JCB TM320 / TM420 Agri telescopic wheel loader service schedule

JCB TM telescopic wheel loaders · Tier 4 Final (T4F) machines and the Stage V machines from 2020 on (spec sheet 05/2022). Earlier TM320 Tier 3 machines differ: check your handbook

Every maker's service job for the JCB TM320 / TM420 Agri telescopic wheel loader, counted in hours, with the oils, filters and parts each one needs. Add your telehandler to Farmyard Workshop and it works out what's due from your hours and dates, and keeps the service history.

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Versions: TM320 (130 hp); TM420 (150 hp)

Service intervals

Job	When
Engine oil and filter change	every 500 hours or every 6 months
Fuel lift pump (sediment) element change	every 500 hours or every 6 months
Cab air recirculation filter	every 500 hours or every 6 months
Transmission oil element change (between oil changes)	every 500 hours or every 6 months
Engine fuel filter change	every 1,000 hours or every year
Engine air filter, main element	every 1,000 hours or every year
Hydraulic tank element change (between oil changes)	every 1,000 hours or every year
Crankcase ventilation (breather) element change	every 1,500 hours
Engine air filter, safety element	every 2,000 hours or every 2 years
Coolant drain and refill	every 2,000 hours or every 2 years
Transmission oil and filter change	when needed
Hydraulic oil and return filter change	when needed
Front and rear axle oil change	when needed

Service jobs and parts

Engine oil and filter change

Engine · every 500 hours or every 6 months

JCB's kit chart puts the engine oil filter in every 500-hour kit for the TM320 T4F and TM420 T4F, so oil and filter are changed together every 500 hours. The 6 months comes from JCB's Loadall plan for the same engine, not from a TM handbook: check your handbook.

Part	Qty	Notes	Part number
Engine oil	1	15W-40. JCB Engine Oil EP 15W40 (4001/1805) on the Loadall Agri with the same engine; confirm in your handbook. ≈14 L. Aztec Oils match: EMPROTEC EHPD 15W-40	4001/1805
Engine oil filter	1	Genuine JCB number from JCB's kit chart for the TM320 T4F and TM420 T4F	320/B4420
Sump plug seal	1	Check your handbook	check your handbook

Step-by-step

Park on firm level ground. Fully retract the boom and lower it with the attachment flat on the ground. Parking brake on, engine stopped, key out.
Run the engine briefly so the oil is warm, not scalding, then stop it.
Open the engine cover, remove the sump plug and drain the oil fully.
Clean the filter head, oil the new filter's seal and fit it by hand.
Refit the sump plug with a new seal, to the torque in your handbook.
Fill to between the dipstick marks, run for a minute, check for leaks, stop, wait and recheck.

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

Fuel lift pump (sediment) element change

Fuel · every 500 hours or every 6 months

JCB's kit chart puts the fuel lift pump element in every 500-hour kit for the TM320 T4F and TM420 T4F.

Part	Qty	Notes	Part number
Fuel lift pump (sediment) element	1	Genuine JCB number from JCB's kit chart	320/A7123

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out. No naked flames.
Clean around the element, drain it into a container and remove it.
Fit the new element with its seals.
Prime the system as your handbook describes, start and check for leaks.

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

Cab air recirculation filter

Cab · every 500 hours or every 6 months

JCB's kit chart puts the air recirculation filter 334/V5789 in every kit (500 hours and up) for both machines. The TM420 T4F kits also list a second recirculation filter, 30/926514.

Part	Qty	Notes	Part number
Air recirculation filter	1	Genuine JCB number from JCB's kit chart	334/V5789
Second air recirculation filter (TM420 T4F kits only)	1	Genuine JCB number from JCB's kit chart for the TM420	30/926514

Step-by-step

Stop the engine and take the key out.
Open the filter cover and take out the old filter. Wear a dust mask.
Fit the new filter the right way round and refit the cover.

Tools: Screwdriver, Dust mask

Transmission oil element change (between oil changes)

Transmission · every 500 hours or every 6 months

JCB's kit chart puts the transmission oil element 581/R5206 in every kit, so every 500 hours.

Part	Qty	Notes	Part number
Transmission oil element	1	Genuine JCB number from JCB's kit chart	581/R5206

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Clean round the filter, remove it catching the oil, oil the new seal and fit by hand.
Run the engine at idle, stop it, wait and check the transmission oil level.

Tools: Filter wrench, Drain tray, Rags

Engine fuel filter change

Fuel · every 1,000 hours or every year

JCB's kit chart puts the engine fuel filter in the 1,000-hour and 2,000-hour kits for the TM320 T4F and TM420 T4F. The 12 months comes from JCB's Loadall plan for the same engine: check your handbook.

