Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > General / Other

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 07-23-2012, 08:34 AM
millsrj millsrj is offline
TT Newbie
Join Date: Jul 2012
Boat: 2001 Princecraft
Location: northeast
Posts: 1
Boat Lift Modifications

Grab a coffee, this is a long story.

I bought a used boat lift about a month ago. It is a 3000 lb Dock-Rite vertical lift with a wheel winch. My shore drops off quickly to about 88" of water over about 9" of muck. I get someone to clean and re-weld all the welds, plus I get them to make 4 new legs 60" long. I figure it will be good to have about 14-16" of leg still inside the frame (the legs slide inside the frame like a sleeve) for added stability. The legs are 2"x1.5" T5 Aluminum tube (1/8" thick). I also got a 4500lb winch installed. My boat weighs 2050 lbs unloaded.
The lift is only 108" wide, and my boat is 96" wide. This new winch (when I got it home) sticks out 6.5" so I (stupidly) moved the bunks over to give clearance.

So I float the contraption out to my dock. I extend the legs 48" below the frame and it settles in nicely. I float the boat on and start to winch it up. Realize that the bunks are 5" off-center toward the outside here. The boat gets 6" above the water. The back-outside corner starts to sink and I figure it's due to muck, then the whole thing goes over. The back legs buckle and the boat slides off. Here are my questions for the group:

1. should I have done this in the first place. Is 48" of leg too much for 2"x1.5" aluminum tube
2. would T6 aluminum have made any difference?
3. was this all caused by the weight shift onto the back outside leg? if I did not move the bunks would this have happened?
4. would cross-bracing on the ends help? If so, should I cross brace the sides as well?
5. I could try to find thicker aluminum. Should I think about steel tubing instead?

thanks guys


Last edited by millsrj; 07-23-2012 at 11:53 AM.
Reply With Quote

aluminum, lift

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -4. The time now is 11:07 PM.