New Holland T6.145 / T6.155 / T6.160 / T6.165 / T6.175 / T6.180 service schedule

New Holland T6 series · 2015–2021 (Stage IV / Tier 4B)

Covers the New Holland T6.145 / T6.155 / T6.160 / T6.165 / T6.175 / T6.180 (Stage IV; Electro Command, Dynamic Command, Auto Command).

Every maker's service job for the New Holland T6.145 / T6.155 / T6.160 / T6.165 / T6.175 / T6.180, 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 T6.145 / T6.155 / T6.160 / T6.165 / T6.175 / T6.180 for free

Versions: Electro Command; Dynamic Command; Auto Command (CVT)

Service intervals

Job	When
Cab filter, coolers and SCR duct clean	every 50 hours
Grease all fittings	every 50 hours
Drive belts and compressor belt	every 100 hours
Level checks	every 300 hours
Engine oil and filter change	every 600 hours
Fuel filters (first-stage filter and filter element)	every 600 hours
Engine air cleaner outer element	every 600 hours
Charge pump oil filter	every 600 hours
Cab air filters	every 1,200 hours or every year
Front axle differential oil change	every 1,200 hours or every year
Front hub (planetary) oil change	every 1,200 hours or every year
Front PTO gearbox oil change	every 1,200 hours or every year
AdBlue (DEF) in-line filter	every 1,200 hours or every 2 years
Transmission, rear axle and hydraulic oil change (with suction filter)	every 1,200 hours or every 2 years
Engine air cleaner inner element	every 1,200 hours or every 2 years
Valve clearance check	every 1,200 hours or every 2 years
Engine breather filter	every 1,800 hours or every 2 years
AdBlue (DEF) main filter	every 3,600 hours or every 2 years
Engine coolant change	every 3,600 hours or every 4 years
Air conditioning receiver-drier and air brake dryer	every 2 years

Service jobs and parts

Cab filter, coolers and SCR duct clean

Cooling · every 50 hours

The manual's every-50-hours group lists cleaning the cab air filter, the cooler section and the SCR cover air ducts, greasing all fittings, and checking the wheel nuts and tyre pressures. Blocked coolers cause overheating.

Step-by-step

Stop the engine, let it cool and take the key out.
Clean the cab air filter.
Blow or wash the radiator and coolers clean from the engine side outwards.
Clean the air ducts on the SCR cover.
Check the wheel nuts and the tyre pressures.

Tools: Compressed air or soft hose, Soft brush, Dust mask

Grease all fittings

Chassis · every 50 hours

The manual's every-50-hours group lists 'All grease fittings'. The positions differ by axle and options, so use the grease point diagram in your handbook. The rear axle shaft bearing is greased at a longer interval (see the longer service).

Part	Qty	Notes	Part number
Multi-purpose EP grease	1	NLGI 2. Aztec Oils match: VOLCATEC LITHIUM EP 2	check your handbook

Step-by-step

Wipe each grease nipple clean.
Grease every nipple on the front axle, steering, linkage and any suspension as your handbook's diagram shows.
Wipe off excess grease.

Tools: Grease gun, Rags

Drive belts and compressor belt

Engine · every 100 hours

The the Stage IV operator's manual lists inspecting the poly-V belt and the compressor drive belt every 100 hours. The poly-V belts are changed every 1,200 hours or 2 years.

Part	Qty	Notes	Part number
Poly-V belt	1	8PK1550 belt, quoted on Agriline's T6.165 cooling page as 4899178 / 5802350476 / 944032610. A 4PK belt (87710661) is also listed there for another drive; confirm length on your old belt.	4899178

Step-by-step

Stop the engine, take the key out and look at each belt for cracks, glazing and fraying.
Check the tension as your handbook shows.
Replace any belt that is worn.

Tools: Torch, Belt tension gauge or handbook method

Level checks

Transmission · every 300 hours

The the Stage IV operator's manual's every-300-hours group lists the battery fluid level, the transmission, rear axle and hydraulic oil level, the 4WD front axle differential and hub oil levels, and the front PTO gearbox oil level, plus handbrake adjustment.

Step-by-step

Park on level ground, engine off, key out.
Check the transmission and hydraulic oil level on its dipstick or sight glass.
Check the front axle differential and hub oil levels and the front PTO gearbox level.
Check the battery fluid if the battery has caps.

Tools: Rags, Torch

Engine oil and filter change

Engine · every 600 hours

The the Stage IV operator's manual lists 'Change engine oil and filter' in its every-600-hours group. It gives no month limit, so many owners also change it once a year. Oil and filter are always done together.

Part	Qty	Notes	Part number
Engine oil	1	Quantity and grade: check your handbook	check your handbook
Engine oil filter	1	New Holland dealer lists it for T6.145 3/15–9/21, T6.155 2/12–12/21, T6.165 2/12–6/21, T6.175 2/12–12/20, T6.180 3/15 on (T5.110 to T5.140 from 6/19). Also sold as Fleetguard LF16117 / LF16520	84228488

Step-by-step

Warm the engine, park on level ground, lower the linkage, loader and any implement, stop the engine, take the key out and chock the wheels.
Let it stand a few minutes. Hot oil burns, so wear gloves.
Remove the sump plug and let the oil drain fully.
Remove the filter, check the old seal came off with it, and wipe the filter head clean.
Oil the new filter seal and fit it hand-tight.
Refit the plug and fill with the oil your handbook specifies to the full mark.
Run the engine for a minute, check for leaks, stop it and recheck the level.

