Maintaining Bucket Trucks Through Winter

What Every Crew Should Know

Bucket trucks are among the most sophisticated pieces of equipment in modern arboriculture, and their safe operation demands far more than basic familiarity. Skilled operators must be thoroughly trained in best practices, manufacturer specifications, and all applicable standards. Equally essential is consistent preventative maintenance and rigorous inspection – critical safeguards that ensure both worker safety and peak equipment performance.

With the critical loads they move and the heights they reach, a seemingly small issue can turn detrimental fast, especially once winter weather rolls in. That’s why staying on top of maintenance and inspections is so important.

This article will guide you through the cruciality of routine checks and maintenance, the standards that matter most, and the practical actions that keep a bucket truck performing safely and smoothly – not just during peak season, but all year long.

Why Regular Maintenance and Inspections Matter

Routine inspections and consistent maintenance are non-negotiable when it comes to bucket truck safety. They play a critical role in preventing accidents and ensuring crews rely on equipment that is safe, dependable, and efficient. These checks matter because they:

• Inspect safety features;
• Verify that the bucket can safely operate;
• Ensure the boom can extend through its full range without issue;
• Identify unusual wear or damage that could lead to a possible component failure;
• Test and maintain the controls on lifting mechanisms to confirm they’re functioning properly;
• And ultimately, keep the bucket truck at optimal performance.

Before extreme or freezing temperatures arrive, it’s important to go ahead and schedule or conduct your maintenance and inspection services ahead of time.

“It’s always a good idea to schedule your maintenance around wintertime,” said John Dean, national account sales manager at Custom Truck One Source. “This makes sure that if there’s a problem, it can be taken care of before everything’s covered in grime, dirt, and frozen sawdust.”

Not to mention, ANSI and OSHA both require regular inspections on specific intervals – and for good reason.

The ANSI Z133 and A92.2 Standards and OSHA Regulations

Bucket truck safety is governed by two industry standards: ANSI Z133 and OSHA. Together, they lay out the requirements for how bucket trucks must be designed, maintained, inspected, and operated to ensure the highest level of safety in the field.

The ANSI Z133 standard specifies several safety requirements for the use of bucket trucks – primarily focusing on fall protection, electrical hazard awareness, annual electrical testing, and safe operating practices. Z133 states that inspections shall be done but doesn’t necessarily explain how – that’s when you turn to A92.2.

The ANSI A92.2 is the primary industry standard for vehicle-mounted elevating and rotating aerial devices. It defines the responsibilities of manufacturers, owners, operators, and employers, and places a heavy emphasis on safe operation, operator training, routine maintenance, and structured inspection schedules, which include:

• Frequent Inspection and Test — Conducted on daily to monthly intervals
• Periodic Inspection or Test — Conducted on one to twelve month intervals
• Major Structural Inspection — Conducted after the first fifteen years of service and then at intervals of every ten years after
• Post Event Inspection or Test — Conducted after any accident or event in which the aerial lift is subjected to excessive loading or stress

These inspections are all aimed at identifying wear, preventing equipment failure, and ensuring the structural integrity of the boom, bucket, and hydraulic systems.

OSHA regulations work alongside ANSI by reinforcing the legal responsibilities of employers and operators. OSHA requires that only trained personnel operate aerial lifts, as outlined in 1910.67(c)(2)(ii). Operators who are properly trained understand inspection procedures, recognize hazards, and know how to identify mechanical or hydraulic issues.

When it comes to aerial lift inspections, OSHA divides them into three categories:

• Pre-start inspections — Conducted at the start of every workday and requires the operator to check both the vehicle and lift components before operation.
• Routine use inspections — These are ongoing checks performed throughout the workday as conditions change.
• Annual inspections — Comprehensive evaluations performed by a qualified mechanic. This professional assesses the vehicle and lift’s structural integrity, hydraulics, electrical systems, and safety features in great detail.

These inspections ensure the bucket truck is closely monitored and fully assessed, providing a safe and efficient worksite for all.

In the wintertime, specifically, the chassis is the key area that operators should focus on in their inspections first, according to Dean.

“This is because the chassis is going to be more susceptible to winter conditions than most of the aerial lifts,” he said. “The chassis needs to be covered first, making sure that the maintenance schedules are up to the manufacturer’s specifications.”

But should a defect be found during an inspection or at any given time, both OSHA and ANSI emphasize that the equipment must be immediately removed from service and repaired by a qualified person. This rule exists to prevent catastrophic failures.

