Kubota M6-142 service schedule

Kubota M6 series · c. 2016–2019 (M6001 series; the later M6142 Stage V from c. 2020 is not covered; see watch)

Every maker's service job for the Kubota M6-142, counted in hours, with the oils, filters and parts each one needs. Add your tractor to Farmyard Workshop and it works out what's due from your hours and dates, and keeps the service history.

Track your M6-142 for free

Service intervals

Job	When
Cab fresh air and inner air filters: clean	every 200 hours
Water separator element and fuel pump strainer	every 400 hours
Engine oil and filter change	every 500 hours or every year
Fuel filter: replace; pre-fuel filter: clean	every 500 hours
Hydraulic oil filter and magnetic filter	every 500 hours
Engine air filter elements (outer and inner): replace	every 1,000 hours or every year
Transmission and hydraulic oil change with filters and suction strainers	every 1,000 hours
Front differential and axle gear case oil change	every 1,000 hours
Engine valve clearance: dealer check	every 1,000 hours
Crankcase oil separator element	every 1,500 hours
Coolant flush and change	every 2,000 hours or every 2 years
AdBlue (DEF) pump filter	every 3,000 hours
DPF ash cleaning and DEF tank suction filter: dealer service	every 8,000 hours

Service jobs and parts

Cab fresh air and inner air filters: clean

Cab · every 200 hours

Kubota says clean the cab inner and fresh air filters every 200 hours, and more often in dust. A deformed filter lets dust into the air-conditioning.

Part	Qty	Notes	Part number
Cab air filter	2	Listed as quantity 2 in the M6-142 catalogue. Which slot each one fits: check your handbook	6A671-75090
Cab filter	1	Listed as 'Kabinenfilter' in the M6-142 catalogue	T1855-71600
Activated carbon filter (where fitted)	1	Not found: check your handbook	check your handbook

Step-by-step

Apply the handbrake, stop the engine and take the key out. Use a stable ladder, never stand on a tyre or mudguard.
Undo the knob bolts and pull the filters out.
Wear a dust mask. Blow air through against the normal airflow at under 205 kPa. Do not tap or bang the filter.
If very dirty, soak it in lukewarm water with mild washing-up liquid, rinse and let it air-dry. Never use petrol or chemicals.
Refit the filters and check they seal. Replace any that are damaged.

Tools: Strong step ladder, Dust mask, Compressed air (under 205 kPa), Mild washing-up liquid

Water separator element and fuel pump strainer

Fuel · every 400 hours

On the 6.1 L tractors Kubota says replace the water separator element and clean the fuel solenoid pump element every 400 hours. Drain water whenever the water warning shows.

Part	Qty	Notes	Part number
Water separator element	1	With O-ring; from the M6-142 parts catalogue	1G311-43380
Fuel pump filter element	1	Kubota says clean it in kerosene and replace it if damaged. Number not confirmed: check your handbook	check your handbook

Step-by-step

Stop the engine, take the key out and work in a clean place.
Close the fuel shut-off valve and unplug the water sensor connector.
Unscrew the cup, fit the new element and O-ring, and rinse the inside of the cup with kerosene.
Refit the cup and plug the sensor back in.
Remove the fuel solenoid pump cover, take out the magnet and element, clean them in kerosene and refit, keeping dirt out.
Open the fuel valve, bleed the fuel system and check for leaks.

Tools: Container for fuel, Kerosene, Rags, Gloves

Engine oil and filter change

Engine · every 500 hours or every year

Kubota says change the engine oil every 500 hours or every year, whichever comes first, and replace the oil filter every 500 hours. They are done together. Kubota warns to use only a genuine Kubota filter.

Part	Qty	Notes	Part number
Engine oil	1	10W-30 or 15W-40. API CJ-4, ≈14.6 L with filter. Aztec Oils match: EMPROTEC UHPD-X 10W-30 FE	check your handbook
Engine oil filter cartridge	1	From the M6-142 parts catalogue	HH1G0-32430

Step-by-step

Park on level ground, lower the linkage, loader and any implement, stop the engine, take the key out and chock the wheels.
Let the engine cool enough to work safely. Hot oil burns, so wear gloves.
Remove the drain plug at the bottom of the engine and let the oil drain fully, then refit the plug.
Remove the old filter. Wipe the filter head and put a film of clean engine oil on the new filter's rubber seal.
Screw the new filter on until the seal touches, then turn it a further half turn by hand only.
Fill with new oil to the upper notch on the dipstick.
Run the engine for a few minutes, check the filter seal for leaks, stop it, recheck the dipstick and top up. The level usually drops a little after a new filter.

