Heavy Equipment Dealer Reduces Truck Engine Idle Time With Work Truck Solution | MillerWelds

Heavy Equipment Dealer Reduces Truck Engine Idle Time With Work Truck Solution

Print Article
Service truck fleet decreases fuel use and maintenance, saves truck space, and reduces costs with EnPak® all-in-one.

Heavy Equipment Dealer Reduces Truck Engine Idle Time With Work Truck Solution

Butler Case Study

Lower fuel and operation costs

For nearly six decades, Butler Machinery Company has offered equipment sales, service and product support for customers in a variety of industries, including construction, agriculture, demolition and scrap handling, mining, landscaping, power generation and on-highway trucking. With a fleet of approximately 175 service trucks manned by skilled field service technicians, Butler must be prepared with reliable and versatile equipment for the repair, maintenance and service jobs the company is called upon to handle 24 hours a day, seven days a week to keep customers up and running in the field.

In addition, in-shop services offered at many of Butler’s 16 locations across North and South Dakota include engine and transmission rebuilds, hydraulic repair and truck engine service.

Not only is Butler a certified CAT equipment dealer, the company also offers support services. These include fleet machine rental; equipment management software and computer software on topics such as life cycle costing and vehicle simulations; training and safety videos; and customer training seminars.

To meet the wide variety of customer needs while also lowering fuel and operation costs, the third-generation family-owned company decided to convert its truck fleet to EnPak power systems, adding 17 of the machines so far. The fully integrated power system for work trucks provides Butler field service technicians with an air compressor, a hydraulic pump, a generator and optional welding capabilities powered by a fuel-efficient diesel engine integrated with the truck’s fuel supply and battery — all in one convenient, efficient and dependable machine. This solution provides all these jobsite capabilities with the work truck’s engine turned off.

“One of the main things that the guys like is the convenience,” says Dustin Alderin, Butler regional field service adviser. “Everything is right there at the tip of your fingers.”

One machine for many needs

Butler workers like the convenience and ease of the full jobsite functionality offered by the machine. It reduces the need to switch between multiple machines, hooking and unhooking plugs and cables, since it is a combination of the air, power and hydraulic capabilities that Butler employees frequently use in the field. Much of Butler’s service and repair work happens in the field, such as during planting and harvest season and during peak construction periods. It’s also common for technicians to use the unit’s generator to power auxiliary tools or a welder when they get called to repair and maintenance jobs in customers’ shops.

The unit provides a 60-cfm rotary screw compressor with air-on-demand delivery, a 20 gpm hydraulic pump, a 6000-watt generator and a 2400-watt EnVerter™ powered by a 24.8 hp Kubota diesel engine that is compliant with Tier 4 Final regulations to reduce emissions.

“It’s all in the system and that just saves you time,” says Todd Hammer, Butler field service technician. “It’s all right there, and it’s got everything that I need when I’m out working on anything.”

Fuel savings and efficiency

The ability to turn the truck engine off and utilize the machine’s power system reduces fuel usage and truck engine idle time for Butler. The diesel engine uses up to 30% less fuel than a truck’s engine and costs up to 79% less to maintain, according to field testing.

"We've noticed a substantial idle reduction with our Enpak-equipped vehicles," says Kelly Klemisch, fleet manager for Butler. "We like to look at things from a life cycle perspective, and we understand that in two to three years we can return that invesment, that invested capital, and pass that on directly to our customers."

That estimated system payback of two to three years came from a Butler ROI analysis. It looked at fuel and maintenance savings and reduced operating costs.

Along with less truck idle time, several technology advancements also play a role in the maximized fuel savings for Butler. An industry-exclusive load-management system monitors accessory requirements and adjusts the engine’s speed to match demand, delivering only the amount of power required while also allowing the simultaneous operation of the generator, compressor and hydraulics. These features allow technicians to weld on one side of the truck while another worker uses a grinder or an impact wrench on the other side — without any lag in power.

“You can plug in multiple things that run, and get everything out that you need,” Hammer says. “It’s more efficient that way. You don’t have to keep unplugging things, looking for power. It’s right there for you.”

The 6,000-watt generator helps save fuel with EnVerter technology, which delivers up to 2,400 watts of continuous 120 V, 60 Hz, pure sine wave power at low engine speeds. Butler uses the generator to power tools and equipment, including welders, and also lights, laptops and cell phones. This adds to the convenience for workers who may be called to a repair in the middle of the night.

Additionally, auto start/stop technology shuts off the engine when no accessory loads are detected, increasing fuel savings. When Butler workers apply a load, the engine starts quickly, supplying the power necessary to perform the job. Each operator can adjust the auto start/stop time window, anywhere from two minutes to 30 minutes.

Versatility and ease of use

The load sensing and auto start/stop technologies on the machine contribute to ease of operation.

“It’s one less thing they need to worry about when they’re on a job,” Klemisch says. “They don’t need to switch on, switch off a machine. It basically does it on its own.”

