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Kubota L3600 Troubleshooting

The Kubota L3600 compact utility tractor was manufactured from 1994 to 1999. The Kubota L3600 tractor is powered by 113.3 cu.in (1.9 L) Kubota V1903-A 4-cycle vertical 4-cylinder indirect injection liquid cooled diesel engine with a rated power of 38.5 Hp (28.7 kW).

The Kubota L3600 is fitted with two transmission options: Sync Shuttle fully synchronized transmission with 8 forward and 8 reverse gears, or Glide Shift creeper transmission with 16 forward and 16 reverse gears. Max forward speed - 14.3 mph (23 km/h), maximum reverse speed - 13.1 mph (21.1 km/h).

The open center hydraulic system includes a gear pump with a rated capacity of 7.8 gpm (29.5 lpm). The hydraulic pressure is 175 bar (2490 psi). The Kubota L3600 was equipped with a hydrostatic power steering, wet disc brakes, 6.00x16 (2WD) or 8.3x16 (4WD) front tires, and 13.6x24 rear tires. The wheelbase is 71.3" (1810 mm) for 2-wheel drive models and 71.1" (1805 mm) for 4-wheel drive models.

Compatible attachments for the tractor: 72" mid-mount 3-blade Kubota RC72-36 mower deck with cutting height of 1.5-4.0" (37-102 mm), 72" front-mount Kubota L2072 blade with hydraulic lifting, 62" front-mount Kubota L62HD snow blower, Kubota BL4690 backhoe, and Kubota LA681 loader with lift capacity to full height of 1500 lbs (680 kg).

Engine Troubleshooting
Engine will not start or starts up hard
Dirty fuel filter element - Change the filter element
Closed fuel supply valve - Open supply valve to inject fuel
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Fuel injectors are defective or dirty - Service or change fuel injectors
Fuel injection pump failure - Install a new pump or rebuild
Low compression - Check cylinder block and replace damaged components
Engine stops unexpectedly while running
Engine is not preheated - Engine is not warmed up to the required temperature
Fuel lines leaking air - Tighten clamps, change faulty pipes
Uneven fuel injections - Repair or adjustment
Fuel filter is clogged - Change filter element
Fuel injectors are defective or dirty - Inspect fuel injectors and replace if necessary
Engine starts but immediately shuts off
Unadjusted fuel injection pump timing - Check and correct settings
Plugged fuel filter - Replace filter element
Dirty or defective injector nozzles - Test injector nozzles and replace as required
Fuel injection pump failure - Change pump or rebuild it
Air cleaner element is dirty - Air cleaner maintenance required
Engine stops while idling
Incorrectly adjusted low idle speed - Correct low idle adjustment
Fuel injection pump is defective - Repair or install new pump
Dirty or defective injector nozzles - Check and change nozzles as required
Excessive valve clearance - Correct valve clearance needs to be set
Engine is overheated
Engine has a lack of coolant - The cooling system needs to be refilled. Check for coolant leaks
Cooling system is dirty or cooling parts are failed - Flush cooling system or change faulty components
Engine oil level is low - Fill the crankcase with engine oil
Fan belt is defective or belt tension is not adjusted - Adjust properly or change the belt
Defective thermostat - Check and replace if required
Diesel engine is losing power
Dirty or faulty injectors - Change fuel injectors
Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary
Air filter is clogged - Replace filter or install new filter element
Engine oil filter is plugged - Replace or service engine oil filter
Engine overload - Change to lower gear or reduce load
Improper valve clearance - Need to adjust valve clearance
Low idle speed setting is incorrect - Adjust the low idle speed
Clogged fuel pipes or hoses - Clean fuel system hoses and pipes
Poor engine compression: Valves are damaged or leaking - Have valves replaced
Engine noises or knocks
Fuel injection pump timing is incorrect - Adjust injection timing
Clogged or damaged injector nozzles - Check and change nozzles as required
Engine oil level low - Check oil level and add oil as required
Coolant temperature is low - Warm up engine as required
Crankshaft or main bearings wear - Install new parts
Piston rings failure - Piston rings replacement required
Flywheel bolts are loose - Bolts need to be tightened
Engine using too much oil
External oil leaks: Damaged gaskets or seals - Change worn parts according to specifications
Crankcase oil too light - Fill up with the proper oil viscosity
Piston rings are defective or worn - Change piston rings
Valve stems or guides are damaged - Replace defective valves
Scored cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary

