My Takeaway from Work Truck Week 2026

I flew to Indianapolis to see if I could make sense of the 2027 emissions changes. I wanted to see trucks and discuss the upcoming changes with each manufacturer prior to ordering truck chassis for this year and to see how much, if any, of the needed changes affect mounting bodies for 2027 engines.

For example: exhaust sizes, wiring, or programming features. I was hoping to get some answers.

What I got after spending more than 14 hours on the Work Truck Show expo floor was the same feeling from every single chassis manufacturer:

What We Saw on the Show Floor

The engine manufacturers did have their 2027-compliant powertrains on display. Here’s a look at what was shown:

The Aftertreatment Challenge – 2027 Emissions Changes

The biggest question for our industry; refuse body and roll-off hoist mounting comes down to the aftertreatment systems. The new DOC, DPF, and SCR units with 48V electric heaters are larger and require different packaging on the chassis frame rails.

How the New 48V Aftertreatment System Works

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The Honest Truth – 2027 Emissions Changes

As I sit here on this plane headed home, I ask myself: what did I actually find out on this trip? And why do I feel sick to my stomach? No clear explanation other than everyone trying to sell me on the idea that it’s all under control.

I’m a realist. We know it’s coming, and we know it will not be easy. We can’t pretend it’s all okay.

Next year, if and when the new truck chassis have issues or are delayed or require additional modifications to mount refuse bodies and handle computer programming changes will we be ready? Will we be able to educate our friends, partners, technicians, and the general public with a clearer plan? And in my own business, how do we plan to face these challenges?

I’m sorry to say this is a very difficult task. We have no better idea today than before I landed in Indy on Monday night. I’m writing this to let you know: we are still trying to figure it out. And we will try to keep you informed as we keep pressing forward.

Richard Kemner – RDK Truck Sales

Stay tuned for updates as we learn more about the 2027 emissions transition.

5 Roll-off Truck Maintenance Mistakes That Kill Truck Longevity

And the Simple Habits That Turn Your Truck Into a Workhorse for Years

I’ve been around roll-off trucks since 1983. I’ve ridden routes, crawled under frames, and watched thousands of these trucks come through our shop at RDK. And after four decades in this business, I can tell you that the difference between a roll-off truck that gives you ten solid years of service and one that nickel-and-dimes you to death usually comes down to a handful of Roll-off truck maintenance mistakes that operators make over and over again.

None of these are complicated. None of them require expensive tools or specialized training. They’re the basics – the fundamentals that separate operators who get the most out of their equipment from the ones who are always chasing breakdowns.

Here are the five mistakes I see most often, and what you should be doing instead on your Roll-off truck maintenance.

Mistake #1: Not Keeping Your Hydraulic System Clean and Lubricated

If there’s one system on a roll-off truck that will make or break your longevity, it’s the hydraulics. And the key to hydraulic longevity comes down to three things: clean filters, a functioning tank breather, and keeping the hydraulic fluid clean and in proper condition.

Your hydraulic system is the heart of your roll-off operation. Every time that hoist cycles, every time those cylinders extend and retract, that hydraulic fluid is doing the heavy lifting. When the filters are dirty, contaminated fluid circulates through your pumps, valves, and cylinders. That contamination causes internal scoring, seal degradation, and premature wear on components that cost thousands of dollars to replace.

The tank breather is just as critical and even more commonly ignored. The breather allows air to enter and exit the hydraulic tank as fluid levels change during operation. When that breather is clogged or damaged, moisture and debris get pulled into the tank. Moisture in hydraulic fluid causes corrosion from the inside out and degrades the fluid’s performance. I’ve seen operators spend big money chasing hydraulic problems that traced back to nothing more than a neglected breather.

Beyond the filters and breather, the hydraulic fluid itself needs attention. Changing hydraulic fluid on schedule keeps the entire system clean and properly lubricated. Old, degraded fluid loses its ability to protect internal components, and contamination builds up over time no matter how good your filtration is. A clean hydraulic system runs cooler, responds faster, and lasts dramatically longer than one that’s been neglected.