Please note: It’s essential to not only complete the required inspections listed above at the proper intervals, but also to follow all manufacturer-recommended maintenance to keep your aerial lift performing at its best.

Maintenance & Inspections for Bucket Trucks

Proper maintenance and routine inspections are essential to keeping bucket trucks safe, reliable, and compliant with industry standards. Daily, weekly, and annual inspections help operators identify wear, prevent breakdowns, and extend the life of the equipment.

Of course, as crucial as these daily, weekly, and annual maintenance tasks are in the wintertime, they should be implemented year-round to ensure optimal performance and safety.

Daily Bucket Truck Inspections

According to both ANSI and OSHA, bucket trucks should be inspected daily – before operation and periodically throughout the workday. These routine checks keep the equipment in good working condition. Daily inspections not only catch minor issues early, but they also identify problems that could escalate into major failures if left unaddressed.

“Daily inspections aren’t just busywork – they’re how you catch the small things before they turn into the big things,” Craig Moses, director of sales for Arbortech, said. “When you’re working at height, even a minor issue can become a major hazard, quickly.”

General and Exterior Checks

A thorough daily walk-around of the truck’s exterior is the first step to ensuring a bucket truck is safe and job-ready. When conducting the general exterior inspection, look for anything that is out of the ordinary. The truck body should be free from any visible damage, dents, or deformation, and the glass and mirrors should be intact with no cracks.

Open and close all doors and windows to ensure they function smoothly. And take a moment to scan the hydraulic cylinders and hoses – any fraying, bulging, or leaking indicates that they need immediate attention.

The exterior of the vehicle should also be free from corrosion, and all nuts and bolts – especially those securing core components – must be tight and accounted for. Check every tire, including the spare, to confirm they are inflated and in good condition. Look underneath the truck for any visible leaks, and then move to the boom.

The boom should show no signs of rust, deformation, or damage. Inspect the boom rest or cradle, along with all pins, rings, and bolts, to ensure everything is secure.

Next, check the bucket. Confirm the mounting is solid, the liner is intact, and the door latch opens and closes as it should. Outriggers, outrigger pads, and tie-off points should also be inspected for wear and structural integrity.

Lastly, take a moment to verify that all required decals – such as safety labels, warnings, operating instructions, etc. – are legible and in place, and that the operator’s manual is stored in the truck.

General & Exterior Winter Inspection Tips

Eric Lumberg, product safety manager at Altec, explained that as temperatures drop in the winter, his company recommends keeping steps and walkways clear of ice and snow. This precaution also follows the regular project manager (PM) checklist found in Altec’s maintenance manual.

Just as importantly, if there’s ice present on the aerial lift, it could cause a hazard as the operator drives down the road.

“It’s no different than when you see big sheets of ice fly off the top of a car,” said Dean. “The same thing hides inside the aerial lift, on top of the booms, and all the components – all that water sits there and freezes.”

One way to avoid these kinds of accidents is by using bucket covers to keep water from weighing down and freezing inside the bucket.

“Once it gets weighed down, that water accumulates and freezes,” he said. “It can turn into a giant block of ice, and as the truck goes down the road, the wind can get underneath it and lift it up.”

At a minimum, Dean recommended cleaning off bucket trucks and large equipment before driving or operating them to prevent unwanted hazards on and off the road.

Fluids Checks

The next step is to pop the hood and check all fluid levels. Brake fluid should be topped off and clean, and engine coolant must be at the proper level.

“Coolant is a very important part of the truck,” Dean said. “It makes sure that the engine stays cool and doesn’t freeze up in the engine.”

Next, move onto the hydraulic fluid, confirming it’s within the manufacturer’s recommended range. Take a quick look for any fuel leaks and check to ensure there’s enough fuel for the day.

Bucket Truck Fluids During Wintertime Operation

When it comes to preparing bucket trucks for winter, Lumberg said oil is the key area that operators should focus on first:

“Altec recommends warming up the oil when temperatures are below 32 degrees Fahrenheit.”

It’s important to refer to the manufacturer’s recommendations, as some may request a different viscosity, or thickness, of oil for wintertime operation.

“It’ll run smoother,” Dean said. “In cold weather, diesel fuel will actually turn into a gel if it gets cold enough. The same thing goes for oil – it takes longer to heat it up until it becomes thin enough to be effective.”

In northern regions that see more extreme temperatures in the winter, it’s also recommended to check that the block heater is functional. Block heaters plug in directly to the truck using a 110-volt outlet, ensuring the engine block is warm and the diesel fuel stays fluid.

