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John Deere D110 Troubleshooting

The John Deere D110 lawn tractor was manufactured from 2011 to 2017. The John Deere D110 driveline consists of a Briggs and Stratton 31P677 four-cycle single cylinder vertical shaft air-cooled gasoline engine and Kanzaki Tuff Torq T40 hydrostatic transmission.

The maximum travel speed (forward and reverse): 5.5 mph (8.8 km/h) / 3.2 mph (5.1 km/h). A 30.6 cubic inches (501 cc) engine output is 19.5 hp (14.5 kW) at 3600 rpm. The engine has a float carburetor, forced air cooling system and electronic ignition system.

The John Deere D110 lawn tractor is fitted with 15x6.00-6 front tires and 20x8.00-8 rear tires. The wheel base is 49 inches (1240 mm). The tractor can be equipped with the following attachments: a 42" mid-mount 2-blade mower deck, 44" two-stage front-mount snow blower, and 46" front blade with manual lift.

Engine Troubleshooting
Engine difficult to start or won't start
Fuel tank is empty - Add gasoline
Wrong fuel grade - Use quality fuel
Dirty fuel system - Check and clean
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change
Spark plug is faulty - Spark plug need to be replaced
Clogged fuel filter - Fuel filter needs to be replaced
Defective safety switch - Replace if required
Carburetor is clogged - Clean the carburetor
Poor cylinder compression - Check cylinder block and change worn parts
Incorrectly adjusted or damaged throttle cable - Replace cable or adjust correctly
Rough engine running
Cooling fins are blocked - Need to wash or clean
Ignition system malfunction - Check ignition system and replace faulty parts
Defective or stuck throttle cable - Clean or replace the cable
Air filter element is plugged - Replace or clean air filter
Fuel pump is defective or dirty - Clean or change fuel pump
Engine starts but then stalls
Damaged spark plug - Spark plug need to be replaced
Clogged or faulty carburetor - Replace or service carburetor
Ignition coil is defective - Replace ignition coil as necessary
Valve springs are weak or broken - Replace valve springs
Valves sticking - Service the valves
Engine keeps overheating
Engine oil level low - Need to add engine oil
Engine overload - Reduce engine load
Cooling fins are plugged - Need to wash or clean
Carburetor is running lean - Set the carburetor properly
Ignition timing is wrong - Set the ignition timing properly
Improper valve setting - Valves needs to be adjusted properly
Abnormal engine noise or knocking
Stale fuel - Use correct gasoline
Engine is under excessive load - Reduce load
Engine oil level low - Fill the crankcase with engine oil
Too low idle RPM - Adjust idling as required
Fuel pump is dirty or defective - Test fuel pump and replace if necessary
Main bearings or crankshaft wear - Worn parts replacement required
Improper valve clearance - Need to adjust valve clearance
Piston rings or cylinder bore are worn - Replace defective parts
Loss of engine power
Carburetor is clogged or improperly adjusted - Adjust the carburetor correctly or clean it
Dirty air filter element - Service or replace air filter
Clogged or defective fuel pump - Check fuel pump and replace if necessary
Ignition system is defective - Test ignition and replace failed parts
Cylinder head gasket is defective - Cylinder-head gasket replacement required
Valves are stuck or burned - Service or replace valves
Push rod is worn or defective - Change push rod
Worn cylinder block parts - Replace defective parts as required
Engine uses too much fuel
Throttle opening is not full - Adjust or change throttle cable
Incorrect carburetor main jet adjustment - Adjust main jet as required
Spark plug is defective or loose - Spark plug need to be tightened or replaced
Valves are stuck, burned, or worn - Clean or change valves
Worn sleeve, rings, or piston - Replace faulty components as required
Improper valve clearance - Need to adjust valve clearance
Engine oil consumption is too high
Gaskets or seals may be damaged - Worn parts need to be replaced
Valve guides and stems are worn - Change the valves
Piston rings are stuck or broken - Install new piston rings
Scuffed piston or cylinder liner - Check liner and piston, install new components as required
Blocked breather pipe or hose - Clean or replace

Hydrostatic Transmission Troubleshooting
HST transmission makes excessive noise
Worn or unadjusted speed control linkage - Change or adjust linkage
Transmission overloaded - The load should be reduced
Fluid is contaminated or fluid level is insufficient - Pour fresh fluid or add transmission fluid to proper level
Worn or defective transmission components - Check transmission components and change if necessary
Shifting is hard
Shift linkage is worn or rusty - Replace or lubricate the linkage
Hydrostatic pump is defective or blocked - Change or repair pump
Worn or misadjusted transmission shift control parts - Adjust correctly or replace
Lack of power
Insufficient transmission oil - Need to add transmission oil
Faulty or worn drive sheave - Change sheave
Shift linkage is unadjusted or damaged - Change or adjust linkage
Speed control pedal linkage is bent or not adjusted - Repair or adjust linkage
Transmission leaking
Transmission gaskets or seals are worn - Install new gaskets or seals
Final drive shaft is leaking - Replace shaft seals
Transmission housing is cracked - Replace damage housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates excessively
Mower deck drive sheave is clogged or worn - Clean or change sheave
Drive belt is damaged or loose - Belt needs to be adjusted or replaced
Bent or unbalanced cutting blades - Replace or balance blades
Blade mounting bolts are loose - Bolts need to be tightened
Constant clogging of discharge chute
High ground speed - Select a slower speed
Long grass - Use a lower cutting height
Engine is running at too low speed - Adjust throttle to full opening
Cutting level is too low - Use correct cutting height
Mower deck drive belt installed incorrectly - Reinstall drive belt properly
Lawn mower leaving uncut grass
Clogged mower deck - Check cutting deck and clean as necessary
Blades are excessively dull - Blades need to be sharpened
Damaged or worn blades - Blades must be changed
Ground speed is too fast - Operate at slower speed
Low cutting height - Use correct cutting height
Bagger is overfilled - Remove grass from bagger
Blades are scalping the grass
Lawn is uneven or bumpy - Roll or level the lawn
Low cutting height - Must be set to high cutting height
Fast ground speed - Need to slow down
Deck level is not correct - Adjust the level of mower deck correctly
Worn or bent blades - Install new blades
Low tire pressure - Check and inflate the tires
Mower deck to cut unevenly
Tires are not properly inflated - Inflate tires as required
Improper mower deck level - Deck should be adjusted correctly
Excessive blade dullness - Blades need to be sharpened
Damaged or worn blades - Blades must be changed
Discharge chute is plugged - Clean mower deck as required
Deck shell is damaged - Replace or repair the deck
Mower spindle is bent or loose - Repair or change the spindle

Electrical Troubleshooting
Battery is not charging
Loose or corroded wire connections - Tighten or service cable connections
Battery terminal connectors are defective - Terminal connectors should be replaced
Defective battery - Use a new battery
Starter cranks slow
Low battery capacity - Charge the battery
Battery runs out quickly - Battery needs service or replacement
Terminals are faulty or battery cables are disconnected - Connect wires correctly or change terminals
Starter motor is not working
Battery is low or faulty - Recharge or change battery
Battery cables are disconnected or improperly connected - Inspect cables and connect properly
Low battery capacity - Charge the battery
Spark plug dirty or improperly gapped - Clean, gap or change spark plug
Damaged starter motor or solenoid - Change solenoid or repair starter




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