What you should be doing: Change hydraulic filters at regular manufacturer-recommended intervals – and don’t stretch them. Inspect and replace the tank breather on a scheduled basis, not just when you notice a problem. Change your hydraulic fluid according to the manufacturer’s recommendations to keep the system clean and properly lubricated. Keep spare filters and breathers in your parts inventory so there’s never an excuse to skip a change. Staying on top of these basics prevents the expensive pump, valve, and cylinder repairs that come from running a dirty system.

Mistake #2: Skipping the Grease Schedule – Especially the Side Rollers

This one sounds so basic it almost feels embarrassing to write about. But I’m writing about it because I see it constantly – from one-truck operators all the way up to mid-size fleets. Greasing gets skipped, delayed, or done inconsistently, and the damage is cumulative.

A roll-off truck has dozens of grease points – pivot pins, sheave bearings, hoist pins, tailgate hinges, guide rollers, and side rollers, just to name the obvious ones. Every one of those points is metal-on-metal contact under heavy load and repetitive stress. Without a consistent film of grease, you get accelerated wear, increased friction, heat buildup, and eventually component failure.

I want to call special attention to the side rollers, because this is one of the most misunderstood components on a roll-off truck. A lot of operators think the container rides primarily on the rails. It doesn’t. The roll-off box rides the side rollers more than it rides the rail. Those rollers are what guide the container on and off the truck smoothly and keep it tracking straight. When side rollers aren’t being greased regularly, they seize up. A frozen roller is no longer rolling – it’s just a steel post that the container is grinding against. That creates enormous additional friction and drag on the entire hoist system, and the cable is the component that absorbs all of that extra stress.

Frozen side rollers are one of the leading causes of premature cable wear and cable failure that operators never connect to the root cause. They’re replacing cables and blaming the cable, when the real problem is a seized roller that nobody greased. Side rollers need to be greased on schedule and inspected regularly. When a roller is worn, seized, or damaged, replace it immediately – there’s no excuse for running frozen rollers.

What you should be doing: Establish a written grease schedule and stick to it. Daily is ideal for high-cycle operations. At a minimum, grease all points weekly and document it – and make sure the side rollers are on that list every single time. Spin each roller by hand during your inspection. If it doesn’t spin freely, it needs grease or replacement. Make greasing part of the driver’s pre-trip routine or assign it to a dedicated maintenance person. A grease gun and fifteen minutes of attention is one of the cheapest investments you can make in the life of your truck. A regular grease schedule, done consistently, will turn your roll-off truck into a true workhorse that performs year after year.

Mistake #3: Failing to Retorque Your PTO Mounting Bolts

This is one of the most overlooked maintenance items in the refuse industry, and it applies to every transmission type – Allison automatics, manual transmissions, all of them. Your Power Take-Off is bolted directly to the transmission and it absorbs enormous torsional vibration every time it operates. Those mounting bolts loosen over time. It’s not a question of if – it’s a question of when.

PTOs on refuse trucks take a tremendous amount of torque. Think about what that unit is doing: it’s driving your hydraulic pump, powering the hoist system, and cycling under heavy loads all day long. The torsional vibrations from today’s high-torque, low-RPM diesel engines make this even worse. Those vibrations work on the mounting bolts constantly, and if you’re not retorquing them on a regular basis, you’re setting yourself up for a transmission oil leak – or worse, PTO or transmission damage.

Don’t wait until you see transmission oil on the ground to check your PTO bolts. By the time you see a leak, the bolts have been loose long enough to cause damage to the gasket surface, the PTO housing, or the transmission case itself. That’s a repair bill that dwarfs the cost of a simple retorque.

OEM RECOMMENDATION – Allison Transmission / Chelsea (Parker Hannifin)

Chelsea Technical Bulletin PTO-TEC-137 (Parker Hannifin, Chelsea Products Division) specifically addresses PTO maintenance on Allison World transmissions and states:

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“Monthly: Inspect for possible leaks and tighten all air, hydraulic and mounting hardware, if necessary. Torque all bolts, nuts, etc. to Chelsea specifications.”

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The same bulletin notes that Chelsea engineering increased the mounting bolt torque specification for all 10-bolt series PTOs on Allison transmissions from the previous 30–35 lb-ft to 40–50 lb-ft (54–68 Nm) specifically due to the increasing vibrations in today’s high-torque, low-RPM diesel engines.

