Construction Equipment Turbocharger Guide: CAT, Komatsu & John Deere Reference

This Construction Equipment Turbocharger Guide covers the three brands that dominate job sites across North America: Caterpillar, Komatsu, and John Deere. Whether you’re running an excavator, wheel loader, dozer, or backhoe, the turbocharger is the single most stressed component on your diesel, and knowing exactly what’s bolted to your engine saves downtime and money. PT Turbo has been rebuilding and supplying these units since 1978, and this reference is built from what we see cross our benches every week.

We’ll break down turbo families by manufacturer, list common part numbers, explain the difference between wastegated and variable-geometry designs, and show you where reman makes sense over new. Prices and part numbers referenced here are current PT Turbo stock.

How Construction Turbochargers Differ From On-Highway Units

Construction equipment runs hard at sustained high load, often at low road speed with poor cooling airflow. That combination cooks turbos faster than highway trucking does. Heat soak, dust ingestion, and duty cycles near 100 percent are the norm.

Most modern construction diesels in the 4 to 13 liter range use one of two turbo types. Older Tier 2 and Tier 3 engines lean on simple wastegated turbos. Tier 4 Interim and Tier 4 Final engines added variable-geometry turbochargers (VGT) and electronic or pneumatic actuators to manage boost across the rev range while feeding the EGR and DPF systems.

If you want the fundamentals on how these units work, the variable-geometry turbocharger overview is a solid primer. On the equipment side, the actuator is what fails most often, not the cartridge itself.

Caterpillar Turbocharger Reference

Caterpillar builds its own turbos and sources from Garrett and BorgWarner depending on platform. The most common families you’ll encounter on mid-size CAT iron are the C4.4, C6.6, C7, C9, and the heavier C13 and C18.

The C7 and C9 ACERT engines frequently use twin-turbo or series-turbo arrangements. On these, actuator failure on the small high-pressure turbo throws boost codes long before the wheel wears out.

CAT Engine	Typical Application	Turbo Type	Displacement
C4.4	Skid steers, small excavators	Wastegated / VGT	4.4L
C6.6 / C7.1	Backhoes, mid excavators	VGT	6.6 / 7.1L
C9	Wheel loaders, 330-class excavators	Series turbo	8.8L
C13 / C15	Large loaders, off-highway trucks	Twin / series VGT	12.5 / 15.2L
C18	Large dozers, gensets, mining	Twin turbo	18.1L

For a deep dive on the biggest of these, read our Caterpillar C18 turbocharger guide. It covers the twin-turbo layout and generator applications in detail.

Many Garrett-supplied CAT units use pneumatic wastegate actuators that are serviceable separately. The Garrett Pneumatic Actuator 445963-0040 is a common heavy-duty replacement, available from PT Turbo for $465.52. Replacing a failed actuator instead of the whole turbo is often the smart call when the cartridge still spins clean.

Komatsu Turbocharger Reference

Komatsu runs a mix of its own SAA-series engines and Cummins-based powerplants. The SAA6D107 is essentially a Komatsu-badged Cummins QSB6.7, and the SAA6D114 shares DNA with the 6C series. That matters because turbo parts often cross-reference between Komatsu and Cummins catalogs.

Komatsu leans heavily on Holset (BorgWarner) and Mitsubishi turbochargers. The Mitsubishi TD-series units show up on smaller SAA4D and SAA6D engines in excavators like the PC130, PC160, and PC210.

• SAA4D95 / SAA4D107 – Compact excavators and loaders, Mitsubishi TD03/TD04 turbos
• SAA6D107 (QSB6.7) – PC200/PC210 class, Holset HE221W / HE300VG VGT
• SAA6D114 – PC300 class, Holset HX40/HE400VG
• SAA6D125 – Larger dozers and loaders, Holset HX55

On the smaller Mitsubishi TD03 units, the pneumatic actuator is a frequent wear item. The Mitsubishi Turbocharger Pneumatic Actuator TD03 49S3118761 is in stock at PT Turbo for $104.33, and the Mitsubishi Pneumatic Actuator 4918918935 at $83.99 covers other TD04-family applications.

Because the SAA6D107 is a rebadged Cummins, our Cummins QSB turbocharger guide is directly relevant for Komatsu PC200-class owners chasing the right Holset part number.

John Deere Turbocharger Reference

John Deere’s PowerTech line powers a huge slice of the construction and ag market. The 4045 (4.5L) and 6068 (6.8L) are the workhorses, found in everything from 310 backhoes to 200-class excavators and skid steers.

Deere primarily fits Garrett turbochargers, and Tier 4 units use Garrett VNT designs with pneumatic or electronic actuators. The 6068 especially is one of the most common engines we service.

John Deere Engine	Displacement	Common Turbo	Application
PowerTech 4045	4.5L	Garrett GT / VNT	Backhoes, compact loaders
PowerTech 6068	6.8L	Garrett GT2560 / VNT	Excavators, motor graders
PowerTech 6090	9.0L	Garrett series turbo	Large loaders, feller bunchers

For engine-specific detail, our John Deere 6068 turbocharger guide breaks down part numbers across the PowerTech generations.

