Dover elevator with oil viscosity control active 

The Schindler MT elevator at the former JCPenney at Valley View Center Mall is from the mid 1990's. The call button on the 1st floor said "UP" instead of an up arrow

Viscosity control theres actually a US patent with the details: Dover Corporation, Memphis, Tenn., a corporation of Delaware Filed Aug. 16, 1968, Ser. No. 753,105 Int. Cl. B66b 1/04 US. Cl. 18717 14 Claims ABSTRACT OF THE DISCLOSURE In a hydraulic elevator installation, a thermostat is included in a closed loop path in which oil may be recirculated by a pump. A valve controls exchange of fluid between such path and the jack for the cab so as to cause the cab to move up and down or be parked. The thermostat responds to a drop in oil temperature to a cut-invalve to cause the pump to recirculate fluid in the mentioned path until the oil is heated by turbulence effects to a selected higher cut-off temperature. Recirculation for heating purposes is continuous over the period the thermostat signals for heat except when the cab is required to respond to a down movement signal. In the absence of other control, the cab is lowered to and kept at the lowest floor in response to the thermostat signal so that most of the oil of the system is out of the jack and in the closed loop path to be subject to heating.

It looked cold outside, possible viscosity control to prevent the oil from getting too thick and cold and also to keep the fluid warm and usable so it wont be so bouncy

How come you are so good at sacrificing you're camera at the end of your videos

There's nothing wrong with it. It cycles the oil periodically to prevent overtravels and bad-levelling.

It was cycling oil.

Dover is actually one of the first that started oil cycling.

It's cycling oil.

it did the same thing with the Dover at the Memorial Hospital CA the motor was on but it stayed in L1 I wonder why?

elevators are awsome. i love having elevator fun. i have ridden a lot of dovers. but never one that is not working right.

I have observed a 2002 Schindler do that. When the door closed the motor would start up but the elevator never moved.

At least it's working (somewhat) right. If it don't get stuck, that's fine with me. Although if you know the management contact, you might want to give them a call/message.

push em all in sequence, then reverse sequence, then primes, then extents, then odds, then evens, then push em twice each in ascending order, after that spin around and say "I love to play digem butts while I ride a dover" three times (best done when other passengers are present)- once you have completed these important tasks, you will be worth of consideration for the secret floor club

probably just keeping the pipes pressurized

In its preferred form, however, the invention relates to elevator installations with hydraulic systems which are rendered of closed-loop configuration by the mentioned by-pass means, and in which heating of the fluid is primarily accomplished by recirculation of the fluid in the closed loop path therefor. As an aspect of the preferred form of the invention, if the cab is above the lowest floor when the thermostat means first signals for heat, the cab is lowered to that floor and is kept at such floor in the absence of calls requiring up movement of the cab. In this way, most of the fluid in the jack means is forced out of the jack means and into the recirculation path so as to be subject to recirculatory heating.

i have been on a dover before. actually like 10. they never failed me.

My school elevator does this ALL The Time

I guess you never heard of viscosity control. Most elevators which have outside machine rooms or shafts, like a parking garage, have a special function that lets the oil stay at operating temperature. This is done by forcing oil through the valve without letting the machine run. That Dover is working as designed. The design also brings it down to a programmed floor, usually the lowest, to make sure as much oil as possible is in the tank. Ask an elevator mechanic next time before publishing something like this.

It's like a car engine running in neutral.

It stopped at 2 and 1 because someone pressed the button and didn't use it! Not nice!

that is a fire waiting to happen!!!

The Schindler HT Elevator at my middle school had that same thing

What is dry power?

Here is what an elevator man can tell you about this elevator. That is a Dover DMC with a dry-mount pump, probably a 30 or 35 horse motor, attached to a solid state "soft start" motor starter. Here's how I know. If it was a "relay logic" elevator, you would be able to hear the mechanical floor switches as it passed them. Thus it is a DMC with a tape selector. The sound the motor makes when it fires up is that of a soft-starter instead of mechanical "across the line" or "Y"/"Delta" starters. If you'd like to learn how to figure all this out from a 4 minute video, I suggest you apply yourself to the five-year apprenticeship. Then you'd know that the "running while not moving" is very normal and common.

"The messed up Dover"

I like the motor. Is that a dry-powered elevator? I always wondered...

I never know that an elevator could park at a floor

how many times did you say "now watch this!" during the video?

Andrew,did you take off i got stuck in the elevator last nite?

Hey Michael Morgan, stop namecalling Andrew.

The hydraulic kone elevator in town usually malfunctions in hot weather, I guess the oil becomes too thin when its warm, and leaks resulting in low pressure so elevator won't move and does weird things.

Very Intersting but i wonder that why the elevator stop on every floor but is not supposed to stop on every floor it supposed to go down all the way to the first floor wich is the ground Level. The reason why the motor is running because so it can heat the oil so it can leveled property.

that guy who calls you press the elevator button, I'm not stupid

Can we get an update on this elevator? Is the motor still running when it's stopped? Are they still doing lots of construction work on the parking garage?

hmmn that DOVER elevator fixed? hello dieselducy !

The only elevator I've ever been stuck in was a Dover Impulse a few years ago (Might have actually been a ThyssenKrupp). I've never been stuck on an Otis or a Schindler, despite the fact that I don't really like Schindler.

You can tell it parks at G* and 6 a lot, as the indicators are near burned out.

that's just 1 half famous and half infamous elevator. all those elevator photographers on RU-vid know about this elevator. since it gets stuck a lot and stuff like that.

maybe the motors are running only when its stopped becouse its recharging its hydralic pressure? And maybe its running out of pressure, maybe thats why you stopped in the other videos?? im not sure.... :S

is it night time?

I've seen a couple of new Otis hydraulic elevators that do that. It sounds like they're about to go up but they don't go anywhere and all you hear is the hydraulic motor. I'd like to find out why they do that.

Maybe an invisible man pushed the elevator button at floor 2

Why is the number 6 sideways

the elevator pushed its own buttons on 2 1 and G

wow the elevator moder runs if the elevator is not moving.on the market parking deck

In the middle of the summer?

So, is it fixed?

Whats the link to the video where dieselducy gets stuck in this elevator.

we have those same dover elevators at my mother's job I hate them i got stuck in one for 5 hrs on the top floor on my way down

it runs to keep the oil flowing and warm

@dieselducy how did you get out on the first episode??

and a waste of a lot of energy.

Patrick on the phone!

0:27 umm not such a good idea...

The elevator stop at 2 with the heck

Dover Elevators Got Bad Hydraulic Oil

Maybe 'good-for-nothing' yobs (Messed up teenagers, they are normally quite nice) called it at 2 & 1? Anyway, Maybe the motors starting up because of an error with the lift-to-motor control interface? It's telling the motor that the lift wants to move (When in actual fact it's not) and when the call button is pressed it finally becomes correct and says that the lift isn't moving! The doors close and the problem begins again.

But still I do like dover elevators

thats not good for that elevator it will over heat and give out

ride your scooter down the garage lanes to prevent gettin stuck :)

at least it's moving

0:03 had me dead

lift

u should open the phone cabinet

oh

Just because you don't have even an elevator company!

at ground floor the door wouldnt open

this elevator really has a lot of problems

Dover elevators are crap

does.. this guy have nothing but videos about one elevator? What the fuck?

1.that is the fan making the noise 2. His friend is pressing the th Button on floor 1 and 2 3. He is gay

It was cycling oil.

maybe the motors are running only when its stopped becouse its recharging its hydralic pressure? And maybe its running out of pressure, maybe thats why you stopped in the other videos?? im not sure.... :S