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The bulletin further warns: “Due to the normal and sometime severe torsional vibrations that Power Take-Off units experience, operators should follow a set maintenance schedule for inspections. Failure to service loose bolts or Power Take-Off leaks could result in potential auxiliary Power Take-Off or transmission damage.”

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Source: Parker Hannifin, Chelsea Products Division, Technical Bulletin PTO-TEC-137. For complete specifications, visit allisontransmission.com or contact your Allison dealer for the latest service publications. Read the bulletin here

What you should be doing: Retorque your PTO mounting bolts monthly – every 30 days, no exceptions. This applies to all transmissions, but it is especially critical on Allison automatics where the PTO is absorbing significant torsional loads. Use the correct torque specification for your PTO series and check with your PTO manufacturer if you’re unsure of the current spec. While you’re under there, inspect for any signs of oil seepage around the PTO gasket and mounting surface. Also ensure that direct-mount pump splines are properly lubricated with the recommended anti-fretting grease, as torsional vibrations cause fretting corrosion that wears out splines prematurely. This is a fifteen-minute job that can save you thousands in transmission and PTO repairs. Don’t wait to see a transmission oil leak – by then, the damage is already done.

Mistake #4: Neglecting the Reeving Cylinder Sheaves – The #1 Cause of Repeat Cable Failures

Your hoist cable is the single component holding your container in place during loading, transport, and unloading. There is no margin for failure here. A cable that snaps under load is a catastrophic event – it can destroy the container, damage the truck, injure the driver, and put bystanders at risk.

I regularly see operators running cables with visible fraying, kinking, or bird-caging. The mentality is always the same: “It’s still holding, so it’s fine.” That’s not maintenance. That’s gambling.

But here’s what most operators miss, and this is critical: if you’re breaking cables repeatedly, the cable itself is usually not the problem. The real culprit is almost always the sheaves – and the main sheaves on the reeving cylinders are the most commonly neglected components on a roll-off truck. These are the sheaves that carry the most cable load, operate under the highest stress, and cycle the most during every hoist operation. And they are the ones that almost nobody maintains.

When those reeving cylinder sheaves wear down, you’re no longer running cable over a smooth, properly radiused groove. You’re running steel cable over worn, flattened, or grooved steel – steel on steel. That dramatically increases the friction, heat, and stress on the cable every time the hoist cycles. The cable is being abraded and fatigued at an accelerated rate, and no matter how many new cables you put on, they’ll keep failing prematurely until you address the sheave condition.

I’ve seen operators go through cable after cable, spending hundreds of dollars each time on replacement and downtime, when a sheave inspection and replacement would have solved the problem permanently. Worn sheaves don’t just wear out cables faster – they put uneven stress on the cable that causes weak points, fraying, and sudden failure under load. That’s a safety issue, not just a maintenance issue.

What you should be doing: Inspect cables at every pre-trip. Look for fraying, kinking, corrosion, and bird-caging. Replace cables based on manufacturer guidelines and inspection findings – not based on whether they’ve failed yet. But just as importantly, make the reeving cylinder sheaves a priority in your maintenance routine. Inspect them regularly for wear, grooving, flat spots, and proper rotation. If a sheave isn’t spinning freely or the groove profile has worn down, replace it. If you’re going through cables faster than you should be, stop blaming the cable and look at the reeving cylinder sheaves first. That’s where the problem almost always lives. Addressing the root cause saves you money, reduces downtime, and eliminates a serious safety hazard.

Mistake #5: Ignoring Rail Wear Until It’s a Problem

The rails on a roll-off truck take a beating every single day. Containers slide on and off those rails thousands of times over the life of the truck, and every load puts stress on the rail surface and the mounting points. Rail wear is gradual, which is exactly why it gets ignored – until the container starts tracking poorly, loading unevenly, or damaging the frame.

Worn rails don’t just affect the truck. They damage your containers, too. When containers don’t seat properly, you get uneven loading, increased stress on the hoist system, and safety concerns during transport. I’ve seen worn rails cause container damage that cost more to repair than addressing the rail wear would have in the first place.

