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My new scissor jack setup

timn1984

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I bought this scissor jack from Amazon for two reasons which I prefer over the OEM jack:

1) has a wider base plate

2) has a cylinder on the top

OEM jack has to be cranked to the max and maybe with a 2x4 underneath to be useful for a Jeep with a lift and larger tires.

The aftermarket scissor jack comes with a ratcheting bar (11/16” hex). I ordered a 7/8” ID 1-1/4” OD 2” length brass bearing from Grainger which fit perfectly as a spacer between the cylinder at the top of the jack and the adapters from Safe Jack. With the scissor drive cranked about halfway, I am already achieving 17” lift.

scissor jack
https://www.amazon.com/gp/aw/d/B081H362TK?psc=1&ref=ppx_pop_mob_b_asin_title

Safe Jack extender adapter
https://safejacks.com/collections/bottle-jack-accessories/products/3-piece-starter-kit

brass spacer (pack of 3)
https://www.grainger.com/product/13...gucid=EMT:10376092:Item:CSM-329&emcid=NA:Item

All together it’s over $150 plus tax and shipping. But it makes for a nice compact kit. The jack comes from China but Safe Jack and the spacer are US made.

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While I am enamored with this jack solution I do have a small concern. Since it is rare that you actually use a jack in a perfectly flat environment I am concerned that the screw in pin may shear/break off if there is the slightest angle and too much pressure.
 

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Oncorhynchus

Oncorhynchus

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While I am enamored with this jack solution I do have a small concern. Since it is rare that you actually use a jack in a perfectly flat environment I am concerned that the screw in pin may shear/break off if there is the slightest angle and too much pressure.
A valid point of concern. Here is a close up look at the parts. The OD of the threaded portion is 0.6 inches and the length is 0.65”. If the jack is not on level ground then yes there will be a torque on this threaded piece. However the threaded pin portion alone will not bear the entire load. The tapered section seats in place when you screw the piece all the way into the base which is made of a stout piece of steel welded onto the jack. If the piece is not threaded all the way into the base then the pin could become more vulnerable to exceptional stress when jacking on a non-level surface.

Time will tell. Or someone on the forum with FEA software who can do a quick stress simulation.

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3AAF5A77-B1B3-49AF-BBA1-E6E6C67F077D.jpeg
 

cmcclintock

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I bought this scissor jack from Amazon for two reasons which I prefer over the OEM jack:

1) has a wider base plate

2) has a cylinder on the top

OEM jack has to be cranked to the max and maybe with a 2x4 underneath to be useful for a Jeep with a lift and larger tires.

The aftermarket scissor jack comes with a ratcheting bar (11/16” hex). I ordered a 7/8” ID 1-1/4” OD 2” length brass bearing from Grainger which fit perfectly as a spacer between the cylinder at the top of the jack and the adapters from Safe Jack. With the scissor drive cranked about halfway, I am already achieving 17” lift.

scissor jack
https://www.amazon.com/gp/aw/d/B081H362TK?psc=1&ref=ppx_pop_mob_b_asin_title

Safe Jack extender adapter
https://safejacks.com/collections/bottle-jack-accessories/products/3-piece-starter-kit

brass spacer (pack of 3)
https://www.grainger.com/product/13...gucid=EMT:10376092:Item:CSM-329&emcid=NA:Item

All together it’s over $150 plus tax and shipping. But it makes for a nice compact kit. The jack comes from China but Safe Jack and the spacer are US made.

Jeep Wrangler JL My new scissor jack setup 3AAF5A77-B1B3-49AF-BBA1-E6E6C67F077D


Jeep Wrangler JL My new scissor jack setup 3AAF5A77-B1B3-49AF-BBA1-E6E6C67F077D
I like like this as an alternative to a high lift or bottle jack. However, with a 2inch lift and 37’s 17 inches just gets me to the frame. I am curious how high this set up will go. I would assume there is another 5+ inches left. Thanks for sharing
 
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Oncorhynchus

Oncorhynchus

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I like like this as an alternative to a high lift or bottle jack. However, with a 2inch lift and 37’s 17 inches just gets me to the frame. I am curious how high this set up will go. I would assume there is another 5+ inches left. Thanks for sharing
Here are two photos. One at 17” and one at 19” extension from the ground to the cradle of the Safe Jack adapter. At 19” extension the jack is getting close to its limit.

The Torin 6 ton bottle jack has a maximum lift of 16” which is about the same as this scissor jack. Unlike a scissor mechanism however a hydraulic mechanism has the same mechanical advantage throughout its entire range of motion.

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DHW

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Correct me if I'm wrong, but it looks like you have the cradle and the extension thing. Can you use just the bottle and the cradle without the extension?
 
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Oncorhynchus

Oncorhynchus

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Correct me if I'm wrong, but it looks like you have the cradle and the extension thing. Can you use just the bottle and the cradle without the extension?
I’d be close to the limit of the jack’s range without the extension piece.
 

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GrumpyBadger

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I have a HUMVEE 3.5 ton scissor jack that I kept in my Sportsmobile (it weighed right at 5 tons). It has never been used and is too big to lug around in the Jeep (in hindsight, I should have left it with the Sporty when I sold it). It is like this one, but new / clean. Agile Offroad at one time made adapters for the knob on this to interface with the Safe Jack pieces... I couldn't find it on their web site anymore, so that has probably faded into history - similar idea to the OP, but with a bigger jack.

Not sure what to do with this silly thing...

Jeep Wrangler JL My new scissor jack setup 1621290060159
 

GrumpyBadger

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Dang... now that I am thinking about it... perhaps I should see if a shop around here can alter the OEM jack to interface with my Safe Jack pieces. They are just collecting dust.
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