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Forums13
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Apr 9th, 2026
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Joined: Apr 2020
Posts: 520 Likes: 2
addict
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addict
Joined: Apr 2020
Posts: 520 Likes: 2 |
I have a Dover 2-stop IVO jack that has a real bad rumbling/thumping coming out of it while running up. I found and replaced two bad guide rollers and thought I had it whipped. I know that the jack has some sort of roller guide system inside the casing on top of the car but I was a really young repair helper the last time I was involved with unscrewing one of those jacks on the cartop and probably had my mind on girls instead of learning the inside workings of the Dover IVO jack. Haha. Any description or manual on the needed repair is much appreciated. Thank you.
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Joined: May 2013
Posts: 239
enthusiast
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enthusiast
Joined: May 2013
Posts: 239 |
The rollers are the same ones used on Dover pickup assemblies. I blow back oil into tank with compressor, use a big chain wrench to remove and tighten back down on top section of jack . Do a good job using expando and let it sit over night to set.
If all else fails, read the instructions
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Joined: Apr 2020
Posts: 520 Likes: 2
addict
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addict
Joined: Apr 2020
Posts: 520 Likes: 2 |
Are the rollers mounted on the top end of the stationary piston?
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Joined: Nov 2009
Posts: 468
Journeyman
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Journeyman
Joined: Nov 2009
Posts: 468 |
Yes in a 120 degree pattern. Hang the car sling approximately where the joint of the jack will be even with the top of the piston. Hang it on a couple of come-alongs so you can move the sling up or down a few innches.
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Joined: Apr 2020
Posts: 520 Likes: 2
addict
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addict
Joined: Apr 2020
Posts: 520 Likes: 2 |
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Joined: Apr 2013
Posts: 17
stranger
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stranger
Joined: Apr 2013
Posts: 17 |
The rollers on the piston are indeed the same size and shape as the door drive and clutch retractor rollers. However, they are made of a different material that is much more oil resilient. They are supposed to be blue in color. The door drive rollers are red and very firm. The clutch retractor roller is black and very soft. The black rollers will quickly disenegrate. The red will last longer, but run rougher. The blue will give optimum life and smoothness in ride.
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Joined: Apr 2020
Posts: 520 Likes: 2
addict
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addict
Joined: Apr 2020
Posts: 520 Likes: 2 |
Ok, thank you slider. I'll get them from Vertical Express.
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Joined: Jun 2015
Posts: 1
stranger
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stranger
Joined: Jun 2015
Posts: 1 |
Looking to get a copy of the Dover IVO installation manual for the holeless hydro. I have not been able to download same from this site. Working with a project that is reported as "jack guide rollers have worn a groove in the jack casing." The noise in the 'up' direction is loud; however, limited noise in the 'down' direction. Thank you
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Joined: Nov 2009
Posts: 468
Journeyman
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Journeyman
Joined: Nov 2009
Posts: 468 |
When you change out the rollers, look and see if the piston is centered in the cylinder. If not, adjust the piston platen on the floor to center the ring up, or you will prematurely wear out the new rollers
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HW PM
by Chris, January 13
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