This is the Alliant Power AP91010, an electronic actuator for a variable geometry turbocharger, remanufactured by Alliant Power. It fits the Holset HE531VE turbocharger, an HE500 series turbo, on the Paccar MX-13 with EPA10 emissions equipment. The MX-13 is the Paccar engine used in Kenworth and Peterbilt trucks. This actuator takes the place of the one numbered Paccar 1856274, 1975830 or 2411558, which is Holset 4034284. It is the actuator only, not the turbocharger. A refundable core applies.

The actuator moves the variable geometry mechanism in the turbine housing. When it fails, the usual complaints are low or uneven boost, low power and a check engine light with turbo actuator fault codes. A turbo with a stuck or sooted mechanism throws the same codes, so check that the mechanism moves freely before you blame the actuator. EPA13 and later MX-13 engines use a different actuator, so go by the number on your old one.

Specifications

Fits / Applications

• Paccar MX-13, EPA10 emissions, with the Holset HE531VE variable geometry turbocharger
• Takes the place of the actuator numbered Paccar 1856274, 1975830 or 2411558 (Holset 4034284, Holset new kit 6379262H)
• Not for EPA13 or later MX-13 engines, which catalogs list with a different actuator
• Actuator only. Match the number on your old actuator, or call 530-668-0818 with the engine serial number.

A replacement MX-13 turbo actuator typically has to be calibrated (paired) to the turbocharger with diagnostic software when it is fitted, so plan on a shop with Paccar-capable software and follow the Paccar service procedure. Before you bolt it on, make sure the variable geometry mechanism in the turbocharger moves freely through its full travel. An actuator will not fix a turbo that is stuck with soot.

Part Numbers & Cross Reference

Alliant Power AP91010  ·  Paccar 1856274  ·  Paccar 1856274PEX  ·  Paccar 1975830  ·  Paccar 1975830PEX  ·  Paccar 1975830PRX  ·  Paccar 2411558  ·  Paccar 2411558PEX  ·  Paccar 2411558PRX  ·  Holset 4034284  ·  Holset 4034284H  ·  Holset new actuator kit 6379262H  ·  Holset / Cummins 2840930  ·  Holset / Cummins 3787570  ·  Holset / Cummins 3787575  ·  Holset / Cummins 4032845  ·  Holset / Cummins 5322882

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 AP91010 fit my Kenworth or Peterbilt with the Paccar MX-13?

It fits the MX-13 with EPA10 emissions equipment and the Holset HE531VE turbocharger. EPA13 and later engines use a different actuator. Check the number on your old actuator, or call 530-668-0818 with the engine serial number and we will confirm it.

What numbers does the AP91010 take the place of?

Paccar 1856274, 1975830 and 2411558, also written with a PEX suffix, and Holset 4034284. Holset sells the same actuator new as kit 6379262H.

Is the AP91010 new or remanufactured, and is there a core?

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

Does the AP91010 have to be calibrated after it is fitted?

Plan on it. A replacement MX-13 turbo actuator typically has to be calibrated to the turbocharger with diagnostic software, so use a shop with Paccar-capable software. It is the actuator only and does not include the turbocharger.

Related Parts

• Paccar MX-11 & MX-13 EPA17 Turbocharger Electronic Actuator | Alliant Power AP91001 Remanufactured

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.