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Kubota B3150 Troubleshooting
The
Kubota B3150 is a 4WD compact utility tractor from B50 series. This model was
manufactured between 2014 and 2020. The Kubota B3150 driveline includes a 91.5
cu.in (2 L) Kubota V1505 vertical 4-cylinder indirect injection water-cooled
diesel engine and 3-range hydrostatic transmission with infinite forward and
reverse gears.
The engine has a cylinder bore of 3.09" (78 mm), piston stroke of 3.10"
(79 mm), and rated power of 28 hp (20.9 kW). Max. travel speed (forward
and reverse): 11.5 mph (18.5 km/h) / 9 mph (14.5 km/h).
The open center hydraulic system used a gear pump with fluid flow rate
of 8.7 gpm (33.1 lpm). The hydraulic system pressure is 161.8 bar (2347
psi). The Kubota B3150 is equipped with a hydrostatic power steering,
wet disc brakes, 7.00x12 or 24x8.50-12 front tires, and 12.4x16 or
13.6x16 rear tires. The wheel base is 65.6" (1666 mm). The tractor is
compatible with the following attachments: 54", 60" mid-mount 3-blade
mower decks with cutting height of 1.5-4.0 in (30-100 mm), and
Kubota
LA534EC loader with lift capacity to full height of 1146 lbs (519 kg).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| Fuel filter plugging - Change filter element |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Air in fuel pipes - Bleed fuel pipes |
| Clogged fuel injectors - Check fuel injectors and replace if required |
| Fuel injection pump is not working correctly - Install a new fuel pump or repair |
| Low compression - Check and change damaged parts |
| Engine shuts off unexpectedly during operation |
| Engine not warmed up - Warm up the engine |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Improper fuel injection - Fuel injection settings required |
| Fuel filter is clogged - Clean the filter or install new filter element |
| Fuel injectors are clogged or faulty - Service or change fuel injectors |
| Diesel starts but suddenly stops |
| Incorrectly set fuel injection pump timing - Check and correct adjustments |
| Fuel filter is clogged - Service or replace the filter |
| Clogged or damaged injector nozzles - Service or replace injector nozzles |
| Fuel injection pump malfunction - Repair or install new pump |
| Air cleaner is dirty - Service or replace the air cleaner |
| Engine stops at low idle speed |
| Low idle speed setting is not correct - Need to adjust idle speed |
| Defective fuel injection pump - Repair or change injection pump |
| Fuel injector nozzles are faulty - Install new set of properly balanced nozzles |
| Improper valve clearance - Correct valve clearance needs to be set |
| Insufficient coolant - Fill radiator to proper level. Check system for leaks |
| Cooling system components are failed or system is dirty - Change faulty components or flush the cooling system |
| Insufficient engine oil - Checking oil level and add if necessary |
| Broken fan belt or incorrect belt tension - Adjust belt tension properly or replace it |
| Thermostat failure - Replace the thermostat |
| Fuel injectors are defective or dirty - Service or change fuel injectors |
| Improper fuel injection pressure - Adjust to correct pressure |
| Dirty air filter element - Change or service air filter element |
| Clogged oil filter element - Replace or service engine oil filter |
| Engine is overloaded - Reduce load or shift to lower gear |
| Valve clearance is not correct - Adjustment procedure required |
| Incorrectly adjusted low idle speed - Correct low idle settings |
| Restricted fuel hoses or pipes - Clean fuel pipes and hoses |
| Engine lost compression: Leaking or broken valves - Have valves replaced |
| Abnormal engine noise or knocking |
| Fuel injection pump timing is incorrect - Check and correct settings |
| Damaged or clogged injector nozzles - Test injector nozzles and replace as required |
| Engine oil level is low - Checking oil level and add if necessary |
| Engine is cold - Warm up the engine as required |
| Worn main bearings or crankshaft - Install new parts |
| Piston rings failure - Replace the piston rings as required |
| Flywheel mounting screws are loose - Tighten the screws |
| Diesel engine consuming too much oil |
| External oil leaks: Damaged gaskets or seals - Replace worn parts to avoid leaks |
| Improper oil viscosity - Use correct viscosity oil |
| Piston rings are stuck or worn - Piston rings replacement required |
| Valve guides and stems are worn - Replace defective valves |
| Cylinder liners or pistons are worn - Inspect liners and pistons, replace as necessary |
| Electrical System Troubleshooting |
| Battery won’t charge |
| Battery is defective - Battery replacement required |
| Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
| Loose or corroded terminals and cables - Clean or tighten cables and terminals |
| Incorrect belt tension adjustment or worn belt - Change belt or properly adjust belt tension |
| Low battery voltage - Charge the battery |
| Battery is draining quickly - Service charging system or install new battery |
| Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
| Battery cables and terminals are loose or corroded - Clean or tighten cables and terminals |
| Low battery power - Battery is drained, recharge it |
| Drained or faulty battery - Recharge or change battery |
| Starter motor is faulty - Repair or install a new starter |
