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Topic: PowerTech 10K Vibrates the Whole Coach (Read 1120 times) previous topic - next topic

PowerTech 10K Vibrates the Whole Coach

I have been very disappointed with the PowerTech generator and Kubota diesel engine on my U300 since I got it last fall due to a lot of interior noise and vibration. I had MOT check over the generator, genie exhaust and radiator to see what was touching the MH chassis. I couldn't find anything and neither could they. The isolaters seem to be perfectly good. They look like they were replaced sometime in the recent past.

Yesterday I was changing the fuel filter and noticed one of the six mounting bolts that hold the slide frame to the chassis brackets were very loose. I was only able to reach two of the six bolts but tightening them down has dramatically reduced the vibration. These bolts are hard to see and hard to reach but I think when I get back to Blanchard I can reach the other four with my long wobble extension and a deep well 9/16 socket.

I'm guessing there may be many other vintage Foretravels with the same situation. It's worth checking. The interior noise reduction with just two bolts tightened is impressive.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: PowerTech 10K Vibrates the Whole Coach

Reply #1 –
Kent,

I am shocked. You don't have two of those tools with you? That has to be a first.
We are only strangers until we meet; however, some of us are stranger than others

Re: PowerTech 10K Vibrates the Whole Coach

Reply #2 –
I'm travelln lite this week. Its too darn hot to carry everything.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: PowerTech 10K Vibrates the Whole Coach

Reply #3 –
Check with Peg before using the "woble Extention" on you mounts
1993 U300, 6v92
build 4366
USAF retired, Flight Engineer, C124, C130
 ATP, A & E.  & ex AI

Re: PowerTech 10K Vibrates the Whole Coach

Reply #4 –
While I can't say the 10KW unit in my 93 was real quiet I was very satisfied with it. The 95 is a shade quieter, I expect mainly due to front end mounting rather than under the J-lounge.
The selected media item is not currently available. Dave Head & Megan Westbrook
Titusville, FL - The Great Outdoors
'98 270 buying this month
Toad is a 2018 F150 XLT

Re: PowerTech 10K Vibrates the Whole Coach

Reply #5 –
Power Tech has Firestone air bags for your genny.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094

Re: PowerTech 10K Vibrates the Whole Coach

Reply #6 –
Quote from: Bill Willett –
Power Tech has Firestone air bags for your genny.

Kent,

Good work on finding the loose bolts! Will look at mine as I also have not been really happy with the noise and vibration. Bill may be on to something in the quoted post. Mounts that look good may not be doing the best job because of design, etc. Isolating noise and vibration is more than throwing some mounts on. My Onan generator in the old, old Southwind still runs great and you can't really tell it is running when inside the old girl. I have a new Onan Emerald sitting on my garage floor gathering dust. Sometimes feel like throwing it in the compartment. I can never feel any vibration of any kind at any RPM from the Detroit, just the great exhaust note with the window open. The PowerTech should be the same.

We take ours a little off road in getting to some campsites and while I have not scraped the bottom, I have hit the 90 where the exhaust comes out underneath. A future project will to investigate sending the exhaust forward and then out without the pipe being exposed. I think I will change muffler design and increase the pipe size as I don't like the hiss that goes with the exhaust note.

Bottom line is the 10Kw genny is meant to be seen, not heard and can be trained to be that way.

Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: PowerTech 10K Vibrates the Whole Coach

Reply #8 –
Firestone Industrial Products W01-358-7001 Air bag, they are not cheap from Power Tech,
 $130.00.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094

Re: PowerTech 10K Vibrates the Whole Coach

Reply #9 –
My PowerTech seems to be very quiet outside the coach. The vibration in the coach is my big gripe. If tightening the additional bolts doesn't do the job, I might try the Firestone isolaters if they will work on my older mounting system.

Pierce, let me know if you figure anything out. I will do the same.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: PowerTech 10K Vibrates the Whole Coach

Reply #10 –
Kent,

Figured that was not too bad to do a generator but looked them up and found that is the price for ONE! Thats almost $600 including shipping for 4. Found a used one on ebay to look at. $89 plus shipping. Here it is: NEW FIRESTONE W01-358-7001 CONVOLUTED BUS AIR SPRING on eBay!

Will give your tightening technique and other options a try first.
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: PowerTech 10K Vibrates the Whole Coach

Reply #11 –
Think the word "Proper" is abused by some when it comes to the rubber mounting cushions on generators. Can assure you I have seen many variations of "simple" mounting, wrong and creative home grown ideas with the overall vibrations were expected.  Along with ducting and exhaust mounting all contribute to how smooth one will run.
Have seen gensets that are a known rough runner (Onan JB Series) installed where they did not vibrate the vehicle.
It should not be a major issue to isolate a 2 cylinder Onan or a 4 cylinder Kubota where you might hear it, but any vibrations would be very minimal at most. 
Do not think Foretravel could sell a coach with a noisy and vibrating generator. ?

Re: PowerTech 10K Vibrates the Whole Coach

Reply #12 –
Goodyear Air-Spring # 1B5-500 is the crossover part number for the
Firestone W01-358-7001 Air-Spring. 

Now for the best part.. if you have an interest in switching over to these,
the Goodyear Air-Spring is $72.00.

I located the Goodyear Air-Spring via Google.

I'd be interested to hear from someone that has made the change and get a report on the upgrade and if it's worth the extra cost of the OEM cushions.







S/W Houston 95" U320C SE/40' 
Build #4778  Cummins M11
Repairs & Covered RV Parking (BAO)
PPL is close..

Re: PowerTech 10K Vibrates the Whole Coach

Reply #13 –
Is that $72.00 for one bag or the kit ?  Is there a kit ?  How many bags are needed ?
I find my 10kw 4 cylinder Kubota very smooth and quiet inside, yes you can hear it IF the TV & a/c is off, other wise it is not there when running. Zero, Nadda, Zip etc ;D
No idea Kent how yours is mounted, Is it on the side under the coach or in front center ?
Clearly under the couch would be more noticeable. ?

I would not be interested in the air bags, even if they were FREE, just more headache, leaks and problems with suspension & rubbing hoses & wire.  My point, why fix what does not need fixed ?  If you have an issue, FIX it with the normal parts as designed.
My Opinion of course
Dave M

Re: PowerTech 10K Vibrates the Whole Coach

Reply #14 –
Dave,

Ours are in the first compartment back on the driver's side and right under the sofa (straight sofa on ours).

Everyone with GV and a 10Kw (or 7.5) should pull the generator tray out and check the flexible exhaust pipe for vibrating against the inside wall. Ours had burned through the insulation and was rubbing against the metal.

Damaged generator mounts can be checked at the same time as you can't see the damage from the top, only by looking up from the bottom. Ours are shot.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)