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Kubota L1501 Troubleshooting
The
Kubota L1501 is a 2-wheel drive or 4-wheel drive sub-compact utility tractor.
This model was manufactured from 1975 to 1978. The tractor was designed in 2
versions: L1501F (2WD) and L1501DT (4WD).
The Kubota L1501 tractor is equipped with a 45.3 cubic inches (0.7L)
Kubota Z751 4-cycle 2-cylinder liquid cooled diesel engine. The engine
has a cylinder bore of 3.00" (76 mm), piston stroke of 3.22" (82 mm),
and rated power of 15 hp (11.2 kW). The mechanical transmission includes
a dry clutch and unsynchronized gearbox with 16 forward and 4 reverse
gears.
The maximum forward speed - 10 mph (16 kph), maximum reverse speed - 5
mph (8 kph). The open center hydraulic system used a gear pump with a
rated capacity of 4.8 gpm (18.3 lpm). The hydraulic pressure is 147 bar
(2130 psi). The Kubota L1501 is equipped with a manual steering system,
independent mechanical brakes, 4.00x12 front tires, and 8.30x22 rear
tires. The wheelbase is 54.8 (1380).
Engine Troubleshooting |
Engine won't start or starts hard |
Fuel filter is clogged - Service the filter |
No fuel supply from the tank - Open the fuel supply valve |
Air trapped in fuel system - Bleed air |
Fuel injectors are damaged or dirty - Check fuel injectors and replace if required |
Fuel injection pump malfunctioning - Rebuild or change fuel pump |
Poor engine compression - Inspect cylinder block and change defective components |
Engine stops running unexpectedly |
Low coolant temperature - Warm up engine as required |
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
Bad fuel injection - Check and adjust |
Plugged fuel filter - Change the filter element |
Fuel injectors are damaged or dirty - Service or change fuel injectors |
Diesel starts but suddenly stops |
Unadjusted fuel injection pump timing - Adjust injection timing |
Clogged fuel filter element - Clean or replace the filter |
Fuel injector nozzles fault - Change or clean injector nozzles |
Fuel injection pump is defective - Replace or rebuild injection pump |
Dirty air cleaner - Air cleaner maintenance required |
Engine stops while idling |
Incorrectly adjusted low idle speed - Normalize low idle speed |
Fuel injection pump damage - Rebuild or replace pump |
Fuel injector nozzles are damaged - Service or replace injector nozzles |
Valve out of adjustment - Correct valve clearance needs to be set |
Lack of coolant in cooling system - Coolant needs to be refilled. Any leaks must be repaired |
Cooling system is clogged or cooling components are defective - Service the cooling system or replace faulty components |
Engine oil level low - Fill up the oil to required level |
Incorrect fan belt tension or broken belt - Replace or adjust belt tension properly |
Thermostat is defective - Replace the thermostat |
Clogged fuel injectors - Test fuel injectors and change if necessary |
Incorrect fuel injection pressure - Correct the pressure settings |
Air filter element is dirty - Install new filter element or replace it |
Plugged engine oil filter - Replace or clean engine oil filter element |
Engine is overloaded - Shift to lower gear or reduce the load |
Improper valve clearance - Correct valve clearance |
Too low idle RPM - Adjust low idling as recommended |
Restricted fuel hoses or pipes - Fuel hoses and pipes must be clean |
Engine compression too low: Valves are faulty or leaking - Valve replacement required |
Incorrect setting of fuel injection pump timing - Check the fuel injection pump timing setting |
Fuel injector nozzles are damaged or dirty - Install a new set of well-balanced nozzles |
Engine oil level low - Fill up the engine oil |
Engine is cold - Warm up engine as required |
Crankshaft or main bearings wear - Need to install new components |
Stuck or worn piston rings - Piston rings need to be replaced |
Loose flywheel bolts - Inspect flywheel bolts and tighten properly |
Diesel engine consuming too much oil |
External oil leaks: Seals or gaskets are wearing excessively - Replace to repair leaks |
Improper oil viscosity - Fill up with the correct oil viscosity |
Worn or stuck piston rings - Change piston rings |
Worn valve guides and valve stems - Install new valves |
Cylinder liners or pistons are scuffed - Inspect liners and pistons, replace as necessary |
