Perkins DPF Filters

Perkins T435981 DPF/DOC Assembly

The Perkins T435981 DPF/DOC assembly is a combined diesel oxidation catalyst and particulate filter for the Perkins 904J aftertreatment system. Confirm the engine serial and emissions configuration before ordering.

Part number: T435981
Type: DPF / DOC combined assembly
Engine reference: Perkins 904J-E28T / 904J-E28TA (FL/FM prefixes; confirm serial)

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Availability and delivery terms confirmed with quotation.

What the T435981 Is, and Where It Sits

The T435981 is a combined DPF/DOC assembly: a diesel oxidation catalyst and a diesel particulate filter in one emissions module. The DOC oxidises carbon monoxide and unburned hydrocarbons; the DPF traps particulate matter, which is cleared by regeneration.

It sits in the Clean Emissions Module of the 904J aftertreatment system — downstream of the engine, upstream of any SCR or DEF stage. It is part of the emissions system, not the fuel or oil service path.

T435981 Specifications

We publish only the fields that agree across listings. Dimensions, price and warranty terms are withheld: they belong to the manufacturer’s specification or to a distributor’s offer, not to this page. Those values are confirmed against the manufacturer record for your engine serial and stated in your quotation.

T435981 interface fields and confirmation methods
Check	What listings say	How to confirm
Assembly type	DPF / DOC combined assembly	Confirm the DOC is included
Engine-maker number	Perkins T435981	Check the Perkins parts record
Engine prefixes	FL, FM	Confirm against your serial
Engine series	900 Series / 904 Series	Confirm against your serial
Engine models	904J-E28T, 904J-E28TA	Confirm against your serial
Detailed use	CEM — Clean Emissions Module	Confirm the module configuration
Dimensions, price, warranty	Not published	Confirmed per quotation

Three Records That Have to Agree

Engine build The engine maker, model and full serial or build number. The aftertreatment configuration is build-determined.
Emissions configuration Which module the build carries, and whether it is DPF-only or DOC+DPF.
Complete old part number The complete number on the module being replaced, including any suffix.

Where the manual, the parts record and the module disagree, send all three. Perkins’ own listings warn that multiple versions of these parts are used across engine types. The serial, not the model designation, resolves it.

T435981, T431585 and T436675: Similar Numbers, Different Assemblies

T431585 is the DPF-only assembly in the same category. A DPF traps particulate matter; it does not include the oxidation catalyst. Different emissions configuration, different number — not an alternative to T435981 without a serial check.

T436675 is a second DPF/DOC assembly that Perkins lists against the same 904J-E28T and 904J-E28TA application and the same FL and FM prefixes. Two DPF/DOC numbers for one application is exactly why the serial must be checked: one is likely a build or emissions-stage variation, not a drop-in duplicate.

The trailing digits distinguish assemblies that look alike. Transcribe the full number, including any exchange suffix — an “EXCH” or “-P” marker names an exchange unit, not a new one.

Order the number you can evidence; accept a substitution only when the quotation names it.

Similar numbers are not a fitment statement. Confirm the engine serial, emissions configuration and the number printed on the module being replaced.

T435981 Cross-References Are Candidates, Not Confirmations

Candidate cross-references for T435981, requiring verification
Brand	Candidate reference	Status
Perkins	T431585	DPF-only assembly — candidate only
Perkins	T436675	DPF/DOC assembly — candidate only

Candidate references only. A number that differs from the one on your module is not proof of equivalence.

Applications, and How a T435981 Order Is Quoted

Perkins T435981 applications and ordering

Start with the engine serial, not the model.

Perkins 904J-E28T / 904J-E28TA

Applications are engine-led: Perkins 904J engines in compact construction, agricultural and industrial equipment. The same module family appears on 900 and 904 Series equipment lists; confirm fitment on the machine’s own record and engine serial.

Industrial cross-references also require a check against the machine’s parts record.

Know exactly what is being quoted.

We check each line against the parts record and the emissions configuration, then state the offered assembly, maker, complete number, quantity and delivery terms. A genuine original is quoted only when declared.

No real-time stock feed is published; availability is confirmed against your list.

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Frequently Asked Questions

What is a Perkins T435981 DPF/DOC assembly?

A combined diesel oxidation catalyst and particulate filter for the Perkins 904J aftertreatment system. It is an emissions module, not a routine-service filter element; the correct assembly is confirmed by engine serial.

Is T435981 a DPF or a DOC?

It is both: a combined DPF/DOC assembly. The DOC oxidises carbon monoxide and unburned hydrocarbons; the DPF traps soot. The sibling T431585 is DPF-only.

What is the difference between T435981 and T431585?

T431585 is the DPF-only assembly; T435981 adds the DOC. Different emissions configurations, and they are not interchangeable without a serial check.

Why does Perkins list more than one DPF/DOC number for the 904J?

Multiple versions are used across engine types and emissions stages. The serial and the build list, not the model designation, determine the correct number.

Is a genuine original or an aftermarket assembly available?

A genuine original is quoted when declared before quoting; alternatives are labelled as alternatives. Exchange and remanufactured options are confirmed per quotation.

Confirm the Number, Then Confirm the Build

Send the engine serial or build number, the emissions configuration,
and the number printed on the module being replaced.

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