Tools: Drain tray (20 L), Spanner for sump plug, Filter wrench, Funnel, Rags, Gloves

Fuel filter: replace; pre-fuel filter: clean

Fuel · every 500 hours

Kubota says replace the fuel filter and clean the pre-fuel filter every 500 hours. Dirty fuel damages the supply pump and injectors early on a common-rail engine.

Part	Qty	Notes	Part number
Fuel filter cartridge	1	From the M6-142 parts catalogue (fuel filter section)	HH1J0-43172
Fuel filter (second filter)	1	Listed as a frequently used part in the M6-142 catalogue. Which housing it fits is not clear: check your handbook	1G410-52300

Step-by-step

Stop the engine, take the key out and chock the wheels. Keep naked flames away. Do this in a clean place, not in the field.
Close the fuel shut-off valve and clean around the filters.
Pre-fuel filter: remove the retainer ring and cup, rinse the cup and element in kerosene and refit.
Fuel filter: remove the old cartridge, wet the new seal with clean fuel, and screw it on until the seal touches, then tighten by hand as shown on the filter.
Open the fuel valve and bleed the fuel system as the handbook shows. Never crack open the high-pressure pipes on a common-rail engine.
Start the engine and check for leaks.

Tools: Container for fuel, Filter wrench, Kerosene and a clean tray, Rags, Gloves

Hydraulic oil filter and magnetic filter

Hydraulics · every 500 hours

Kubota says replace the hydraulic oil filter every 500 hours. That is more often than the 1,000-hour transmission fluid change, so it is a filter-only task. The handbook has you drain the transmission case to reach it and clean the magnetic filter at the same time. Use only a genuine Kubota filter.

Part	Qty	Notes	Part number
Hydraulic oil filter cartridge	1	Listed in the M6-142 catalogue's frequently used parts as a cartridge filter, but labels conflict (see notes). Confirm with your dealer	3U503-82590
Kubota SUPER UDT2	1	To refill to the upper notch on the dipstick (≈65 L if fully drained)	check your handbook

Step-by-step

Park on level ground, lower the linkage, loader and implements, stop the engine, take the key out and chock the wheels.
Let the oil cool enough to work safely; hot oil burns.
Remove the transmission case drain plug, drain the oil into a tray and refit the plug.
Undo the 3 bolts, remove the cover and take out the old filter.
Wipe any metal filings off the magnetic filter with a clean rag.
Oil the new filter's rubber seal with clean transmission oil, screw it on until it touches, then turn a further half turn by hand.
Refit the cover and fill with SUPER UDT2 to the upper notch on the dipstick.
Run the engine for a few minutes, stop it, check the filter for leaks and top up.

Tools: Large drain tray (70 L), Spanners, Filter wrench, Pump or funnel, Clean rags, Gloves

Engine air filter elements (outer and inner): replace

Engine · every 1,000 hours or every year

Kubota says replace both air cleaner elements every 1,000 hours or every year, whichever comes first. Clean the outer element every 100 hours, and more often in dust.

Part	Qty	Notes	Part number
Air cleaner outer element	1	From the M6-142 parts catalogue	3U503-11210
Air cleaner inner element	1	From the M6-142 parts catalogue	3U503-11220

Step-by-step

Stop the engine and take the key out. Never run the engine with the filter out.
Remove the air cleaner cover and take out the outer element, then the inner element.
Wipe the housing out with a damp cloth. Do not blow dirt down the intake.
Fit the new elements, check they seat evenly and refit the cover.
Between changes, clean the outer element by blowing air from the inside out at under 205 kPa (30 psi).

