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