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Kubota T1400 Troubleshooting

The Kubota T1400 is a lawn tractor from T-series. This model was manufactured between 1987 and 1996. The components of Kubota T1400 powerline system: Kubota GH400 4-cycle single cylinder air-cooled OVH gasoline engine and belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 23.81 cubic inches (0.39 L) engine has a power rating of 13.5 hp (10.1 kW) and maximum torque of 25.5 Nm (18.9 lb-ft) at 2500 rpm. The maximum travel speed (forward/reverse): 5.6 mph (9 km/h) and 2.6 mph (4.2 km/h). The tractor is fitted with 14x5.00-6 front tires and 18x8.50-8 rear tires.

The wheelbase is 46.9 in (1190 mm). The Kubota T1400 can be equipped with the following attachments: a 40" mid-mount 2-blade Kubota RC40LT mower deck with cutting height of 1.0-4.0 in (25-101), 42" front-mount Kubota T2541 snowblower, and 44" front-mount Kubota T2083 blade.

Engine Troubleshooting
Engine won't start or starts hard
No fuel in fuel tank - Add gasoline
Improper fuel grade - Use correct fuel grade
Air in the fuel lines - Bleed the fuel lines
Spark plug wire is loose or disconnected - Check the spark plug wire connection, repair or replace
Spark plug is damaged - Spark plug need to be replaced
Plugged fuel filter - Fuel filter needs changing
Brake pedal not pushed down - Push the brake pedal down
Carburetor is not adjusted - Check carburetor float adjustment
Poor compression - Inspect and replace wear parts
Not adjusted or damaged throttle cable - Adjust correctly or change the cable
Engine runs irregularly
Cooling fins are clogged - Wash or clean as required
Ignition system problems - Test ignition and replace failed parts
Throttle cable is stuck or faulty - Clean or change the cable
Clogged air filter - Service or replace air filter
Fuel pump is damaged or dirty - Check fuel pump and change if required
Engine starts but then stops
Spark plug is damaged - Spark plug need to be replaced
Defective or dirty carburetor - Clean or change carburetor
Ignition coil is faulty - Ignition coil must be replaced
Bad or broken valve springs - New valve springs need to be installed
Valves sticking - Valves must be cleaned
Engine overheated
Not enough engine oil - Need to add engine oil
Excessive engine load - Reduce engine load
Air intake screen is plugged - Need to wash or clean
Carburetor mixture is too lean - Set the carburetor properly
Bad ignition timing - Ignition timing needs to be adjusted correctly
Wrong valve setting - Valves needs to be adjusted properly
Engine knocking or noise
Stale fuel - Use correct gasoline
Engine is running overloaded - Load reducing is recommended
Lack of engine oil - Fill up the oil to required level
Low idle speed setting is not correct - Correct idle settings
Fuel pump is faulty or clogged - Clean or replace fuel pump
Worn main bearings or crankshaft - Repair or replace defective parts
Excessive valve clearance - Adjust valve clearance according to specifications
Piston rings or cylinder bore are worn - Replace defective components
Engine power is insufficient
Dirty or incorrectly adjusted carburetor - Service or correctly adjust carburetor
Dirty air filter element - Replace or service air filter
Fuel pump is defective or dirty - Clean or install new fuel pump
Ignition failure - Inspect ignition system and change faulty parts
Damaged cylinder-head gasket - Cylinder-head gasket replacement required
Burned or stuck valves - Clean or replace valves
Worn or damaged push rod - Replace push rod
Worn cylinder block components - Change defective components
Engine using too much gasoline
Throttle does not open well - Inspect throttle cable and adjust it
Incorrect adjustment of carburetor main jet - Adjust it correctly
Defective or loose spark plug - Re-tighten or change the spark plug
Valves are worn, burned or stuck - Change or clean valves
Rings, sleeve, or piston are damaged - Replace faulty components as required
Incorrect valve clearance - Adjust valve clearance according to specifications
Excessive oil consumption
Damaged gaskets or seals - Replace worn parts to avoid leaks
Damaged valve guides or valve stems - Change the valves
Worn or stuck piston rings - Change the piston rings as required
Damaged cylinder liner or piston - Check liner and piston, replace as required
Clogged breather pipe or hose - Replace or clean

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission is excessively noisy
Worn or out of adjustment speed control linkage - Adjust or repair linkage
Transmission overloaded - Reduce loading
Contaminated transmission fluid or low fluid level - Fill to required level or change the fluid
Damaged or worn components of transmission - After disassembly and inspection, replace defective components
Hard shifting
Loose or broken shift linkage - Change defective linkage
Worn or seized hydrostatic pump - Repair or change pump
Misadjusted or faulty transmission shift control components - Change or adjust correctly
Power is too low
Lack of transmission oil supply - Need to add transmission oil
Drive pulley is worn or faulty - Change pulley
Broken or not adjusted shift linkage - Replace or adjust linkage
Speed control pedal linkage is damaged or out of adjustment - Adjust or install new linkage
Transmission leakage
Damaged transmission seals or gaskets - Change gaskets or seals
Final drive shaft leakage - Replace shaft seals
Transmission housing is cracked - Install a new transmission housing

Mower Deck Troubleshooting
Mower vibrates excessively
Clogged or damaged mower drive sheave - Clean or replace sheave
Drive belt is loose or defective - Adjust belt tension or change the belt
Unbalanced or warped mower blades - Balance or change as needed
Loose blade mounting bolts - Bolts should be tightened
Discharge chute is constantly plugged
Ground speed is too fast - Operate at slower speed
Grass is too high - Adjust mower to lower cutting height
Engine is running at too low speed - Choke is not fully opening
Mower deck set to low cutting - Must be set to high cutting height
Incorrect mower drive belt installation - Install drive belt as required
Lawn mower leaving uncut grass
Cutting deck clogging - Clean mower deck as required
Blades are excessively dull - Blades need to be sharpened
Defective or worn blades - Change the blades
Fast mowing speed - Use a lower speed
Cutting level is too low - Use correct cutting height
Grass bag is overfilled - Clean grass bag
Blade scalped grass
Lawn is bumpy or not smooth - Lawn needs to be leveled
Cutting level is too low - Adjust mower to higher cutting height
Fast mowing speed - Need to slow down
Mower deck is not leveled properly - Deck should be adjusted correctly
Blades are bent or worn - Blades must be changed
Tires are not correctly inflated - Inflate tires correctly
Mower cuts uneven
Tires are not correctly inflated - Check and inflate the tires
Deck level is not correct - Level the deck correctly
Blades are too dull - Need to sharpen the blades
Damaged or worn blades - Replace the blades
Cutting deck is clogged - Inspect and clean cutting deck
Damaged mower deck shell - Replace or rebuild mower deck
Loose or faulty mower spindle - Change or repair the spindle

Electrical Troubleshooting
Battery does not charge
Electrical cable connections are corroded or loose - Service or tighten cable connections
Battery terminal clamps are faulty - Install new terminal clamps
Battery is defective - Battery change required
Starter cranks slowly
Battery power is low - Battery needs to be recharged
Battery is draining quickly - Battery needs to be serviced or replaced
Disconnected cables or faulty battery terminals - Connect wiring correctly or install new terminals
Starter will not work
Battery is discharged or defective - Replace or charge as required
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly
Low battery output voltage - Battery is drained, recharge it
Spark plug faulty or incorrectly gapped - Replace or clean and gap
Solenoid or starter motor is faulty - Repair starter or install a new solenoid



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