Tools: Damp cloth, Torch

Transmission and hydraulic oil change with filters and suction strainers

Transmission · every 1,000 hours

Kubota says change the transmission fluid every 1,000 hours. Kubota's 1,000 h kit for the M6-122/132/142 (W21TK00272) includes the hydraulic filter, two suction filters and a transmission filter, so they are all changed with the oil.

Part	Qty	Notes	Part number
Kubota SUPER UDT2	1	≈65 L	check your handbook
Hydraulic oil filter cartridge	1	See the hydraulic filter task	3U503-82590
Suction filters	2	Listed as suction filters, quantity 2, in the M6-142 catalogue. Confirm with your dealer	3U503-82570
Transmission filter element	1	Included in the 1,000 h kit; number not confirmed: check your handbook	check your handbook
Genuine 1,000 h service kit	1	Alternative to buying parts singly; kit contents not itemised by retailers	W21TK00272

Step-by-step

Park on level ground, lower the linkage, loader and implements, stop the engine, take the key out and chock the wheels.
Let the oil cool enough to work safely; hot oil burns.
Remove the drain plug at the bottom of the transmission case and drain fully. Clean the magnetic drain plug.
Replace the hydraulic filter, the suction filters and the transmission filter as the handbook shows, with oiled seals.
Refit the plug and fill with SUPER UDT2 to the upper notch on the dipstick.
Do not work the tractor straight away. Run the engine at medium speed for a few minutes, stop it, recheck the level and top up.

Tools: Large drain tray (70 L), Spanners, Filter wrench, Pump or funnel, Clean rags, Gloves

Front differential and axle gear case oil change

Front axle · every 1,000 hours

Kubota says change the front differential case oil and the front axle gear case oil every 1,000 hours.

Part	Qty	Notes	Part number
Front axle oil	1	SAE 80. ≈13 L differential case; ≈4.5 L gear cases. Oil type: check your handbook	check your handbook

Step-by-step

Park on level ground, lower implements, stop the engine, take the key out and chock the wheels.
Differential case: remove the drain and filler plugs and drain fully. Refit the drain plug, remove the level check plug and fill to the bottom of the check plug hole. Refit the plugs.
Gear cases: remove the right and left drain and filler plugs and drain fully. Refit the drain plugs and fill to the filler plug hole.
Wipe the axle clean so any leaks show up later.

Tools: Drain tray (20 L), Spanners, Oil pump or funnel

Engine valve clearance: dealer check

Engine · every 1,000 hours

Kubota lists engine valve clearance adjustment as a dealer job every 1,000 hours. The page layout in the source made the interval slightly unclear, so check your handbook. No clearance figure is given in the operator's manual.

Part	Qty	Notes	Part number
Valve clearance check	1	Dealer service	check your handbook

Step-by-step

Book this with a Kubota dealer.
Tell them about any change in noise, smoke or starting.

Tools: Dealer service

Crankcase oil separator element

Engine · every 1,500 hours

Kubota says replace the oil separator element every 1,500 hours. It stops oil mist from the crankcase getting into the intake.

Part	Qty	Notes	Part number
Oil separator element	1	Part number not found: check your handbook	check your handbook

Step-by-step

Stop the engine and take the key out.
Remove the cover and take out the old element.
Wipe oil and carbon out of the case with a clean rag.
Fit the new element and gasket and tighten the cover.
Run the engine and check for oil leaks around the cover.

Tools: Spanners, Clean rags

Coolant flush and change

Cooling · every 2,000 hours or every 2 years

Kubota says flush the cooling system and change the coolant every 2,000 hours or 2 years, whichever comes first. Genuine long-life coolant has a 2-year life.

Part	Qty	Notes	Part number
Kubota long-life coolant, 50/50 with soft water	1	≈15.9 L, plus ≈1 L with a cab	check your handbook

Step-by-step

Only work on a cold engine. Turn the radiator cap slowly to the first stop to let pressure out before taking it off.
Remove the radiator drain plug and cap and drain fully. Refit the plug.
Flush with clean soft water and cooling system cleaner as the cleaner's instructions say, then drain again.
Fill with a 50/50 mix of long-life coolant and soft water to just below the filler, and fill the recovery tank to the upper line.
Turn the heater to warm and run the engine until it warms up, then stop it. When cool, top up the recovery tank.
Never mix coolants of different makes or types, and dispose of old coolant properly.

