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John Deere D105 Troubleshooting

The John Deere D105 is a lawn tractor from D100 series. This model was manufactured between 2013 and 2017. The John Deere D105 driveline includes a Briggs and Stratton Intek 31G777 four-cycle 1-cylinder OHV vertical shaft air-cooled gasoline engine and RT400 belt-driven mechanical CVT transmission.

A 30.5 cubic inches (500 cc) engine has a cylinder bore of 3.56" (91 mm), piston stroke of 3.06" (78 mm), and rated power of 17.5 hp (13 kW). Max. travel speed (forward/reverse): 5 mph (8 kph) and 2.3 mph (3.7 kph).

The John Deere D105 is equipped with a manual steering system, disc brakes, 15x6.00-6 front tires, and 20x8.00-8 rear tires. The wheelbase is 49 inches (1240 mm). The tractor is compatible with a 42" mid-mount 2-blade mower deck with cutting height of 1-4" (25-101 mm) and manual lifting system, 46" front blade, 44" front-mount snow blower with mechanical lift.

Engine Troubleshooting
Engine difficult to start or will not start
No gasoline in tank - Add gasoline
Low-quality gasoline - Use quality fuel
Air in fuel system - Bleed fuel system
Faulty spark plug wire connection - Check spark plug wiring connection, repair or change
Defective spark plug - Change spark plug
Fuel filter is dirty - Change fuel filter
Safety contact for brake pedal defective - Install new part
Carburetor settings incorrect - Adjusting as required
Low cylinder compression - Check cylinder block and replace worn parts
Worn or improperly adjusted choke cable - Adjust properly or replace the cable
Unstable engine running
Cooling fins are blocked - Clean and wash as required
Defective ignition - Inspect ignition system and change failed components
Defective or stuck throttle cable - Service or change the cable
Clogged air filter - Service or change air filter
Clogged or defective fuel pump - Service or change fuel pump
Engine starts and then shuts off
Spark plug is defective - Install new spark plug
Defective or clogged carburetor - Clean or replace carburetor
Ignition coil is not working - Change ignition coil as required
Worn or loose valve springs - Install new valve springs
Valves sticking - Valves must be cleaned
Engine overheating
Engine oil level low - Need to add engine oil
Excessive engine load - Load reducing is recommended
Cooling fins are clogged - Need to wash or clean
Carburetor mixture is too lean - Adjust carburetor properly
Ignition timing is improper - Adjust ignition timing as required
Improper valve setting - Valves needs to be adjusted properly
Engine knocking sound or abnormal noise
Stale gasoline - Use proper fuel
Excessive engine load - Reduce the load
Low engine oil level - Check and refill engine oil
Incorrect low idle setting - Adjust the low idle speed
Fuel pump is defective or dirty - Service or replace fuel pump
Main bearings or crankshaft wear - Repair or replace defective parts
Valve clearance is incorrect - Check and adjust
Cylinder bore or piston rings are damaged - Replace faulty components
Engine loses power
Carburetor is dirty or improperly adjusted - Service or correctly adjust carburetor
Air filter is dirty - Replace or service air filter
Fuel pump is damaged or dirty - Test fuel pump and replace if necessary
Ignition system failure - Inspect ignition system and change faulty parts
Blown cylinder head gasket - Replace cylinder head gasket
Burned or stuck valves - Replace or service valves
Worn or defective push rod - Push rod needs to be changed
Faulty cylinder block components - Change defective components
Engine using too much gasoline
Throttle not fully open - Check throttle cable and adjust as required
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet properly
Defective or loose spark plug - Spark plug need to be replaced or tightened
Valves are worn, burned or stuck - Service or replace valves
Sleeve, piston, or rings are damaged - Replace defective components
Improper valve clearance - Check and adjust
Engine using too much oil
Gaskets or seals may be damaged - Worn parts need to be replaced
Valve guides and stems are worn - Valves need to be changed
Damaged or seized piston rings - Change the piston rings as required
Cylinder liner or piston is worn - Inspect liner and piston, change as necessary
Clogged breather pipe or hose - Service or change

Automatic Transmission Troubleshooting
Automatic transmission is excessively noisy
Defective or not adjusted speed control pedal linkage - Adjust or repair linkage
Excessive loading - The load should be reduced
Dirty transmission fluid or insufficient fluid level - Add fluid to correct level or fill the transmission with fresh fluid
Transmission components are damaged or worn - Change or repair defective parts
Shifting is hard
Shift linkage is loose or broken - Service or change the linkage
Hydrostatic pump is stuck or worn - Repair or replace pump
Misadjusted or faulty transmission shift control components - Replace or adjust as required
Power is too low
Transmission fluid level is low - Checking transmission fluid level and add if necessary
Worn or damaged drive sheave - Install a new sheave
Shifter linkage is faulty or not adjusted - Change or adjust linkage
Defective or not adjusted speed control pedal linkage - Adjust or replace linkage
Transmission leaking
Transmission gaskets or seals are worn - Seals and gaskets need to be replaced
Final drive shaft leaks - Install new shaft seals
Transmission case is cracked - Replace case or transmission assembly

Mower Deck Troubleshooting
Excessive mower vibration
Worn or dirty mower drive pulley - Replace or clean pulley
Loose or defective drive belt - Adjust belt tension or install a new belt
Unbalanced or warped mower blades - Replace or balance blades
Loose blade mounting bolts - Bolts should be tightened
Discharge chute is constantly plugged
Mowing speed is too high - Select a slower speed
Grass is too long - Use a lower cutting height
Engine is running at too low speed - Adjust throttle to full opening
Cutting level is too low - Change cutting height adjustment
Drive belt installed improperly - Install drive belt correctly
Patches of grass uncut
Deck clogged with grass clippings - Mower deck needs to be cleaned
Blades are not sharp - Blades need to be sharpened
Blades are defective or worn - Replace the blades
High mowing speed - Operate at slower speed
Mower deck set to low cutting - Use a higher cutting height
Grass bag is full - Empty the grass bag
Blade scalped grass
Uneven or bumpy lawn - Roll or level the lawn
Mower deck set to low cutting - Use correct cutting height
Ground speed is too fast - Use a lower speed
Incorrectly leveled mower deck - Deck should be adjusted correctly
Damaged or bent blades - Replace the blades
Tires are not correctly inflated - Inflate tires as required
Mower deck to cut unevenly
Low tire pressure - Check and inflate the tires
Incorrectly leveled mower deck - Adjust mower deck level properly
Blades are not sharp - Sharpen the blades
Blades are defective or worn - Change the blades
Cutting deck clogging - Check cutting deck and clean as necessary
Broken mower deck shell - Repair or change the deck
Mower spindle is loose or defective - Install new spindle or repair it

Electrical Troubleshooting
Battery does not charge
Electrical cable connections are loose or corroded - Tighten or service connections
Battery terminal clamps are faulty - Terminal clamps need to be replaced
Battery is defective - Battery replacement required
Starter turns slow
Low battery power - Battery is drained, recharge it
Battery runs out quickly - Service charging system or change battery
Disconnected cables or faulty battery terminals - Connect wiring correctly or install new terminals
Starter will not work
Battery is low or faulty - Need to charge or replace the battery
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly
Low battery capacity - Recharge the battery
Spark plug gapped improperly or faulty - Clean, gap or change spark plug
Defective solenoid or starter motor - Starter/solenoid should be replaced




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