpening
Blades are worn or damaged - Install new blades
Discharge area is clogged - Inspect and clean cutting deck
Deck shell is damaged - Rebuild or change mower deck
Loose or faulty mower spindle - Change or repair the spindle

Electrical Troubleshooting
Battery won’t charge
Loose or corroded electrical wiring connections - Clean or tighten connections
Faulty battery terminal clamps - Terminal clamps should be changed
Faulty cell in battery - Change the battery
Starter cranks slowly
Low battery output voltage - Battery is drained, recharge it
Battery drains quickly - Service or change the battery
Disconnected battery cables or bad terminals - Connect wires properly or change terminals
Starter motor won't turn
Battery is drained or defective - Charge or replace the battery
Battery cables are disconnected or improperly connected - Inspect cables and connect properly
Low battery output voltage - Charge the battery
Incorrectly gapped or worn spark plug - Clean, gap or replace spark plug
Solenoid or starter motor is faulty - Replace solenoid or repair starter




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