Genuine Yanmar 129A00-55730 Fuel Water Separator Element Filter – MIU802421

Description

Genuine Yanmar 129A00-55730 Fuel/Water Separator Element

Genuine Yanmar 129A00-55730 pleated fuel-filter element for the primary fuel/water-separator assembly used on select Yanmar tractors, excavators, industrial engines, and Yanmar-powered equipment.

This is the replaceable cartridge located inside the primary fuel pre-filter or water-separator housing. Yanmar identifies 129A00-55730 as the fuel/water-separator element, while John Deere cross-references it as primary fuel filter element MIU802421.

This listing includes one genuine Yanmar 129A00-55730 filter element only.

The large housing O-ring is not included. The correct Yanmar O-ring is 129A00-55740, commonly cross-referenced to John Deere MIU802422. Yanmar catalogs the element and O-ring as separate service parts.

This element should also not be confused with the separate final or secondary spin-on fuel filter used on many of the same engines and machines.

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Product Specifications

• Brand: Yanmar
• Manufacturer part number: 129A00-55730
• Part type: Primary fuel filter / fuel-water separator element
• Filter style: Pleated cartridge element
• Installation location: Primary fuel/water-separator housing
• Fuel type: Diesel
• John Deere cross-reference: MIU802421
• O-ring required where applicable: Yanmar 129A00-55740 / John Deere MIU802422
• O-ring included: No
• Condition: New
• Package quantity: One filter element

Published dimensions for a major equivalent filter are approximately:

• Height: 115.3mm / 4.54 inches
• Outside diameter: 83.3mm / 3.28 inches
• Inside diameter: 19.8mm / 0.78 inch

Dimensions are provided as an additional identification aid. Match the Yanmar part number, OEM cross-reference, engine model, or equipment parts information whenever possible.

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Important: 129A00-55740 O-Ring Is Not Included

The large O-ring sealing the fuel/water-separator housing is a separate service part from the 129A00-55730 filter element.

O-ring references include:

• Yanmar: 129A00-55740
• John Deere: MIU802422

This listing does not include the 129A00-55740 O-ring.

If the existing O-ring is removed during service, inspect it carefully for flattening, cuts, hardening, swelling, cracking, or other damage. Replace the O-ring whenever required by its condition or by the equipment manufacturer’s service procedure.

Do not assume that an aftermarket filter kit containing a large O-ring means the genuine Yanmar filter itself normally includes that seal. Yanmar catalogs the 129A00-55730 element and 129A00-55740 housing O-ring separately.

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What Is Included?

This listing includes:

• One genuine Yanmar 129A00-55730 pleated filter element
• Original Yanmar packaging

Not included:

• 129A00-55740 housing O-ring
• Clear separator bowl
• Filter head or complete housing
• Water-indicator float
• Drain valve or drain plug
• Fuel-line fittings
• Separate final / secondary fuel filter
• Complete maintenance kit

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Primary Fuel Filter / Water Separator Versus Final Fuel Filter

Many modern Yanmar diesel fuel systems use two separate stages of filtration.

1. Primary fuel/water separator: Uses the 129A00-55730 pleated element shown in this listing.
2. Final / secondary fuel filter: Uses a separate filter located farther downstream before the high-pressure injection system.

The exact final-filter number depends on the engine and equipment configuration. For example, Yanmar YT-series tractors using 129A00-55730 may use final fuel-filter numbers such as 129A23-55800 or 129A23-55810, while other Yanmar-powered equipment may use a different final filter.

If the part being replaced is a metal spin-on filter rather than a pleated cartridge located inside a separator bowl, verify the final fuel-filter number instead of ordering 129A00-55730.

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What Does the Fuel/Water Separator Do?

The primary fuel/water separator is the first major filtration stage between the fuel tank and the engine’s high-pressure fuel system.

The 129A00-55730 element helps remove contamination such as:

• Dirt
• Rust
• Tank sediment
• Fine debris
• Contamination introduced during fueling

The surrounding separator assembly also allows water to separate from the diesel fuel and collect in the lower bowl where it can be inspected and drained.