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

Fuel filters (first-stage filter and filter element)

Fuel · every 600 hours

The the Stage IV operator's manual lists 'Change the first stage fuel filter and the fuel filter element' in its every-600-hours group. Drain the water separator whenever the warning shows.

Part	Qty	Notes	Part number
Fuel filter (main)	1	Listed for T6.145 3/15–9/21, T6.155 3/15–12/21, T6.165 3/15–6/21, T6.175 3/15–12/20, T6.180 3/15–10/21 and T5.110 to T5.140 from 6/19. Replaces 84209753 and 84175081	84526251
Fuel pre-filter / water separator	1	New Holland dealer lists it for the T6.145 to T6.180 and T5 tractors; replaces 47509565 and 47509572. Also sold as Fleetguard FS20014	84278636

Step-by-step

Check your build date and the filter numbers before ordering.
Stop the engine, take the key out and chock the wheels. Keep naked flames away.
Clean round both filter heads before opening anything.
Drain the water separator into a container, then remove the old filters.
Fit the new filters with clean seals and bleed the system as your handbook describes. Never crack open the high-pressure pipes.
Start the engine and check for leaks.

Tools: Container for fuel, Filter wrench, Rags, Gloves

Engine air cleaner outer element

Engine · every 600 hours

The the Stage IV operator's manual lists 'Change the engine air cleaner outer element' in its every-600-hours group, and also says change it when the warning lamp lights. Fit it sooner in dusty work. It also lists an air intake connection check at the same interval.

Part	Qty	Notes	Part number
Air cleaner outer element	1	No genuine number found for the T6.145 to T6.180; check your handbook	check your handbook

Step-by-step

Stop the engine and take the key out. Never run the engine with the filter out.
Open the housing and take out the outer element. Leave the inner element in unless it is due.
Wipe the housing out with a damp cloth. Do not blow dirt down the intake.
Check the air intake hoses and clips for cracks and loose joints.
Fit the new outer element, check it seats evenly and close the housing.

Tools: Torch, Damp cloth

Charge pump oil filter

Hydraulics · every 600 hours

The the Stage IV operator's manual lists 'Change the charge pump oil filter' in its every-600-hours group. Dealer parts lists show two filter numbers for these tractors, so check your handbook for which is on yours.

Part	Qty	Notes	Part number
Hydraulic filter element	1	Replaces 84417139. New Holland dealer lists it for T6.145 3/15 on, T6.155, T6.165 and T6.175 3/15 on, T6.180 7/18 on (T5.110 to T5.140 from 2/23)	90433749
Hydraulic filter (spin-on)	1	New Holland dealer lists it for T6.145 3/15–9/21, T6.155 and T6.175 3/15–10/20, T6.165 3/15–6/21, T6.180 7/18–9/21. Now replaced by 92689295	87588814

Step-by-step

Park on level ground, lower the linkage, loader and implements, stop the engine, take the key out and chock the wheels.
Clean round the filter housing and have a tray ready for oil.
Remove the old filter, oil the seal of the new one and fit it as your handbook shows.
Run the engine, work the hydraulics through their full travel, then stop and check the oil level and for leaks.

Tools: Drain tray, Filter wrench, Rags, Gloves

Cab air filters

Cab · every 1,200 hours or every year

The the Stage IV operator's manual says clean the cab air filter every 50 hours and change the cab air filters every 1,200 hours or annually. Change sooner in dusty work.

Part	Qty	Notes	Part number
Cab filter	1	New Holland dealer lists it for the T6.145 to T6.180 from 2015 and the T5.110 to T5.140 from 6/19. Replaces 87302687 and 82034692	87726699
Cab filter (alternative)	1	Same dealer lists it for the same tractors; now replaced by 47863571. Check which filter your tractor has	87726675

Step-by-step

Stop the engine and take the key out.
Open the filter covers and remove the elements, wearing a dust mask.
Fit the new filters and check the covers seal.

Tools: Screwdriver, Dust mask

Front axle differential oil change

Front axle · every 1,200 hours or every year

The the Stage IV operator's manual lists 'Change the 4WD differential oil' in its every-1,200-hours-or-annually group.

Part	Qty	Notes	Part number
Front axle differential oil	1	Quantity and spec: check your handbook. (The older T6.140 service manual gives about 9 L)	check your handbook

Step-by-step

Park on level ground, lower implements, stop the engine, take the key out and chock the wheels.
Drain the axle centre, refit the plug and fill to the level plug or mark.
Check the front hubs for leaks.

Tools: Drain tray, Spanners, Oil pump or squeeze bottle

Front hub (planetary) oil change

Front axle · every 1,200 hours or every year

The the Stage IV operator's manual lists 'Change the 4WD planetary hub oil' in its every-1,200-hours-or-annually group.

Part	Qty	Notes	Part number
Front hub oil	2	Quantity and spec: check your handbook. (The older T6.140 service manual gives about 1.25 L per hub, or 3.0 L with front brakes)	check your handbook

Step-by-step

Park on level ground, lower implements, stop the engine, take the key out and chock the wheels.
Turn each hub so its plug is in the drain position your handbook shows and drain it.
Refit the plug and fill to the level mark.
Do both hubs.

Tools: Drain tray, Spanners, Oil pump or squeeze bottle

Front PTO gearbox oil change

Transmission · every 1,200 hours or every year

The the Stage IV operator's manual lists 'Change the front PTO gearbox oil' in its every-1,200-hours-or-annually group. Fitted tractors only.

