Kubota M100GX / M110GX / M126GX / M135GX service schedule

Kubota MGX · check your handbook

Every maker's service job for the Kubota M100GX / M110GX / M126GX / M135GX, 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 M100GX / M110GX / M126GX / M135GX for free

Versions: M100GX, M110GX; M126GX, M135GX

Service intervals

Job	When
Air cleaner primary element clean / replace	every 100 hours or every year
Grease fittings and battery check	every 100 hours
Hydraulic oil filter	every 300 hours
Engine oil and filter change	every 400 hours or every year
Fuel filter, pre-filter and water separator	every 400 hours or every year
Transmission fluid change	every 600 hours
Front differential and front axle gear case oil	every 600 hours

Service jobs and parts

Air cleaner primary element clean / replace

Engine · every 100 hours or every year

The service chart lists cleaning the air cleaner primary element every 100 hours and replacing the primary and secondary elements every year.

Part	Qty	Notes	Part number
Primary air cleaner element	1	Kubota number per FridayParts kit listing for M126GX/M135GX (also listed 3P300-11221/-11222)	3P300-11220
Secondary air cleaner element	1	Kubota number per FridayParts kit listing (also 3P300-11231). Partao lists the inner element as OEM K7561-82780 for the same models: check with your dealer	3P300-11230

Step-by-step

Take out the primary element and clean it; replace both elements once a year.

Tools: Compressed air at low pressure

Grease fittings and battery check

Chassis · every 100 hours

The service chart lists greasing at every 100 hours (more often in wet, muddy work). The page I could read showed the front axle support fitting; check your handbook for the full list.

Part	Qty	Notes	Part number
Multipurpose grease	1	NLGI 2 grease (NLGI 1 in cold weather). NLGI-2 grease (NLGI-1 for cold weather). Aztec Oils match: VOLCATEC LITHIUM EP 2	check your handbook

Step-by-step

Wipe the nipples and grease them until fresh grease shows, including the front axle support.
Check the battery condition at the same time.

Tools: Grease gun

Hydraulic oil filter

Hydraulics · every 300 hours

The service chart lists replacing the hydraulic oil filter at every 300 hours, more often than the transmission fluid itself.

Part	Qty	Notes	Part number
Hydraulic oil filter	1	Check your handbook or parts book	check your handbook

Step-by-step

Stop the engine and let the oil cool. Remove the old filter over a tray.
Coat the new filter's seal with clean transmission oil, fit it and tighten as shown in your handbook.
Run the engine, recheck the transmission oil level at the dipstick and look for leaks.

Tools: Drain tray, Filter wrench, Gloves

Engine oil and filter change

Engine · every 400 hours or every year

Kubota's service chart puts the engine oil change at every 400 hours, with the oil filter in the same 400-hour group. Use DPF-compatible CJ-4 oil.

Part	Qty	Notes	Part number
Engine oil	1	15W-40 or 10W-30. API CJ-4 (DPF-compatible), M100GX/M110GX 10.5 L, M126GX/M135GX 14.6 L with filter. Aztec Oils match: EMPROTEC UHPD-X 15W-40	check your handbook
Engine oil filter	1	Kubota-format number from an aftermarket cross-reference listing the M126GX and M135GX; confirm against the old filter	HH1G0-32430

Step-by-step

Stop the engine and let it cool until the oil will not burn you. Warm oil drains best.
Remove the drain plug at the bottom of the engine, drain the oil completely into the tray and refit the plug.
Replace the oil filter as shown in the manual under Replacing Engine Oil Filter, wiping a film of clean oil on the new seal.
Fill with CJ-4 oil to the upper notch on the dipstick.
Run the engine briefly, check for leaks, then recheck the dipstick and top up.

Tools: Drain tray (20 L), Filter wrench, Funnel, Gloves

Fuel filter, pre-filter and water separator

Fuel · every 400 hours or every year

The service chart lists cleaning the pre-fuel filter, replacing the fuel filter and cleaning the water separator under the 400-hour group. A fuel filter replacement also appears under 800 hours, so check your handbook for which filter that is.

Part	Qty	Notes	Part number
Fuel filter	1	Kubota-format number from an aftermarket cross-reference listing M126GX and M135GX; confirm against your old filter	1G410-52300
Water separator element	1	Check your handbook	check your handbook

Step-by-step

Clean the pre-fuel filter and water separator, and replace the fuel filter, as shown in your handbook.
Bleed the fuel system afterwards.

Tools: Container for fuel, Kerosene for rinsing, Filter wrench, Gloves

Transmission fluid change

Transmission · every 600 hours

The service chart lists changing the transmission fluid at every 600 hours. Use Kubota Super UDT or UDT2 fluid. The hydraulic filter has its own, shorter 300-hour job, so fit a new one at this change as well.

