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John Deere D140 Troubleshooting
The
John Deere D140 lawn tractor was manufactured from 2011 to 2017. The John Deere
D140 tractor is powered by 40.03 cu.in (656 cc) Briggs and Stratton 407777
4-cycle V-twin cylinder OHV vertical-shaft air-cooled gasoline engine with a
rated power of 21 hp (15.7 kW), or 44.2 cu.in (724 cc) Briggs and Stratton
44S677 4-cycle V-twin cylinder OHV vertical-shaft air-cooled gasoline engine
with a rated power of 22 hp (16.4 kW).
The JD D140 is equipped with Tuff Torq T40 belt-driven hydrostatic
transmission with infinite forward and reverse gears. The maximum
forward speed - 5.5 mph (8.8 km/h), maximum reverse speed - 3.2 mph (5.1
km/h). The lawn tractor is equipped with a manual steering system,
mechanical shoe brakes, 15x6.00-6 front tires, and 20x10.00-8 rear
tires. The wheel base is 49" (1240 mm).
Compatible attachments for John Deere D140: a 48" mid-mount 3-blade
mower deck with cutting height of 1.0-4.0" (25-102 mm), 13 cut
positions, and manual lift with assist spring, 46" front blade with lift
height of 6.5" (160 mm), and 44" front-mount dual-stage snowblower with
clearing height of 18" (450 mm).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Empty gas tank - Fill gasoline up |
| Low-quality gasoline - Use quality fuel |
| Air in the fuel system - Air bleeding |
| Disconnected or loose spark plug wire - Inspect the spark plug wire connection, replace or repair |
| Defective spark plug - Replace spark plug |
| Fuel filter is clogged - Fuel filter needs changing |
| Defective safety switch - Replace if required |
| Carburetor malfunction - Check and repair as required |
| Low compression - Check and replace worn parts |
| Throttle cable is adjusted improperly or worn - Change cable or adjust properly |
| Air intake grill is clogged - Need to clean or wash |
| Ignition system problems - Inspect ignition system and change failed components |
| Defective or stuck choke cable - Change or clean the cable |
| Air filter is dirty - Replace or clean air filter |
| Fuel pump is damaged or dirty - Test fuel pump and change if necessary |
| Engine starts but then stops |
| Defective spark plug - Install new spark plug |
| Carburetor is clogged or defective - Service or change carburetor |
| Ignition coil is faulty - Change ignition coil as required |
| Valve springs are bad or broken - Change valve springs |
| Valves sticking - Valves must be cleaned |
| Not enough engine oil - Fill the crankcase with engine oil |
| Engine overloaded - Reduce engine load |
| Plugged cooling fins - Clean and wash as required |
| Carburetor mixture is too lean - Make the correct settings |
| Ignition timing is incorrect - Ignition timing needs to be set properly |
| Valve setting is improper - Adjust valves as required |
| Stale fuel - Use proper gasoline |
| Engine is under excessive load - Reduce load |
| Engine oil level is low - Check and refill engine oil |
| Low idle speed adjustment is incorrect - Correct the settings |
| Clogged or defective fuel pump - Service or change fuel pump |
| Crankshaft or main bearings failure - Need to install new components |
| Valve clearance is not correct - Need to adjust valve clearance |
| Damaged piston rings or cylinder bore - Change defective components |
| Dirty or incorrectly adjusted carburetor - Adjust the carburetor correctly or clean it |
| Air filter is blocked - Change or clean air filter |
| Fuel pump is damaged or dirty - Clean or change fuel pump |
| Ignition system malfunction - Inspect ignition system and change failed components |
| Worn cylinder head gasket - Replace cylinder head gasket |
| Valves are stuck or burned - Service or replace valves |
| Bent or worn push rod - Install a new push rod |
| Faulty cylinder block components - Replace defective parts as required |
| Engine uses too much fuel |
| Choke didn't open fully - Adjust or change choke cable |
| Incorrect carburetor main jet adjustment - Adjust it correctly |
| Loose or defective spark plug - Tighten or replace spark plug |
| Stuck, worn, or burned valves - Replace or service valves |
| Worn sleeve, rings, or piston - Replace faulty parts |