Tools: Drain tray (20 L), Funnel, Cooling system cleaner, Rubber gloves

AdBlue (DEF) pump filter

Exhaust · every 3,000 hours

Kubota says replace the DEF pump filter every 3,000 hours. The DEF tank suction filter is a dealer job every 8,000 hours.

Part	Qty	Notes	Part number
DEF pump filter assembly	1	Part number not found: check your handbook	check your handbook

Step-by-step

Stop the engine and wait a few minutes. AdBlue keeps circulating after shutdown to cool the injector.
Undo the 4 bolts and remove the pump cover.
Clean around the plug, remove it, unscrew the old filter and fit the new one. Do not oil its O-ring.
Refit the plug and cover.
Every 3 months, smell the AdBlue in the tank. A strong ammonia smell means it has gone off: drain the tank, flush it with distilled water and refill.

Tools: Spanners or sockets, Clean rags, Gloves

DPF ash cleaning and DEF tank suction filter: dealer service

Exhaust · every 8,000 hours

Kubota says the DPF needs its ash removed every 8,000 hours using special equipment, and the DEF tank suction filter replaced at the same interval. Both are dealer jobs. At 3,000 hours the dealer also checks the turbo, supply pump, EGR and DEF injector.

Part	Qty	Notes	Part number
DPF clean and DEF tank suction filter	1	Dealer service	check your handbook

Step-by-step

Book this with a Kubota dealer. Do not take the DPF apart or clean it yourself.
Use only ultra-low sulphur diesel and the oil the handbook specifies; the wrong oil or fuel blocks the DPF faster.
Keep away from the exhaust and DPF until they have cooled, especially after a regeneration.

Tools: Dealer service equipment

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	Kubota V6108 6.1 L 4-cylinder turbo diesel, common rail, with DPF and SCR (AdBlue)
Engine oil	API CJ-4 (the handbook's DPF-type engine oil). Viscosity for your climate (SAE 10W-30 or 15W-40): check your handbook.	≈14.6 L with filter (Kubota handbook figure for the M6-131/M6-141 with the same V6108 engine)
Coolant	≈15.9 L, plus about 1 L more on cab tractors (heater circuit). 50/50 Kubota long-life coolant (ethylene glycol) and clean soft water.
Valve clearances	Dealer job. The handbook lists valve clearance adjustment as a dealer service but gives no clearance figure: check your handbook.
Transmission and hydraulics (shared)	Kubota SUPER UDT2	≈65 L
Front differential case	Check your handbook (the handbook's lubricants table lists SUPER UDT2 or SAE 80–90 gear oil for the front axle)	≈13 L
Front axle gear cases (hubs)	Check your handbook	≈4.5 L (not clear if each side or total; check your handbook)
Engine coolant	Kubota long-life coolant, 50/50 with clean soft water	≈15.9 L, plus ≈1 L with a cab
AdBlue (DEF)	AdBlue to ISO 22241-1	Check your handbook
Fuel tank	Diesel (ultra-low sulphur only, as the DPF and SCR need)	Check your handbook

Specifications


Engine	Kubota V6108 6.1 L 4-cylinder, turbo and intercooler, common rail
Engine power	≈142 hp rated; check your handbook for your build
Exhaust after-treatment	DOC and DPF plus SCR with AdBlue
Toe-in (front wheels)	2–8 mm
Fan and air-conditioner belt deflection	3–5 mm at 98 N pressed in the middle; self-tensioning
Fuel tank drain plug (M10) torque	22.8–26.2 Nm
King-pin adjusting screw / lock nut torque	4.9–9.8 Nm / 98.1–147 Nm
Compressed air for cleaning filters	Under 205 kPa (30 psi)
Tyre pressures	Check your handbook

Known problems

Check which M6-142 you have

The data here is for the M6001 series Stage IV M6-142, with intervals taken from Kubota's US handbook for the matching M6-131/M6-141. The later M6142 (M6002, Stage V, from c. 2020) may differ, so check your own handbook and serial number.

