This is the Alliant Power AP55522, a common-rail fuel injector remanufactured by Alliant Power. It is the remanufactured version of Bosch 0445120236 and replaces Cummins 5263308 (also 4940170, 4939061, 3973060 and 3965721). Catalogs list this injector for the EPA 2004 Cummins ISL 8.9L and the QSL9, for Case IH and New Holland tractors, combines, cotton pickers, sprayers and floaters built on the Cummins 8.3L and 9.0L (6TAA-8304 and 6TAA-9004), and for Komatsu PC300 and PC350 excavators with the SAA6D114E-3. Case IH and New Holland sell it as 84346812, and Komatsu as 6745-11-3102 or 6745-12-3100. Sold as one injector; the engine takes six. A refundable core applies.

We list this injector three ways: as this AP55522, remanufactured by Alliant Power, as 0986435522, Bosch Authorized Remanufactured by Valley Fuel Injection & Turbo, and new as Bosch 0445120236. All three cover the same engines. Match the number before you order, because these engines and machines were built with several injectors that look alike. Catalogs list Case IH Magnum and MX and New Holland T8000 and TG tractors with three of them: this one, Cummins 5263310 (CNH 84347519, our AP55555) and Cummins 5263305 (CNH 87581565), the 8.3L ISC injector. They list Case IH Steiger 280 and 330, STX280 and STX330 and New Holland T9010, T9020, TJ280 and TJ330 tractors with this one and with Cummins 5263306 (CNH 87538123, Bosch 0445120240). The ISL and the QSL9 are listed with both 5263308 and 5263310, the QSL9 and the Komatsu SAA6D114E-5 are also listed with Bosch 0445120305, and EPA 2007 and later ISL engines take a Cummins XPI injector. 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 ISL 8.9L on-highway engines of the EPA 2004 generation (Bosch common rail) that carry Cummins injector 5263308
• Cummins QSL9 8.9L off-highway engines that carry Cummins injector 5263308
• Case IH Axial-Flow combines 2377, 2388, 2577, 2588, 5088, 6088 and 7088 with the common-rail Cummins engine
• Case IH 620 and 625 cotton pickers, Patriot 4420 sprayer, FLX3020 and Titan 3020, 4020 and 4520 floaters
• New Holland CR9040 and CR9060 combines with the common-rail Cummins engine
• Case IH Magnum 215, 245, 275, 305 and 335 and MX215, MX245, MX275 and MX305 tractors and New Holland T8010 to T8050 and TG215 to TG305 tractors, only on engines that carry CNH 84346812. Catalogs list the same tractors with two other injectors, CNH 84347519 and CNH 87581565
• Case IH Steiger 280 and 330 and STX280 and STX330 tractors and New Holland T9010, T9020, TJ280 and TJ330 tractors, only on engines that carry CNH 84346812. Catalogs list the same tractors with CNH 87538123 as well
• Komatsu PC300 and PC350 excavators with the SAA6D114E-3 engine (Komatsu 6745-11-3102 and 6745-12-3100)
• Common-rail engines only, and a model name alone is not enough: match the Cummins, CNH, Komatsu or Bosch 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 5263308  ·  Cummins (suffix versions) 5263308NX, 5263308PX, 5263308RX  ·  Cummins 4940170  ·  Cummins 4939061  ·  Cummins 3973060  ·  Cummins 3965721  ·  Case IH / New Holland 84346812  ·  Case IH / New Holland (remanufactured number) 84346812R  ·  Case IH / New Holland 87538122  ·  Komatsu 6745-11-3102  ·  Komatsu 6745-12-3100  ·  Bosch (new) 0445120236  ·  Bosch (earlier number) 0445120125  ·  Bosch (earlier number) 0445120029  ·  Bosch remanufactured 0986435522

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

Is the AP55522 the same injector as Bosch 0445120236 and 0986435522?

It is Alliant Power’s remanufactured version of that injector. Sellers cross it to new Bosch 0445120236 and Bosch remanufactured 0986435522, and it replaces the same numbers: Cummins 5263308, CNH 84346812 and Komatsu 6745-11-3102 and 6745-12-3100.

Will the AP55522 fit my Case IH Magnum or New Holland T8000 tractor?

Only if your old injector reads Cummins 5263308 or CNH 84346812. Catalogs list the Magnum 215 through 335, the MX215 through MX305, the T8010 through T8050 and the TG215 through TG305 with three different injectors: this one, Cummins 5263310 (CNH 84347519) and Cummins 5263305 (CNH 87581565). Call 530-668-0818 with the tractor and engine serial numbers if you cannot read the number.

Does it fit a Komatsu PC300 or PC350?

Catalogs list this injector for PC300 and PC350 excavators with the SAA6D114E-3 engine, as Komatsu 6745-11-3102 or 6745-12-3100. Dash 10 machines with the SAA6D114E-5 take Komatsu 6746-11-3100, which is Bosch 0445120305. Call 530-668-0818 with the machine serial number.

Is the AP55522 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 QSL & ISL 8.9L, Case IH & New Holland Fuel Injector | Alliant Power AP55555 Remanufactured (5263310)
• 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.