Part	Qty	Notes	Part number
Engine fuel filter	1	Genuine JCB number from JCB's kit chart	320/A7351

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Clean the filter head, remove the old filter and fit the new one with its seal.
Prime the fuel system as the handbook says, start and check for leaks.

Tools: Filter wrench, Container for fuel, Rags

Engine air filter, main element

Engine · every 1,000 hours or every year

JCB's kit chart puts the main air filter in the 1,000-hour and 2,000-hour kits. The TM320 T4F kit lists 333/D2696 and the TM420 T4F kit lists 400/Y7561. Change it sooner in dusty work.

Part	Qty	Notes	Part number
Main air filter element	1	Genuine JCB number from JCB's kit chart. TM320: 333/D2696. TM420: 400/Y7561. Confirm by serial number	333/D2696

Step-by-step

Stop the engine and take the key out. Never run it with the element out.
Remove the main element, leaving the safety element in place.
Wipe out the housing with a damp cloth. Do not blow dirt into the intake.
Fit the new element, close the housing and squeeze the dust valve clear.

Tools: Torch, Damp cloth

Hydraulic tank element change (between oil changes)

Hydraulics · every 1,000 hours or every year

JCB's kit chart puts the hydraulic tank element 333/F1645 in the 1,000-hour and 2,000-hour kits for both machines.

Part	Qty	Notes	Part number
Hydraulic tank element	1	Genuine JCB number from JCB's kit chart	333/F1645

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Work the controls to release pressure. Clean round the housing and remove the element.
Fit the new element with a new seal, start, check for leaks and check the oil level.

Tools: Spanners, Drain tray, Lint-free rags, Gloves

Crankcase ventilation (breather) element change

Engine · every 1,500 hours

JCB's kit chart puts the crankcase ventilation element in the 1,500-hour and TM420 2,000-hour kits. It is a kit grouping, not a stated handbook interval: check your handbook.

Part	Qty	Notes	Part number
Crankcase ventilation element	1	Genuine JCB number from JCB's kit chart	320/07853

Step-by-step

Stop the engine, take the key out and let the engine cool.
Open the breather housing, remove the old element and fit the new one.
Close it up and check for oil leaks after the next run.

Tools: Rags, Gloves

Engine air filter, safety element

Engine · every 2,000 hours or every 2 years

JCB's kit chart puts the safety air element only in the 2,000-hour kit. The TM320 T4F kit lists 32/925683 and the TM420 T4F kit lists 320/05764.

Part	Qty	Notes	Part number
Safety air element	1	Genuine JCB number from JCB's kit chart. TM320: 32/925683. TM420: 320/05764. Confirm by serial number	32/925683

Step-by-step

Stop the engine and take the key out.
Remove the main element, then the safety element, covering the intake at once.
Fit the new safety element, then the main element, and close the housing.

Tools: Torch, Clean cloth

Coolant drain and refill

Cooling · every 2,000 hours or every 2 years

No TM handbook was read. JCB's Loadall plan for the same engine gives 2,000 hours or 2 years, so that is used here. The coolant quantity was not found: check your handbook.

Part	Qty	Notes	Part number
Coolant	1	JCB Antifreeze HP/Coolant (4006/1120) with water on the Loadall Agri; confirm in your handbook. Quantity: check your handbook	4006/1120

Step-by-step

Only work on a cold engine. Ease the cap off slowly to release pressure.
Drain the system and flush with clean water.
Refill with the correct mix, run to temperature, let it cool and top up.

Tools: Drain tray (30 L), Hose, Coolant tester

Transmission oil and filter change

Transmission · when needed

The transmission oil change interval and grade were not found for the TM320 or TM420: check your handbook. Change the filter element with the oil every time. The element is also changed on its own every 500 hours (next task).

Part	Qty	Notes	Part number
Transmission oil	1	Grade and spec: check your handbook. ≈19 L	check your handbook
Transmission oil element	1	Genuine JCB number from JCB's kit chart	581/R5206

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Let the oil stand until warm, not scalding. Wear gloves.
Drain the transmission, fit a new element with a new seal and refit the plug.
Refill to the level your handbook shows, run the engine briefly, stop, wait and recheck.

Tools: Drain tray (25 L), Spanners, Filter wrench, Funnel, Gloves

Hydraulic oil and return filter change

Hydraulics · when needed

The hydraulic oil change interval and grade were not found for the TM320 or TM420: check your handbook. Change the tank element with the oil every time. The element is also changed on its own every 1,000 hours (next task).