Electrical System Troubleshooting |
Battery cannot be charged |
Dead cell in battery - Install a new battery |
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair |
Battery cables and terminals are loose or corroded - Cables and terminals must be tightened or cleaned |
Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension correctly or change belt |
Low battery output voltage - Battery is drained, recharge it |
Battery is draining quickly - Battery needs to be serviced or replaced |
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace |
Loose or corroded terminals and cables - Terminals and cables need to be tightened or cleaned |
Low battery voltage - Battery needs to be recharged |
Discharged or defective battery - Recharge or replace battery |
Starter motor failing - Repair or change starter |
Disconnected or incorrectly connected cables - Need to reconnect cables correctly |
Transmission Troubleshooting |
Gear shift is hard |
Worn or misadjusted clutch - Adjust or install new clutch |
Gear shift linkage is damaged or loose - Repair or change shift linkage |
Bent or worn shift forks - Shift forks need to be replaced |
Faulty gear shifting mechanism - Faulty parts must be changed |
Transmission oil pressure is low |
Insufficient fluid supply - Check and refill the transmission fluid |
Plugged transmission fluid filter (if equipped) - Replace or clean transmission fluid filter |
Relief valve is faulty - Change relief valve |
Transmission is making noise |
Bearings are worn or broken - Replace faulty bearings |
Low transmission oil level - Add transmission oil as required |
Contaminated transmission oil - Change transmission oil |
Gears are defective or backlash is incorrect - Change worn gears or set backlash correctly |
Damaged or worn shift forks - Replace the shift forks |
Seals or gaskets are damaged - Install new seal or gaskets |
Transmission case is cracked - Replace case or transmission assembly |
Hydraulics Troubleshooting |
Hydraulic system overheated |
The system pressure has not been corrected - Make the correct settings |
Main relief valve incorrect adjustment or failure - Adjust the valve or replace if necessary |
Contaminated hydraulic fluid - Change hydraulic fluid |
Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals |
Low hydraulic oil pressure |
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required |
Hydraulic fluid filter clogging - Install a new hydraulic filter element |
Hydraulic pump not working - Test pump performance and replace pump if necessary |
Hydraulic spool valve is faulty or out of adjustment - Replace or adjust correctly |
Hydraulic cylinder is broken - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
Leakage in hydraulic pipes - Identify leaks in the system and repair it |
3-point hitch raises slowly or won't raise |
Not enough hydraulic fluid in the system - Add fluid to the hydraulic system |
Cold hydraulic fluid - Warm up the fluid |
Dirty hydraulic oil filter - Install a new hydraulic filter element |
Hydraulic pump malfunction - Check pump capacity and change if necessary |
Defective or misadjusted main relief valve - Adjust relief valve or change if required |
Defective or not adjusted hydraulic control valve - Adjust properly or change |
Hydraulic cylinder malfunction - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
Suction line is damaged or disconnected - Connect or replace |
Hitch can't drop or drops too slowly |
Faulty or incorrect setting hydraulic control valve - Set correctly or replace |
Hydraulic cylinder failure - Inspect the hydraulic cylinder parts for damage or wear and replace if required |
Hitch rock shaft is worn Replace the shaft |
Hitch has mechanical defects - Replace faulty or worn hitch components |
Hitch lower or lift is jerky |
Air trapped in the hydraulic system - Inspect the pump seals, suction pipe, and fittings |
Hydraulic oil is dirty - Hydraulic oil change required |
Hydraulic pump failure - Test the pump performance and change pump if required |
Faulty or incorrect setting hydraulic control valve - Set correctly or replace |
Hydraulic cylinder malfunction - Check cylinder components for damage or wear and change if necessary |
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 |