Part	Qty	Notes	Part number
Front PTO gearbox oil	1	Quantity and spec: check your handbook	check your handbook

Step-by-step

Stop the engine, take the key out and chock the wheels.
Drain the gearbox, refit the plug and fill to the level mark.
Check for leaks.

Tools: Drain tray, Spanners

AdBlue (DEF) in-line filter

Exhaust · every 1,200 hours or every 2 years

The the Stage IV operator's manual says clean the DEF in-line filter in the every-600-hours group and change it every 1,200 hours or 2 years. The main DEF filter is a separate, longer job.

Part	Qty	Notes	Part number
AdBlue (DEF) filter	1	New Holland dealer lists it for T6.145 3/15–9/21, T6.155 and T6.165 and T6.175, T6.180 3/15–10/21. Replaces 47661360. Check your handbook for whether this is the in-line or the main filter	47657024

Step-by-step

Stop the engine, take the key out and let the exhaust and dosing system cool.
Clean round the filter so no dirt gets in. AdBlue is corrosive, so wear gloves.
At 600 hours take the in-line filter out and clean it. At 1,200 hours or 2 years fit a new one.
Rinse spilt AdBlue off with water and check the display for warnings after starting.

Tools: Rags, Gloves, Container

Transmission, rear axle and hydraulic oil change (with suction filter)

Transmission · every 1,200 hours or every 2 years

The the Stage IV operator's manual lists 'Change the transmission oil, rear axle oil and hydraulic oil' every 1,200 hours or 2 years, and the hydraulic suction pump oil filter in the same service. The suction filter goes in with the oil, as Steve's rule asks. One oil is shared by the transmission, rear axle and hydraulics.

Part	Qty	Notes	Part number
Transmission and hydraulic oil	1	Quantity and spec: check your handbook. (The older T6.140 service manual gives about 62 L for Electro Command and 65.5 L for Dual Command, but check yours)	check your handbook
Hydraulic suction pump oil filter	1	New Holland dealer lists it for T6.145 3/15 on, T6.150 2/12–10/18, T6.155 to T6.175 2/12 on, T6.180 7/18 on. Replaces 87395844 and 47617638	87708150

Step-by-step

Park on level ground, lower the linkage, loader and implements fully, stop the engine, take the key out and chock the wheels.
Work the controls with the engine off to relieve pressure, then let hot oil cool a while.
Drain the oil from the transmission and axle drain plugs and refit the plugs.
Change the suction filter.
Fill with the specified oil to the level mark, run the engine, work the hydraulics through their full travel, lower everything and recheck the level.

Tools: Large drain tray (80 L), Spanners, Filter wrench, Pump or funnel, Gloves

Engine air cleaner inner element

Engine · every 1,200 hours or every 2 years

The the Stage IV operator's manual lists 'Change the engine air cleaner inner element' every 1,200 hours or 2 years.

Part	Qty	Notes	Part number
Air cleaner inner element	1	Inner element; Agriline's inner-filter page names T6.165 and quotes 73176005, 82028151, 82034622, 87683000 (older or alternative numbers). Check against your serial number.	82028151

Step-by-step

Stop the engine and take the key out.
Take out the outer element, then pull out the inner element.
Wipe the housing clean.
Fit the new inner element, then the outer element, and close the housing.

Tools: Torch, Damp cloth

Valve clearance check

Engine · every 1,200 hours or every 2 years

The the Stage IV operator's manual lists 'Check the valve tappet clearance' every 1,200 hours or 2 years. The clearances are in your handbook or service manual.

Part	Qty	Notes	Part number
Rocker cover gasket	1	Check your handbook	check your handbook

Step-by-step

Do it with the engine cold and the key out.
Follow the service manual to set the engine and check the clearances.
Adjust any out-of-limit valves and recheck, then refit the cover.

Tools: Feeler gauges, Service manual, Torque wrench

Engine breather filter

Engine · every 1,800 hours or every 2 years

The Stage IV manual lists 'Replace engine breather filter' every 1,800 hours or 2 years.

Part	Qty	Notes	Part number
Crankcase breather filter	1	Check your handbook	check your handbook

Step-by-step

Stop the engine, take the key out and let the engine cool.
Clean round the housing, take off the cover and fit the new element.
Run the engine and check for oil leaks.

Tools: Spanners or screwdriver, Rags

AdBlue (DEF) main filter

Exhaust · every 3,600 hours or every 2 years

The the Stage IV operator's manual lists the DEF main filter every 3,600 hours or 2 years.

Part	Qty	Notes	Part number
AdBlue (DEF) main filter	1	Check your handbook	check your handbook

Step-by-step

Stop the engine, take the key out and let the exhaust and dosing system cool.
Clean round the filter housing so no dirt gets in. Wear gloves.
Fit the new main filter as your handbook shows.
Check the display for warnings after starting.

Tools: Rags, Gloves, Container

Engine coolant change

Cooling · every 3,600 hours or every 4 years

The the Stage IV operator's manual lists the engine coolant every 3,600 hours or 4 years. Quantity and type: check your handbook.

Part	Qty	Notes	Part number
Coolant	1	Type and quantity: check your handbook	check your handbook

Step-by-step

Only work on a cold engine. Open the cap slowly to let pressure out.
Drain the radiator and block into a tray and dispose of the old coolant properly.
Fill with the coolant your handbook specifies.
Run the engine to working temperature with the heater on, let it cool and top up.

