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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
