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The QSX is designed to deliver dependable performance without compromise, every hour of every workday. With a unique dual overhead cam design that allows the engineers at Cummins to optimize combustion efficiency.

Available in a range of ratings from 350-635 hp (261-474 kW), the QSX not only meets Tier 2 and Euro Stage II emissions standards, it's advanced design can reach Tier 3 and Stage III requirements as well, with minimal changes. Maintenance has been consolidated so your QSX has less downtime, with extended service intervals. Cummins Advisor makes specifying the right standard features and operating parameters easy every time. And options like REPTO (Rear Engine Power Take-Off) add functionality.

Every QSX engine is covered by Cummins three-step warranty, one of the most comprehensive and simplest plans in te industry.
Engine ModelAdvertised hp (kW) @ rpmPeak hp (kW) @ rpmPeak Torque lb-ft (N•m) @ rpm
QSX 635*635 (474) @ 2100680 (507) @ 19002050 (2780) @ 1400
QSX 600*600 (447) @ 2100660 (492) @ 19002050 (2780) @ 1400
QSX 600*600 (447) @ 1800625 (466) @ 17002050 (2780) @ 1400
QSX 560*560 (418) @ 1800568 (424) @ 17002050 (2780) @ 1400
QSX 540540 (403) @ 2100557 (415) @ 19001730 (2346) @ 1400
QSX 530530 (395) @ 1800530 (395) @ 18001706 (2313) @ 1400
QSX 525525 (391) @ 2100578 (431) @ 18001800 (2441) @ 1400
QSX 510**510 (380) @ 1800531 (396) @ 17001743 (2364) @ 1400
QSX 500500 (373) @ 2100550 (410) @ 18001743 (2364) @ 1400
QSX 475475 (354) @ 2100534 (398) @ 17001743 (2364) @ 1400
QSX 460**460 (343) @ 1800465 (347) @ 16001743 (2364) @ 1400
QSX 450450 (336) @ 2100450 (336) @ 21001690 (2292) @ 1400
QSX 435 435 (324) @ 2100 465 (347) @ 1800 1469 (1992) @ 1400 
QSX 425425 (317) @ 2100468 (349) @ 18001435 (1946) @ 1400
QSX 400400 (298) @ 2100440 (328) @ 18001452 (1969) @ 1400
QSX 380380 (283) @ 2100380 (283) @ 21001163 (1577) @ 1400
QSX 360360 (268) @ 2100396 (295) @ 18001215 (1648) @ 1400
QSX 350350 (261) @ 2100350 (261) @ 21001182 (1603) @ 1400

Additional ratings may be available. Check with your Cummins dealer or distributor.
*Restricted rating.
**Continuous rating.

The high-pressure injection system and electronic controls of the QSX ensure clean, powerful and efficient operation every time. Fuel is injected at pressures of up to 30,000 psi for cleaner, more complete combustion. The intelligence of the electronic control system allows you to use a variety of fuel - even kerosene when diesel fuel isn't available.

Add to that our patented wastegated turbo with excellent response and powerful torque rise.

And everything that makes this a great engine for original equipment also makes it a great engine for repowers.
Specifications.
Advertised Horsepower350-635 hp261-474 kW
Peak Torque1182-2050 lb-ft1603-2779 N•m
Cylinders6
Oil System Capacity48 U.S. qt45.42 liters
Length56.8 in1443 mm
Width40.6 in1032 mm
Height51.1 in1298 mm
Weight (dry)3,200 lb1,451 kg

Cummins QSX has standard features that other diesel engines can't even offer as options.
  • Dual Overhead Cams - The first drives the high-pressure fuel system and the second operates the intake and exhaust valves
  • High-Pressure Fuel System - Up to 30,000 psi for cleaner, more complete combustion
  • Heavy-Duty Rings, Pistons, Bearings - Built to last in excess of 21,000 hours (35% load factor) with high-strength alloys
  • Engine Protection System - Early detection system minimizes potential damage, downtime
  • Advanced Fleetguard® ES Oil and Fuel Filters - 500-hour service intervals
  • REPTO Rear Engine Power Take-Off - Delivers up to 400 hp; available for SAE A, B and C spline types
  • Cummins QuickCheck 5100 - The next generation QuickCheck 5100 combines the power of a portable computer and proprietary engine-monitoring software in one handheld unit. Users can quickly and easily capture engine data, compile summary reports and more - from any diesel engine with standard J1587 or J1939 data links. All in a shop-rugged, weather-resistant case. For information please visit us online at http://quickcheck.cummins.com or see Bulletin 4081707.
  • Water-In-Fuel Sensor - Integrated into the fuel filter, alerts the operator when water-contaminated fuel is present, so preventive measures can be taken before damage occurs
Maintenance Intervals.

Oil drain intervals for the Cummins QSX are set for 625 hours or six months. Filters are vertically mounted for easy access and rapid changing, with no messy spills. Polyvee belts have auto-tensioners, so they never need adjusting. Plus, with the QSX you won't need to adjust the overhead for 3,000 hours.

Dipsticks and oil fills are available from both sides of the engine. And there are three drain ports available, so you never have to worry about having access to maintenance points.

 
For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

The base warranty includes full coverage on every QSX engine and branded components, including electrics such as starters and alternators for unlimited hours during the first year of operation, extending through 2 years or 2,000 hours (whichever comes first). The base warranty also includes 3-year/10,000-hour standard protection on major components. 

Three simple steps explain everything you need to know:

Step One: Full coverage on all Cummins industrial engines and branded components with unlimited hours during the first year of operation. This includes Cummins branded electrics such as alternators, starters, etc.

Step Two: Full coverage is extended for the second year, up to 2,000 hours of operation. Total hours are cumulative from the time the engine goes in service.

Step Three: Major components coverage including block, crankshaft, camshaft and rods on all products for the third year or up to 10,000 hours of operation.

Extended coverage is available with our Encompass Protection Plans with the flexibility to meet the needs of your construction operation.  Cummins Encompass has you covered, around the clock and around the globe. 

For complete warranty details, please see the US and Canadian warranty brochure (3381321) or International warranty brochure (3381322).

 

Getting every installation right - the first time - is as important to Cummins as it is to you. PowerMatch and Advisor help ensure that we get it right, every time.
PowerMatch.

Cummins partners with OEM engineers to test and match the power of the QSX engine to specific equipment models and applications. We use our advanced electronics to shape power curves and ratings to match the jobs your equipment will be doing, taking into account the working environment, load factors, ambient temperatures and operating modes. Then we optimize the engine's performance with other vehicle components, using Advisor.
Advisor.

Advisor software builds a virtual model to make sure every system (air, intake, exhaust, cooling) is integrated for optimum performance. It takes into account everything from load factors to operating climates to duty cycles - then identifies systems or components that could negatively impact reliability - listing alternatives that will deliver the performance you expect the first time - every time.

The QSX lets you set up multiple torque curves that are switchable. You can program an alternate high idle speed, and make it operator controlled.