| Valve clearance is incorrect - Need to adjust valve clearance |
| Excessive oil consumption |
| Gaskets or seals may be damaged - Worn parts need to be replaced |
| Damaged valve stems or valve guides - Valves need to be changed |
| Damaged or seized piston rings - Install new piston rings |
| Worn cylinder liner or piston - Inspect piston and liner, fit new components as necessary |
| Breather hose or pipe is clogged - Service or replace |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission makes noise |
| Worn or unadjusted speed control linkage - Repair or adjust linkage |
| Transmission overload - Reduce transmission load |
| Dirty transmission fluid or insufficient fluid level - Add fluid to correct level or fill the transmission with fresh fluid |
| Worn or defective transmission components - Replace or repair defective components |
| Stuck or damaged gshift linkage - Replace or repair the linkage |
| Hydrostatic pump is worn or stuck - Repair or replace pump |
| Transmission shift control components are defective or misadjusted - Change or adjust correctly |
| Low fluid level - Fill the transmission housing to proper fluid level |
| Defective or worn drive sheave - Replace sheave |
| Unadjusted or broken shift linkage - Adjust correctly or change linkage |
| Speed control pedal linkage is bent or not adjusted - Change or adjust linkage |
| Transmission gaskets or seals are damaged - Install new seals or gaskets |
| Final drive shaft leaks - Change shaft seals |
| Transmission case is cracked - Change broken case |
| Mower Deck Troubleshooting |
| Mower vibration is excessive |
| Dirty or worn mower drive sheave - Service or change sheave |
| Loose or worn drive belt - Belt needs to be adjusted or replaced |
| Unbalanced or warped mower blades - Balance or change as needed |
| Blade bolts are not tightened well - Tighten bolts as required |
| Constant clogging of discharge chute |
| High mowing speed - Use a slower speed |
| Long grass - Must be set to low cutting height |
| Reduced engine rpm - Adjust throttle to full opening |
| Cutting height is too low - Use correct cutting height |
| Drive belt installed improperly - Install drive belt correctly |
| Lawn mower leaving uncut grass |
| Clogged mower deck - Clean out the mower deck |
| Blades are not sharp - Sharpen the blades |
| Defective or worn blades - Blades need to be replaced |
| Ground speed is too fast - Need to slow down |
| Mower deck set to low cutting - Use correct cutting height |
| Full grass bag - Remove grass from bag |
| Lawn is not level or bumpy - Lawn leveling required |
| Mower deck cutting height is set too low - Change cutting height adjustment |
| Fast ground speed - Use a slower speed |
| Deck level is not correct - Adjust the level of mower deck correctly |
| Blades are bent or worn - Replace the blades |
| Incorrect tire pressure - Inflate tires correctly |
| Incorrect tire pressure - Correct tire pressure |
| Deck is not leveled correctly - Adjust the level of mower deck correctly |
| Excessive blade dullness - Need to sharpen the blades |
| Worn or bent blades - Change the blades |
| Mower deck is clogged - Need to clean the mower deck |
| Deck shell is damaged - Rebuild or replace mower deck |
| Mower spindle is faulty or loose - Repair or replace the spindle |
| Electrical Troubleshooting |
| Battery will not charge |
| Electrical wire connections are loose or corroded - Clean or tighten connections |
| Defective electrical terminal connectors - Change terminal connectors |
| Battery is worn - Battery replacement required |
| Low battery output voltage - Low battery charging, charge as required |
| Battery drains quickly - Service charging system or install new battery |
| Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals |
| Battery is low or faulty - Replace or charge as required |
| Battery cables are disconnected or incorrectly connected - Check cables and connect as needed |
| Battery power is low - Battery is drained, charge it |
| Spark plug faulty or incorrectly gapped - Replace or clean and gap |
| Starter motor or solenoid failing - Repair starter or install a new solenoid |
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| Lawn and Garden Tractors Technical Specs |
