K‑3331 Splitter Valve – Consistent OE‑Equivalent Aftermarket Quality

Our K‑3331 splitter valve is engineered and built to deliver full OE‑equivalent fit and performance. It is a core valve‑body component inside Eaton heavy‑duty transmission. For fleet managers, service technicians and aftermarket distributors, stable split shifting relies on reliable valve‑body replacement and regular transmission valve‑body repair to eliminate unplanned downtime caused by air leaks and shift failures.

This splitter valve is a direct OE‑equivalent replacement for factory Eaton Fuller K‑3331, perfectly compatible with RTLO/RTLOF series gearboxes and delivers leak‑free pneumatic performance under harsh long‑haul working conditions. It is a direct drop‑in part with zero modification needed for heavy duty truck transmission installation.

Key Construction & Technical Specifications

• Material: Impregnated anodized sealed aluminum alloy, anti-corrosion, reduces air leakage, rated for 60 PSI working pressure
• Air Ports: 3 × 1/8-inch NPT inlet, outlet and control ports
• Mounting Standard: 4 × 5/16-inch-18 bolts with 1-7/8-inch length
• Complete Kit Contents: 1 splitter valve assembly, 3 sealing O-rings, 1 air connector fitting
• Production Standard: IATF 16949 certified, stable mass supply for wholesale distribution
• Fitment Advantage: Built as an OE‑equivalent aftermarket replacement part, manufactured to widely‑accepted aftermarket dimensional standards for drop‑in installation without modification. Each unit undergoes strict air‑tightness testing before shipment for reliable field operation.

Multi-Speed Eaton Transmission Compatibility

This splitter valve is compatible with mainstream Eaton Fuller transmission assemblies, covering these heavy‑duty gearbox types:

• 13 speed transmission: The most widely used transmission for daily fleet service
• 10 speed transmission: Super10 RTLO medium haul gearbox series
• 15 speed transmission: Multi-range heavy load medium-duty trucks
• 18 speed transmission: High-tonnage long-haul RTLOF series with the largest market demand

Compatible with Mack, Freightliner, Navistar and all heavy trucks equipped with Eaton Fuller split range transmission systems. It serves as an OE‑equivalent aftermarket replacement part for all above transmission models.

Repair & Replacement Scenarios for Technicians

Repair shops prioritize splitter valve replacement to solve typical transmission faults including stuck split gears, slow shifting and persistent air leakage. Our integrated assembly supports full transmission splitter valve rebuild, no need to source scattered small repair accessories separately.

For fleets with regular maintenance cycles, our heavy duty truck splitter valve replacement kit greatly cuts workshop labor time. Technicians carrying out Eaton Fuller splitter valve repair will find perfect fitment without grinding or altering transmission housing.

If you need one-stop aftermarket transmission parts to finish valve overhaul, our complete valve body kit works as ideal “valve body replacement” solution for all RTLO series vehicles, providing identical function to original factory components.

K‑3331 Splitter Valve – Cross Reference Interchange OEM Part Numbers

Classified as premium OE‑equivalent replacement eaton fuller parts, our K‑3331 splitter valve cross references full industry OEM and aftermarket part numbers that match original Eaton specifications:

Manufacturer	Replacement Part Numbers
Eaton Fuller	4300927, 4304031, 4304032, A-6862, FUL-K3331, FURK3331, K-3329, K-3331, K3331B
World American	A6862, 3088-K-3331
Freightliner	FUL K3331
Navistar	FULK-3331, NSFSK3331
Timken	M13K-3331
Genuine Newstar(S&S)	S-10291, S10291, FUR-K-3331
Mack	3088-K-3331
PAI	900417

The core industry search term k3331 splitter valve corresponds to this assembly, and the phrase Eaton Fuller k3331 splitter valve is used by professional parts buyers to locate this OEM equivalent replacement for original factory Eaton Fuller assemblies. All cross-referenced part models can be fully replaced by our valve without any functional difference.

Matched Pneumatic Control Components for Full Air System Overhaul

To fully optimize eaton air shift transmission performance and finish complete transmission valve body overhaul jobs, we recommend matching this K‑3331 splitter valve with our factory-manufactured control assemblies:

• A‑5000 Slave Valve: Core range shift component fully compatible with all RTLO / RTLOF series transmissions, direct OE‑equivalent replacement for original Eaton Fuller parts
• A‑4740 Air Filter Regulator: Blocks moisture and impurities inside air pipelines to extend valve body service life, meets original OEM quality requirements

Special bundle discount available when purchasing all three transmission control valves together. All matched parts maintain consistent OEM equivalent quality as the K‑3331 splitter valve.

Technical FAQ

Q: Is this component a genuine Eaton Fuller factory part?
A: This is aftermarket replacement hardware engineered to match full OEM functional and dimensional specifications, fully interchangeable with factory K‑3331 splitter valve. All registered trademarks belong to respective original equipment manufacturers.

Q: What is the working pressure for this K‑3331 splitter valve?
A: Designed for 60 PSI working pressure, matching OEM air control specifications for Eaton Fuller heavy‑duty transmissions.

Q: What faults indicate a worn k3331 splitter valve needs replacement?
A: Hard range shifts, missed split gears, constant air leaks and slow gear engagement; full valve body replacement can resolve all common air system defects of Eaton Fuller transmissions, with performance identical to original OEM parts.

Q: Do I need dedicated professional tools for transmission splitter valve rebuild?
A: Standard workshop hand tools are sufficient. All required seals and connecting fittings are included inside our kit, no extra accessories need to be purchased separately. The installation process is consistent with replacing original factory valves.

Q: What transmission series will NOT fit this valve?
A: Not compatible with older RT / RTO‑613, RT/RTO‑6613 gearboxes, please double‑check your transmission model tag before ordering. This valve is only designed as OE‑equivalent replacement for RTLO/RTLOF series transmissions.

Disclaimer: Eaton, Fuller, Mack, Freightliner and other trademarks belong to their respective manufacturers. Our K‑3331 is an aftermarket OE‑equivalent heavy‑duty truck transmission component, intended solely for commercial vehicle repair, and serves as a direct‑fit replacement for original‑factory Eaton Fuller parts.