“If it does gel up, it doesn’t flow well, and sometimes the truck just will not start,” he said. “If the truck is equipped with a block heater, you’ll be sure it actually functions and works.”

Dean compared plugging a truck into a block heater to plugging in an electric vehicle.

“It’s a funny comparison, but it’s almost like driving an EV,” he stated. “When you get home in the afternoon, you plug it in. It’s practically the same thing – in the winter, you’ll want to plug the truck in every single night to make sure that it’s not super cold and the diesel fuel doesn’t gel up. This is considered a pre-maintenance task.”

Pre-Operational Checks

After the exterior and fluids pass inspection, move into the cab and perform pre-operational system checks. The following should be in good working order:

• Brakes
• Steering wheel
• Horn
• Turn signals
• Wipers
• Lights – headlights, tail lights, brake lights, flashers
• All controls
• Battery
• Seat belt
• Backup alarm

Safety & Emergency Equipment

Finally, inspect and confirm that all required safety and emergency equipment is stocked, accessible, and in good working order. This includes:

• First aid kit
• Fire extinguisher
• Traffic cones
• Warning signs and flags
• Tools and equipment
• Personal protective equipment (PPE)
• Outrigger pads and/or mats
• Wheel chocks

DOT & FMCSA Required Safety Equipment for Commercial Trucks

It’s also important to note that the Department of Transportation (DOT) and Federal Motor Carrier Safety Administration (FMCSA) require commercial trucks to be stocked with specific emergency and safety gear. This includes fire extinguishers, reflective warning devices, and spare fuses. In some cases, first aid kits and other safety-related items, like high-visibility vests, are required.

These regulations generally apply to Commercial Motor Vehicles over 10,000 lbs gross vehicle weight rating (GVWR), buses, and any vehicle transporting placarded hazardous materials.

In addition to carrying the proper equipment, drivers must complete a daily DOT inspection. Under 49 CFR 396.13, this involves checking all critical safety components and documenting any defects on a Driver Vehicle Inspection Report (DVIR) – a mandated paper form that must be completed every day. Drivers must inspect brakes, tires, lights, steering, suspension, coupling, fluid levels, and the emergency equipment itself.

Weekly Bucket Truck Maintenance & Inspections

Weekly inspections are a bit more detailed. These are more thorough assessments that check the bucket truck’s performance after it has been used for a week of work.

Dean emphasized that it’s important to stay consistent with scheduled inspections and maintenance, even in challenging weather conditions.“Sometimes maintenance is overlooked, especially if the truck is parked outside, because nobody wants to be outside in the snow or cold, rain or wind,” he said. “It’s important to keep up with the maintenance and inspections even when it’s cold outside.”

A key focus during weekly inspections is the hydraulic system, electrical components, and chip body. Dean noted that in winter, operators should be aware that the lift may operate more slowly at first, but checking fluid levels remains important.

“Be aware that the lift might run slower in the wintertime, but you still want to make sure you have enough fluid in there to begin with,” he said.

While tank heaters are available for extremely cold climates – like North Dakota, Minnesota, Wisconsin, or northern Michigan – they are generally not required.

“It’ll be real slow to begin with until the frictional oil moving through the machine warms it back up – but it’ll work,” Dean explained.

Winter road conditions introduce additional hazards. Salt, sand, and other abrasives can accumulate in bearings, pivot points, and other components of the aerial lift. Dean advised for bucket trucks to be kept on regularly scheduled maintenance.

“You put grease in, it pushes out the old. That will help push out any of the abrasives, salt, or chemicals put on the road that can get in the aerial lift.”

To prevent rust, corrosion, and paint damage during winter, Moses said to wash the truck every now and then.

“Tree guys are often very tough on their trucks and they tend to let them go,” he stated. “A good washing or spray down every now and then helps clean off the tree acid and cleans off any of the grime and grit from the road that may affect the operations or get into the paint.”

Annual Inspections

Annual bucket truck inspections are comprehensive evaluations that are only performed by an authorized mechanic who is OSHA- and ANSI-certified. These inspections typically cover the hydraulic system, electrical components, structural integrity, and all safety and restraint devices.

For insulated units, this also includes the OSHA 1910.67(c)(4) required annual boom electrical certification, which verifies that the insulated boom still provides proper dielectric protection. This testing is critical for maintaining the boom’s insulating factor and ensuring crew safety.

By ensuring these systems are functioning properly, annual inspections help extend the truck’s lifespan, maintain safe operation, and minimize the risk of costly downtime or accidents.