Tools: Drain tray, Hose, Coolant test strips

Air conditioning receiver-drier and air brake dryer

Cab · every 2 years

The manual lists the A/C receiver-drier every 2 years and the air brake dryer reservoir (air-operated trailer brakes) with the longer service. Dealer jobs where the system needs recharging.

Part	Qty	Notes	Part number
Receiver-drier	1	Agriline filter drier 75207 is listed on its T6.165 A/C page; the same Agriline part quotes 82023593 (also 87374420, 87343822) on its T7.235 page. Dealer fits.	82023593
Air brake dryer	1	Fitted tractors only; check your handbook	check your handbook

Step-by-step

Have the receiver-drier changed and the system recharged by an air-conditioning specialist.
Have the air brake dryer renewed if fitted.

Tools: Dealer job

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	FPT NEF 4.5 L 4-cylinder turbo-intercooled diesel, common rail, SCR with AdBlue (TractorData, T6.165)
Engine oil	Check your handbook (grade and spec)	Check your handbook
Coolant	Check your handbook
Valve clearances	Check your handbook
Transmission, rear axle and hydraulics (shared)	Check your handbook	Check your handbook
Front axle differential and hubs	Check your handbook	Check your handbook
Fuel tank	Diesel	≈227 L (New Holland, T6.165)
AdBlue tank	AdBlue (DEF)	≈37 L (New Holland, T6.165)

Specifications


Engine	4.5 L FPT, 4 cylinders; 135 hp rated on the T6.165 (TractorData). Power differs across the range: check your model
Service intervals	600 h engine oil, 1,200 h transmission oil (Stage IV manual)
Tyre pressures	Check your handbook

Known problems

Check which manual edition you have

New Holland's Stage IV T6 manual gives 600 and 1,200 hour services; the 2022-edition manual for the later T6.145 to T6.180 gives 750 and 1,500 hours. Use the one in your cab, or ask your dealer by serial number.

Charge pump filter numbers

Dealer lists show two filter numbers (90433749 and 87588814) for these tractors. Look at the filter on yours before ordering.

Filter numbers may change on later builds

The dealer fitment lists for the filters here mostly end in 2020 to 2021, so tractors built after that may use different numbers. Check your serial number.

Not the T6.140 or earlier

The T6.120 to T6.140 and T6.150 (2012–2016) have their own entry (nh-t6-140). This entry covers the T6.145 and later, and the T6.155 to T6.175.

Fault codes: Suspended front axle codes 10001-10036

Front axle suspension (APH/CCM and MRM types)

Code	Meaning	What to do
10001-10003 / 10009	Lockout, raise or lower solenoid fault	Suspension may lock; drive slowly. Dealer.
10004 / 10005 / 10029 / 10030	Axle position sensor reading too high / too low	Check the sensor and linkage; dealer.
10008 / 10027 / 10028 / 10035	Suspension cannot raise, lower or return to setpoint	Dealer.
10010 / 10011	Chassis accelerometer voltage low / high	Dealer.
10020-10023	Pump/tank, rod, piston or lock-out solenoid circuit fault (MRM)	Dealer.
10024	Front suspension not calibrated	Run the auto-calibration in the handbook, or dealer.
10025 / 10026 / 10031-10034	Rod or piston pressure fails to build or drop, or pressure sensor signal fault (MRM)	Check for oil leaks; dealer.
10036	Axle position dropping: possible hydraulic leak	Look for oil leaks and park the suspension locked; dealer.

Fault codes: Braking, park lock and ABS codes 12011-12999 (Case IH / New Holland)

Electric park lock (EPL) and ABS

Code	Meaning	What to do
12011-12020 / 12163	EPL motor, power stage or temperature fault	Park lock may not work: chock the wheels; dealer.
12024 / 12132-12150	EPL ignition or CAN message errors	Restart; dealer.
12032-12034 / 12172 / 12183-12186	EPL encoder or actuator fault, cable off, or timeout	Chock the wheels; dealer.
12052-12054	Battery out of range for the park lock	Check the battery.
12066 / 12068 / 12215	Trailer relay fault or not configured	Check the trailer connection.
12188	Excess brake pad wear	Have brake pads checked now.
12192 / 12202	Invalid shuttle park status / handbrake switch mismatch	Dealer.
12212-12214	Park lock not calibrated, not initialised or disabled	Dealer.
12500 / 12501	ABS configured but not present / present but not configured	Dealer.
12502-12505 / 12511-12513	Rear axle air sensor or circuit pressure fault	Check for air leaks; don't use on the road if low.
12514-12529	Air-over-hydraulic brake sensor, stroke or pedal-switch faults	Stop road use; dealer.
12600-12607 / 12660-12669 / 12694-12698	ABS controller internal or configuration fault	ABS may be off: dealer.
12608-12639	Wheel speed sensor open, shorted, jumping, air gap, ring damaged or wheel diameter wrong (RL, RR, FL, FR)	Check the sensor plug and ring for mud or damage; ABS may be off.
12640-12659 / 12672 / 12673 / 12712 / 12713	ABS valve, solenoid or pressure sensor fault	Get checked before road use.
12676-12682	ABS supply voltage or ground fault	Check battery and earth straps; dealer.
12684-12692	Low brake system pressure, leakage or uncontrollable valve	Stop; don't drive on the road until the brakes are checked.
12699-12709 / 12999	ABS CAN or trailer (eXBR1) message errors; unknown fault	Dealer.
12701	ABS in factory test mode, not for public roads	Don't use on the road; dealer.

