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Kubota M7171 Troubleshooting

The Kubota M7-171 is a four-wheel drive row-crop tractor from M7 Series. This model was manufactured from 2015 to 2018. The components of Kubota M7171 powerline system: a 374 cubic inches (6.1 L) Kubota V6108-CR 4-cylinder direct injection turbocharged liquid-cooled diesel engine with a rated power of 168 hp (125.3 kW), and 4-speed powershift transmission with 24 forward and 24 reverse gears. The maximum travel speed (forward/reverse): 24.9 mph (40 km/h) and 24.9 mph (40 km/h).

The open center hydraulic system includes a gear pump with rated fluid flow of 21 gal/min (79.5 l/min). The hydraulic pressure is 208 bar (3015 psi). The Kubota M7-171 is equipped with a hydrostatic power steering, hydraulic wet disc brakes, 14.9R28 front tyres, and 18.4R38 rear tyres. The tractor is compatible with Kubota LM2605 loader with a lift capacity of 5700 lbs (2585 kg).

Engine Troubleshooting
Engine won't start or starts hard
Plugged fuel filter - Change filter element
Fuel supply valve is closed - Open fuel supply valve
Air trapped in fuel system - Bleed air
Dirty or faulty injectors - Change fuel injectors
Fuel injection pump is faulty - Change or repair the pump
Engine has bad compression - Check and replace worn parts
Engine stalls during operation
Engine is not fully warmed up - Warm up the engine
Air in fuel system - Air-bleed fuel system
Fuel injection failed - Use correct settings
Fuel filter clogging - Replace filter element
Clogged fuel injectors - Clean or replace fuel injectors
Diesel starts and stalls suddenly
Fuel injection pump timing is incorrect - Check the fuel injection pump timing setting
Fuel filter clogging - Filter maintenance required
Damaged or clogged injector nozzles - Replace fuel injector nozzles
Fuel injection pump is defective - Repair or replace injection pump
Air cleaner element is clogged - Service or replace the air cleaner
Engine stalls at idle
Incorrect low idle setting - Normalize low idle speed
Fuel injection pump is faulty - Repair or replace injection pump
Damaged or clogged injector nozzles - Test injector nozzles and replace as required
Improper valve clearance - Adjust valve clearance according to specifications
Engine overheating
Insufficient coolant - Top up coolant. If there are leaks in the system, replace worn components
Cooling system parts are worn or system is clogged - Replace faulty parts or flush the cooling system
Low engine oil level - Check and refill engine oil
Incorrect fan belt tension or broken belt - Replace or adjust belt tension properly
Thermostat malfunction - Replace the thermostat
Engine lacks power
Fuel injectors are damaged or dirty - Test fuel injectors and change if necessary
Insufficient fuel injection pressure - Correct the pressure settings
Dirty air filter element - Replace or service air filter element
Plugged engine oil filter - Clean or replace engine oil filter element
Engine overloaded - Load reducing is recommended
Valve out of adjustment - Check and adjust
Low idle speed setting is not correct - Test and adjust
Dirt in the fuel pipes or hoses - Clean fuel pipes and hoses
Engine compression too low: Inlet or outlet valves are defective - Replace the valves as required
Engine noises or knocks
Incorrectly set fuel injection pump timing - Check and correct settings
Dirty or defective injector nozzles - Install a new set of well-balanced nozzles
Engine oil level is low - Add oil to the engine crankcase
Engine is cold - Warm up engine to required temperature
Main bearings or crankshaft are worn out - Need to install new components
Broken or worn piston rings - Replace the piston rings as required
Loose flywheel screws - Inspect the flywheel screws and tighten securely
Engine oil consumption is too high
External oil leaks: Damaged seals or gaskets - Replace worn parts to avoid leaks
Improper oil viscosity - Use oil of correct viscosity
Piston rings are seized or worn - Change piston rings
Valve guides or stems are damaged - Install new valves
Scored pistons or cylinder liners - Check pistons and liners, change as required

Electrical System Troubleshooting
Battery does not charge
Battery bad cell - Use a new battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose terminals and cables - Service or tighten battery cables and terminals
Belt is worn or belt tension is incorrectly adjusted - Install new belt or adjust belt tension as required
Starter motor turns slow
Low battery capacity - Low battery charging, charge as required
Battery will not hold charge - Battery needs service or replacement
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Battery cables and terminals are loose or corroded - Tighten or clean terminals and cables
Starter will not work
Battery capacity is low - Recharge the battery
Discharged or faulty battery - Replace or charge as required
Defective starter motor - Starter should be replaced
Incorrectly connected or disconnected wires - Check battery wires and connect correctly

Transmission Troubleshooting
Difficulty shifting gears
Worn or incorrectly adjusted clutch - Adjust clutch or replace if required
Damaged or loose gear shift linkage - Service or replace shift linkage
Worn or damaged shift forks - Replace defective shift forks
Worn gear shift mechanism - Replace worn components
Transmission oil pressure is low
Not enough oil in transmission - Add transmission oil as required
Transmission fluid filter is dirty (if equipped) - Change or service the transmission fluid filter
Faulty relief valve - Change the valve
Transmission is excessively noisy
Bearings are worn or broken - Bearings need to be replaced
Low transmission oil level - Checking transmission oil level and add if necessary
Transmission fluid contamination - Transmission fluid must be changed
Gears are defective or backlash is incorrect - Set backlash correctly or change the gears
Shift forks are worn or damaged - Shift forks need to be changed
Transmission fluid leaks
Broken gaskets or seals - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Excessive hydraulic system heat
The system pressure has not been corrected - Make the correct settings
Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary
Hydraulic fluid contamination - Change hydraulic fluid
Air enters in hydraulic system - Check the pump seals, suction line, and fittings
Hydraulic fluid pressure is low
Lack of hydraulic fluid - Add fluid to the hydraulic system
Dirty hydraulic oil filter - Service the hydraulic filter or change if required
Hydraulic pump is faulty - Check the pump capacity and replace pump if required
Hydraulic control valve block is faulty or out of adjustment - Adjust properly or change
Hydraulic cylinder is faulty - Check cylinder components for wear or damage and change if necessary
Hydraulic piping leaks - Detect leaks in hydraulic system and repair it
3-point hitch lifts too slowly or can't lift
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Cold hydraulic oil - Warm up the oil
Hydraulic oil filter element clogging - Change the hydraulic filter element or service if required
Defective hydraulic pump - Check the pump performance and replace it if required
Main relief valve failure or incorrect setting - Adjust or replace the relief valve
Faulty or incorrect setting hydraulic spool valve - Replace or adjust properly
Hydraulic cylinder is defective - Inspect cylinder components for wear or damage and change if required
Broken or disconnected suction line - Connect or replace
Hitch can't drop or drops too slowly
Hydraulic spool valve is defective or set improper - Replace or set properly
Hydraulic cylinder malfunction - Inspect the hydraulic cylinder components for damage or wear and change if required
Damaged hitch cross shaft - Install a new shaft
The hitch has mechanical faults - Replace worn or defective hitch components
Hitch lower or lift is jerky
Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Hydraulic pump is faulty - Check hydraulic pump flow and replace pump if necessary
Damaged or incorrect adjusted hydraulic spool valve - Replace or adjust correctly
Defective hydraulic cylinder - Inspect the hydraulic cylinder parts for damage or wear and replace if required



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