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Boat Lift Screaming

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Old 01-30-2018, 09:58 AM
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Default Boat Lift Screaming

#10,000 cradle lift with plate drives. Every fitting on the lift has been greased multiple times, including those involving the main drive gear/drive pipe. Main beams have been leveled to ensure they are true. The lift only screams at a very specific point on the way down. It's silent on the way up. Seems to be coming from the plate drive.

I've noticed the plate drives are not exactly perpendicular to the beams. Could this be causing the issue? If so, how do I adjust this?

Thanks!
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Old 02-03-2018, 05:54 PM
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Pictures? Especially this plate not being perpendicular. Since it only makes a noise at a specific point there has to be something off. You can video to capture that sound too.
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Old 02-06-2018, 06:08 AM
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Add more grease to the worm gear. You need to do it with no boat on it and as its running.
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Old 02-06-2018, 07:01 AM
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Here's how the plate drives are oriented. Lift manufacturer said this is normal. I've got so much grease in this thing that it's now a mess. The one thing I haven't tried is greasing it with the boat off the lift, which is my next step. I just can't understand why it only happens at a very specific point of travel on the way down.
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Old 02-09-2018, 03:11 AM
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Did this ever get solved?
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Old 02-09-2018, 05:22 AM
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Not yet, I'll have the opportunity on Sunday I hope...I'll report back...
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Old 05-07-2018, 05:00 PM
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Default Flat plate lift with squeal

I have the squeal on a flat plate lift and want to know if there is always a grease fitting behind the 10 inch gear. I do not see it with the plastic cover removed. Only one side squeals and only in the down direction. Sometimes the noise can be stopped by spraying oil or grease onto the collar on the back of the flat plate. This does not last long and sometimes does not work at all. I've read lots of posts but no definitive problem solution. Please help if you know how to fix the squeal permanently. I have found a replacement flat plate with gears that looks like it will work for about $300. Replacing the one on the water side will not be easy. I haven't been able to replace the belt on that side either. Thinking I may be able to reach it from a boat or submerged ladder that is long enough to reach the flat plate lift.
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Old 05-09-2018, 08:19 AM
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I've tried everything I think I can think of and mine still screeches on the way down, at a very specific point in its travel. That's what has me puzzled, because it only screeches on the way down, and only at a specific point of travel. The one thing I haven't had an opportunity to try is greasing the plate with the boat off the lift.
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Old 05-09-2018, 09:21 AM
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I have the same symptoms. I can't tell if there is a zerk fitting on what I think is a roller or ball bearing behind the large gear. I found a maintenance video on youtube that shows the collar on the back of the flat plate having to be repositioned. A lift maintenance company I hired to grease the lift came back after the squealing started and sprayed grease at the collar on the back plate but that only stopped the squeak for a month or so. I need to figure out how to get up there to work on it and not fall in the water or drop tools into the water ;-). I don't have a link to the video but search youtube for flat plate lift maintenance.
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Old 05-09-2018, 10:35 AM
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I've looked at those videos, called my lift manufacturer, gone over the plate drive 10 times, and have found and greased every zerk on the entire lift so many times that grease is oozing out everywhere. I've greased it static, greased it while my son raised and lowered it, greased it at the point it starts screeching while on the way down, sprayed Boeshield around the collar, etc., and nothing has worked. Next time I go out I'll try greasing the entire lift while the weight is off, which will hopefully allow grease into the area that's causing the screeching. One thing is for sure, it's the best built-in alarm money can buy.
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Old 05-09-2018, 12:19 PM
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Its coming from the worm gear and will only make the noise on the way down. Most all flat plate units have a zirc fitting to grease the main bearing on the large gear unless its really old..pre 1985 I believe,

You must remove the weight from the lift to properly grease it.
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Old 05-10-2018, 06:48 AM
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Originally Posted by Mooring Product View Post
Its coming from the worm gear and will only make the noise on the way down. Most all flat plate units have a zirc fitting to grease the main bearing on the large gear unless its really old..pre 1985 I believe,

You must remove the weight from the lift to properly grease it.
Thanks, there's actually 3 zerk fittings on the plate drive, two where the main and worm gears mesh, and one for the main bearing on the large drive gear. I'll try it with the boat off the lift, hopefully this weekend, weather permitting...
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Old 05-11-2018, 05:31 AM
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My dad is actually becoming more versed in this since buying the condo with a lift that wasn’t maintained properly. He found out from lift manufacture that the screeching is more than likely due to old grease that’s become solid. They said to take a torch or heat gun and lightly heat up the area and then pump new grease in to push the old stuff out.

guy also said to try and grease it with the lift running up and down. This way it’s spreading the new grease over the entire gears and pulleys. He made a point to say that we should be doing the pulleys that go in the water every 2 months

Last edited by SneakAttack; 05-11-2018 at 05:39 AM.
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Old 05-11-2018, 12:19 PM
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Originally Posted by SneakAttack View Post
They said to take a torch or heat gun and lightly heat up the area and then pump new grease in to push the old stuff out.
That I haven't tried yet, but I'll add it to the list...
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Old 05-15-2018, 02:54 PM
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Tried to post new info. while I was logged in and was told to refresh page and login. Message was lost unless an admin can find it and post it for me.
Thanks,
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Old 05-16-2018, 06:03 AM
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New info: I found a pdf that showed the gear plate main bearing behind the ring gear as a bronze sleeve bearing with a zerk fitting on it. So far I can't find the zerk fitting on my bearing. Cleaned excess grease from behind ring gear but still can't see a zerk fitting. This may explain why the squeal was silenced for a while after spraying lube onto the collar behind the flat plate.
The worm gear has two zerks and lots of lube is still present on the ring gear teeth. It is hard to maintain this lift and I think that is why so many squeal in my subdivision. Still don't have a good way to access the belt on the water side of the lift Thought of submerging a ladder, placing ladder on well tied boat etc. If you can get grease into the sleeve bearing it makes sense to run the lift up and down to distribute it around the 2" pipe. I'm looking for a flat plate lift expert repair company now ;-)
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Old 05-19-2018, 02:11 PM
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Tied boat securely with ratchet straps to pilings. Used ladder on boat to reach flat plate hoist. Greased Worm Gear box (2 zerks), sleeve bearing behind ring gear, replaced belt, oiled motor bearings two sides. Ran through short cycle without boat on lift. Did both hoists.
Ran through two cycles with boat on lift and no squealing. Not sure which one quieted the lift
because I did all the greasing, oiling, belt replacement at the same time while on ladder. Hope this helps ;-)
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