Fault codes: Rear hitch (EDC) codes 1002-1070 (Case IH / New Holland)

Electronic draft control hitch

Code	Meaning	What to do
1002 / 1003 / 1004 / 1049	Radar missing, or wheel/ground speed sensor signal wrong or open	Check the radar face is clean and plugs are tight; slip control may be off.
1006 / 1010 / 1012 / 1021 / 1025 / 1033	A hitch control knob or lever (slip, height limit, drop rate, sensitivity, position, draft) signal fault	Turn the knobs through their range and check plugs; dealer if it persists.
1008 / 1009	Raise/work switch fault, or both fender switches pressed or pressed at key-on	Release the fender switches and restart.
1014-1020	Load-sensing pin signal too low/high, both disconnected, or 8 V reference wrong	Check the pin plugs for corrosion; draft control unreliable until fixed.
1024	Hitch calibration needed	Recalibrate per the handbook, or dealer.
1027 / 1028	Lift arm position sensor voltage low / high	Check the sensor plug; dealer.
1029 / 1031	Hydraulic control valve or chassis harness disconnected	Check the plugs; dealer.
1063-1067	Raise/lower solenoid open or shorted, or valve supply voltage low	Lower the hitch fully with the engine stopped if it sticks; dealer.
1068 / 1070	Height limit not at maximum during calibration / ram configuration not set	Dealer.

Fault codes: Electronic remote valve (EHR) codes 4100-4232 and 4500-4566

Rear (41xx, 42xx) and front (45xx) remote valves

Code	Meaning	What to do
Block +0 (4100, 4114, 4128, 4142, 4156 / 4500, 4514, 4528, 4542)	Remote N: no control signal	Check the lever/joystick plug.
Block +1	Remote N: control signal invalid	Dealer if it repeats.
Block +2	Remote N: memory (EEPROM) fault	Dealer.
Block +3	Remote N in failsafe mode	Stop using that remote; dealer.
Block +4 / +5	Remote N supply voltage low / high	Check battery and charging.
Block +6 / +7	Remote N spool travel below / above range	Dealer.
Block +8	Remote N float position not reached	Dealer.
Block +9	Remote N valve overridden by hand	Release any manual override.
Block +10 / +11	Remote N driver circuit or position sensor fault	Dealer.
Block +12 / +13	Remote N cannot return to neutral, or spool off neutral at start-up	Stop; a stuck-open remote can move an implement. Dealer.
4170, 4173, 4177, 4180	Control 1-4 not calibrated	Recalibrate or dealer.
4190-4193 / 4198 / 4560-4563	Remote N communication lost	Check the valve plug; dealer.
4216-4220	Remote 1-5 spool not calibrated	Dealer.
4232	Rear EHR fender switch engaged at key-on	Release the switch and restart.
4564	EHR joystick: no communication	Check joystick plug.
4565 / 4566	High-flow pump: connection or configuration error	Dealer.

Fault codes: UCM, instrument cluster, steering and A/C codes 13001-16134

Body electrics and cluster

Code	Meaning	What to do
13001-13008	Sensor 5 V or 8.5 V reference voltage low / high	Check the battery, earths and plugs; dealer.
13010-13024	12 V supply line low at UCM output (A, B, D, F1, F3, H, H1, M, R, S1, S2, T1, U1, U2)	Check the fuses for that circuit (same rating); dealer.
14013-14016	Steering angle sensor shorted or open, or 5 V supply wrong	Dealer.
14021 / 14022	Cranking line shorted high or low	Dealer.
14051 / 14052	Fuel level sensor shorted or open	Gauge unreliable; dip the tank.
14061 / 14100	Air brake pressure sensor fault or not configured	Don't rely on the gauge; check brake air before road use.
14091 / 14092	Transmission output speed sensor shorted or open	Dealer.
14095 / 14096	Vane pump shorted or open (CCM-LWB CVT only)	Dealer.
14097 / 14098	Transmission oil pressure sensor shorted or open	Check the oil level; dealer.
14102-14128	A unit is fitted but not configured (steering sensor, climate, park, ABS, radar, TECU, APM...)	Dealer must configure.
14117 / 14119	ABS or radar missing	Check plugs; ABS may be off: dealer.
14300 / 14301 / 14304	Park system frequency mismatch, shorted/open or not validated	Chock wheels; dealer.
14900-14916	Controller missing (transmission, engine, armrest, steering, climate, park, ISOBUS...)	Check plugs and fuses; dealer.
14921 / 14922	Hardware ID not programmed / wrong steering sensor configuration	Dealer.
15002 / 15003	Steering wheel proximity sensor open / shorted	Dealer.
15006-15009 / 15012-15014	Steering split valve or change valve circuit open, shorted or stuck	Steer carefully; dealer.
15010	Steering safety switch failure	Dealer.
15011	Steering engagement time limit reached (5 minutes)	Re-engage; normal timeout.
15024	Steering system not calibrated	Dealer.
16111-16118	A/C cab, outlet, evaporator or outside sensor open or shorted	Comfort only; dealer when convenient.
16120-16122	A/C blower, temperature or mode control broken or shorted	Comfort only.
16125-16134	A/C high- or low-pressure switch shorted, cycling or open	Switch the A/C off; dealer. Don't top up refrigerant yourself.