This first stage of filtration helps reduce the amount of contamination reaching the final fuel filter, fuel supply components, high-pressure pump, and injectors.

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Why Water Separation Matters

Water contamination can enter diesel fuel from condensation, storage tanks, fuel cans, bulk tanks, contaminated filling equipment, or poor-quality fuel.

Water in a diesel fuel system can contribute to:

• Corrosion inside fuel-system components
• Rust in tanks and fuel lines
• Microbial contamination
• Premature filter plugging
• Damage to high-pressure fuel-system components
• Hard starting and poor engine operation

The clear bowl used on many applications allows the operator to visually inspect accumulated water and contamination before it reaches more expensive fuel-system components.

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Common Signs of a Restricted Primary Fuel Filter

A dirty or restricted 129A00-55730 element can reduce fuel flow to the engine, particularly when fuel demand increases under load.

Possible symptoms include:

• Hard starting
• Long cranking before the engine starts
• Engine starts and then stalls
• Loss of power under load
• Engine runs normally at idle but struggles at higher RPM
• Surging or uneven engine speed
• Reduced digging, lifting, mowing, or travel performance
• Fuel system repeatedly needs to be primed
• Visible dirt or sediment in the separator bowl
• Visible water collected in the separator

These symptoms can also be caused by a plugged final fuel filter, air entering the fuel system, restricted fuel lines, contaminated fuel, a weak supply pump, blocked tank venting, or another fuel-system problem.

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Yanmar Part Numbers and Search References

• 129A00-55730
• 129A0055730
• 129A00 55730
• Y129A00-55730
• Y129A0055730
• YM129A00-55730
• YM129A0055730
• VV129A0055730
• Yanmar fuel/water separator element
• Yanmar primary fuel filter element
• Yanmar pleated fuel filter

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Common Filter Cross References

Common cross-reference and identification numbers include:

• Yanmar: 129A00-55730
• John Deere: MIU802421
• John Deere: FYD00002532
• Donaldson: P959236
• Fleetguard: FS20363
• WIX: WF10369
• HIFI Filter: SN25127
• SF Filter: SK48584
• Bobcat: 7020012
• Bobcat: 7029012
• CNH / New Holland: 48145964
• Doosan: 240301-0006
• Doosan: 400504-00115
• Doosan: 46843397
• Gehl: 50252550
• Gehl: 50352550
• Hyundai: XJAU01355
• Hyundai: XJAU01515
• Komatsu: YM129A00-55730
• Liebherr: 11692531
• Sany: 60356164
• Takeuchi: 161265
• Takeuchi: Y129A0055730

Cross-reference numbers are supplied for identification purposes. This listing supplies a genuine Yanmar 129A00-55730 element and does not represent the filter as being manufactured or packaged by the other companies listed above.

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Related O-Ring Cross References – Not Included

• Yanmar: 129A00-55740
• John Deere: MIU802422

These references are for the separate housing O-ring and should not be confused with the filter-element part number.

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Common Yanmar Tractor Applications

Yanmar maintenance information specifically identifies 129A00-55730 as the fuel/water-separator element on:

• Yanmar YT235
• Yanmar YT347
• Yanmar YT359

The element is also cataloged for select additional Yanmar tractor configurations, including machines using compatible TNV common-rail engines.

Always verify the complete tractor model and serial number because fuel-system configurations can change during production.

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Common Yanmar Engine Applications

The 129A00-55730 element is used across numerous Yanmar TNV diesel-engine configurations, including select versions of:

• Yanmar 3TNV86CT
• Yanmar 3TNV88C
• Yanmar 4TNV86CT
• Yanmar 4TNV88C
• Yanmar 4TNV94FHT
• Yanmar 4TNV98C
• Yanmar 4TNV98CT
• Additional TNV engine configurations using 129A00-55730

The suffix following a Yanmar engine model can identify important differences in emissions equipment, fuel systems, and equipment-specific configurations. Match the complete engine model whenever possible.

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Yanmar Excavator and Construction Equipment Applications

Cross-reference catalogs identify the 129A00-55730 element as the water-separator or pre-filter element on select Yanmar construction equipment.