Deere’s Garrett VNT units use serviceable pneumatic actuators. The Garrett Pneumatic Actuator 757979-5102 is available from PT Turbo for $240.94 and fits a range of these Garrett variable-geometry housings. Match the actuator by turbo part number, not engine model, because Deere ran multiple turbo revisions on the same engine.

Isuzu-powered Deere and CASE machines are also common. If you’re working on that platform, see our Isuzu 4HK1 turbocharger guide.

Symptoms and Diagnosis in This Construction Equipment Turbocharger Guide

Turbo problems on construction iron usually announce themselves through power loss, smoke, and boost codes. Reading the symptom by severity tells you whether you can patch it with an actuator or whether the cartridge is done.

Symptom	Likely Cause	Severity	Typical Fix
Slow boost, low-power derate code	Sticking VGT vanes or failed actuator	Moderate	Actuator or cartridge service
Blue smoke, oil in intake	Worn seals, bearing wear	High	Rebuild or replace
Whine or grinding on spool	Bearing failure, shaft play	Critical	Replace immediately
Overboost fault	Stuck wastegate or bad actuator	Moderate	Replace actuator

Always check shaft play before condemning a turbo. A little in-out axial movement is normal, but any radial play where the wheel touches the housing means the bearings are gone. When the compressor or turbine wheel shows contact damage, dust ingestion is usually the root cause, so inspect the air filter and intake boots before installing a replacement.

Cross-Reference & Superseded Part Numbers

The turbochargers covered in this article match or supersede the following OEM and manufacturer part numbers. If you are searching by part number, these are the units stocked by PT Turbo for this application:

002457  •  004097  •  006396  •  2882109RX-RMN  •  4309355RX-RMN  •  5327347-RMN  •  5459711RX-RMN  •  700177-5015S  •  700177-5017S  •  703457-5002  •  706451-5036S  •  74090-0058  •  740902-0056  •  740902-0057  •  836005-5001S  •  844064-5004S  •  844070-5004S  •  857564-6001  •  870702-6001  •  880736-6001  •  888883-6001  •  888883-6002  •  891185-6001  •  893516-6001  •  896030-5001S  •  951205-5001S  •  CHRA-GT3071RWG-90T-+GT2971R-90T  •  CHRA-GT4202RS  •  CHRA-GT4294R  •  CHRA-GT4508R-COMPACT  •  CHRA-GT4508R-STD  •  CHRA-GTX2860R-GEN1  •  CHRA-GTX3582R-GEN1  •  CHRA-GTX4088R  •  H30-RBL-KIT-UP  •  H45-RBL-KIT-FLL  •  PTT-C30-004  •  PTT-CWH-005  •  PTT-CWH-007  •  PTT-CWH-012  •  PTT-FIE-004  •  PTT-FLS-023  •  PTT-FLS-096  •  PTT-FLS-098  •  PTT-FOC-036  •  PTT-HGC-069  •  PTT-HSG-041  •  PTT-HSG-080  •  PTT-HSG-102  •  PTT-HSG-180  •  PTT-HSG-256  •  PTT-HSG-257  •  PTT-HSG-287  •  PTT-HSG-316  •  PTT-HSG-387  •  PTT-HSG-432  •  PTT-HSG-436  •  PTT-HSG-437  •  PTT-HSG-468  •  PTT-HSG-489  •  PTT-HSG-490  •  PTT-HSG-790  •  PTT-LTS-001  •  PTT-MS3-038  •  PTT-MUS-002  •  PTT-RB2-002  •  PTT-S60-002  •  PTT-SR2-002  •  PTT-STC-008  •  PTT-TBO-060  •  PTT-TBO-106  •  PTT-TBO-325  •  PTT-TBO-490  •  PTT-TBO-612  •  PTT-TBO-770  •  PTT-TBO-795  •  PTT-TBO-877  •  PTT-TBO-879  •  PTT-TBO-979  •  PTT-TBO-B34  •  PTT-TBO-B40  •  PTT-TBO-B41  •  PTT-TBO-C41  •  PTT-TBO-C45  •  PTT-TBO-G52  •  PTT-TBO-H55  •  PTT-TBO-J20  •  PTT-TBO-J22  •  PTT-TBO-J26  •  PTT-TBO-J30  •  PTT-TBO-J31  •  PTT-TBO-J32  •  PTT-TBO-K99  •  PTT-TBO-L16  •  PTT-TBO-L18  •  PTT-TBO-L19  •  PTT-TBO-M26  •  PTT-TBO-M27  •  PTT-TBO-R94  •  PTT-VEVO-026  •  PTT-VEVO-028  •  PTT-VEVO-029  •  PTT-VEVO-158  •  PTT-VEVO-159  •  PTT-VEVO-189  •  PTT-VSRT-007  •  PTT-VVW-004  •  PTT-VVW-042  •  PTT-VVW-047  •  PTT-VVW-173  •  PTT-VVW-214  •  T04-TRB-CRB-SL  •  T3-60-TRM-CMP  •  VA-420081 AS12  •  X15-RBL-KIT-FLL

Can’t find your number above? Contact PT Turbo — our team has been matching part numbers since 1978.