Fault codes: Tier 4B engine codes 3001-3988 (Case IH / New Holland)

Engine controller (selection of the commonest)

Code	Meaning	What to do
3001-3003 / 3364 / 3365 / 3749	Foot throttle or accelerator pedal sensor fault	Check the pedal plug; dealer.
3005 / 3014 / 3017 / 3026 / 3049	Air filter clogged or sensor fault (3026 severe: engine limited)	Clean or replace the air filter now.
3018	Air cartridge worn, replace soon	Book an air filter change.
3006-3010 / 3172 / 3173 / 3367 / 3443	Coolant temperature sensor fault, or coolant above warning level	Ease the load, idle, check coolant level when cool, clean the radiator.
3028-3032	Engine oil pressure sensor or minimum oil pressure fault	Stop and check the oil level; don't run with low oil pressure.
3033-3036 / 3147 / 3447	Oil temperature sensor fault or oil too hot	Ease the load; check the oil level.
3051 / 3052	Battery voltage too high or low	Check battery and charging.
3059	Main relay stuck	Dealer.
3060-3083 / 3188-3208	Cylinder 1-6 injector circuit short or open	Engine may run rough or lose power; dealer.
3088-3093	Crank or cam speed sensor values implausible / disagree	Dealer; may stall or not start.
3096 / 3097 / 3263 / 3652	CAN bus off (A, B, C)	Restart; dealer.
3102-3112	Rail pressure sensor, valve or metering faults	Change fuel filters if due; dealer.
3118 / 3119 / 3280-3285 / 3811	Internal or sensor supply voltage fault	Check battery; dealer.
3132 / 3425 / 3647	Over-boost or under-boost	Check air filter and hoses for leaks; dealer.
3133-3136 / 3154-3156	Glow lamp or intake heater circuit fault	Cold starting may be poor; dealer.
3146 / 3688	Water-in-fuel sensor or circuit fault	Drain the fuel water trap; use clean fuel.
3157 / 3158 / 3487	Engine anti-tamper check failed	Dealer.
3160-3169	Fan or fuel filter heater circuit fault	Check radiators are clear; dealer.
3177	Overspeed detected by engine protection	Reduce speed or change gear.
3258-3262 / 3403	Starter relay circuit fault	Check battery and connections.
3293-3309 / 3805 / 3915	Rail pressure deviation, too high or too low	Dealer: engine power may be limited.
3361	ECM memory (EEPROM) error	Dealer.
3368-3371 / 3508 / 3581 / 3594 / 3616 / 3656	Torque limited (smoke, protection, injection, DPF, turbo, SCR)	Find the cause (temperatures, DEF, DPF warnings) and call your dealer.
3436	All inducement blocks locked	Dealer: engine restricted until fixed.
3451-3455	Fuel main filter worn, severely clogged, or pre-filter clogged	Change the fuel filter(s) now.
3458 / 3627 / 3909 / 3962	Crankcase pressure high	Check the breather and oil level; dealer.
3450 / 3463 / 3464 / 3614 / 3615 / 3856-3868	eVGT turbo actuator or turbo speed fault	Dealer.
3465-3486	Water pump / coolant pump actuator faults	Watch temperature; dealer.
3509	Fuel tank below critical level	Refuel at once to avoid air in the fuel system.
3511-3515 / 3525-3533 / 3537-3546	SCR / NOx sensor, dosing or catalyst fault	Check DEF level and quality; dealer.
3565 / 3569 / 3574 / 3609 / 3617-3621 / 3930 / 3933	Warning levels 1-10 on SCR/AdBlue (distance/time based)	Refill or fix DEF now; later stages limit power.
3593	Reducing agent (AdBlue) quality too low	Drain and refill with correct AdBlue; dealer.
3597	Reducing agent level warning	Refill AdBlue.
3702	Failed engine start detected	Check fuel and battery.
3726-3730	Fuel-in-oil or soot-in-oil above limit	Stop; check the oil level and smell for fuel; dealer.
3780-3785	Particulate filter engine protection / locked regenerations	Carry out the regeneration as the handbook says; dealer.

Fault codes: PTO, 4WD, diff lock and front PTO codes 5001-8099

PTO and drive-line control

Code	Meaning	What to do
5001-5008 / 5042 / 5043	Rear PTO brake or clutch solenoid open, shorted or stuck; management switch stuck	Switch the PTO off and stop the engine before looking; dealer.
5010-5015 / 5024	PTO shift motor, shift sensor or shift switch fault, or shift not calibrated; PTO fuse input open	Check the PTO fuse (same rating only); dealer.
5027 / 5044	Rear PTO speed sensor open or shorted	Check the plug; dealer.
5033-5037	Cab or fender PTO switch open, shorted or stuck	Clean/check the switch; dealer.
5098 / 5099 / 8099	PTO option not enabled or not configured	Dealer to configure.
6023	Four-wheel-drive solenoid open circuit	Check the plug and fuse; dealer.
7017	Differential lock solenoid circuit open	Check plug and fuse; dealer.
7024 / 7032	Steering angle sensor not calibrated / signal too low	Dealer calibration.
7100-7104	Auto-guidance isolation solenoid or steering angle plausibility fault; guidance message timeout	Steer manually; dealer.
8007 / 8008	Front PTO solenoid stuck on / open circuit	Switch front PTO off; dealer.
8033 / 8037	Front PTO cab switch open / stuck closed	Dealer.