Common applications include certain:

• Yanmar ViO50-6 series
• Yanmar ViO57-6A
• Yanmar ViO80-1A
• Yanmar ViO80-series
• Yanmar SV-series excavators using the matching TNV engine and separator assembly
• Additional Yanmar compact construction equipment using the matching filter number

Machine serial-number breaks can affect filter fitment. Verify 129A00-55730 against the old element or machine parts catalog.

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John Deere MIU802421 Applications

Yanmar 129A00-55730 commonly cross-references to John Deere MIU802421, which John Deere identifies as a primary fuel filter element.

John Deere Compact Utility Tractors

• John Deere 3032E – applicable serial-number ranges
• John Deere 3033R
• John Deere 3035D – select configurations
• John Deere 3038E – applicable serial-number ranges
• John Deere 3039R
• John Deere 3046R
• John Deere 4044M
• John Deere 4044R
• John Deere 4052M
• John Deere 4052R
• John Deere 4066M
• John Deere 4066R
• John Deere 4075R – select configurations

3032E and 3038E owners should pay particular attention to serial-number breaks. These models were produced with more than one fuel-filter arrangement.

John Deere Excavators

• John Deere 50G
• John Deere 50P
• John Deere 60G
• John Deere 60P
• John Deere 75G
• John Deere 75P
• John Deere 85G
• John Deere 85P

John Deere Skid Steers and Compact Track Loaders

• John Deere 312GR
• John Deere 314G
• John Deere 316GR
• John Deere 316P – select configurations
• John Deere 317G
• John Deere 317P – select configurations
• John Deere 318E
• John Deere 318G
• John Deere 318P – select configurations
• John Deere 319E
• John Deere 320E
• John Deere 320G
• John Deere 323E
• John Deere 324E
• John Deere 324G
• John Deere 324P – select configurations
• John Deere 325G
• John Deere 326E
• John Deere 326P – select configurations
• John Deere 328E
• John Deere 329E
• John Deere 330G
• John Deere 330P – select configurations
• John Deere 331G
• John Deere 331P – select configurations
• John Deere 332E
• John Deere 332G
• John Deere 333E
• John Deere 333G
• John Deere 333P – select configurations

John Deere Wheel Loaders and Additional Construction Equipment

• John Deere 184G
• John Deere 204G
• John Deere 204L
• John Deere 210G
• John Deere 210L EP
• John Deere 244K
• John Deere 244K-II
• John Deere 244L
• John Deere 244P
• John Deere 304G
• John Deere 304L
• John Deere 310G
• John Deere 310L EP
• John Deere 324K
• John Deere 324L

John Deere Turf and Commercial Mowing Equipment

• John Deere 1570
• John Deere 1575
• John Deere 1580
• John Deere 1585
• John Deere 1600 Turbo Series III
• Select John Deere fairway and rough mowers using MIU802421
• Select John Deere ZTrak diesel mowing equipment using MIU802421

Important: This listing supplies a genuine Yanmar-branded filter in Yanmar packaging. MIU802421 is provided as an interchange and application reference. This product is not packaged or represented as a genuine John Deere filter.

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Case Construction Applications

Cross-reference filter catalogs identify this filter family for select Case excavators equipped with Yanmar common-rail engines, including:

• Case CX57C with Yanmar 4TNV98-series engine
• Case CX60C with Yanmar 4TNV98-series engine

Verify the complete equipment model, serial number, and existing filter before ordering.

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Hyundai Construction Applications

Published applications for this filter family include select:

• Hyundai R55W-9A
• Hyundai R60CR-9A
• Hyundai R80CR-9A

Common Hyundai cross-reference numbers include XJAU01355 and XJAU01515.

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Takeuchi Applications

Published cross-reference applications include:

• Takeuchi TB240 – applicable serial-number ranges
• Takeuchi TB260 – applicable serial-number ranges
• Select additional Takeuchi equipment using 129A00-55730

Common Takeuchi references include 161265 and Y129A0055730.

