{"id":3563,"date":"2026-10-14T13:00:48","date_gmt":"2026-10-14T05:00:48","guid":{"rendered":"http:\/\/www.purenaturalplantextracts.com\/blog\/?p=3563"},"modified":"2026-10-14T13:00:48","modified_gmt":"2026-10-14T05:00:48","slug":"how-to-prevent-overheating-of-a-used-excavator-4ee9-0a54d9","status":"publish","type":"post","link":"http:\/\/www.purenaturalplantextracts.com\/blog\/2026\/10\/14\/how-to-prevent-overheating-of-a-used-excavator-4ee9-0a54d9\/","title":{"rendered":"How to prevent overheating of a used excavator?"},"content":{"rendered":"

Hey there, I\u2019m Jake, and for the last 12 years, I\u2019ve been the go-to guy for used excavators out here in the Southeast. I\u2019ve sat on more jobsites than I can count, watched machines beat the crap out of their engines over tight deadlines, and fixed more overheating excavators than I can remember. The worst part? Most of the time, this stuff happens to used machines\u2014guys think because they didn\u2019t buy brand new, they have to skip the little checks that keep their excavator from turning into a steaming hunk of metal mid-job. If you\u2019re picking up a used excavator from my lot, or anywhere else, let me save you the headache of a mid-project breakdown. Overheating isn\u2019t some random glitch\u2014it\u2019s usually avoidable with a few simple, regular moves. Let\u2019s break this down like we\u2019re talking over a coffee at the shop, no fancy jargon required. Used Excavator<\/a><\/p>\n

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First off, let\u2019s get one thing straight: used excavators don\u2019t overheat because they\u2019re \u201cold.\u201d They overheat because their owners skip the basic maintenance that new machine owners get handed on a silver platter. I\u2019ve got a 2018 Kubota on my lot that ran 10 hours straight last week without a blip, and a 2022 model sitting across the yard that\u2019s been in three times this month for overheating\u2014turns out the new owner forgot to check the coolant level. Let\u2019s start with the most obvious, most overlooked step: checking your cooling system before you even fire up the machine that first time, and every single day after that. I see guys show up to a job, drop the excavator, and immediately start digging without lifting the hood. That\u2019s a fast track to trouble.<\/p>\n

Coolant is the blood of your excavator\u2019s cooling system\u2014just like blood needs the right mix, coolant isn\u2019t just water. A lot of used machine owners mix water and old coolant, or even straight water, because they think \u201cit\u2019ll do for a quick dig.\u201d Newsflash: water boils at 212\u00b0F, but your excavator\u2019s engine runs at around 195-220\u00b0F\u2014so straight water will turn to steam before the engine even hits its sweet spot. Good coolant, the kind I fill every used machine with before it leaves my lot, has corrosion inhibitors that keep the radiator and engine block from rusting, and a higher boiling point (usually around 260\u00b0F for standard stuff, even more for heavy-duty). Here\u2019s the trick: don\u2019t just check the overflow tank\u2014open the radiator cap (wait till the engine is totally cold, by the way\u2014steam will burn the shit out of you) and make sure the level is up to the line. If it\u2019s low, top it off with the right coolant for your machine, not that cheap blue stuff from the gas station. Most excavators use ethylene glycol-based coolant, but some newer models use organic acid tech\u2014ask me, or your mechanic, if you\u2019re not sure, don\u2019t guess. And if you see any gunk in the coolant, that\u2019s a red flag\u2014rust, oil mixing in, that means you\u2019ve got a leak or a bad head gasket, and ignoring that will lead to a melt-down for sure.<\/p>\n

Next up, the radiator\u2014this thing is like the lungs of your excavator, and if it\u2019s clogged, your machine can\u2019t breathe. Used machines, especially the ones working in dirt, mud, or dust (which is basically every jobsite), get their radiator fins packed full of crud. I had a guy bring in a 2019 Cat last month; he\u2019d been digging around a gravel pit for three weeks without checking the radiator. When I lifted the hood, the fins were so packed with dust and fine gravel you couldn\u2019t see the metal. No wonder it overheated every afternoon\u2014air couldn\u2019t get through to cool the coolant. The fix? You don\u2019t need a fancy pressure washer (though a gentle one works, just don\u2019t blast the fins too hard or you\u2019ll bend them). Every single day, before you start work, take a soft brush or even an air compressor on low pressure and knock off the loose crud from the front of the radiator. If it\u2019s really packed, pop the radiator grill off and get in between the fins\u2014pay attention to the sides and the bottom, that\u2019s where crud hides. I always tell my customers at the lot: if you\u2019re working in dusty conditions, do this twice a day, not once. I\u2019ve seen guys save $10k on a new radiator just by spending 5 minutes a day brushing off fins.<\/p>\n

