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Kubota B1400 Troubleshooting

The Kubota B1400 is a 2-wheel drive or 4-wheel drive sub-compact utility tractor from B00 series. This model was manufactured between 1979 and 1982. The Kubota B1400 is equipped with a 52.2 cubic inches Kubota D850L 4-cycle vertical 3-cylinder water-cooled diesel engine.

The engine has a cylinder bore of 2.86" (72 mm), piston stroke of 2.78" (70 mm), and rated power of 14 hp (10.4 kW). The selective sliding gear transmission consists of a dry single clutch and gearbox with 6 forward and 2 reverse speeds.

The maximum forward speed - 7.9 mph (12.6 km/h), maximum reverse speed - 4.4 mph (7.1 km/h). The open center hydraulic system used a gear pump with a rated capacity of 3.7 gpm (14 lpm). The Kubota B1400 tractor was equipped with 5.00x12 front tires and 8.00x16 rear tires. The wheelbase is 49.2" (1240 mm) for B1400 (2WD) models and 49.6" (1250 mm) for D1400DT (4WD) models.

Engine Troubleshooting
Engine doesn't start or starts hard
Clogged fuel filter element - Replace the filter element
No fuel injection - Open fuel cock to inject fuel
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Clogged or damaged injectors - Check fuel injectors and replace if required
Fuel injection pump is damaged - Replace or repair injection pump
Bad cylinder compression - Check cylinder block and replace defective parts
Engine stalls while running
Engine is not warmed up to the required temperature - Warm up the engine as required
Air in fuel pipes - Bleed fuel pipes
Irregular fuel injection - Adjust fuel injection timing
Dirty fuel filter element - Clean or replace the filter
Faulty or dirty injectors - Inspect fuel injectors and replace if necessary
Engine stops after starting
Timing of fuel injection pump is not adjusted - Repair or replace fuel injection pump
Fuel filter is clogged - Filter maintenance required
Fuel injector nozzles fault - Inspect injector nozzles and change if required
Defective fuel injection pump - Repair or replace injection pump
Air cleaner element is clogged - Replace or service air cleaner element
Engine shuts off while idling
Low idle speed setting is incorrect - Adjust the low idle speed
Fuel injection pump is defective - Change or repair the pump
Damaged or clogged injector nozzles - Install a new set of well-balanced nozzles
Valve out of adjustment - Correct valve clearance needs to be set
Engine overheats
Lack of coolant in cooling system - Fill cooling system to proper level. Inspect the system for leaks
Cooling system parts are damaged or system is dirty - Change faulty components or service cooling system
Engine oil level is insufficient - Need to add engine oil
Incorrect fan belt tension or broken belt - Adjust correctly or replace the belt
Thermostat fault - Replace the thermostat
Lack of engine power
Dirty or faulty injectors - Test fuel injectors and change if necessary
Fuel injection pressure is wrong - Adjust to correct pressure
Clogged air filter - Install new filter element or replace it
Oil filter element clogged - Clean or change engine oil filter
Engine is overloaded - Load reducing is recommended
Valve clearance is out of adjustment - Correct valve clearance needs to be set
Wrong adjustment of low idle speed - Adjust low idle speed
Fuel hoses or pipes clogging - Fuel pipes and hoses need to be cleaned
Lack of compression: Valves are damaged or leaking - Change the valves
Engine knocks or noises
Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected
Fuel injector nozzles are clogged or faulty - Change injector nozzles
Engine oil level low - Need to add engine oil
Engine is not warmed up to the required temperature - Warm up the engine as required
Crankshaft or main bearings wear - Have bearings or crankshaft replaced
Damaged or defective piston rings - Piston rings need to be replaced
Loose flywheel bolts - Inspect flywheel bolts and tighten properly
Excessive engine oil consumption
Oil leakage: Worn gaskets or seals - New components need to be installed
Incorrect oil viscosity - Use oil of correct viscosity
Worn or stuck piston rings - Piston rings need to be replaced
Damaged valve guides or valve stems - Valves must be replaced
Pistons or cylinder liners are scored - Check liners and pistons, install new components as required