Part	Qty	Notes	Part number
Hydraulic oil	1	Grade and spec: check your handbook. ≈97 L	check your handbook
Hydraulic tank element	1	Genuine JCB number from JCB's kit chart (333/F1645 in both machines' kits; the TM320 T4F 2,000-hour kit also lists 332/B1918)	333/F1645

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Work the controls with the engine off to release trapped pressure. Oil at pressure can pierce skin.
Drain the tank into a container. Stand to one side when you open the drain.
Fit a new element with a new seal and refit the plug.
Fill with the oil your handbook specifies, start the engine, work the hydraulics through their travel, lower everything, stop and recheck the level.

Tools: Container (110 L), Spanners, Filter wrench, Funnel or pump, Gloves

Front and rear axle oil change

Axles · when needed

The axle oil change interval and grade were not found for the TM320 or TM420: check your handbook. The sheet gives 20 L per axle (TM320) or 25 L per axle (TM420), plus 1.3 L in the drop box.

Part	Qty	Notes	Part number
Axle oil	1	Grade and spec: check your handbook. TM320 ≈20 L per axle; TM420 ≈25 L per axle	check your handbook
Drop box oil	1	Check your handbook. ≈1.3 L	check your handbook

Step-by-step

Park on firm level ground, boom retracted and lowered, parking brake on, engine stopped, key out.
Drain each axle and the drop box, refit the plugs and fill to the level plugs.
Check for leaks after the next run.

Tools: Large drain tray, Spanners, Oil pump

Oils, fluids and capacities

System	Oil or spec	Capacity
Engine	JCB EcoMAX (T4F) / 4.8 L DieselMAX (Stage V, 130 hp or 150 hp) 4-cylinder turbo diesel, powershift gearbox
Engine oil	15W-40 (JCB Engine Oil EP 15W40, 4001/1805) as given for the Loadall Agri machines with the same engine family; confirm in your handbook.	≈14 L (JCB TM320/TM420 spec sheet)
Coolant	Check your handbook
Valve clearances	Check your handbook
Engine sump	15W-40 (JCB EP 15W40, as on the Loadall Agri)	≈14 L
Transmission	Check your handbook	≈19 L
Front axle	Check your handbook	≈20 L (TM320), ≈25 L (TM420)
Rear axle	Check your handbook	≈20 L (TM320), ≈25 L (TM420)
Drop box	Check your handbook	≈1.3 L
Hydraulic tank	Check your handbook	≈97 L
Fuel tank	Diesel	≈160 L
DEF (AdBlue) tank	AdBlue (DEF)	≈29 L

Specifications


Engine power (spec sheet, Stage V)	130 hp (97 kW) TM320, 150 hp (112 kW) TM420
Torque (spec sheet)	550 Nm TM320, 600 Nm TM420
Transmission	JCB PS900 powershift, 4 forward / 4 reverse, 33 km/h
Axles	PD70 (TM320), PD87 (TM420), epicyclic hub reduction, oil-immersed brakes
Hydraulic pump	Variable displacement piston pump, 63 cc/rev (TM320), 72 cc/rev (TM420); max flow 140 / 160 L/min
Lift capacity	3,200–4,100 kg across the TM320 / TM420 range (spec sheet)
Wheel nut torque	Check your handbook
Tyre pressures	Check your handbook

Known problems

Different air filters on the two models

JCB's kit chart lists different main and safety air elements for the TM320 T4F and TM420 T4F. Check which kit fits your serial number.

Intervals borrowed from the Loadall

The 500, 1,000, 1,500 and 2,000-hour groupings are JCB's own kit chart. Month figures and the coolant interval come from JCB's Loadall Agri plans and are flagged in each task.

Stage V machines

The capacities are from the 05/2022 Stage V spec sheet. The filter numbers are from the T4F kit chart; the 4.8 L DieselMAX uses the same engine-family filters on the Loadalls, but confirm by serial number.

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.

Repair guides

Hard starting or power loss: water separator (sediment) and engine fuel filter (Moderate, 45 minutes): Engine slow to start, power loss, water in the separator bowl, or a fuel filter service due. Common-rail injectors are easily damaged by dirt and water.
Gearbox or hydraulic filter service and checks (Agri Loadalls and TM telescopic loaders) (Moderate, 1–2 hours): Slow gear engagement, weak hydraulics, hydraulic or transmission filter warning, or the 500/1,000/2,000-hour filter kit is due.
Overheating or low power: air cleaner, radiator, hoses and drive belt (Easy, 45 minutes): Engine running hot, loss of power, black smoke, dust in the intake, or a squealing belt.

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

Sources

Open Farmyard Workshop