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Kubota M7151 Troubleshooting

The 4-wheel drive Kubota M7-151 row-crop tractor was manufactured between 2015 and 2022. The Kubota M7-151 tractor is equipped with a 180 cu.in (3 L) Kubota V6108-CR 4-stroke 4-cylinder direct injection turbocharged liquid-cooled diesel engine. The engine has a cylinder bore of 4.65" (118 mm), piston stroke of 5.51" (140 mm), and rated power of 148 hp (110.4 kW). The powershift transmission consists of electro-hydraulic wet clutch and gearbox with 24 forward and 24 reverse gears. The maximum forward speed - 24.9 mph (40 kph), maximum reverse speed - 24.9 mph (40 kph).

The open center hydraulic system has a gear pump with a rated capacity of 21 gal/min (79.5 l/min). The hydraulic system pressure is 208 bar (3015 psi). The tractor is equipped with a hydrostatic power steering system, hydraulic wet disc brakes, 14.9R28 front tyres, and 18.4R38 rear tyres. The Kubota M7-151 can be equipped with the following attachments: Kubota LM2605 front-end loader with a lift capacity to full height of 5700 lbs (2585 kg).

Engine Troubleshooting
Engine won't start or hard to start
Fuel filter is dirty - Service or replace the filter
No fuel injection - Open fuel cock to inject fuel
Fuel lines leaking air - Tighten clamps, change faulty pipes
Dirty or faulty injectors - Clean or replace fuel injectors
Fuel injection pump is not operating properly - Replacement or repair required
Poor engine compression - Inspect cylinder block and replace worn components
Engine stops during operation
Coolant temperature is low - Warm up engine to required temperature
Air trapped in fuel system - Bleed air
Uneven fuel injections - Repair or adjustment
Plugged fuel filter - Filter maintenance required
Dirty or faulty injectors - Clean or replace fuel injectors
Diesel starts and stalls suddenly
Timing of fuel injection pump is not adjusted - Fuel injection pump timing adjustment needs to be corrected
Fuel filter is dirty - Clean the filter element
Clogged or defective injector nozzles - Install a new set of well-balanced nozzles
Faulty fuel injection pump - Repair or change injection pump
Air cleaner element is dirty - Change or service air cleaner element
Engine stops when idle
Wrong adjustment of low idle speed - Correct low idle adjustment
Defective fuel injection pump - Rebuild or install a new injection pump
Clogged or defective injector nozzles - Change injector nozzles
Valve clearance is wrong - Adjust valve clearance
Engine overheating
Not enough coolant - Top up coolant fluid. Check the components of cooling system
Cooling system components are failed or system is clogged - Service the cooling system or change faulty parts
Low engine oil level - Fill the crankcase with engine oil
Incorrect fan belt tension or broken belt - Change or adjust belt tension correctly
Defective or wrong type of thermostat - Install new thermostat
Engine power loss
Fuel injectors are defective or dirty - Change fuel injectors
Fuel injection pressure is wrong - Repair or replace injection pump
Air filter is dirty - Install new filter element or replace it
Oil filter element clogging - Replace or clean engine oil filter element
Engine is under excessive load - Reduce the load or use a lower gear
Incorrect valve clearance - Check and adjust as required
Low idle speed setting is incorrect - Adjust low idling as recommended
Fuel pipes or hoses clogging - Service fuel hoses and pipes
Lack of compression: Valves are damaged or leaking - Valve replacement required
Engine knocking or noise
Unadjusted fuel injection pump timing - Check and correct settings
Clogged or damaged injector nozzles - Service or replace nozzles if required
Engine oil level low - Checking oil level and add if necessary
Engine is not fully warmed up - Warm up engine to required temperature
Worn crankshaft or main bearings - Install new parts
Damaged or defective piston rings - Replace piston rings
Loose flywheel screws - Check the flywheel screws and tighten as required
Diesel engine consuming too much oil
Oil leakage: Defective seals or gaskets - Install new components
Improper oil viscosity - Fill up with the proper oil viscosity
Stuck or worn piston rings - Have piston rings replaced
Worn valve stems and valve guides - Valves must be replaced
Pistons or cylinder liners are scuffed - Inspect liners and pistons, change as necessary

