Hey guys, it’s Jake here from your go-to towable scissor lift supplier. I get it—when you’re running a job site, the last thing you want is a mid-shift breakdown because your lift’s hydraulic oil ran low. I’ve seen too many guys skip checking the oil level and end up stuck hauling a broken machine back to the yard instead of finishing that warehouse ceiling job or tree trimming route. Today, I’m walking you through exactly how to check the oil level in your towable scissor lift—no fancy tools, no confusing jargon, just the stuff I’ve taught my own techs and our customers over the last 8 years. Towable Scissor Lifts
First off, let’s get one thing straight: this isn’t a car. A towable scissor lift’s oil is hydraulic, not engine oil, and if you mix those up, you’re in for a way bigger headache. Most of our models use a hydraulic reservoir that keeps the scissor arms lifting smoothly, and low oil here is the #1 reason for slow lifts or total shut-downs. Before you even touch the cap, you gotta prep the lift right—skip this step and your reading’s gonna be garbage. Here’s what I always tell folks: shut the lift off, lower the scissor arms all the way down until they’re fully collapsed, set the parking brake, and chock the wheels if you’re on uneven ground (even a tiny tilt throws off the oil level). I once had a guy test it on a sloped driveway and come back saying the “level was fine” before his lift died 2 hours later—don’t be that guy. Also, wait 5 minutes after shutting it off; the oil needs to drain back into the reservoir, not be sitting in the lines.
Okay, now let’s find the reservoir. This is the part where people get lost, so let’s make it easy: on most of our towable scissor lifts, the reservoir is right near the engine (or the power unit, for electric models) on the side of the machine, usually marked with a bright yellow or blue cap—we even add a little “HYD OIL” sticker to it so you don’t guess wrong. No sticker? Just follow the big rubber hoses that run to the scissor arms—they connect straight to the reservoir, so that’s your spot.
Time to actually check the level. Most reservoirs have two marks on the dipstick (attached to the cap) or a sight glass on the side—we use both on our newer models to cover everyone’s preference. If it’s a dipstick type: twist the cap off, pull the dipstick out, wipe it clean with a rag (no, wiping it on your jeans doesn’t count—you’ll get dirt in there), stick it all the way back in until it’s seated, then pull it out again. You’re looking for oil that covers both the “MIN” and “MAX” lines—if it’s below MIN, that’s your problem. If it’s a sight glass, just peer through the plastic window; the oil should sit right between the two small notches or lines printed on the glass. Pro tip: on some older models, the sight glass can get gunked up, so wipe it off first so you don’t misread it.
Now, what if it’s low? Don’t just pour any old hydraulic oil in there. We specify 10W-30 hydraulic fluid for all our towable scissor lifts—you can’t use regular motor oil or gear oil. Gear oil’s too thick, motor oil breaks down fast in hydraulic systems, and using the wrong stuff will wreck the pump and cost you thousands in repairs. To add oil, first wipe the reservoir cap area with a clean rag to keep dirt out (contamination’s the #2 killer of hydraulic lifts after low oil), then pour the oil slow—don’t overfill it, that’s just as bad as underfilling. Overfilled oil can foam up, which cuts down on pressure and makes the lifts slow or jerky. Add a little, check the level, repeat until you’re right between MIN and MAX.
Wait, hold up—are there different checks for gas vs. electric models? Yep, and I wanna clarify that because a lot of people mix them up. Gas-powered towable lifts have an engine too, so you might see two separate caps: one for hydraulic oil, one for engine oil. Electric models don’t have an engine, so their reservoir is just the one we mentioned earlier, no second dipstick to mess with. Also, electric lifts don’t get as hot as gas ones, so their oil level might hold a little longer, but still check it every 50 hours of use—same as gas models.
How often should you check it, anyway? This is a question we get all the time. If you’re using your lift every single day on a job site, check the oil level at the start of every week. If it’s sitting in your yard for a week between jobs, check it before you tow it out—you don’t wanna get to the job, unhitch the lift, and realize you’re low. Also, do a quick check if you notice anything off: lifts going slow, making a grunting noise when you raise them, or the scissor arms only going up halfway. 9 times out of 10, that’s low hydraulic oil.
Now, let’s talk about common mistakes I see: first, checking the level with the scissor arms partially up. That’s like checking your car’s oil while it’s running—you’re not getting the right reading. Second, overfilling. I’ve had guys add 2 quarts because they thought “more is better” and end up with foamy oil, which burnt out their pump in 3 months. Third, not using the right fluid. A customer of mine last year used transmission fluid because he “had a jug laying around” and had to replace the whole hydraulic system—cost him $1,800. Don’t do that.
What about if you keep needing to add oil? That’s a red flag, not a normal thing. If the level keeps dropping, you’ve got a leak somewhere—check the hoses, the connections, the reservoir seal, or the pump. A tiny, slow leak might not be noticeable until the oil’s almost gone, so if you have to top it off every week, hit up our tech team, and we’ll help you track it down.
Quick recap to make sure you don’t forget: 1. Prep: lower scissor arms fully, shut off, wait 5 mins, chock wheels if uneven. 2. Locate the hydraulic reservoir (bright cap, near lift hoses). 3. Check level: dipstick between MIN/MAX, sight glass between notches. 4. Top off with 10W-30 hydraulic fluid, don’t overfill. 5. Check every week, or before each tow if you use it sporadically.
Here’s the thing: when you buy a towable scissor lift from us, we don’t just hand you a machine and a manual—we give you access to our tech team 24/7, and this oil check is one of the first things we go over with every customer. We’ve spent years designing our lifts to be user-friendly, but we also know that small maintenance checks like this keep you working, not waiting for repairs. If you’re in the market for a towable scissor lift, or you’ve got questions about maintenance, oil specs, or anything else, don’t hesitate to reach out to our team. We’re here to make sure your job site runs smooth, no breakdowns, no headaches.
Mast Lift References:
- Towable Scissor Lift Operator’s Manual, Industry Safety and Maintenance Standards, 2022 Edition
- National Construction Equipment Association (NCEA) Hydraulic System Maintenance Guidelines, 2021
- Internal Service Data, [Our Supplier Company], 2016-2024
Shandong Zhongke Huali Machinery Co., Ltd.
As one of the most professional towable scissor lifts manufacturers and suppliers in China, we also support customized service. We warmly welcome you to wholesale discount towable scissor lifts in stock here from our factory. For price consultation, contact us.
Address: No. 2 Qubai Road, Qudi Street, Jiyang District, Jinan City, Shandong Province
E-mail: hlizhonggong@163.com
WebSite: https://www.hualiheavy.com/
