|09-11-2014 12:12 PM|
The cars that I have seen fall from a two post was not the fault of the lift it was the guy who put them on the lift. He didn't get it right, or they didn't as like I said I saw one in person and several in pictures, one not too long ago where I think it was a Audi that fell on a BMW, I would bet that guy got promoted right out of the shop.
I like the two post as you don't have as much in your way when working, but I like just driving on an hit the up lever. I also can lift one and park another under it.
|09-11-2014 08:25 AM|
Open top on my Metro. Cables run in a tray across the floor. Like I said, no issues with no special prep to install the lift.
Now, lifting a big rig like your F350, I would probably not do without some re-work of the pad area's. Lifting less then 4000#'s doesn't seem to be a problem with a plain slab. It just depends on what you plan to do with it.
|09-11-2014 07:06 AM|
A two post with a substantial top connecting structure will not put much stress to tip the posts over. before I lift my dually F 350 dump again I will build a heavy inverted U bracing and bolt it to the top of the posts. My two post has the connecating cables and hoses recessed in the floor witn a metal cover.
|09-10-2014 10:47 AM|
My 9,000 lb. Metro 2 post is bolted to my 4" slab. Minimum requirement from the manufacturer. This was put in as an after-thought but I have had no issues with it and all of the bolts are tight with no floor cracks after 5 years of use. An Astro van body has been sitting on the hoist since last November with no issues.
IF I was doing this from scratch with a new pour I would dig out two 18 x 18 x 6" deep pads and call it good.
|09-09-2014 02:20 PM|
There is not a thing wrong with two post lifts, except they stay where you put them. If you get it wrong they stay there or you jack hammer them up.
With the four poster you can move it around, out of the way.
I have seen one car fall off a two post lift, and I have seen many pictures of cars that have fallen off lifts, all two posters. Just make sure you are putting it in the right place, and that the car is on it right.
|09-07-2014 05:08 PM|
|hduff||Here's a link to pics for my two-post footings.|
|07-17-2014 01:19 PM|
I just have seen a picture yesterday, at a high end car dealership where a I think it was a BMW fell off a two post and fell on another car.
You just have to make sure the car is on it right, can't be in a hurry.
|07-16-2014 08:54 PM|
|07-16-2014 04:04 PM|
Sorry for test typing phone and lost 3 attempts
I'm putting a 3.5ft X 3.5ft pad for each post with rebar...they will be about 8 in thick...all done in one pour will try to post a pic....ready pour when I get a day off.
|07-16-2014 04:02 PM|
|backwaterdogs||Test from phone|
|07-16-2014 02:49 PM|
|[email protected]||I have a 2-post and love it. I installed it on a new, cured 4" slab but had to straddle an expansion joint which is a no-no. Sure enough, one post began to rubbleize the cement, I'm sure because of the weakness of the expansion joint. I cut out the cement a foot around the base of the post, dug it down about 10", jambed rebar under the exissting slab and spanned the new hole and refilled it with QuickCrete. Of course I installed new J-bolts B4 pouring the cement. A Sunday's work and I was back in business. The other post is fine, cement is as good as the day it was poured. I would pour your slab 6" a couple ft around the each post, no expansion joints in the area, put a grid of 1/2" rebar there and you could iift a 747 with no problems.|
|07-16-2014 02:36 PM|
I have a 2-post, a 4-post and a Kwick-Lift. All have their uses.
The 2-post is great for suspension/brake work. The 4-post is great for everything else. The Kwick-Lift is great for body work and under-dash work.
For my 2-post lift, I prepared 4'x4'x2' deep footings tied into the surrounding floor with re-bar; I used a 5000-PSI concrete that the pros that installed the lift recommended.
|07-07-2014 03:37 PM|
Thanks everyone for all the input
the min spec from rotary is 4." of 300o psi...this where I'm getting things to now:
Overall thickness is about 5", will use 4000 psi with fiber reinforcement. I also done as suggested anc reated 3.5 x 3.5 ft area for each post, with 4" of well compacted ca6 and an additional 4 inches of concrete + rebar. So under the posts, will have about 8" of 4000 psi fiber reinforced plus rebar.
Based on other input, I alredy dowelled it to the other slab...hopfully just overkill and not problematic.
I'll try and post a pic later of the prepped area.
Great forum, btw thanks, all!
|07-07-2014 01:07 PM|
there is no need to dowel your slabs together unless your planning on run loaded 18 wheelers at highway speeds
also no need to pour a thicker 10x60 slab for a single hoist, just thicken a 3x3 area under each post or a 12x12 are under the lift
i prefer drop in anchors over j-bolts as locating the bolts can be challenging for an experienced millwright
and this is not a recommended install procedure by the manufacturer
through drill all the anchor bolt holes, this takes no strength from the install and
makes it easy to pound down the anchors if you ever move the lift
use the size and number of anchor bolts as recommended by the manufacturer
we have 4 two post lifts in the shop and have moved the shop 3 times in 10 years.
every shop has had unknown concrete with a min of 5'' concrete to deal with.
the only time i worry about a hoist is lifting my extended cab 8 foot box or the f250 4 door trucks
when we get them up in the air we put a jack stand under the hitch for stability
definitely do not use the sonotube idea that has fail written all over it
|07-05-2014 01:10 PM|
I know most like a two post, but I have a four post for two reasons. When in high school I saw a car fall off a two post at a service station fell right on another car. Granted the car was more than likely not on the lift right, but never the less it fell off, it is pretty hard for that to happen on a four post. Number two reason I can move my 4 post around, No I don't have the 4 poster bolted down, One reason I have a heated floor, I have had one for years and never bolted them down, and I have wheels to move it that came with the lift. If I do move it I can square it up and I'm good to go.
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