Takeuchi applications can have important chassis-number breaks, so verify the original filter or equipment parts catalog before ordering.

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Komatsu Applications

The filter is also cross-referenced for select Komatsu compact excavators using compatible Yanmar-based fuel-filter arrangements.

Published applications include:

• Komatsu PC45MR-5
• Select additional PC-series compact excavators using Komatsu reference YM129A00-55730

Always verify the original filter number and machine serial number.

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Additional Equipment Applications

Cross-reference catalogs also associate 129A00-55730 or equivalent filters with select equipment from manufacturers including:

• Bobcat
• CNH / New Holland
• Doosan
• Gehl
• Hyundai
• Komatsu
• Liebherr
• Sany
• Takeuchi

These manufacturers may use several engine and fuel-filter configurations within the same equipment family. Match the old filter, OEM reference, engine model, or equipment parts catalog rather than ordering solely by the machine brand.

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When Should the 129A00-55730 Element Be Replaced?

Follow the maintenance schedule for the specific engine or equipment.

For example, Yanmar’s YT235 maintenance information specifies replacement of the fuel/water-separator element at scheduled 500-hour service intervals, with more frequent inspection and draining of the separator as required.

Replacement may be required sooner when:

• Water contamination is found in the separator bowl
• The fuel is visibly dirty
• Rust or sediment is present
• The machine develops fuel-starvation symptoms
• Contaminated fuel was accidentally added
• The fuel tank has recently been cleaned or repaired
• The equipment has been stored for an extended period
• The filter element is visibly contaminated or damaged

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Inspect the O-Ring During Filter Service

Because the 129A00-55740 housing O-ring is separate from the filter element, it may not automatically be replaced every time the filter is serviced.

Inspect the existing seal for:

• Cuts or tears
• Cracking
• Flattening or permanent compression
• Swelling
• Hardening
• Fuel leakage around the separator bowl

If the seal is damaged or questionable, replace it with the correct O-ring before returning the machine to service.

Again, Yanmar 129A00-55740 / John Deere MIU802422 is not included with this listing.

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How to Confirm the Correct Filter

For the most reliable match, confirm at least one of the following:

• Your old filter or packaging is marked 129A00-55730
• Your Yanmar engine or equipment parts manual specifies 129A00-55730
• Your John Deere parts information specifies MIU802421
• Your existing filter crosses to P959236, FS20363, WF10369, SN25127, or another listed reference
• Your dealer confirms the filter using the complete equipment model and serial number

Also confirm that you need the pleated element inside the primary fuel/water-separator bowl rather than the separate final spin-on fuel filter.

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Installation Notes

• Park the machine safely and allow the engine to cool.
• Clean dirt and debris from around the separator housing before opening it.
• Shut off the fuel supply where the equipment is fitted with a fuel valve.
• Drain accumulated fuel and water into an approved container.
• Remove the separator bowl according to the equipment service procedure.
• Remove and discard the old filter element.
• Clean the inside of the separator bowl without introducing lint or contamination.
• Inspect the 129A00-55740 housing O-ring and replace it if required.
• Install the new 129A00-55730 element in the same orientation as the original.
• Make sure the existing O-ring remains correctly seated during reassembly.
• Do not overtighten a clear plastic separator bowl.
• Open the fuel supply and prime or bleed the low-pressure fuel system as required.
• Start the engine and inspect the separator carefully for fuel leakage.
• Recheck the housing after the engine has operated under load.

Common-rail diesel injection systems contain extremely high pressure on the high-pressure side. Routine filter service should remain confined to the low-pressure fuel system and should be performed according to the equipment manufacturer’s instructions.

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Why Choose a Genuine Yanmar 129A00-55730 Element?

• Genuine Yanmar service part
• Correct 129A00-55730 part number
• Designed for the original Yanmar separator housing
• Correct pleated cartridge configuration
• Used as the primary fuel/water-separator element
• Broad application across Yanmar TNV-powered equipment
• Strong John Deere MIU802421 cross-reference coverage
• Original Yanmar packaging
• Suitable for equipment owners and professional repair shops