Genuine filters only

Kubota warns several times that non-genuine engine and hydraulic filters can cause serious damage.

Water in fuel

Poor care of the water separator and fuel filter damages the supply pump and injectors early. Drain the fuel tanks every 200 hours, and sooner if the fuel has water in it.

AdBlue goes off

Check the AdBlue every 3 months. A strong ammonia smell means it has degraded and should be drained and replaced.

Power shift calibration

If shifting feels rough, the handbook says a dealer should recalibrate the power shift and master clutches.

Fault codes: SAE J1939 engine codes: how to read SPN and FMI

Any modern electronic diesel engine

Code	Meaning	What to do
SPN 91	Accelerator pedal position	Power may be limited. Check the pedal plug.
SPN 94	Fuel delivery (lift pump / filter) pressure	Check fuel level and filters; look for air in the fuel.
SPN 97	Water in fuel	Drain the water separator.
SPN 100	Engine oil pressure	FMI 1 means stop at once. Check the oil level.
SPN 102	Boost (turbo) pressure	Check air filter and intake for leaks.
SPN 105	Intake manifold (charge air) temperature	Clean the cooler and intake.
SPN 110	Engine coolant temperature	FMI 0 means overheating: stop and let it cool.
SPN 157	Common rail fuel pressure	Check fuel filters. Call your dealer.
SPN 168	Battery voltage	Check the battery, terminals and alternator.
SPN 174	Fuel temperature	Call your dealer if high or erratic.
SPN 190	Engine speed	Check the sensor plug if the rev counter misbehaves.
SPN 1136	Engine controller temperature	Let it cool; check engine bay ventilation.
SPN 3216	SCR catalyst conversion efficiency (exhaust AdBlue system)	Check DEF quality and level. Call your dealer.
SPN 3361	DEF (AdBlue) dosing unit	Check the DEF tank level; call your dealer.
SPN 4094	DEF (AdBlue) tank level	Fill the DEF tank. Power will be cut if it runs out.
FMI 0	Reading valid but well above normal (most severe)	Treat as a real problem: stop and check, for example temperature or pressure.
FMI 1	Reading valid but well below normal (most severe)	Treat as a real problem: for oil pressure, stop the engine at once.
FMI 2	Erratic, intermittent or wrong data	Check the plug and wiring at the sensor.
FMI 3	Voltage above normal or wiring shorted to supply	Sensor or wiring fault. Check the plug.
FMI 4	Voltage below normal or wiring shorted to ground	Sensor or wiring fault. Check the plug.
FMI 5	Current below normal or open circuit	A wire has come off or a part has failed. Check the plug.
FMI 6	Current above normal or grounded circuit	A short to ground. Check wiring for chafing.
FMI 7	Mechanical part not responding or out of adjustment	Not electrical: check the part moves freely.
FMI 8	Abnormal frequency or pulse width	Signal fault. Check the sensor and wiring.
FMI 9	Abnormal update rate (message arriving too slowly or too fast)	Often a network fault. Switch off and restart.
FMI 10	Abnormal rate of change	Reading changing too fast. Check the sensor.
FMI 11	Failure detected, exact cause not known	Call your dealer.
FMI 12	Controller or device faulty	Usually needs a replacement part: call your dealer.
FMI 13	Out of calibration	Call your dealer to recalibrate.
FMI 14	Special instructions: the maker has its own steps	Call your dealer.
FMI 15 / 16	Reading above normal: least severe / moderately severe	Warning stage. Ease off and check, for example coolant.
FMI 17 / 18	Reading below normal: least severe / moderately severe	Warning stage. Check the system named.
FMI 19	Data received over the network carries an error flag	Check the sensor plugged into the other controller.
FMI 20 / 21	Data drifted high / drifted low compared with other readings	Sensor may be failing. Call your dealer.
FMI 31	The condition named by the SPN exists (no more detail), or not available	Read the SPN name for what it means.