Electrical System Troubleshooting
Battery will not charge
Battery is worn - Install a new battery
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Loose or corroded battery terminals and cables - Service or tighten battery cables and terminals
Belt damage or incorrect belt tension adjustment - Replace belt or adjust belt tension correctly
Starter turns slowly
Battery voltage is low - Recharge the battery
Battery drains quickly - Service charging system or change battery
Battery cable harness damage - Check battery cables for damage, change or repair
Corroded or loose battery cables and terminals - Tighten or clean terminals and cables
Starter motor is not working
Low battery voltage - Charge the battery
Discharged or faulty battery - Recharge or replace battery
Starter motor failing - Replace or repair starter
Disconnected or incorrectly connected cables - Need to reconnect cables correctly

Transmission Troubleshooting
Gears are hard to shift
Misadjusted or defective clutch - Adjust or replace the clutch
Stuck or damaged gear shift linkage - Repair or change shift linkage
Worn or damaged shift forks - Change defective shift forks
Worn gear shift mechanism - Replace worn components
Insufficient transmission oil pressure
Not enough fluid in transmission - Fill system with correct transmission fluid level
Dirty transmission oil filter (if fitted) - Replace or clean transmission oil filter
Relief valve is defective - Change relief valve
Transmission makes excessive noise
Damaged or worn bearings - Bearings replacement required
Fluid level is low - Fill up the transmission fluid
Dirty transmission oil - Change transmission oil
Gears are defective or backlash is incorrect - Replace gears or adjust backlash properly
Shift forks are damaged or worn - Shift forks need to be replaced
External fluid leaks
Gaskets or seals are defective Install new components
Transmission case is cracked - Replace case or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is too hot
Improper hydraulic system pressure setting - Set the pressure properly
Main relief valve incorrect adjustment or failure - Adjust the valve or replace if necessary
Dirty hydraulic fluid - The fluid must be changed
Hydraulic system sucks air - Inspect the suction pipe, fittings, and pump seals
Hydraulic fluid pressure is low
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required
Hydraulic fluid filter is clogged - Clean the hydraulic filter or install new filter element
Hydraulic pump is defective - Flow-rate hydraulic pump and replace pump if necessary
Hydraulic spool valve block is faulty or out of adjustment - Adjust properly or replace
Hydraulic cylinder failure - Check cylinder components for damage or wear and change if necessary
Hydraulic lines are leaking - Find leaks in hydraulic system and repair it
3-point hitch lifts slowly or won't lift
Hydraulic fluid level is insufficient - Need to add fluid
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter clogging - Service or replace the hydraulic filter
Hydraulic pump is defective - Flow-rate pump and change pump if necessary
Main relief valve is defective or unadjusted - Adjust or replace the relief valve
Hydraulic control valve is defective or set improper - Adjust correctly or change
Hydraulic cylinder failure - Check cylinder components for damage or wear and change if necessary
Damaged or loose hydraulic suction line - Tighten or change it
Hitch won't lower or lowers slowly
Hydraulic control valve is defective or set improper - Adjust properly or change
Hydraulic cylinder is defective - Check cylinder components for damage or wear and change if necessary
Hitch cross shaft is worn - Change the shaft
The hitch has any internal mechanical damage - Replace defective or worn hitch parts
Hitch lower or lift is jerky
Air enters in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Hydraulic fluid is dirty - Hydraulic fluid change required
Hydraulic pump malfunction - Check pump flow and install new pump if necessary
Hydraulic spool valve is faulty or out of adjustment - Change or set correctly
Hydraulic cylinder failure - Inspect the hydraulic cylinder parts for damage or wear and replace if required

Steering System Troubleshooting
Hard Steering
Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts
Steering gearbox components are worn - Replace defective components of steering gearbox
Faulty drag link or tie rod - Replace or repair
Insufficient lubrication in steering box - Need to lubricate the gearbox
Not adjusted toe-in alignment - Check and adjust toe-in
Tires are not correctly inflated - Inflate tires as necessary
Excessive steering wheel free play
Steering column bearing or shaft is worn - Change faulty parts
Steering linkage assembly is worn or loose - Repair or replace steering linkage
Worn steering gearbox bearings - Replace the bearings
Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles
Damaged or worn steering tie-rod ends - Change faulty part
Tractor pulls to right or left
Worn or loose steering linkage assembly - Repair or replace steering linkage
Defective steering knuckle bushing - Replace knuckle bushing
Uneven tire pressure - Inflate the tires properly
Toe-in adjustment is incorrect - Adjust toe-in correctly



Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294