Part	Qty	Notes	Part number
Transmission and hydraulic oil	1	UTTO tractor transmission-hydraulic fluid. Kubota Super UDT2 fluid, 65 L as printed on the change page	check your handbook
Hydraulic oil filter	1	Check your handbook or parts book	check your handbook

Step-by-step

Let the engine cool enough that the oil will not burn you.
Remove the drain plug at the bottom of the transmission case and drain the oil completely. Wipe the metal filings off the magnetic plug.
Refit the drain plug and fill with Kubota Super UDT fluid up to the upper notch on the dipstick.
Run the engine for a few minutes, stop it and recheck, topping up inside the dipstick range. Do not work the tractor hard straight after the change.

Tools: Large drain tray (70 L), Funnel, Rags for the magnetic plug

Front differential and front axle gear case oil

Drivetrain · every 600 hours

The service chart lists both at every 600 hours. Capacities are M100GX/M110GX 7 L and 3.5 L each side, M126GX/M135GX 13 L and 4.5 L each side.

Part	Qty	Notes	Part number
Front differential oil	1	Kubota Super UDT2 or SAE 80 to 90 gear oil. M100GX/M110GX 7 L, M126GX/M135GX 13 L	check your handbook
Front axle gear case oil (each side)	2	Kubota Super UDT2 or SAE 80 to 90 gear oil. M100GX/M110GX 3.5 L, M126GX/M135GX 4.5 L each	check your handbook

Step-by-step

Differential: remove the drain and filling plugs and drain completely. Refit the drain plug, remove the level check plug and fill to the lower rim of the check port, then refit the plugs.
Axle gear cases: remove the right and left drain and filling plugs, drain, refit the drain plugs, fill each side up to the filling plug port and refit.

Tools: Drain tray, Funnel, Socket set

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	Kubota diesel with DPF (DPF-compatible oil required)
Engine oil	15W-40 or 10W-30, API CJ-4 (DPF-compatible). The manual also lists SAE 30 above 25 C, SAE 20 from 0 to 25 C and SAE 10W below 0 C.	M100GX/M110GX 10.5 L with filter; M126GX/M135GX 14.6 L with filter
Coolant	Clean soft water with antifreeze. Check your handbook for the amount and the change interval (the manual has a separate 2-year coolant section).
Valve clearances	Check your handbook (valve clearance is an 800-hour job)
Engine oil	15W-40 or 10W-30, API CJ-4	M100GX/M110GX 10.5 L; M126GX/M135GX 14.6 L (with filter)
Transmission and hydraulics	Kubota Super UDT2 fluid	65 L as printed on the change page
Front differential case	Kubota Super UDT2, or SAE 80 to 90 gear oil	M100GX/M110GX 7 L; M126GX/M135GX 13 L
Front axle gear case (each side)	Kubota Super UDT2, or SAE 80 to 90 gear oil	M100GX/M110GX 3.5 L; M126GX/M135GX 4.5 L
Fuel	No. 2-D S15 diesel (No. 1-D below -10 C)	Check your handbook
Grease	Multipurpose NLGI-2 (NLGI-1 for cold weather)	Check fittings in your handbook

Specifications


Fuel line, radiator hoses, power steering hoses	Replace every 2 years (service chart)

Known problems

Transmission capacity

The change page prints 65 L without separating the M100GX/M110GX from the M126GX/M135GX, so check your handbook.

Chart layout

The online copy of the service chart is scrambled, so intervals come from the manual's section headings.

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.

Repair guides

Particulate filter (DPF) warning: DPF-compatible oil and the engine oil filter (Moderate, 45 minutes): DPF warning, a dirty filter message, or an engine oil service due on a Kubota M7 or M-GX.
Hard starting or power loss: fuel pre-filter, fuel filter and water separator (Moderate, 45 minutes): Engine slow to start, losing power, water in the separator, or a fuel filter service due.
Weak hydraulics or steering: hydraulic and transmission filters, and the right UDT fluid (Moderate, 1–1½ hours): Slow lift, noisy hydraulic pump, heavy steering, or hydraulic filters due.
Fan belt tension (M7) and the two-year hose replacement (M-GX) (Easy, 30–60 minutes): Squealing belt, charging fault, overheating, or hoses that are cracked, soft or old.

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

Parts list with genuine part numbers

Kubota M100GX / M110GX / M126GX / M135GX - maker filter/service sheets and parts lists already cited on the site entry; serial splits are in the row notes

Engine service

Part	Part number	Qty	Notes
Engine oil filter	HH1G0-32430	1	Kubota-format number from an aftermarket cross-reference listing the M126GX and M135GX; confirm against the old filter
Primary air cleaner element	3P300-11220	1	Kubota number per FridayParts kit listing for M126GX/M135GX (also listed 3P300-11221/-11222)
Secondary air cleaner element	3P300-11230	1	Kubota number per FridayParts kit listing (also 3P300-11231). Partao lists the inner element as OEM K7561-82780 for the same models: check with your dealer

Fuel

Part	Part number	Qty	Notes
Fuel filter	1G410-52300	1	Kubota-format number from an aftermarket cross-reference listing M126GX and M135GX; confirm against your old filter

Sources

Open Farmyard Workshop