This is the Alliant Power AP55555, a common-rail fuel injector remanufactured by Alliant Power. It replaces Cummins 5263310 (also 4944476 and 4934411) and Case IH / New Holland 84347519, and it crosses to new Bosch 0445120237 and Bosch remanufactured 0986435555. Catalogs list this injector for the Cummins QSL 8.9L and the EPA 2004 ISL 8.9L, for Case IH Magnum 275, 305 and 335 and MX275 and MX305 tractors, and for New Holland T8010 through T8050 and TG215 through TG305 tractors. Sold as one injector; the engine takes six. A refundable core applies.

Order this one by number. Catalogs list the same Case IH Magnum and MX and New Holland T8000 and TG tractors with three different injectors: this one (Cummins 5263310, CNH 84347519), Cummins 5263308 (CNH 84346812), which we list as Alliant Power AP55522, new Bosch 0445120236 and 0986435522, and Cummins 5263305 (CNH 87581565), the 8.3L ISC injector. The ISL and QSL engines are listed with both this injector and 5263308. They carry different numbers, so go by the number on the injector you are taking out and not by the tractor or engine model. EPA 2007 and later ISL engines take a Cummins XPI injector, which is a different design again. Hard starting, a rough idle, a miss under load, smoke, low power or a rail pressure fault are the usual reasons these get replaced. Dirt and water in the fuel are what usually kill a common-rail injector, so rule out the fuel filters, the supply side and the connector tubes first, and clean up the fuel before new injectors go in.

Specifications

Fits / Applications

• Cummins QSL 8.9L engines that carry Cummins injector 5263310 (also 4944476 or 4934411)
• Cummins ISL 8.9L on-highway engines of the EPA 2004 generation (Bosch common rail) that carry Cummins injector 5263310
• Case IH Magnum 275, 305 and 335 and MX275 and MX305 tractors and New Holland T8010 to T8050 and TG215 to TG305 tractors, only on engines that carry CNH 84347519. Catalogs list the same tractors with two other injectors, CNH 84346812 and CNH 87581565
• The ISL and QSL are also listed with Cummins 5263308, so match the number on the injector you are replacing
• Six injectors per engine

Fit new seals on each injector and pull the high-pressure connector (feed) tubes: inspect each one and replace any that is worn or marked at the tip. Change the fuel filters and clear out dirty or watered fuel before the first start.

Part Numbers & Cross Reference

Cummins 5263310  ·  Cummins (suffix versions) 5263310NX, 5263310PX, 5263310RX  ·  Cummins 4944476  ·  Cummins 4934411  ·  Case IH / New Holland 84347519  ·  Case IH / New Holland 87708024  ·  Case IH / New Holland 87636630  ·  Case IH / New Holland (remanufactured number) 84347519R  ·  Bosch (new) 0445120237  ·  Bosch (earlier number) 0445120144  ·  Bosch (earlier number) 0445120097  ·  Bosch remanufactured 0986435555

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Will the AP55555 fit my Case IH Magnum or New Holland T8000 tractor?

Only if your old injector reads Cummins 5263310, 4944476 or 4934411, CNH 84347519 or Bosch 0445120237. Catalogs list the Magnum 275, 305 and 335, the MX275 and MX305, the T8010 through T8050 and the TG215 through TG305 with three different injectors: this one, Cummins 5263308 (CNH 84346812) and Cummins 5263305 (CNH 87581565). Call 530-668-0818 with the serial number if you cannot read it.

What numbers does the AP55555 cross to?

Cummins 5263310, 4944476 and 4934411, CNH 84347519, 87708024 and 87636630, new Bosch 0445120237 (earlier 0445120144 and 0445120097) and Bosch remanufactured 0986435555.

How is the AP55555 different from the AP55522?

They are two different injectors for the same engine family. AP55555 replaces Cummins 5263310 and CNH 84347519. AP55522 replaces Cummins 5263308 and CNH 84346812, and it is also the Komatsu PC300 and PC350 injector. Go by the number on the injector you are taking out.

Is the AP55555 new or remanufactured, and is there a core?

It is remanufactured by Alliant Power. A refundable core applies, and it comes back when we receive your old injector in rebuildable condition.

Related Parts

• Cummins ISL & QSL 8.9L, Case IH, New Holland & Komatsu Fuel Injector | Bosch 0445120236 New (Cummins 5263308)
• Cummins ISL & QSL, Case IH, New Holland & Komatsu Injector | Alliant Power AP55522 Remanufactured (5263308)
• Cummins QSL9 8.9L & Komatsu SAA6D114E-5 Common-Rail Fuel Injector | Bosch 0445120305 New (Cummins 5268436)
• Cummins ISC & ISL 8.9L HE300VG Turbo Actuator Kit | Holset 6382091HX Remanufactured
• Common Rail Diesel Injector Testing & Rebuild Service

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.