What you should be doing: Inspect rails visually on a regular basis – look for gouging, uneven wear patterns, and thinning. Measure rail thickness periodically and compare it against manufacturer specs. Plan for rail replacement or buildup before the wear reaches the point where it’s affecting operation. Addressing rail wear proactively is far cheaper than dealing with the cascade of problems it creates when you let it go.

Bonus Mistake: Treating Frame Stress Cracks as Cosmetic

Roll-off trucks work under enormous stress. The combination of heavy loads, repetitive hoist cycling, road vibration, and off-road conditions puts constant strain on the frame and subframe. Stress cracks are inevitable over time – but how you respond to them determines whether they’re a minor Roll-off truck maintenance item or a major structural failure.

Too many operators treat small frame cracks as cosmetic issues. They see a hairline crack and decide to deal with it later. But frame cracks propagate. A small crack today becomes a structural compromise next month. I’ve seen trucks come into our shop with frame damage that started as a simple stress crack that could have been repaired for a few hundred dollars but turned into a multi-thousand-dollar rebuild because it was ignored.What you should be doing: Include frame and subframe inspection in your regular maintenance routine. Look for cracks at high-stress points: hoist mounting areas, rail attachment points, cross-member joints, and anywhere you see paint cracking or rust bubbling. When you find a crack, address it immediately with proper welding repair by a qualified technician. Small repairs now prevent catastrophic failures later.

Why RDK Built a Better Hoist

Every Roll-off truck maintenance issue in this article – from hydraulic system cleanliness, to reeving cylinder sheave access, to cable longevity, to frame stress cracks – informed the design of the RDK-influenced Pac-Mac roll-off hoist. After four decades of watching these problems repeat themselves across every hoist brand on the market, I partnered with Pac-Mac (Hol-Mac Corporation) to start with a blank slate and build the hoist I always wished existed.

The result addresses these exact maintenance challenges by design. Crossmembers are moved back five inches so sheave blocks can be removed without cutting reeving cages or pulling reeving cylinders – because we know those main reeving cylinder sheaves are the most neglected components on a roll-off truck, and if they’re hard to access, they won’t get maintained. The 5-spool integrated valve body reduces hoses, fittings, and leak points. The hydraulic tank is mounted on the gantry assembly, shortening hydraulic lines and keeping the system cleaner. Heavier gauge domestic steel in the main frame means fewer stress cracks over the life of the truck. Every feature on this hoist exists because we saw the problem in the field first.

To read the full story behind the RDK-influenced Pac-Mac hoist design – including the innovations, engineering decisions, and 40+ years of field experience that went into it – see our companion article: “Why the RDK-Style Pac-Mac Roll-off Hoist?” (Coming Soon).

The Common Thread: Discipline Over Dollars

If you look at these mistakes, you’ll notice something: none of them are expensive to prevent. Clean hydraulic fluid, filters, tank breathers, grease, side rollers, PTO retorques, reeving cylinder sheave inspections, and crack repairs – these are all basic, affordable maintenance tasks. The expense comes when you skip them.

A roll-off truck that gets consistent attention to these fundamentals becomes a real workhorse – the kind of truck that runs reliably day after day, year after year, and still has strong resale value when you’re ready to cycle it out of your fleet. The trucks that get neglected become money pits that drain your operating budget and put your business at risk.

At RDK Truck Sales, we’ve built our reputation on the philosophy that “We service what we sell.” That means when you buy a truck from us, you get priority access to our shop, our parts inventory of over $2 million, and our team’s decades of hands-on experience keeping roll-off trucks on the road. But even the best service partner in the world can’t help you if the basics aren’t being done between visits. Take care of the fundamentals. Build the discipline into your operation. Your trucks – and your bottom line – will thank you for it.

Richard Kemner
Founder, RDK Truck Sales
Tampa, FL – Serving the Refuse Industry Since 1997
“We Service What We Sell”

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Disclaimer:

This article is provided for informational purposes only. Maintenance intervals, torque specifications, and procedures may vary by manufacturer, model, and operating conditions. The OEM recommendations referenced in this article are sourced from publicly available technical bulletins and are provided for educational purposes. As with any equipment maintenance decision, we encourage readers to conduct their own due diligence, consult current manufacturer documentation directly, and work with qualified service professionals. Always follow applicable safety regulations and the most current manufacturer guidelines for your specific equipment.