Fault codes: Kubota common-rail engine codes (P and U codes, DPF and DEF)

Engine controller (Kubota V-series common-rail diesels)

Code	Meaning	What to do
P0087	Fuel rail pressure too low (pressure limiter opened)	Check fuel level and filters. Call your dealer.
P0088	Fuel rail pressure too high	Stop. Call your dealer.
P0089	Fuel pump control valve (SCV) stuck	Call your dealer.
P0093	High-pressure fuel leak	Stop. Look for fuel leaks but do not touch a leaking high-pressure line. Call your dealer.
P0101 / P0102 / P0103	Air flow (MAF) sensor fault or low air flow	Check the air filter and intake. Call your dealer if it persists.
P0112 / P0113	Intake air temperature sensor fault	Check the plug. Call your dealer.
P0117 / P0118	Coolant temperature sensor fault	Temperature reading unreliable: watch for overheating. Call your dealer.
P0182 / P0183	Fuel temperature sensor fault	Call your dealer.
P0192 / P0193	Rail pressure sensor fault	Call your dealer.
P0217	Engine overheating	Stop and idle, then switch off. Check coolant (cold only) and radiator.
P0219	Engine overspeed	Switch off. Call your dealer.
P0237 / P0238	Intake air pressure sensor fault	Call your dealer.
P0335 / P0336	Crankshaft sensor fault	Hard starting or stalling. Call your dealer.
P0340 / P0341	Camshaft (cylinder recognition) sensor fault	Hard starting. Call your dealer.
P0380 / P0381	Glow plug (air heater) relay fault	Hard cold starting. Check the heater fuse; call your dealer.
P0400 / P2413 / P2414	EGR (exhaust recirculation) valve fault or stuck	Call your dealer.
P0501 / P0503	Vehicle speed sensor fault	Check the plug. Call your dealer.
P0524	Engine oil pressure fault	Stop the engine. Check the oil level; call your dealer if it is right.
P0543 to P0547	Exhaust gas temperature sensor fault (DPF)	Call your dealer.
P0561 to P0563	Battery voltage fault	Check the battery, terminals and alternator.
P0605 / P0606	Engine controller (ECU) memory or processor fault	Call your dealer.
P0616 / P0617	Starter switch circuit fault	Check the key switch and starter fuses. Call your dealer.
P062B / P062D	Injector drive fault	Rough running. Call your dealer.
P0687	Main relay fault	Check the relay and fuse. Call your dealer.
P1990	Controller memory (EEPROM) checksum error	Call your dealer.
P204F / P20F5	DEF (AdBlue) level too low	Fill the DEF tank. If you ignore it, power will be cut back.
P208B	DEF (AdBlue) freeze warning	Let the system thaw. Do not add water.
P2122 to P2135	Accelerator pedal sensor faults (sensor 1 / 2 / CAN / correlation)	Power may be limited. Check the plugs; call your dealer.
P2227 to P2229	Atmospheric pressure sensor fault	Call your dealer.
P2293	Rail pressure sensor fault after pressure limiter opened	Stop and call your dealer.
P242C / P242D	Exhaust gas temperature sensor 2 fault	Call your dealer.
P2454 / P2455	DPF differential pressure sensor fault	Call your dealer.
P2621 / P2622	Intake throttle lift sensor fault	Call your dealer.
P3001	Emissions deterioration detected	Call your dealer.
P3002 to P3004	Exhaust gas temperature too high (emergency)	Stop and move away from flammable material. Switch off and call your dealer.
P3006 to P3008	Excessive soot in the DPF	Do a parked regeneration if the handbook allows. If it stays, call your dealer.
P3011	Boost pressure low	Check air filter and intake for leaks. Call your dealer.
P3013	Parked regeneration timed out	Try again in a safe open place. Call your dealer if it fails.
P3023 / P3025	Exhaust temperature high after a warning (overheat pre-caution)	Park clear of crop or straw and let it cool. Call your dealer.
P3024	DPF regenerating too often	Check oil grade and running pattern. Call your dealer.
U0075 / U0077	CAN bus off	Switch off and restart. Call your dealer if it returns.
U0076	No communication with the EGR actuator	Call your dealer.
U0081 to U0089	CAN message (frame) errors between controllers	Switch off and restart. Call your dealer if it returns.

