________________________________________________________________________________________
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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