After more than four decades in this industry starting back in 1983 when I was riding routes at 5 AM just to learn the business, I’ve seen plenty of trucks sidelined by cold weather problems that could have been prevented. Hydraulic issues top that list every single winter. This is what 40 years of experience has taught me about cold weather hydraulic maintenance.

Why Cold Weather Hits Hydraulics So Hard

Here’s what I tell every customer who calls in December wondering why their packer is acting sluggish: hydraulic fluid doesn’t like cold any more than you do.

When temperatures drop, that fluid thickens up considerably. I’ve watched operators jump in a truck on a 25-degree morning, fire it up, and immediately start cycling the packer at full speed. That’s asking for trouble. Thick, cold fluid can’t flow through lines and valves the way it needs to. The pump strains to pull fluid that moves like molasses. Pressures spike. Seals that were fine yesterday started weeping because they’re stiff and can’t flex properly.

I learned this lesson the hard way years ago, and I’ve seen the repair bills to prove it, blown hoses, damaged pumps, cylinders that needed rebuilding. All because someone was in a hurry on a cold morning.

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What Actually Works

Give Your Truck Time to Wake Up

I know routes are tight and every minute counts. But five to ten minutes of warm-up, followed by running the packer through a few slow, easy cycles before you head out, saves hours of downtime later. Let that fluid circulate and warm up gradually. Your hydraulic system will thank you.

Check Your Fluid Rating

Not all hydraulic fluid handles cold the same way. If you’re running standard fluid and operating in temperatures that regularly dip below freezing, talk to your parts department about a multi-viscosity fluid designed for wider temperature swings. It’s a simple change that makes a real difference.

Watch Your Seals and Hoses

Cold makes rubber stiff and brittle. That small seep that you’ve been ignoring. It’s about to become a real leak when temperatures drop and that hose or seal can’t flex anymore. Winter is when marginal components fail. Walk around your truck and look, really look, for any signs of fluid where it shouldn’t be.

Listen to Your Equipment

After enough years, you develop an ear for what sounds right and what doesn’t. A pump working too hard has a different tone. Cylinders that are starving for fluid don’t move smoothly. If something sounds off on a cold morning, don’t push it. Let it warm up more or get it checked out.

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The Real Cost of Skipping This

I’ve sold over 8,400 trucks through RDK since 1997, and I’ve had countless conversations with operators about what went wrong. The pattern is always the same: cold snap hits, someone’s running behind, they skip the warm-up, and by noon they’re on the phone needing emergency service.

A blown hydraulic hose on route doesn’t just mean a repair bill. It means a truck sitting on someone’s street leaking fluid. This also means a route that doesn’t get finished and your other trucks and crews are scrambling to cover. One shortcut in the morning turns into a full day’s headache.

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Bottom Line – Cold Weather Hydraulic Maintenance

Treat your hydraulic system with a little extra patience when it’s cold outside. The few minutes you invest in proper warm-up and the attention you pay to fluid condition and component wear will keep your trucks running when you need them most.

That’s not just advice I give, it’s how we’ve operated for nearly 30 years at RDK. Take care of the equipment, and it takes care of you.

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Have questions about cold weather hydraulic maintenance or need parts for your fleet? Contact RDK Truck Sales – we’ve been keeping refuse trucks running since 1997.

Brutal Cold Incoming: Protect Your Fleet This Weekend!

By Richard Kemner, RDK Truck Sales | January 2026 | Cold Weather Fleet Maintenance

If you’re running routes anywhere from the Midwest to the Northeast and Mid-Atlantic
this weekend, you already know what’s coming. We’re looking at temperatures dropping
well below freezing—some areas dipping below zero—with ice storms, snow, and
freezing sleet making things even more challenging.

After 40+ years in this industry, I’ve seen plenty of cold snaps. But today’s trucks and
equipment require a different game plan than they did 20 years ago. Here’s what you
need to know to keep your fleet moving.

The DEF Problem: Your Biggest Cold Weather Enemy
Diesel Exhaust Fluid freezes at 12°F (-11°C). That’s not “below zero” cold—that’s a
regular winter night in half the country this weekend.

What happens when DEF freezes: Your truck goes into derate mode (reduced power).
In severe cases, the engine won’t start at all. The DEF tank and lines can crack if
completely frozen.

