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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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| Lawn and Garden Tractors Technical Specs |