| Cables harness is improperly connected or disconnected - Inspect cables harness and reconnect it properly |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noises |
| Insufficient transmission fluid level or contaminated fluid - Add the fluid to proper level or pour fresh fluid |
| Worn or misadjusted speed control rod linkage - Replace rod linkage or adjust correctly |
| Relief valve sticking - Replace relief valve |
| Transmission overloaded - Reduce transmission load |
| Damaged or worn transmission parts - Change or repair damaged parts |
| Low transmission oil level - Fill the transmission housing to proper oil level |
| Transmission oil filter element is clogged - Change or service the transmission oil filter |
| Plugged or defective cooling components - Inspect all cooling components and service or change if necessary |
| Transmission is under excessive load - Reduce loading |
| Oil level is low - Fill up the transmission oil |
| Low charge pressure - Test charge pressure |
| Relief valve is worn or damaged - Replace relief valve as required |
| Broken gaskets or seals - Gaskets or seal replacement required |
| High pressure inside the transmission case - Inspect transmission components for wear or damage and replace if necessary |
| Plugged oil drain pipe - Service or change drain pipe |
| Hydraulics Troubleshooting |
| Hydraulic system overheating |
| Hydraulic system pressure is not set correctly - Set the hydraulic pressure as required |
| Misadjusted or defective main relief valve - Adjust or change relief valve |
| Dirty hydraulic oil - The oil must be changed |
| Air enters in hydraulic system - Check the pump seals, suction pipe, and fittings |
| Hydraulic fluid pressure is low |
| Lack of hydraulic oil - Fill the hydraulic system with oil |
| Hydraulic fluid filter element is dirty - Replace filter element or clean if required |
| Hydraulic pump not working - Check pump flow and install new pump if necessary |
| Hydraulic control valve block is defective or set improper - Change or set correctly |
| Faulty hydraulic cylinder - Check cylinder components for wear or damage and change if necessary |
| Hydraulic pipes are leaking - Identify leaks in the system and repair it |
| Three-point hitch lifting is too slow or cannot be lifted |
| Lack of hydraulic oil - Fill up the hydraulic oil |
| Cold hydraulic oil - Warm up the oil |
| Hydraulic fluid filter element clogging - Hydraulic filter maintenance required |
| Hydraulic pump not working - Test the pump flow rate and install new pump if required |
| Main relief valve malfunction or incorrect adjustment - Adjust or change relief valve |
| Hydraulic spool valve block is faulty or out of adjustment - Adjust correctly or replace |
| Hydraulic cylinder is defective - Inspect cylinder components for wear or damage and change if required |
| Damaged or disconnected suction pipe - Connect or replace |
| Three-point hitch dropping is too slow or cannot be dropped |
| Hydraulic control valve block is defective or set improper - Change or set correctly |
| Hydraulic cylinder is not working - Check cylinder components for wear or damage and change if necessary |
| Lift arm shaft is damaged - Install a new shaft |
| Internal mechanical failure of the hitch - Change defective or worn hitch parts |
| Hitch jerks when lower or lift |
| Air leaks in hydraulic system - Inspect the pump seals, suction line, and fittings |
| Contaminated hydraulic oil - Change hydraulic oil |
| Hydraulic pump failure - Flow-rate hydraulic pump and replace pump if necessary |
| Faulty or incorrect setting hydraulic control valve - Replace or set properly |
| Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required |
| Steering System Troubleshooting |
| Steering is difficult |
| Steering column is worn or improperly fitted - Refit properly or change the steering column |
| Aeration in steering system - Bleed air from system |
| Incorrect toe-in - Adjust toe-in wheels properly |
| Tire pressure is low - Tires need to be inflated |
| Steering pump malfunction - Install a new steering pump |
| Hydrostatic steering unit is worn or defective - Inspect and replace as required |
| Worn or stuck relief valve - Replace or service relief valve |
| Steering fluid insufficient - Check and refill steering fluid |
| Steering system oil leakage - Retighten joints of the hydraulic steering pipes and hoses |
| Excessive steering wheel play |
| Steering column coupling or shaft is worn - Replace faulty component |
| Hydrostatic steering unit has wear or damage - Repair or replace the steering unit |
| Faulty steering pump - Repair or replace steering pump |
| Worn or faulty steering tie-rod ends or linkage - Replace failed component |
| Front wheels wander to left or right |
| Improper tire pressure - Check the pressure and inflate tires as required |
| Incorrect toe-in adjustment - Check toe-in and correct |
| Steering tie-rod ends or linkage are worn - Change damaged component |
| Hydrostatic steering unit has wear or malfunction - Change or repair steering unit if required |
| Steering cylinder malfunction - Change or repair steering cylinder |
| Incorrectly adjusted or worn front hub bearings - Replace the bearings or adjust it properly |
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| Farm Tractors Technical Specifications |