Fault codes: Transmission codes 2001-2601 (Case IH / New Holland)

Transmission controller

Code	Meaning	What to do
2001 / 2308	Shuttle speed too high (N shown) / reverse not permitted	Slow down, select neutral, then re-select.
2005 / 2336 / 2337	Creeper failed to engage or disengage	Dealer if the creeper won't select.
2006	No radar signal	Check the radar sensor face is clean.
2009 / 2010 / 2058	Seat switch voltage low/high or closed	Sit properly; dealer if it persists.
2011 / 2012 / 2037 / 2047 / 2048	Clutch pedal potentiometer or switch fault	Check the pedal moves freely and the plug is tight.
2015 / 2056 / 2057	Range switches both closed or open	Dealer.
2021	Transmission harness disconnected	Check the plug; dealer.
2024-2025, 2091-2097, 2362-2374	Clutch or synchroniser not calibrated	Dealer must calibrate.
2026 / 2027 / 2075-2079 / 2124	Engine or flywheel speed too high / signal missing / sensor fault	Dealer.
2035 / 2036	Dump solenoid shorted or open	Dealer.
2038-2045, 2342-2361	Clutch or range solenoid shorted, open or over-voltage	Dealer solenoid/harness check.
2046	PTO fuse blown	Replace with the same-rating fuse only; if it blows again, dealer.
2049-2055	Output speed or oil temperature sensor open, shorted, or 5 V reference fault	Dealer.
2059 / 2070-2073 / 2110 / 2111 / 2386 / 2387	Shuttle lever or neutral switch fault	Check the lever moves cleanly; dealer.
2061-2068 / 2081-2088 / 2400-2420	Synchroniser potentiometer, solenoid or engagement fault	Don't force shifts; dealer.
2323-2328 / 2538-2547 / 2576-2579	Mid, ring or output speed sensor open, shorted, no signal or air gap critical	Dealer.
2330 / 2385 / 2500	Speed inconsistent with the selected gear, or input overspeed	Select a lower gear.
2331 / 2550 / 2551	Clutch slipping, or stuck dump/clutch solenoid	Stop heavy work; dealer.
2334 / 2335	Forward or reverse clutch pressure present with solenoids off	Dealer: tractor may move unexpectedly.
2501-2506 / 2540-2543	Oil or clutch pressure sensor fault, or pressure not matching command	Check oil level; dealer.
2552-2555	Transmission oil pressure too high, too low or below warning	Stop and check the oil level; don't run with low oil pressure.
2563-2574	Hydro G-port or filter pressure low, high or sensor fault (HST)	Check the oil level and filter; dealer.
2548-2549 / 2580-2583	Brake pressure transducers or pedal switches inconsistent (ABS fitted only)	Brake system fault: get it checked before road work.
2380-2382	Park lock (EPL) position or bus fault (CCM LWB CVT only)	Chock wheels; dealer.
2383 / 2384 / 2390 / 2391	Shuttle park switch fault; hydraulic transmission lube pressure low/high (CCM HD CVT only)	Dealer; low lube pressure can wreck a transmission.
2601	Pressure motor blower fault (MRM only)	Dealer.

Fault codes: T6.145 to T6.180: transmission action codes and fault codes

Transmission controller

Code	Meaning	What to do
P	Parking brake is on: release it to move the tractor	Release the parking brake.
CP	Depress the clutch pedal to enable the transmission (to restore drive)	Press the clutch pedal fully down.
N	Put the shuttle lever in neutral	Move the shuttle lever to neutral, then select a direction again.
2xxx	Any four-digit code starting with 2 is a transmission circuit or sensor fault	The tractor needs your dealer: report the code displayed.

Repair guides

Hard starting or stalling: fuel pre-filter, fuel filter and priming (T5, T6, T7, Puma) (Moderate, 1 hour): Engine cranks but will not start after running dry or a filter change, loses power, or the water-in-fuel light comes on.
Weak or noisy hydraulics, filter warning: the filters and owner checks (T5, T6, T7, Puma) (Moderate, 1–2 hours): Lift slow or weak, remotes slow or noisy, hydraulic filter warning on.
AdBlue warning or reduced power: filters and owner checks (T6, T7, Puma) (Specialist, 30 minutes of checks; repair by a dealer): AdBlue warning, reduced power, SCR fault codes.

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

Parts list with genuine part numbers

New Holland T6.165 Tier 4B (03/15-03/18) parts catalogue, mycnhstore.com GB. Shared T6.120-T6.175 pages; engine internals not listed in this catalogue (engine sold as assembly)