Butler workers also notice the enhanced capabilities of the rotary screw air compressor, which can drive a wide variety of tools with high airflow capacity. The air-on-demand delivery system eliminates the lag time common with other air compressor systems. Butler workers can instantly engage the compressor in response to loads and quickly deliver the required air pressure.

“We can get air to the tools faster,” Klemisch says. “We’ve noticed increased air compressor performance, which has really been a benefit to our technicians.”

When using the hydraulic pump, Butler workers get smooth, reliable and precision crane operation. A low-speed lock function enhances control, minimizing hydraulic flow for maximum precision.

“You can change the engine speed, which also will change the speed of the crane,” Hammer says. “It’s very smooth. I like it because you got all the differing speeds you can use, but when you lift heavier stuff, you want to keep it as slow as possible.”

Butler workers power Miller Maxstar® welders off the 6,000-watt generator. These lightweight welders provide superior arc characteristics and are portable enough to move among the company’s trucks and field jobs.

Reduced maintenance and extended chassis life

Idle reduction not only provides fuel savings, it also results in maintenance savings for Butler. The company is able to reduce the frequency of maintenance and lower costs for preventive maintenance.

“The less idling that occurs with that, the lower the maintenance costs and the less issues we experience,” Klemisch says.

That is especially useful with truck engines that are Tier 4 compliant and require the servicing of emissions-control equipment. Some Butler trucks equipped with PTO (power take-off) systems experience emissions issues that can cost from $4,000 to $18,000 to repair.

“In some of those extreme situations, we basically park that truck, sell it as is and purchase another chassis,” Klemisch says.

The EnPak diesel engine does not require diesel exhaust fluid and has no diesel particulate filter to clean or replace, further simplifying maintenance for Butler.

Reducing truck engine idle time by relying on the system for jobsite functions also helps extend the life of the truck drivetrain. This allows Butler to use fleet trucks longer. Using the unit along with a smaller suitcase welder saves Butler about 150 pounds of truck payload, compared to carrying a hydraulic air compressor and an auxiliary welder.

We believe that we can extend our asset life, especially our Class 5 trucks, at least a year or two," Klemisch says. "From a capital investment standpoint, we believe we will save approximately $4,000 a year in asset replacement costs per EnPak in service."

Impact on noise and emissions

In addition to the fuel, maintenance and asset life-cycle savings, the machine improves the working environment for Butler employees. Turning the service truck off instead of running it in idle reduces truck emissions and noise. This results in a more comfortable jobsite.

Also, auto start/stop technology reduces noise and exhaust emissions because the engine only runs when there is a load detected. The specially designed enclosure further reduces sound output.

All-in-one solution saves time and money — at a glance

With a fleet of 175 trucks serving customers in North and South Dakota, Butler Machinery Company must be ready to complete customer repairs, maintenance and support in the field 24 hours a day, seven days a week.

Using PTO systems meant constantly idling the work trucks to power tools on the jobsite. This drove up fuel and maintenance costs for Butler. On trucks with Tier 4-compliant engines, excess idling frequently resulted in issues with the emissions-control equipment. These problems could cost $4,000 to $18,000 per repair, plus the lost profits of a tech waiting on his truck.

Butler converted several trucks to Miller EnPak power systems. These engine-driven solutions deliver air, power and hydraulic capabilities without idling the truck. This allowed the company to lower fuel and maintenance costs while still meeting customer service needs.

  • Butler service technicians frequently use compressed air, generator power and hydraulic capabilities in the field. An all-in-one solution delivers all of this — with the truck engine turned off — for greater convenience and efficiency. Having all of these capabilities in one machine reduced the need for Butler technicians to switch between multiple machines, hooking and unhooking plugs and cables.
  • The company substantially reduced truck idling. The EnPak decreased fuel use and lowered the frequency and cost of maintenance. Less engine idling also helps Butler extend the useful life of its truck fleet.
  • The 60 cfm, rotary-screw air compressor with air-on-demand delivery eliminated the lag time common with other compressed air systems. Technicians always have the air output they need.
  • An industry-exclusive load-management system adjusts EnPak engine speed to match demand. It delivers only the power required while allowing the generator, air compressor and hydraulic pump to run simultaneously. Butler technicians can weld on one side of the truck while another worker uses a grinder or impact wrench on the other side — with no lag in power.


  • Time savings for service techs to complete work
  • Substantial engine idle reduction
  • Decreased maintenance costs by 79% and fuel costs by 30%
  • Extended asset life by at least one year


“It’s all in the system and that just saves you time. It’s got everything that I need when I’m out working on anything.” — Todd Hammer, field service technician for Butler Machinery Company


“We’ve noticed a substantial idle reduction with our EnPak-equipped vehicles. The less idling that occurs with that, the lower the maintenance costs and the less issues we experience. We believe that we can extend our asset life, especially our Class 5 trucks, at least a year or two. We believe we will save approximately $4,000 a year in asset replacement costs per EnPak in service.” ­— Kelly Klemisch, fleet manager for Butler Machinery Company


Read the full case study below or learn more about the EnPak A60 all-in-one-solution.