What to do: Keep trucks in heated buildings overnight whenever possible. If outdoor
parking is your only option, use DEF tank heaters. Run the engine periodically to keep
the system warm. Never add additives to DEF—it voids warranties and damages the
system. Keep DEF tanks at least half full; less fluid freezes faster.

DPF and Aftertreatment Systems
The Diesel Particulate Filter and SCR systems on modern trucks hate cold weather.
Regen cycles take longer, sensors get sluggish, and the whole system works overtime.

Watch for: Extended regen times tying up trucks. Warning lights from cold sensors
giving false readings. Blocked regens if trucks are doing short runs and shutting down
before completing cycles.

What to do: Let trucks fully complete regen cycles before shutting down—even if it
means idling an extra 20 minutes. Don’t ignore warning lights; cold weather amplifies
small issues into big problems. If a truck has been sitting in extreme cold, let it idle and
warm up before hitting the road.

Hydraulic Systems: Your Packer’s Worst Nightmare
This is where I see crews get into real trouble. Hydraulic fluid thickens dramatically in
cold weather. What flows like water at 70°F moves like honey at 10°F—and barely
moves at all below zero.

The problems you’ll see: Slow or jerky packer operation. Cylinders that won’t fully
extend or retract. Increased strain on pumps (leading to premature failure). Seals that
crack and start leaking.

What to do: Warm up the hydraulic system before running full cycles—operate the
packer slowly through several partial cycles first. Check hydraulic fluid levels; cold
weather reveals low fluid faster. Inspect all hoses and fittings for cracks before heading
out. Consider switching to a lower-viscosity hydraulic fluid for winter operations if you
haven’t already.

Packing Frozen Trash: Physics Works Against You
Here’s something newer operators don’t always think about: frozen garbage doesn’t
compact like regular garbage. When trash is frozen solid, your packer is essentially
trying to crush ice blocks. This puts tremendous strain on the packer, the hydraulics,
and the truck’s PTO system.

What to do: Don’t force it—if the packer is struggling, back off. Expect reduced
payload; frozen material takes up more space. Run more frequent trips rather than
trying to crush frozen loads into one haul. Inspect packer blades and components for
damage after running frozen loads.

Quick Pre-Trip Checklist for Extreme Cold
Before your drivers head out this weekend:

1. Check all fluid levels – engine oil, coolant, hydraulic fluid, DEF
2. Inspect batteries – cold weather kills weak batteries; test them now
3. Look at air dryers and tanks – moisture freezes and locks up brakes
4. Test all lights – shorter days mean more time running in the dark
5. Verify tire pressure – cold drops PSI; check and adjust
6. Confirm heaters work – cab heaters and DEF tank heaters
7. Check wipers and washer fluid – use winter-rated fluid only

The Bottom Line
Modern trucks give us better fuel economy, cleaner emissions, and more power than
ever. But they also demand more attention in extreme weather. The crews that take 30
extra minutes to prep their equipment this weekend are the ones who won’t be stuck on
the side of the road calling for a tow.

Stay safe out there. If you need parts, service support, or just want to talk through what
you’re seeing in the field, give us a call. That’s what we’re here for.
RDK Truck Sales has been serving the refuse industry since 1997. We’re an
independent dealer representing Battle Motors, Pac-Mac, New Way, Labrie, and all
major chassis manufacturers. Sales, service, parts, and leasing—nationwide.

Like our cold weather fleet maintenance blog? Check out some of our other material.

This DPF and DEF system maintenance guide covers best practices, common mistakes, and how to avoid costly repairs.

Brought to you by Richard Kemner | RDK Truck Sales

THE 5 MOST COSTLY MISTAKES

1. Putting diesel fuel in the DEF tank → $8,000 – $15,000 system replacement 2. Using non-dedicated funnels or containers → Permanent catalyst poisoning ($3,000 – $5,000) 3. Using old, heat-damaged, or diluted DEF → Injector failure, crystalline deposits ($1,500 – $3,000) 4. Interrupting DPF regeneration cycles → Excessive soot loading, forced regen, potential DPF damage ($2,000 – $8,000) 5. Ignoring warning lights and fault codes → Small problems become complete system failures