Maintenance filters

Part	Part number	Qty	Notes
Engine oil filter, spin-on 95mm x 171mm M27x2	84228488	1	Every 600 h; Wear part
Engine oil filter, FleetPro	92048690FP	1	Wear part
Fuel filter 96.2mm x 183mm M16x1.5 with water-in-fuel sensor	84278636	1	Page lists T6.120-T6.175: check fit; Wear part
Fuel filter 94mm x 192mm M20x1.5 10 micron	84412164	1	Page lists T6.120-T6.175: check fit; Wear part
Fuel prefilter, cleanable 350 micron	84328598	1	Wear part
Fuel prefilter assembly 40mm x 109mm	84328562	1	Wear part
Fuel prefilter spring	84328599	1	Wear part
Air filter, primary cartridge	82028977	1	Var. 330189/332189 etc. - check fit; Wear part
Air filter, primary cartridge, standard	82034604	1	Page lists T6.120-T6.175: check fit; Wear part
Air filter, primary with pre-cleaner	82034613	1	T6.120 on this page: check fit; Wear part
Air filter, primary 409.5mm	87682990	1	Wear part
Air filter, primary 409.5mm	87704248	1	Wear part
Air filter, secondary cartridge	82028151	1	T6.120 on this page: check fit; Wear part
Air filter, secondary cartridge, standard	82034607	1	Page lists T6.120-T6.175: check fit; Wear part
Hydraulic oil filter, spin-on 136mm x 244mm	84248043	1	Wear part
Hydraulic oil filter, spin-on 97mm x 240mm	84226258	1	Wear part
Hydraulic oil filter 148mm x 268mm 32 micron	47715391	1	Wear part
Hydraulic oil filter 301.5mm 32 micron	87708150	1	Wear part
Brake fluid tank filter	87491693	1	Wear part
Fuel tank screen	84481152	1
DEF/AdBlue tank filter 100 micron	84363730	1	Wear part
DEF in-line filter	84247272	1	Wear part
DEF in-line filter	84367903	1	Wear part
DEF filter DeNOx2	84254852	1	Wear part
Air-con receiver-drier	87343822	1
Cab filter fresh air 380x130x49mm, inner	87726699	1	Wear part
Cab filter fresh air 380x130x49mm	87726695	2	Wear part
Cab filter fresh air 550x100x64mm	87726675	2	Wear part
Cab filter, carbon inner cartridge	87309516	1	Wear part
Engine breather, oil vapour separator	87304662	1	Every 1800 h
Engine breather, oil vapour separator	500315794	1	Every 1800 h
Engine breather, oil vapour separator	2830907	1	Every 1800 h
Transmission breather 20mm x 142mm	47133085	1

Belts, starter and alternator

Part	Part number	Qty	Notes
Main drive V-belt 27.92mm x 1549.4mm 8 rib	J911572	1	Wear part
Air-con compressor belt 14mm x 940mm 4 rib	84344776	1	Wear part
Air brake compressor belt 14mm x 1065mm 4 rib	84536660	1	Wear part
Starter motor 12V 4.2kW	84151331	1
Alternator 12V 120A with pulley	84141452	1
Alternator 14V 150A with pulley	84141453	1

Air cleaner and intake

Part	Part number	Qty	Notes
Air filter housing assembly	84327270	1	Wear part
Intake hose	84426719	1
Intake air hose, large	84479093	1
Intake duct	87522373	1
Air filter 101.5mm x 229mm x 461.5mm	82028148	1	Wear part
Air filter 101.5mm x 229mm x 461.5mm	82028149	1	Wear part

Fuel and DEF

Part	Part number	Qty
Fuel tank	84485845	1
Fuel tank lid	84513193	1
Fuel tank hose	84476616	1
DEF line radiator hose	84479635	1
DEF heater valve	84291579	1

Cooling

Part	Part number	Qty	Notes
Radiator 6 row, air con with ATC	84485111	1
Radiator cap	87306788	1
Coolant expansion tank	82019588	1
Expansion tank filler cap	82022744	1
Radiator hose	84352746	1
Radiator hose 50mm x 329mm	84352747	1
Radiator hose 16mm x 407mm	84419472	1
Radiator hose 16mm x 60mm	84416719	1
Radiator hose 16mm x 532mm	84419768	1
Radiator hose 19mm x 353mm	84490377	1
Radiator 6 row, standard T6.165/T6.175	87737094	1	Read on T6.165 radiator page

Brakes

Part	Part number	Qty	Notes
Rear brake disc	5191497	2	Standard; Wear part
Rear brake disc, extended life	87516774	2	Var. 333166; Wear part
Rear brake piston	5191494	2
Rear brake piston, 113 l/min CCLS with SPS	87354150	2
Rear brake boot	5171793	2
Parking brake disc 126x190x4.5	47127225	4	Wear part
Parking brake pad 3.1mm	5199607	2	Wear part
Parking brake pad 4.2mm	5199788	3	Wear part
Parking brake pad 9mm	47127226	1	Wear part
Parking brake hub 34T	47127223	1
Parking brake spring	5178904	1

Lift and hydraulics

Part	Part number	Qty	Notes
Lift cover assembly	5197898	1
Lift arm RH	47125530	1
Lift arm LH	47125529	1
Rockshaft 46T 520mm	5188863	1
Lift cylinder 80mm, assembly	87306505	2
Lift cylinder 90mm, assembly	87306504	2
Hydraulic filter support	47123333	1	Wear part

Front axle (class 3)

Part	Part number	Qty	Notes
Steering knuckle RH assembly	84196952	1	Var. 330416
Steering knuckle LH assembly	84196849	1	Var. 330416
Ball stud M10	87333763	2
Ball stud 56mm	87361688	1
Spherical bearing 30x64x21	5119699	3
Hub oil seal 165x190x16.5	87309584	2
Hub tapered bearing 95x135x20	5136951	4
Front hub assembly	87529959	2

PTO

Part	Part number	Qty	Notes
PTO main shaft 540/1000 26T/18T	87305531	1
PTO clutch piston	5198547	1
PTO piston ring	5182696	1	Wear part
PTO Belleville washer	5168346	8
PTO clutch plate 99x140x1.7	5163844	6	Wear part
PTO clutch disc 99x152.6x2.2	5173295	6	Wear part
PTO clutch plate 89x152.6x7.5	5198545	1	Wear part
PTO clutch hub Z32	5198672	1
PTO input shaft 780mm, 40 km/h	47135351	1
PTO input shaft 780mm, 40 km/h eco or 50 km/h	47128709	1
PTO brake piston	83999379	1
PTO brake band 23mm	87391136	1	Wear part
PTO brake housing	87518133	1

Sources

Open Farmyard Workshop