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Let’s Talk ISRI seat
Hi All,
I just did a long weekend trip (didn’t we all?) and I’ve been wondering how the seat is supposed to work. Basically, I’ve noticed that when I sit in the seat it does “energize” with air… but Basically I’m still sitting at the “Bottom” of it’s range of movement. If I use the seat up and down lever… I can get it to go up about an inch. But – as we drive, I basically move up and then bang down at the bottom. It’s as though it doesn’t get enough air or if there is some system that measures weight that isn’t right.
How is this seat supposed to work? Are you supposed to be sitting on a piston of air the whole time? Or are you supposed to bottom out during dips and such on the road? I haven’t ever had one of these before so I don’t really know if it is or isn’t working correctly.
Thanks!
Walt
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27 Replies
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All the seats in my 3 coaches had an “air ride”. When I sat in it, it would go down, but then air pressure would raise it to the height I set when I first adjusted the seat. From that point on it would respond to the bumps in the road and maybe it has bottomed out on some types of bumps, but for the most part every seat supported me and absorbed the bumps. When I would get out of the seat, it would rise momentarily, and fall back to the height I presume is the set point. That suggests to me the seat has some type of internal controls that adjust air pressure to maintan a set height regardless of the weight on it.
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My seat goes up and down responding to the dips in the road. For a while I thought I would get seasick, but you adjust to it after a while. I haven’t bottomed out the seat yet, perhaps due to me having the seat fairly high for leg room, or perhaps you guys have eaten too much BBQ over the weekend!
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Our seat works as Jon described. The up and down adjustment is very fiddly but once set works great.
Our dog, abby, would agree. Until we were at Jeff’s last week she was not allowed in the driver seat. However, Jeff had her hop up on his lap, front paws on the steering wheel, as he drove the coach into the shop. So, Jeff is in the dog house now but he got a laugh out out the ride. Abby is now taking driving lessons ’cause Jeff said she could. Dang me.
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Walt I think the seat you have has a ride height valve in it so when u are sitting in seat it will air up to the weight when you get out it puts some air in it automatically to make it easy to get out of drivers seat then when u sit back down it airs up, unless you have a valve or button to manually put air in seat , the valve is light brown color under seat when sitting in seat it’s on the right side under the rubber boot that goes around seat there should be a screw so you can adjust it on the brown valve under the seat
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I don’t even use it, the bus rides so well.
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Your ass is bigger than mine lol
And your legs are short
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In Sand point ID going to Canada in morning -
These are the controls our seat has:
The “seat up down” lever when I push it DOWN – the seat goes up a little bit. When I pull it UP, the seat makes a leaking air sound (I just figured this out) and feels like it’s trying to go up but basically doesn’t do much.
The seat does go UP and Down when you sit in it. And when you get out it goes up real high then it sits back down. I’m pretty sure somthing isn’t right. I will look for this valuve on the side tomorrow and report.
Walt
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The seat is going to rise when you get off of it because the air bladder is pressurized to handle the weight of a person. So when you get up from the seat the pressure that held your weight makes the seat rise until some air pressure can be exhausted allowing it to return to the correct height.
When you sit back down that lower air pressure will not support your weight so it will sink, but then it should rise as air enters the bladder to restore the seat position to the correct height.
I do not know when this started, but later model coaches have the seat air supply on a solenoid valve controlled manifold so the seat will not air up without the key being on and chassis aux pressure at normal levels.
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Mine is identical to yours Walt. I started replacing parts so it would hold the various settings and lumbar and finally gave up, the parts are crazy expensive.
Peter – I think you’re confused and been watching the ass of the horse ahead of you too long!:) Get a Marathon H and you won’t need seat air…..
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Just giving you hard time buddy that’s all
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I would be disappointed if you didn’t…
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Walt, I have the same seat. The control closest to the front of the seat is the one that activates the air system. Make sure that switch is pulled up (outward) not pushed in/down. If it is pushed in the seat will not function. I bump that switch with my leg about 50% of the time when I get up from the seat so I frequently have to check it make sure it is pulled out all the way. I had a leaking valve at one of the switches that was fixed by the dealer with a rebuild kit for around $100. Good luck.
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Hi Walt,
Did you get your Isri driver’s seat working? I have been having the same problem with the seat bottoming out. The seat was removed to install new carpet, and when I got the coach back the seat was bottoming out. Also, it seems I am sitting higher than I did before.
I had Prevost in Richmond, BC, check it out and they could not find anything wrong with the seat. I am wondering if it should be mounted over the carpet or not…I understand there is a shock in the seat somewhere that could be the culpert also. Let me know if you figured out what caused your seat to bottom out.
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I don’t know that I really figured it out – but, I did discover one of the levers seemed like a drag control. I started futzing with that and was able to get it to where it didn’t bottom out anymore. It’s the lever that has a shock absorber on it. I pushed it down partially and it “tightened up the system” and added more dampening. Try it out. It’s the 2nd from the front in the photo above.
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