Quick Reference: Do’s and Don’ts

DO THIS	NEVER DO THIS
Use only API-certified DEF	Put any other fluid in DEF tank
Use dedicated blue DEF equipment only	Use funnels/containers that held other fluids
Store DEF in cool location (50-77°F ideal)	Store DEF in direct sunlight or above 86°F
Clean filler area before opening DEF cap	Leave DEF cap off or fill in dusty conditions
Allow DPF regeneration to complete	Shut off engine during active regeneration
Use CK-4 or FA-4 low-ash engine oil	Use high-ash oil (accelerates DPF clogging)
Address warning lights immediately	Ignore fault codes or “wait and see”

Section 1: How to Fill a DEF Tank Properly

⚠ WHAT GOES WRONG: • Cross-contamination: Using equipment that touched fuel or oil introduces contaminants that poison the SCR catalyst permanently • Dirt and debris: Particles enter through dirty fill areas, clogging the DEF filter and pump • Misfueling: Even a small amount of diesel in the DEF tank destroys the entire SCR system

Required: Clean Filling Procedure

1. Clean the area around the DEF cap with a lint-free cloth before opening
2. Use only dedicated DEF equipment (blue funnels, containers, nozzles) – never equipment that held other fluids
3. Verify DEF is API-certified and check the date – don’t use expired product
4. Fill slowly to prevent splashing – do not overfill
5. Replace cap immediately after filling – never leave it open
6. Clean up any spills with water immediately (DEF crystallizes on surfaces)

Equipment Requirements

• Containers: Stainless steel or HDPE plastic only – dedicated to DEF
• Funnels: Blue color-coded, never used for anything else
• Storage: Keep filling equipment covered and clean between uses
• Incompatible materials: Copper, brass, zinc, galvanized metal, aluminum, carbon steel – contact with these contaminates DEF

Section 2: How to Store DEF Properly for to Reduce Degradation

⚠ WHAT GOES WRONG: • Heat degradation: DEF stored above 86°F breaks down, forms crystalline deposits in the injector and catalyst • Wrong concentration: DIY mixing or water dilution causes improper NOx conversion, triggering fault codes and derating • Metal contamination: Trace metals from improper containers permanently poison the catalyst – cannot be reversed

DEF Specification Requirements

Only use DEF that is API-certified and meets ISO 22241 standards:

Parameter	Requirement
Urea Concentration	32.5% ± 0.7% (CRITICAL)
Water Quality	Deionized/demineralized only
Metals (Ca, Fe, Cu, Zn)	< 0.5 ppm total
Phosphates	< 0.5 ppm (trace amounts kill catalyst)

Storage Temperature Impact

Temperature	Shelf Life	Action
50-77°F (10-25°C)	24+ months	IDEAL
77-86°F (25-30°C)	~12 months	Acceptable
86-95°F (30-35°C)	~6 months	Use quickly
Above 95°F (35°C)	Rapid breakdown	DO NOT USE

Storage Best Practices

• Store indoors in a cool, dry, well-ventilated area away from direct sunlight
• Keep containers sealed – ammonia evaporates from exposed DEF
• Practice FIFO (First In, First Out) – mark containers with purchase dates
• Never mix DEF from different suppliers or batches

Section 3: Proper DPF Maintenance Required

⚠ WHAT GOES WRONG: • Interrupted regeneration: Shutting off the engine during active regen prevents soot burnoff, leading to excessive loading and forced parked regen • Excessive idling: Low exhaust temps produce soot but can’t burn it off – rapid DPF loading • Wrong engine oil: High-ash oils leave incombustible deposits that regeneration cannot remove • Ignored warning lights: Continued operation with high soot loading can cause thermal damage to the DPF substrate

Understanding Regeneration

The DPF collects soot and must periodically burn it off. There are three types of regeneration:

Type	When It Happens	What To Do
Passive	Automatically during highway driving (high exhaust temps)	No action needed – happens naturally
Active	ECM injects extra fuel when passive isn’t enough (light may illuminate)	Keep driving until complete – don’t shut off
Parked/Forced	Required when DPF is severely loaded	Must perform immediately to prevent damage

