Written by Eng. Houssam Zammam
Elevator Portfolio Manager | Elevator Modernization & Vertical Transportation Consultant
If your hydraulic elevator has started settling a half inch below the floor, jerking on startup, or running slower than it used to, the oil is one of the first things to be checked. A full oil change is assumed by most owners to be the solution. Sometimes, this is the case. The oil just needs to be cleaned a lot of the time.
Simple solution: If the oil is dirty, but it is chemically good, clean it; if it is burnt, acidic, or contains water, and then change it. The only way to determine which condition is present is for a sample to be tested before anything is spent.
Regular oil testing should be part of elevator preventive maintenance, helping building owners identify contamination and deterioration before they lead to costly repairs.
Why hydraulic oil wears out faster in Las Vegas
Heat is the main enemy. A hydraulic power unit warms its own oil every time the car runs, and a machine room in a Las Vegas summer adds a lot on top of that. Oil that stays hot ages quickly. It thins out, oxidizes, and begins to leave varnish on the valve parts.
Here’s what that looks like from the elevator’s side:
- Thin oil slips past valve seats, so the car drifts at a floor, levels poorly, or starts hard.
- Varnish and sludge stick to the valve and settle on the bottom of the tank. Sticky valves cause rough rides and callbacks.
- Dust and wear metals act like sandpaper on the jack packing and seals. Fine desert dust finds its way in more easily than most people expect.
Hydraulic elevators generally don’t have the kind of fine filtration you’d find on other hydraulic equipment, so contamination builds up until somebody deals with it on purpose.
Step one is always an oil sample
Before we recommend anything, we pull a sample and send it for analysis. We’re looking at three numbers:
- Total Acid Number (TAN), which tells us how far the oil has broken down chemically
- Water content in ppm, which shows how much moisture the oil has absorbed
- ISO cleanliness code, which is the particle count
Those three results usually make the decision for us.
Offline oil filtering: how we do it
When the oil is dirty but not chemically spent, we clean it instead of throwing it out.
- We connect a filtration cart to the power unit’s reservoir. This makes a separate loop that stays off the main valve lines.
- The cart pulls oil out of the tank, runs it through multi-stage depth filters, and sends it back. It keeps circulating for as long as it takes.
- The filters catch wear metals and fine particles, and they pull out a good share of the moisture too. We can clean down to a level a standard strainer can’t touch.
- We check progress with a particle counter and stop once the ISO code is back inside the manufacturer’s range.
The elevator can usually stay in service while this happens. There’s no oil to haul away, so there’s no disposal cost, and clean oil tends to be easier on the pump, valve, and packing.
Full oil change: how we do it
If the analysis shows the oil is cooked, heavily oxidized, or holding too much water (we start getting concerned somewhere around 250 ppm), filtering won’t fix it. The oil has to go.
- We run the car down to the bottom landing so as much oil as possible drains back into the tank.
- We pump the old oil into approved containers for recycling and disposal.
- We open the reservoir and clean it by hand. Flushing alone doesn’t remove hardened sludge, and new oil poured into a dirty tank gets contaminated fast.
- With the system empty, we look over the tank seals and gaskets and check the condition of the jack packing.
- We refill with a high-viscosity-index hydraulic fluid, cycle the car through its full travel to purge air, and check valve adjustments once the oil is at operating temperature.
If a machine room has a history of running hot, this is the best time to consider adding an oil cooler, because otherwise the new oil will be aged in the same way as the old oil.
If oil treatment does not resolve leveling or startup problems, AR Elevator USA’s hydraulic elevator repair service can help identify worn valves, packing, or other mechanical faults.
Which one does your elevator need?
| What the oil test shows | What we usually recommend |
| High particle count, water and acid numbers normal | Offline filtering |
| Mild moisture, oil still in good chemical shape | Filtering |
| Dark, burnt-smelling oil with high acid number | Oil change |
| Water well above 250 ppm | Oil change |
| Heavy sludge or varnish in the tank | Oil change with manual tank cleaning |
Signs it’s time to have your oil checked
- The car doesn’t level accurately or drifts away from a floor
- Hard starts or a jerky ride
- Slower travel than you remember, especially in summer
- Oil that looks dark, cloudy, or smells burnt
- A machine room that feels hot every time you walk in
FAQ
How often should hydraulic elevator oil be tested in Las Vegas?
At least once a year. Buildings with hot machine rooms or heavy daily use, like hotels, medical offices, and apartment towers, may benefit from testing more often.
Can you filter hydraulic elevator oil while the elevator is running?
In most cases, yes. The filtration cart operates on its own closed circuit from the reservoir; hence the elevator is normally available for use by passengers.
Is filtering cheaper than an oil change?
Usually, because there’s no new oil to buy and no old oil to dispose of. But it only makes sense when the oil is still chemically sound, which is why we test first.
Does an oil change fix leveling problems?
Sometimes. If the cause is thin or contaminated oil, yes. If the problem is a worn valve, bad packing, or something in the controller, new oil alone won’t solve it.
Before deciding between filtration and replacement, building owners can also review how Las Vegas heat affects hydraulic elevator oil and overall system performance.
Hydraulic elevator service in Las Vegas, Henderson, and North Las Vegas
AR Elevator USA services hydraulic elevators across the Las Vegas valley, including Henderson, North Las Vegas, Summerlin, and Paradise. We’ll test your oil first and tell you plainly whether it needs filtering, replacing, or nothing at all.
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Written by Eng. Houssam Zammam
Elevator Portfolio Manager | Elevator Modernization & Vertical Transportation Consultant