Another big one that people sleep on: checking the water pump and the thermostat. The water pump moves the coolant through the engine and radiator\u2014if the impeller is worn, or the belt is slipping, coolant isn\u2019t flowing like it should, and boom, overheating. For used excavators, especially ones with 5,000+ hours on them, the water pump\u2019s bearings can wear out, the belt can crack or stretch so much it slips. How do you check this? Every 250 hours, or whenever you change the coolant, inspect the belt. It should have about half an inch of give when you press on it\u2014any more, it\u2019s too loose, and you need to adjust or replace it. And if you hear a squeal when you start the machine, that\u2019s the belt slipping, don\u2019t ignore it. As for the thermostat\u2014this little valve controls when coolant flows to the radiator. If it\u2019s stuck closed, coolant can\u2019t circulate, and overheating happens fast. A lot of guys will replace the thermostat when they do coolant, and it\u2019s a cheap part\u2014like $30-$50 for most excavators. I throw a new thermostat in every used machine I prep for sale, because it\u2019s a $50 part that avoids a $2,000 repair.<\/p>\n

Now, let\u2019s talk about how you operate the machine\u2014this is where a lot of new used excavator owners mess up, especially if they\u2019re coming from a smaller machine. Used excavators are built for consistent work, not hammering the throttle all day. I see guys hop into a 10-ton excavator, put it in full throttle, dig a 10-foot deep hole in 20 minutes, and wonder why the engine is steaming 2 hours later. That\u2019s called \u201clugging\u201d the engine, and it\u2019s a huge cause of overheating. When you push the excavator harder than it\u2019s built for\u2014like lifting a load that\u2019s too heavy, or digging through rock without breaking it up first\u2014your engine has to work way harder, which makes it run hotter. Here\u2019s the rule: keep your throttle at the recommended setting. Most excavators have a \u201cstandard\u201d throttle and a \u201chigh\u201d throttle for heavy loads. Use the standard setting for most digging, only kick it up when you need extra power for lifting really heavy stuff. Also, don\u2019t let your machine idle for hours on end. A lot of guys will start their excavator in the morning, go get coffee, and leave it idling for 2 or 3 hours before they start work. Idling means the engine is running, but there\u2019s not enough load to warm up the coolant properly, and the radiator isn\u2019t moving enough air to cool it. If you have to idle, keep the throttle at a low, not idle, setting, and move the machine a little every 10 minutes to get some airflow going.<\/p>\n

Wait, and let\u2019s not forget about the hydraulic system\u2014wait, some people mix up engine overheating with hydraulic overheating, but they\u2019re linked. If your hydraulic system is working harder than it should, it puts extra strain on the engine, which makes the engine coolant run hotter. A clogged hydraulic filter, or hydraulic fluid that\u2019s old and dirty, can make the hydraulic pump work overtime, which leads to engine heat. So changing your hydraulic fluid every 1,000 hours (or whatever the machine\u2019s manual says) isn\u2019t just for the hydraulics\u2014it\u2019s for preventing overheating. I always set a reminder for my customers at the lot to do that, because skipping fluid changes on a used machine is a one-way ticket to overheating town.<\/p>\n

Now, what do you do if your excavator does start overheating mid-job? I\u2019ve seen guys panic, yank the throttle all the way, and shut it off right away\u2014 that\u2019s bad. If you shut off a hot engine right away, the coolant that\u2019s still in the engine can boil, and the pressure can blow hoses or crack the engine block. Instead, ease off the throttle, put the excavator in neutral, and let it idle for 5-10 minutes. Once the temp gauge starts to drop, you can shut it off. If you\u2019re stuck in the middle of a jobsite, pull over to a shaded spot (if you\u2019re lucky enough to have shade) and keep the engine idling, then check the radiator. If it\u2019s packed with crud, brush it off while it\u2019s idling\u2014don\u2019t open the radiator cap until it\u2019s totally cold, though. And if the temp is spiking and staying high, don\u2019t keep running the machine\u2014you\u2019ll blow the engine, and that\u2019s a $20,000 mistake, easy.<\/p>\n