Electrical System Troubleshooting
Battery won’t charge
Worn-out battery - Replace the battery
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Corroded or loose terminals and cables - Cables and terminals must be tightened or cleaned
Damaged belt or incorrectly adjusted belt tension - Replace belt or properly adjust belt tension
Starter motor cranks slow
Low battery power - Recharge the battery
Battery is not holding charge - Service battery or change it
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose battery cables and terminals - Terminals and cables need to be tightened or cleaned
Starter does not work
Low battery output voltage - Battery is drained, recharge it
Discharged or faulty battery - Charge or change the battery
Starter motor failure - Starter should be changed
Improperly connected or disconnected cables - Check battery cables and connect properly

Transmission Troubleshooting
Hard to shift gears
Failure or improper clutch adjustment - Change or adjust clutch
Gear shift linkage is stuck or worn - Repair or change shift linkage
Bent or worn shift forks - Shift forks need to be changed
Gearshift mechanism failure - Change or repair failed components
Transmission fluid pressure is insufficient
Lack of transmission fluid supply - Add transmission fluid as required
Transmission oil filter element is dirty (if fitted) - Change or clean the transmission oil filter
Relief valve is defective - Install a new relief valve
Excessive transmission noise
Bearings are worn or broken - Change faulty bearings
Lack of transmission fluid supply - Check and refill the transmission fluid
Dirty transmission oil - Change transmission oil
Improper backlash or damaged gears - Replace gears or set backlash properly
Shift forks are damaged or worn - Change defective shift forks
Transmission oil leaking
Gaskets or seals are broken - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system overheating
Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly
Defective or misadjusted main relief valve - Adjust or replace the relief valve
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Aeration in hydraulic system - Check the suction pipe, fittings, and pump seals
Low hydraulic fluid pressure
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required
Hydraulic oil filter element clogging - Install a new hydraulic filter element
Hydraulic pump not working - Check pump performance and change it if necessary
Damaged or incorrect adjusted hydraulic control valve - Replace or adjust correctly
Defective hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required
Hydraulic lines are leaking - Detect leaks in hydraulic system and repair it
Hitch fails to lift or lifts slowly
Hydraulic oil level is insufficient - Add oil to the hydraulic system
Cold hydraulic oil - Warm up the oil
Dirty hydraulic oil filter - Change hydraulic filter element or clean if necessary
Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary
Unadjusted or defective main relief valve - Set up or change the relief valve
Defective or incorrect setting hydraulic spool valve block - Adjust correctly or replace
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Disconnected or damaged suction pipe - Connect or replace
Hitch can't drop or drops too slowly
Defective or not adjusted hydraulic spool valve - Adjust properly or replace
Hydraulic cylinder is not working - Check cylinder components for damage or wear and change if necessary
Damaged lift arm shaft - Install a new shaft
Mechanical parts of the hitch are damaged - Replace worn or damaged hitch components
Hitch is lowered or raised jerkily
Air in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic fluid contamination - Change hydraulic fluid
Hydraulic pump malfunction - Check hydraulic pump flow and replace pump if necessary
Faulty or incorrect setting hydraulic spool valve - Adjust properly or change
Hydraulic cylinder is broken - Inspect cylinder components for damage or wear and change if required

Steering System Troubleshooting
Steering is difficult
Worn or improperly mounted steering column - Mount the steering column properly or change it
Air in steering system - Need to bleed air
Not adjusted toe-in - Adjust toe-in properly
Tires are not correctly inflated - Inflate tires as necessary
Defective hydraulic steering pump - Check the hydraulic steering pump and change if necessary
Faulty or worn hydrostatic steering unit - Repair or replace the steering unit
Relief valve malfunction or sticking - Install a new relief valve or clean it
Insufficient steering oil - Need to add steering oil
Oil leaks in the steering system - Retighten steering line and hose connections
Excessive play in steering
Steering column shaft or coupling is worn out - Replace defective part
Worn or damaged hydrostatic steering unit - Change or repair steering unit if required
Worn steering pump - Replace or repair steering pump
Steering linkage or tie-rod ends are worn - Replace failed part
Tractor pulls to right or left
Front tires are worn out - Install new tires
Not adjusted toe-in - Adjust toe-in wheels properly
Steering tie-rod ends or linkage are defective - Change failed component
Faulty or worn hydrostatic steering unit - Replace or repair steering unit as required
Steering cylinder is defective - Change or repair hydraulic steering cylinder
Incorrectly adjusted or damaged front hub bearings - Adjust correctly or replace bearings



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