Fault codes: Kubota M series tractor E codes (display error numbers)

Main, meter and engine controllers

Code	Meaning	What to do
E-1 / E-2 / E-3	Accelerator sensor fault (main / sub / main and sub disagree)	Engine power may be limited. Check the pedal and hand throttle plugs. Call your dealer.
E-4 / E-5 / E-6 / E-7	Forward/reverse shuttle lever sensor fault (main / sub / disagree / signal)	Shuttle may not work. Check the lever plug under the column. Call your dealer.
E-8	Gear lock signal fault	Call your dealer.
E-11	PTO relay fault	PTO may not engage. Check the PTO fuse and relay.
E-12	4WD solenoid fault	Four-wheel drive may not engage. Call your dealer.
E-13	Bi-speed turn solenoid fault	Call your dealer.
E-14 / E-15	Shuttle forward solenoid fault	Call your dealer.
E-17	Differential lock solenoid valve fault	Differential lock may not work. Call your dealer.
E-20	Engine controller to instrument panel communication fault	Switch off and restart. Call your dealer if it returns.
E-21	Range gear shift (high) switch fault	Call your dealer.
E-22	Main gear shift (6th) switch fault	Call your dealer.
E-23	Shuttle rotating sensor fault	Call your dealer.
E-24	Machine speed sensor fault	Check the sensor plug. Call your dealer.
E-25	DPF regeneration malfunction	Do a parked regeneration as the handbook says (safe open place, enough fuel). If the code remains, call your dealer.
E-30	Controller memory fault	Call your dealer.
E-31	Instrument panel and controller part code mismatch	Call your dealer.
E-40	Lever sensor input voltage fault	Call your dealer.
E-41	Engine communication fault (engine controller and main controller)	Switch off, wait a minute and restart. The workshop manual says this one is normally only logged in the error history, not shown on the meter.
E-42	Meter and main controller communication fault (also logged-only per the workshop manual)	Switch off and restart. Call your dealer if it shows.
E-43	Controller or meter communication fault	Switch off and restart. Call your dealer if it shows.
E-50	Shift lever sensor fault	Call your dealer.
E-60	Proportional pressure reducing valve failure	Gear changes may be poor. Call your dealer.
E-61 to E-66	Transmission solenoid 1 to 6 fault	A gear or range may be lost. Call your dealer.
E-75	Accelerator sensor reading out of range	Call your dealer.
E-84	Accelerator sensor needs adjusting	Call your dealer to set it up.
E-93	Engine starter relay fault	Check the starter relay and fuse. Call your dealer.
E-94	Engine shut-off relay fault	Check the relay and fuse. Call your dealer.
E-95	PTO solenoid fault	PTO may not engage. Call your dealer.
E-99	Communication fault	Switch off and restart. Call your dealer if it returns.
ENG NG	Engine controller communication failure	Switch off and restart. Check the fuses and plug on the engine controller. Call your dealer.
ECU NG	Main controller communication failure	Switch off and restart. Call your dealer if it returns.
ERROR-NET	Network (CAN) communication fault	Switch off and restart. Call your dealer if it returns.
E00	Instrument panel memory fault	Call your dealer.

Fault codes: M6-101 to M6-141 fuse box 1

Fuses and relays

Code	Meaning	What to do
Spare (top row)	5 A, 10 A, 15 A and 20 A spares	Keep them for replacement, same ratings only.
Brake lamp	10 A	Same rating only. Check brake lights before road use.
Work light (cabin side)	15 A	Same rating only.
ECU (suspension)	10 A (not on all models)	Same rating only.
Switch (transmission control)	5 A	Same rating only.
Work light (front upper)	15 A	Same rating only.
Head lamp	15 A	Same rating only. Needed for road use.
ECU (switch)	5 A	Same rating only.
Switch (hitch control)	5 A	Same rating only.
Air conditioner fan motor	30 A	Same rating only.
Defogger	30 A	Same rating only.
ECU (main)	10 A	Same rating only. If it keeps blowing have the wiring checked.
Air conditioner compressor	10 A	Same rating only.
Main meter	7.5 A	Same rating only.
Option lamp	10 A	Same rating only.
Tail lamp	15 A	Same rating only. Needed for road use.
4WD brake	10 A	Same rating only.
4WD, bi-speed, differential lock	5 A	Same rating only.
Work light (rear)	15 A	Same rating only.
Hazard	15 A	Same rating only.
Radio	5 A	Same rating only.
Engine control, PTO valve	5 A	Same rating only. The engine may not run or the PTO may not engage if it is blown.
Work light (bonnet)	10 A	Same rating only.
Dome light, radio	10 A	Same rating only.
Air conditioner (fan control)	5 A	Same rating only.
Turn signal	10 A	Same rating only. Needed for road use.
Seat compressor	15 A	Same rating only.
Horn	10 A	Same rating only.
Wiper	15 A	Same rating only.
Loader power, aux socket	15 A	Same rating only.
Cigarette socket	15 A	Same rating only.
Loader plug	15 A	Same rating only.
Starter relay	5 A	Same rating only. The engine will not crank if it is blown.
Seat switch	5 A	Same rating only.
Back-up (ECU, meter)	5 A	Same rating only.
Work light (option)	15 A	Same rating only.