Let me be real with you\u2014when you buy a used excavator from me, I don\u2019t just toss you the keys and say \u201cgood luck.\u201d Every machine on my lot gets a full pre-delivery inspection, including checking the cooling system, changing the coolant, cleaning the radiator fins, and replacing worn belts and thermostats. But that\u2019s just the start. The number one reason my customers come back (or send their friends) is because I don\u2019t just sell machines\u2014I tell them the truth, even the boring maintenance stuff that keeps their machine running. I\u2019ve had a customer from Atlanta call me last month, panicking because his new-to-him Cat was overheating on a foundation dig. He said he\u2019d checked the coolant but didn\u2019t think to clean the radiator. I told him to pull the machine to the side, grab a brush, and knock off the dust. He did it, and his temp dropped 20 degrees in 10 minutes. That\u2019s the stuff no YouTube tutorial will tell you\u2014you don\u2019t need expensive parts, you just need to pay attention to the small shit.<\/p>\n

Another thing I\u2019ve learned over the years: don\u2019t wait for the temp gauge to light up like a Christmas tree. Most excavators have a warning light that comes on before the engine gets too hot\u2014pay attention to that. If the light flickers, or the temp needle creeps up past the middle, that\u2019s your signal to check the radiator, ease off the throttle, not keep pushing. I had a guy in Charlotte last year who ignored that light, kept digging, and ended up with a cracked engine block. He spent $15,000 on a new engine, and it all could\u2019ve been avoided by stopping for 10 minutes when the light first came on. Used machines have more hours, more wear, so they\u2019re more prone to little issues showing up early\u2014don\u2019t brush off the early signs.<\/p>\n

And let\u2019s talk about a common mistake with used excavators: the owner doesn\u2019t have the operator trained. A lot of guys will hire a operator who\u2019s never run that specific machine, or a operator who\u2019s used to beating on smaller machines. I\u2019ve had customers tell me \u201cmy operator knows what he\u2019s doing\u201d and then I watch him run a used excavator like it\u2019s a mini-excavator, full throttle all day. That\u2019s not good\u2014operators need to know how to handle the machine, how to adjust throttle, how to spot when the temp is spiking. I always tell my customers to make sure their operator gets a quick run-through on the cooling system basics before they start work, because even a good operator can make a mistake if they don\u2019t know the machine\u2019s quirks.<\/p>\n

Now, before you go\u2014if you\u2019re in the market for a used excavator, don\u2019t let overheating scare you. Every used machine has quirks, but with the right checks, it\u2019s avoidable. I\u2019ve got machines on my lot from 2016 to 2023, all serviced regularly, all run smooth. If you have questions about a machine, or want to pick up a used excavator that\u2019s been prepped right, hit me up. I\u2019m not a sales guy who\u2019ll pressure you\u2014 I\u2019ll tell you if a machine is a good fit, or if you need something else. Just reach out, and we can work out a deal that works for your jobs.<\/p>\n

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At the end of the day, used excavators aren\u2019t like new cars\u2014they\u2019re workhorses, built to get dirty and dig hard. But they still need care. Skip the daily checks, ignore the temp light, mix water and coolant, and you\u2019ll end up stranded on a jobsite with a steaming hunk of metal. Do the little stuff: check coolant daily, clean the radiator, replace old belts and thermostats, run the machine right, and your used excavator will run for thousands more hours. I\u2019ve seen it happen a hundred times, and I\u2019ll keep telling anyone who\u2019ll listen\u2014maintenance isn\u2019t a hassle, it\u2019s how you keep your machine working for you, not against you.<\/p>\n

Side Board Semi Trailer<\/a> References:<\/p>\n

    \n
  1. Caterpillar Inc. (2021). Operation and Maintenance Manual for 320 Excavator.<\/li>\n
  2. Deere & Company (2020). Cooling System Care Guidelines for Medium Excavators.<\/li>\n
  3. Construction Equipment Association. (2022). Best Practices for Used Heavy Machinery Maintenance.<\/li>\n
  4. Kubota Tractor Corporation. (2019). Used Excavator Pre-Delivery Inspection Checklist.<\/li>\n
  5. Society of Automotive Engineers. (2021). Hydraulic and Engine Cooling System Compatibility for Off-Road Equipment.<\/li>\n<\/ol>\n
    \n

    Heavy Leading Company Limited<\/a>
    Heavy Leading Company Limited is one of the most experienced used excavator manufacturers and suppliers in China, featured by quality products and low price. Welcome to buy discount used excavator in stock here and get pricelist from our factory. We also accept customized orders.
    Address: Guotang, Quanpu, Liangshang, Jining City, China
    E-mail: truckalex@heavyleading.com
    WebSite:     https:\/\/www.truckalex.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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