If you’ve ever walked around a construction site or a demolition yard, you know second hand loaders are workhorses. They shift tons of gravel, load dump trucks, and navigate tight spaces where bigger machinery can’t fit. But every time I chat with someone looking to buy a used loader, one question always comes up: “What’s with the lubrication system? Why does it matter if I’m buying it secondhand?” As a second hand loader supplier, I don’t just sell machines—I make sure every loader leaves our yard is ready to work, and that starts with understanding its lubrication system. Let me break this down like I do with every customer who walks through our door. Second Hand Loader
First off, let’s keep it real. A loader’s lubrication system isn’t some complicated black box you have to pay a mechanic to decode every time. It’s a network of parts designed to keep moving pieces from grinding each other to bits, and on a used machine, how this system was cared for is everything. I’ve seen loaders that look like they’ve survived a war, but their lubrication system was serviced religiously—they still run like new. And I’ve seen nearly new used loaders where someone skipped a grease job and ruined the entire boom pivot. So let’s start with the basics: what actually is this system, and what does it do?
At its core, the lubrication system on a loader is a mix of two main parts: the hydraulic lubrication system and the chassis lubrication points. Wait, yeah—people often mix these up, and that’s a mistake. The hydraulic system is the big one, it uses fluid to power the boom, bucket, and steering, and that fluid also acts as lubricant. The chassis points are all the little pivot joints, pins, and bushings that don’t use hydraulic fluid—they need grease. I always tell customers: if you only pay attention to the hydraulic fluid and skip the pin grease, your loader will stop working in months.
Let’s talk hydraulic lubrication first, because that’s the heart of the system. A loader’s hydraulic system is made up of a pump, hoses, valves, cylinders, a reservoir, and filters. The lubrication here is hydraulic oil. When the engine runs, the pump pushes this oil through the system under high pressure. This oil doesn’t just power the loader’s lift and tilt functions—it coats every moving part inside the pump, valves, and cylinders to stop metal-on-metal contact. No oil, and those parts would generate so much friction they’d overheat, seize up, and cost thousands to fix.
On a used loader, the key signs to check with the hydraulic lubrication system are oil condition, filter history, and contamination. Over time, hydraulic oil breaks down. It gets dirty, picks up metal shavings from wear, and can even turn acidic if it’s old. If a previous owner didn’t change the hydraulic oil and filters regularly, that’s a red flag. I always show customers the hydraulic dipstick when they look at a loader we have. Fresh, good oil is amber-colored. Dirty, bad oil is dark, cloudy, or has a burnt smell. If we’re selling a loader that’s been in our yard, we always do a full hydraulic oil and filter change before it goes to a new owner—because I don’t want someone’s first job with their new loader to be dealing with a clogged valve or a seized cylinder.
Contamination is the biggest enemy here, especially on used machines. Dirt, water, and debris can get into the hydraulic system if the reservoir cap is left off or if hoses are damaged. I once had a customer bring in a 2018 loader he’d bought from someone else, and the hydraulic oil had milky white streaks in it—turns out the previous owner had a small leak in a hose that let water in. That cost him $1,200 to flush the system and replace all the valves. On our end, we pressure test every hydraulic line and check for water in the oil before we put any used loader up for sale. It’s extra work, but it saves our customers from headaches down the line.
Now, the chassis lubrication system—this is the part that most first-time loader buyers overlook, and it’s where so many used machines go wrong. The chassis points are all the pivot pins: the ones that connect the boom to the chassis, the bucket to the boom, the steering joints, and even the lift arm links. These points don’t use hydraulic oil—they need thick, high-pressure grease to lubricate the bushings and pins. When a machine is working on a construction site, these pins move thousands of times a day. No grease, and they start to grind, wear out, and get loose. A loose boom makes the loader unsafe to operate, and replacing those pins and bushings can take days and cost more than some small loaders are worth.
Here’s the thing about chassis lubrication: it’s a simple task, but it’s easy to skip if you’re in a hurry to get a job done. A lot of small contractors who buy used loaders will do their own grease jobs, but big companies with multiple machines will hire a technician to do it every 50 hours of operation. On our used loaders, we mark all the grease points with colored caps so new owners can easily find them, and we give a free pocket guide that shows how many times to grease each one based on use. I’ve had customers tell us they appreciated that—they didn’t know there were 22 grease points on a standard loader until we pointed them out.