Repair guides

DPF regeneration and AdBlue warnings (Specialist, 30 minutes for owner checks; a parked regeneration usually takes 15–20 minutes): Regeneration or engine-speed lamp flashing, buzzer sounding, parked regeneration lamp flashing, power cut to about half, engine held at idle, AdBlue lamp or icon on the display, strong ammonia smell from the AdBlue tank.
Power shift warnings, limp-home and calibration (Specialist, 30 minutes for owner checks; calibration and repairs are a dealer job): Rough or jerky gear changes, three-tone alarm, E-R error code or flashing gear number on the display, master system warning lamp flashing, tractor will only drive in some gears or not at all, drops to a low gear on its own.
Brake pedal, parking brake and wheel nut checks (Moderate, 30–60 minutes): Tractor pulls to one side under braking, long or uneven pedal travel, parking brake lever pulls up too far or does not hold, wheel nuts loose or wheel wobbling.
Overheating, fan belt and air conditioning checks (Moderate, 1–2 hours): Temperature gauge high or engine warning lamp with a high gauge, belt squeal, air conditioning blowing warm, bubbles in the A/C sight glass, dusty cab air.
Water in fuel, bleeding and starting faults (Moderate, 30–90 minutes): Water separator lamp on with the buzzer, hard starting or no start, engine stalls or loses power, engine stopped after running out of fuel, no crank, slow cranking in the cold.

The full step-by-step guides are in Farmyard Workshop once you add your tractor.

Parts list with genuine part numbers

Kubota M6-142 - maker filter/service sheets and parts lists already cited on the site entry; serial splits are in the row notes

Cab

Part	Part number	Qty	Notes
Cab air filter	6A671-75090	2	Listed as quantity 2 in the M6-142 catalogue. Which slot each one fits: check your handbook
Cab filter	T1855-71600	1	Listed as 'Kabinenfilter' in the M6-142 catalogue

Engine service

Part	Part number	Qty	Notes
Engine oil filter cartridge	HH1G0-32430	1	From the M6-142 parts catalogue
Air cleaner outer element	3U503-11210	1	From the M6-142 parts catalogue
Air cleaner inner element	3U503-11220	1	From the M6-142 parts catalogue

Fuel

Part	Part number	Qty	Notes
Fuel filter cartridge	HH1J0-43172	1	From the M6-142 parts catalogue (fuel filter section)
Fuel filter (second filter)	1G410-52300	1	Listed as a frequently used part in the M6-142 catalogue. Which housing it fits is not clear: check your handbook
Water separator element	1G311-43380	1	With O-ring; from the M6-142 parts catalogue

Other service parts

Part	Part number	Qty	Notes
Suction filters	3U503-82570	2	Listed as suction filters, quantity 2, in the M6-142 catalogue. Confirm with your dealer
Genuine 1,000 h service kit	W21TK00272	1	Alternative to buying parts singly; kit contents not itemised by retailers

Transmission and hydraulics

Part	Part number	Qty	Notes
Hydraulic oil filter cartridge	3U503-82590	1	Listed in the M6-142 catalogue's frequently used parts as a cartridge filter, but labels conflict (see notes). Confirm with your dealer

Sources

Open Farmyard Workshop