If you run a mobile crane business or just manage a fleet, you know those big machines aren’t cheap—they’re workhorses, so storing them right when they’re not in use is way more than just parking them somewhere. As a mobile crane supplier, I’ve seen way too many folks skip proper storage to save a quick buck, only to end up with rusted parts, dead hydraulics, or a whole bunch of repair bills that could’ve been avoided. Let’s break this down like we chat in our service bay, no fancy jargon, just what actually works. Mobile Crane
First off, pick the storage spot wisely. Don’t just roll it into the first empty lot you see—exposure to the elements is the #1 enemy here. If your crane’s gonna sit for more than two weeks, skip open-air yards if you can. Even a covered, locked lot is better, but if you gotta go outdoor, look for a spot that drains well—no puddles sitting under the tracks or outriggers for days. Avoid areas near saltwater, too, if you can; salt air is basically rust’s best friend. I had a customer once who parked their 50-ton crane near a coastal job site over the winter and came back to rust so bad on the boom, we had to replace a whole section of steel. That cost them three times what a proper off-season storage spot would’ve. Also, make sure the space is big enough—crane booms fold, but when they’re extended for maintenance checks, you don’t want to hit trees, fences, or other equipment.
Next, prep the exterior before you even park it. Dirt, mud, and construction grime might not look like a big deal, but they hold moisture against metal parts. So give the whole crane a deep clean—boom, tracks, outriggers, even the tiny gaps around the cab. Use a mild detergent, maybe a pressure washer on low setting so you don’t blast seals or wires. Once it’s dry, go over every metal surface with a rust inhibitor. Pay extra attention to things like the boom’s inner sections, the underside of tracks, and any bolts or fittings that aren’t coated. For painted areas, touch up any chips or scratches right away—paint is your first line of defense against rain and snow. And don’t forget the rubber parts—tires, track pads, seals. Dust them with a rubber preservative to keep them from cracking in the sun or drying out over months of storage.
Now, the guts of the crane—hydraulics and engines—are where most people mess up. If the crane’s gonna be idle for more than a month, you can’t just turn the key off and walk away. Start with the engine: change the oil and filter before storage, old oil has acids that eat away at engine parts. Fill the gas tank all the way up to prevent condensation from building up inside (condensation + gas = water, which ruins injectors). If it’s diesel, add a fuel stabilizer too—diesel goes bad fast when it sits, especially in cold weather. Run the engine for 10 minutes after adding stabilizer to make sure it circulates through the whole system.
For hydraulics, top off all the reservoir levels with the right fluid (check your manual, don’t guess) and change the filter if it’s been a while. Hydraulic lines are super sensitive—look for any cracks or leaks before storing; even a small leak will let air in, which causes bubbles and clogs when you use the crane again. Then, cycle all the hydraulics fully—boom up and down, outriggers extend and retract, winches spin—let every part run for a minute or two. That moves fresh fluid through the lines and prevents seals from sticking or drying out. Pro tip: if you’re storing it for more than three months, leave the boom slightly extended (not fully up or down) and the outriggers partially extended too. Fully extended parts put too much pressure on hydraulic cylinders, and collapsing them all the way can cause moisture to get trapped inside.
Batteries are another big one—they die way faster when sitting unused. If you can, disconnect the battery and store it in a cool, dry spot inside (like our service bay). Check it every two weeks, give it a trickle charge if it drops below 12.4 volts. If you have to leave it connected, unplug the negative cable first, and make sure all other accessories are turned off—even a small draw from the cab lights or radio will drain it over time. I’ve had customers come back in spring with dead batteries that wouldn’t hold a charge, and replacing them is a quick fix, but leaving a battery dead too long can ruin the whole unit.
Safety can’t be ignored, even when the crane’s not working. Lock the cab and any storage compartments so no one can climb in and mess with controls. Put a big “Do Not Operate – Under Storage” sign on the boom and cab, visible from the road or walkway. If your crane has a remote control, take the batteries out and store the remote separately—no one accidentally knocking a button and starting a winch or boom. Also, if you’re storing it on tracks, block the tracks so it doesn’t roll if there’s an earthquake or someone bumps into it. For cranes with outriggers, make sure they’re on solid, level ground when you park—never on soft dirt or grass that can shift under the weight over months.
Last step: check in every 4-6 weeks. Don’t just forget about it until the season starts. Pop the hood, check oil and fluid levels, look for any new rust spots, fire up the engine for 10 minutes to keep parts lubricated, give the hydraulics a quick cycle. Even in storage, mice or other small critters might chew wires or make nests in the engine bay—so do a quick walkaround to make sure nothing’s chewed through lines or cables. I once found a customer’s crane with a mouse nest in the air filter housing, which meant we had to replace the filter and clean the whole intake system before they could use it. A weekly 5-minute check would’ve saved them that hassle.
At the end of the day, proper storage isn’t about making your crane look pretty when you pull it out of storage—it’s about keeping it running for years, saving you thousands in repairs, and making sure it’s safe for your next job. If you’re gearing up to put your crane into long-term storage, or you’re a contractor looking for a reliable mobile crane to add to your fleet, hit us up to chat about what you need. We can help with storage solutions tailored to your machine, plus service to prep it for work when you’re ready.
When storing mobile cranes, always follow manufacturer guidelines for your specific model (whether it’s a telescopic crawler, all-terrain, or carry deck crane) and consult certified technicians if you’re unsure about hydraulic or engine maintenance. Regular inspections during storage help catch small issues before they become costly problems for the next job.
Wheeled Excavator References:
- National Commission on Construction Safety. (2021). Guidelines for Mobile Crane Maintenance and Storage.
- Crane Manufacturers Association of America. (2022). Off-Season Storage Best Practices for Hydraulic Mobile Cranes.
- Occupational Safety and Health Administration. (2020). Storage and Idle Equipment Safety for Construction Machinery.
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