Electrical System Troubleshooting
Battery won’t charge
Worn-out battery - Change the battery
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Corroded or loose terminals and cables - Terminals and cables need to be tightened or cleaned
Damaged belt or incorrectly adjusted belt tension - Replace belt or properly adjust belt tension
Starter turns slow
Low battery output voltage - Battery is drained, recharge it
Battery discharges quickly - Service battery or change it
Damaged battery electrical wire harness - Inspect electrical wires for damage, change or repair
Loose or corroded battery terminals and cables - Terminals and cables need to be tightened or cleaned
Starter motor is not working
Low battery power - Battery is drained, recharge it
Drained or defective battery - Charge or replace the battery
Faulty starter motor - Starter should be replaced
Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly

Transmission Troubleshooting
Gears are hard to shift
Clutch is not adjusted or faulty - Clutch adjustment or replacement required
Gear shift linkage is damaged or loose - Change defective shift linkage
Shift forks are damaged or worn - Shift forks need to be replaced
Faulty parts in the gear shifting mechanism - Change faulty parts
Lack of transmission oil pressure
Oil level is insufficient - Fill up the transmission oil
Clogged transmission fluid filter element (if fitted) - Change or clean the transmission fluid filter
Faulty relief valve - Replace relief valve as required
Transmission is making noise
Broken or worn bearings - Replace the bearings
Insufficient oil supply - Checking transmission oil level and add if necessary
Dirty transmission fluid - Change transmission fluid
Backlash is incorrect or gears are worn - Set backlash properly or change the gears
Shift forks are worn or damaged - Replace the shift forks
Transmission fluid leakage
Gaskets or seals are defective Seals and gaskets need to be replaced
Cracked transmission case - Install a new transmission case

Hydraulics Troubleshooting
Excessive hydraulic system heat
Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly
Main relief valve failure or incorrect setting - Set up or change the relief valve
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Air enters in hydraulic system - Inspect the suction line, pump seals, and fittings
Insufficient hydraulic fluid pressure
Lack of hydraulic fluid - Add fluid to the hydraulic system
Hydraulic fluid filter element clogging - Clean or change hydraulic filter
Faulty hydraulic oil pump - Test the pump flow rate and install new pump if required
Hydraulic spool valve block is not set properly or defective - Replace or set correctly
Defective hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Leakage in hydraulic lines - Find leaks in the system and fix it
Hitch cannot be raised or raising is too slowly
Lack of hydraulic oil - Check oil level and add hydraulic oil as required
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter element is dirty - Replace hydraulic filter element or service if necessary
Damaged hydraulic oil pump - Test the pump performance and change pump if required
Faulty or incorrectly adjusted main relief valve - Adjust the valve or replace if necessary
Defective or incorrect setting hydraulic control valve block - Adjust properly or change
Hydraulic cylinder is not working - Check the hydraulic cylinder components for damage or wear and change if necessary
Broken or disconnected suction line - Connect or replace
Hitch won't lower or lowers slowly
Hydraulic control valve block is not set properly or defective - Replace or set properly
Hydraulic cylinder failure - Check the hydraulic cylinder components for damage or wear and change if necessary
Worn hitch rock shaft - Change the shaft
Internal mechanical failure of the hitch - Change faulty or worn hitch parts
Hitch jerks when lift or lower
Air enters in hydraulic system - Check the pump seals, suction line, and fittings
Hydraulic fluid is dirty - Hydraulic fluid change required
Hydraulic pump not working - Check pump capacity and change if necessary
Defective or not adjusted hydraulic spool valve - Set correctly or replace
Hydraulic cylinder is faulty - Check cylinder parts for wear or damage and replace if necessary



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