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John Deere 112 Troubleshooting

The John Deere 112 is a garden tractor from 100-series. This model was manufactured between 1966 and 1974.

The JD 112 driveline consists of a 4x1 Peerless 2300 gear transmission with variable pulley drive and one of three engine models: a 23.7 cu.in (388 cc) Tecumseh HH100 1-cylinder horizontal-shaft air-cooled gasoline engine with a max power of 10 hp (7.5 kW), a 23.9 cu.in (391 cc) Kohler K241S 1-cylinder air-cooled gasoline engine with a max power of 10 hp (7.5 kW), or 29.1 cu.in (476 cc) Kohler K301S 1-cylinder air-cooled gasoline engine with a rated power of 12 hp (9 kW).

Max. forward speed - 7.1 mph (11.4 km/h), maximum reverse speed - 3.1 mph (5 km/h). The tractor was equipped with 16x6.50-8 front tires and 8.00x12 rear tires. The wheelbase is 44 in (1110 mm). Compatible attachments for the John Deere 112 garden tractor: 38", 46" mid-mount 3-blade right-discharge mower decks with cutting height of 1-4" (25-101 mm), 42" front-mount blade, 42" center-mount blade with manual lifting system, 36" front-mount snow blower.

Engine Troubleshooting
Engine hard to start or will not start
Gas tank is empty - Fill fuel up
Low-quality gasoline - Change fuel
Dirt and debris in fuel system - Remove debris and dirt
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change
Spark plug is defective - Spark plug need to be replaced
Fuel filter is dirty - Fuel filter needs changing
Safety contact for brake pedal defective - Install new part
Carburetor malfunction - Check and repair as required
Poor cylinder compression - Check cylinder block and change worn parts
Unadjusted or worn throttle cable - Replace cable or adjust properly
Rough engine running
Air intake screen is plugged - Need to clean or wash
Defective ignition - Check ignition system and replace faulty parts
Throttle cable is defective or stuck - Replace or clean the cable
Air filter is dirty - Change or clean air filter
Clogged or damaged fuel pump - Check fuel pump and change if required
Engine stalls after starting
Defective spark plug - Install new spark plug
Carburetor is dirty or faulty - Service or change carburetor
Defective ignition coil - Install a new ignition coil
Bad or broken valve springs - Valve springs need to be changed
Valves are stuck - Valves must be cleaned
Engine overheats
Engine oil level is low - Fill up the engine oil
Engine is under excessive load - Reduce the load
Air intake grill is clogged - Wash or clean as required
Carburetor mixture is too lean - Use proper settings
Incorrect ignition timing - Set the ignition timing correctly
Valve setting is incorrect - Set the valves properly
Engine knocks or noises
Stale gasoline - Change fuel
Engine is running overloaded - Load reducing is recommended
Engine oil insufficient - Check and refill engine oil
Low idle speed adjustment is incorrect - Adjust idling as required
Fuel pump is dirty or defective - Inspect fuel pump and change as required
Crankshaft or main bearings wear - Need to install new components
Valve clearance is incorrect - Check and adjust
Worn piston rings or cylinder bore - Change faulty parts
Engine lacks power
Incorrectly adjusted or clogged carburetor - Adjust the carburetor properly or clean it
Air filter is blocked - Service or change air filter
Dirty or damaged fuel pump - Clean or change fuel pump
Defective ignition - Inspect ignition system and change faulty parts
Defective cylinder head gasket - Replace the head gasket
Valves are stuck or burned - Clean or change valves
Bent or worn push rod - Install a new push rod
Cylinder block components are worn - Change defective parts
Engine using too much gasoline
Choke opening is not full - Replace or adjust choke cable
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet properly
Faulty or loose spark plug - Tighten or replace spark plug
Valves are stuck, burned, or worn - Clean or replace valves
Worn piston, rings, or sleeve - Replace defective parts
Incorrect valve clearance - Adjustment procedure required
Engine oil consumption is too high
Worn seals or gaskets - New components need to be installed
Valve guides or stems are damaged - Valves need to be changed
Piston rings are defective or worn - Change piston rings
Scored cylinder liner or piston - Inspect piston and liner, replace as required
Breather hose or pipe is clogged - Clean or change

Transmission Troubleshooting
Gears are hard to shift
Gear shift linkage is rusty or worn - Lubricate or replace the shift linkage
Damaged or worn shift forks - Install new shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Transmission makes noise
Insufficient transmission oil - Checking transmission oil level and add if necessary
Transmission fluid is dirty - Transmission fluid change required
Worn bearings or damaged gears - Install new bearings or gears
Transmission pops out of gear
Gear shift lever is bent or installed improperly - Replace or install shift lever correctly
Gear teeth are worn or damaged - Install new gears
Shift rods or shift forks are faulty - Replace damaged rods or forks
Transmission slips
Defective drive shaft/belt or incorrect drive shaft/belt adjustment - Replace belt/shaft or adjust it
Improper clutch/brake adjustment or faulty clutch/brake - Adjust or change brake/clutch
Worn or faulty drive pulley - Replace pulley

Mower Deck Troubleshooting
Excessive mower vibration
Worn or dirty mower drive pulley - Replace or service pulley
Worn or loose drive belt - Replace belt or adjust belt tension
Mower blades are not balanced or warped - Change or balance blades
Blade mounting bolts are loose - Tighten it fast
Discharge chute is regularly plugged
Fast mowing speed - Need to slow down
Tall grass - Need to set low cutting height
Engine runs at low revs - Throttle is not fully open
Cutting level is too low - Must be set to high cutting height
Drive belt installed improperly - Drive belt must be installed correctly
Uncut grass when mowing
Cutting deck clogging - Mower deck needs to be cleaned
Blades are not sharp - Need a blade sharpening
Damaged or worn blades - Blades must be changed
High ground speed - Need to slow down
Low cutting height - Use correct cutting height
Grass bag is overfilled - Clean grass bag
Blades scalp the grass
Bumpy or unleveled lawn - Roll or level the lawn
Mower deck set to low cutting - Raise the cutting height
Fast mowing speed - Operate at slower speed
Mower deck is not leveled properly - Level the deck correctly
Worn or bent blades - Blades need to be replaced
Tires are not correctly inflated - Need to inflate tires
Uneven cut
Low tire pressure - Inflate tires correctly
Incorrect level of mower deck - Adjust mower deck level properly
Blades are not sharp - Need to sharpen the blades
Damaged or worn blades - Blades need to be replaced
Deck is plugged with grass - Inspect and clean cutting deck
Broken mower deck shell - Repair or change the deck
Mower spindle is loose or defective - Repair or change the spindle

Electrical Troubleshooting
Battery is not charging
Corroded or loose electrical wire connections - Tighten or clean electrical wiring connections
Defective battery terminal clamps - Install new terminal clamps
Battery failing - Battery change required
Starter turns slowly
Battery power is low - Charge the battery
Battery is draining quickly - Service or replace the battery
Faulty battery terminals or disconnected cables - Check battery wires and service or replace terminals
Starter will not work
Battery is discharged or defective - Change or recharge battery
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required
Battery voltage is low - Recharge the battery
Improperly gapped or dirty spark plug - Clean, gap or change spark plug
Starter motor or solenoid is defective - Repair starter or replace solenoid




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