Lumberg advised that components should be inspected to prevent issues like corrosion, cracked seals, or hydraulic failures. This check should be conducted every year before winter sets in.

“[Components] should be kept clean, regularly maintained, and functional according to the operator’s manual,” he said.

Winter Care & Maintenance for the Chip Body

Winter weather can be tough on the chip body, especially when snow and ice build up around doors, hinges, and toolboxes. If moisture finds its way into latches, handles, or hydraulic components, freezing temperatures can quickly interfere with operations. Staying ahead of wood chip buildup and keeping the chip body clean is essential for reliable performance all season long (and beyond).

To keep the chip body in good working condition in the cold, Moses said the most important task is to ensure all the different points are greased that need to be greased.

“Grease, grease, grease – do this, because everything seems to contract when it’s cold,” he explained. “Make sure the hinges are greased, the rear hinge on the lift of the body, as well as the hoist hinge and hoist pivot points.”

Secondly, crews should dump the load and get the chips out. There might be some residual chips left in the body, but they shouldn’t affect operations.

“If you have a full load, or even a half load, I’d say to get rid of that almost daily during the wintertime. This will prevent them from condensating and freezing,” said Moses. “When wood chips freeze, it creates a huge wood block in the back of the truck. If this happens, the crew has to be in the back with a pickaxe to get them free.”

If a bucket truck must be parked outside in below freezing temperatures, a few protective measures can help minimize freeze-related damage to the chip body:

• Dump the load daily;
• Clean out around the doors, including toolboxes to prevent the door from freezing shut; and,
• Clean off ice and snow.

According to Moses, caring for the chip body in the wintertime boils down to the basics: maintaining it, cleaning it off, greasing everything, and double checking the hoist and hydraulics.

“The only time we see issues is when folks don’t grease properly. Grease weekly if you’re dumping every day,” Moses said.

“Too much grease is never a problem,” he continued. “Too little is.”

Winter Equipment Storage & Protective Measures

Even when stored or unused for extensive periods of time, mobile hydraulic equipment still requires regular maintenance. Lumberg explained that, depending upon the climate, lack of use may begin to have a negative effect in as little as two weeks.

“Storage for a period of several months will almost certainly produce some deterioration of the equipment,” he added. “Rust will form on unprotected ferrous metal surfaces very quickly, and water will collect inside unit structures.”

Lumberg explained that in dry climates, gaskets will begin to shrink during long periods of non-use, and lubricants will lose their effectiveness. In cold climates, condensation may occur in fluid reservoirs and other components.

In other words, no climate is truly “safe” for idle equipment. Whether moisture, dryness, or temperature swings are the culprit, each environment introduces its own risks. Even units that are properly prepared for storage won’t come out completely unaffected.

To combat this, Altec recommends several protective measures that mobile hydraulic equipment owners and operators should take when storing their machines for a month or longer. Following these steps helps preserve the equipment and ensure it’s ready for safe, reliable operation when brought back into service.

• Whenever possible, run the equipment through a full operational cycle at least once a week – this is the most effective way to keep everything in working order.
• Apply a light grease or heavy, hydraulic compatible oil to any exposed ferrous metal surfaces, such as cylinder rods, shafts, gears, linkages, and other unpainted components.
• Keep fluid reservoirs filled to minimize air space and reduce condensation. Before cycling the cylinders, remove any excess oil to prevent overflow.
• Protect exposed rubber or neoprene components by covering or wrapping them with UV-resistant material to shield them from sun damage.
• Disconnect electrical connectors, apply dielectric grease or a protective aerosol product, and then reconnect them to safeguard against corrosion.
• Shield switch and control panels from direct moisture exposure, ensuring they’re covered but still able to breathe.
• Cover personnel platforms to stop water from pooling.
• Shield fiberglass components from the sun and other elements.

It is a clear reminder that preparation will always pay off when it comes to maintaining tree care machinery. These precautions help bring your equipment back online safely, minimizing the risk of unwelcome surprises.

Final Thoughts

Daily, weekly, and annual inspections are far more than routine checklists — they are your first line of defense against unexpected failures and costly downtime. Consistent, thorough inspections allow crews to identify minor issues before they escalate, helping ensure your aerial devices perform exactly as designed.

With winter in full swing, this is also the ideal time to revisit your company’s policies, industry standards, and the manufacturer’s recommended service intervals. Aligning these guidelines strengthens your maintenance program and reduces the likelihood of oversight during the most demanding — and coldest — months of the year, keeping both your equipment and your team safe.