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Old 11-22-2015, 06:54 PM   #1
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Join Date: May 2005
Posts: 54
Roadside Slide Failed

We bought a new 2015 Dynamax Trilogy 38WT in February and love everything about it except the apparent negligence that went into building it. Its almost as if Dynamax told the engineers and craftsmen that after they built my unit they were going to b fired and then Dynamax burnt the build sheets. But I won't bore you with the past.

A week or so ago the long roadside slide, maybe about 20' long, started making lots of noise. I called a local dealer to come out and check it and made an appointment to get the RV in and repaired. Long story short, after about a week of seeing what the next failed part was going to be it turned out that one gear pack was completely stripped with the other two damaged. The weld on the middle rail had broken and one of the three rails had twisted. For those who don't know the way this works is that there are three rails with three gear packs that are tied together so that when one is pushed (or pulled) the other two turn with it. The push (and pull) is performed by a hydraulic cylinder.

For all you engineers out there, where would you put the hydraulic cylinder on a slide that is maybe 20' long with a French Door domestic refrigerator and a floor to ceiling pantry next to it and a TV on the other end? If you said that the hydraulic cylinder would be placed at a point determined to be the center of the weight on the slide you would be wrong. If you said that the hydraulic cylinder would be placed at the center of the slide you would be wrong. The hydraulic cylinder was placed about halfway between the rail at the opposite end of the slide from the refrigerator and pantry and the end of the slide. Its not even between the rails.

Now am I crazy or would just about any reasonable person think that putting the hydraulic cylinder at the opposite end of the weight is a prescription for problems? Has anyone else had problems with a set up like this? Has anyone else have a similar system that works for them?


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Old 11-23-2015, 08:56 AM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
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Sounds like a Lippert slide drive set up. Apply power to one end of the slide and rely on transfer shafts and gears to move the rest of the slide.
Dynamax probably didn't engineer, or build, the slide drive , but did decide where to put the heavy items in the slide, and the location is based on what looks good rather than balance.

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Old 11-23-2015, 12:52 PM   #3
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My OLD Alpenlite has an Acme screw at each end of the slide. A 40 to 1 gear ratio motor turns the acme screws. Way to slow for todays crowd that need all the bells and whistles and they want it NOW. The slides have been in and out at least 1000 times and still rolling along after 21 years.
2001 dodge 2500 auto, with billet Mojave Green torque converter with 2nd gear lockup mod, raptor 100 fuel transfer pump and gauges. RV275 injectors
94 Alpenlite 27sl with many mods. Master mechanic over 55 years
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Old 11-23-2015, 05:59 PM   #4
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It is a Lippert assembly and they're working with us except don't want to re position the cylinder saying the system works in all but our unit. I can't tell you how much that surprised me since I've gotten no replies to the contrary. But I can't help but think that the strain will cause many more failures as time goes on.

A screw drive would be fast enough for us.

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