Operational Best Practices

1. Allow regeneration to complete: When the DPF indicator shows active regen, maintain steady driving (if safe) until it finishes
2. Schedule highway time: Vehicles with mostly short-trip, stop-and-go operation need periodic highway driving for passive regen
3. Minimize idle time: Excessive idling produces soot without the heat to burn it off – use APU when stationary
4. Use correct engine oil: CK-4 or FA-4 rated low-ash oils ONLY – high-ash oils clog the DPF with incombustible ash Read this article for more information.
5. Fix engine problems promptly: Oil leaks, bad injectors, turbo issues dump extra soot or oil into the DPF
6. Use ULSD fuel only: High-sulfur fuel damages the DPF and DOC catalyst

Warning Signs of DPF Problems

• DPF warning light or check engine light illuminated
• Reduced engine power or limp mode
• Frequent regeneration attempts
• Increased fuel consumption
• If any of these occur – address immediately to prevent costly damage

Service Intervals

Service	Interval
Back pressure monitoring	Every PM / continuous
DPF inspection	Annually or every 100,000 miles
Professional ash cleaning	150,000 – 300,000 miles (varies by duty cycle)

Section 4: How Small Problems Become Big Repairs

Poor DEF quality and improper DPF maintenance create a cascade of failures. Understanding this chain helps explain why prevention is so important.

Initial Problem	What Fails Next	Final Cost
Contaminated DEF	DEF pump → Injector → SCR catalyst → NOx sensors	$3,000 – $8,000
Fuel in DEF tank	Destroys entire SCR system simultaneously	$8,000 – $15,000+
Heat-degraded DEF	Crystalline deposits → Injector clog → Poor dosing → Catalyst deposits	$1,500 – $5,000
Ignored regen cycles	Excessive soot → Forced regen → Thermal damage to DPF	$2,000 – $8,000
Wrong engine oil	Ash buildup → Reduced DPF capacity → Premature cleaning/replacement	$500 – $3,000

The Bottom Line

PREVENTION COST Quality DEF: ~$3/gallon Dedicated equipment: ~$50 one-time Proper storage: Minimal Training: Time only

FAILURE COST DEF injector: $800 – $1,500 DEF pump: $1,000 – $2,000 SCR catalyst: $2,000 – $5,000 DPF replacement: $3,000 – $8,000 + Downtime

Section 5: Maintenance Checklists

Daily (Driver Responsibility)

• Check DEF level – top off using clean filling procedures
• Monitor dashboard for DPF or DEF warning lights
• Allow regeneration cycles to complete – don’t shut off during active regen
• Report any unusual exhaust smoke or odors

Weekly (Shop/Fleet Manager)

• Verify DEF inventory is properly stored (cool, sealed, in date)
• Inspect DEF filling equipment for cleanliness
• Review any logged fault codes across fleet

Each PM Service

• Check exhaust back pressure readings
• Inspect DEF tank cap and seal condition
• Inspect DEF lines and connections for crystalline deposits
• Check for DEF leaks
• Review and document any stored fault codes
• Verify correct engine oil is being used (CK-4/FA-4)

Annual

• Professional DPF inspection – evaluate cleaning need
• DEF system component inspection
• NOx sensor testing
• Audit DEF storage and handling procedures
• Driver/technician refresher training on proper procedures

REMEMBER: THE 3 KEYS TO SYSTEM LONGEVITY

1. QUALITY DEF – API certified, properly stored, never contaminated 2. CLEAN FILLING – Dedicated equipment, clean procedures, every time 3. COMPLETE REGENERATION – Let the DPF do its job, don’t interrupt

Additional Resources

For more information on DEF and DPF system requirements, refer to these official sources: Thank you for reading our DPF and DEF System Maintenance Guide.

• EPA Diesel Exhaust Fluid Guidelines – Official EPA guidance on DEF systems and regulations
• API Diesel Exhaust Fluid Certification Program – Find API-certified DEF products that meet ISO 22241 standards
• API Engine Oil Categories – CK-4 and FA-4 oil specifications for diesel engines

This DPF and DEF System Maintenance Guide is provided for educational purposes. Always consult your vehicle manufacturer’s specific recommendations.

Questions? Contact RDK Truck Sales – Your Trusted Partner in Refuse Equipment Since 1997

Tampa, Florida | www.rdk.com