Now, let’s talk about how the lubrication system wears on a used loader, because that’s what our customers care about most. When a loader is new, every pin and seal is tight, every filter is clean, and the hydraulic fluid is perfect. After a few thousand hours of work, though, small things start to add up. For example, if the hydraulic filter is never changed, it gets clogged, so the pump has to work harder. That makes the oil hot, which breaks it down faster and causes more wear on the pump. On a used loader, we check the total hours on the machine—we only sell loaders that have clear maintenance records, so we can see when the oil was changed and when the grease jobs were done.
I always tell customers that a used loader isn’t a problem—it’s a smart investment if you know how to check the lubrication system. Last year, we had a customer who was a small landscaping contractor. He couldn’t afford a new loader, so he came to us looking for a 5-year-old model. We showed him two loaders: one with 4,000 hours, service records every 50 hours, and a lubrication system that was immaculate, and another with 3,800 hours but no service records, oil that was dark, and pins that had barely been greased. He bought the first one, and six months later he sent us a note saying it was running better than the new loader his friend had just bought. That’s the kind of feedback I love.
But let’s be honest—sometimes even the best lubrication system can’t save a loader that’s been abused. If a previous owner ran a loader with no hydraulic oil, or skipped grease jobs for hundreds of hours, we won’t sell it. We’d rather keep it in our yard than send out a machine that will break down a week after delivery. As a second hand loader supplier, our reputation is built on getting customers a machine that works, so we don’t cut corners on the lubrication checks.
What do new owners need to know about maintaining the lubrication system after they buy a used loader? First, don’t skip the scheduled oil changes. Most loaders recommend changing hydraulic oil every 1,000 hours, and transmission fluid every 2,000 hours. Second, don’t use cheap grease. Buy the manufacturer-recommended high-pressure grease for the chassis points—cheap grease breaks down fast, especially in dusty construction sites. Third, check for leaks. Look under the loader every week for wet spots on the hoses or around the reservoir. A small leak today can turn into a big problem tomorrow.
I also tell customers to keep a log of their lubrication maintenance. It doesn’t have to be fancy—just a notebook or a phone note that says when you changed the oil, when you greased the pins, and how many hours the machine has. That log isn’t just for routine maintenance—it’s also valuable if you ever decide to sell the loader yourself. People will pay more for a used machine with a full maintenance history, especially for lubrication.
Let’s wrap this up, because I know you’re here to learn, not just listen. The lubrication system of a second hand loader isn’t something to be intimidated by. It’s the set of parts that keep your loader moving, and on a used machine, its history tells you more about the loader’s condition than any other part. When you’re looking for a used loader, don’t just look at the age or the hours—ask about the lubrication system. Did the previous owner change the oil regularly? Were the grease jobs done on schedule? What shape are the filters and seals in?
As a second hand loader supplier, we’ve checked all of these boxes for every machine that leaves our yard. We know buying used machinery is a big decision, and we don’t want you to worry about hidden problems. Our team will walk you through every part of the loader, including the lubrication system, answer all your questions, and make sure you leave with a machine that’s ready to work for you.
If you’re in the market for a second hand loader, don’t settle for a machine that hasn’t been properly maintained. We have a range of loaders in different sizes and hours, all with their lubrication systems checked, serviced, and ready to go. Whether you’re a small contractor just starting out or a big company looking to expand your fleet, we can help you find the right loader for your needs. Reach out to our team to discuss your requirements, check availability, and get all the details on how we make sure every loader we sell is built to last.
Truck References
Hydraulic Lubrication Systems for Construction Equipment. Construction Equipment Maintenance Association.
Chassis Lubrication Best Practices for Heavy Machinery. International Journal of Construction Equipment Management.
Second Hand Loader Inspection Guidelines. Global Heavy Machinery Suppliers Association.
Loader Hydraulic Fluid Condition Monitoring. Society of Automotive Engineers.
Heavy Machinery Lubrication Standards. National Institute for Occupational Safety and Health.
Liangshan Guanyue Auto Trading Co., Ltd.
As one of the leading second hand loader manufacturers and suppliers in China, we warmly welcome you to buy bulk high quality second hand loader at low price from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Address: Liangshan County, Jining City, Shandong Province
E-mail: guanyuetruck@gmail.com
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