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Thanks Keith, I agree. I have not found any organization willing to recertify new components within an obsolete chassis, and obviously you can't test the board by itself - it needs all the associated control boards, I/O boards, and cooling systems to do anything at all! It'd be great if there...

Folks, I'm building a power board and a control board for an obsolete inverter. The inverter has an input of 24V and an output of 120VAC. It's a very popular inverter which has a long history of use in the Motorhome industry. It is not grid tie. The oldest of these inverters is exceeding 25...

Thanks everyone!

No idea what aluminum is used; if it helps I believe it's cast and advertised as aircraft grade. The bar is of this design: Link. The first joint pivots about the x-axis, the second about the z, and the third about the y.

Thanks everyone. Sorry I don't have any more info or pics to share. I use the same bar and was hoping to learn how to avoid whatever caused this failure. My friend has a different style bar and he recently had a failure. This failure I know was caused by a high vertical load because the receiver...

This is a connection to a tow bar for towing a car behind a motorhome. I don't have any additional pics. Here's the bar: Link. This is all the information I have. How would you say the forces contributing to this failure occurred: Axially, vertically, or laterally (hard turn left or right), etc...

Thanks romke, Page 18 of this link talks about the retarder integration with service brake application: Link. In short there are a series of air pressure switches that send voltages to the TCM for retarder activation. It's interesting they also mention the use of vehicle air pressure used to...

I have a bus with an Allison 4060HD transmission equipped with an integral hydraulic retarder. I have a switch on the dash to enable the retarder. I also have a six position modulation control stalk to select the amount of deceleration. If the modulation lever is set to off but the dash switch...

Thanks Mike and PJGD. What you wrote gave me a lot to go on. Now that I know it's a tunnel crankcase design there's a ton on the web describing them. Best, David

Folks, I've never seen the style of main bearing cap assemblies that Kubota uses. It's clear that they end up with a very stiff block. Below is a photo album of the bottom end plus some snippets from the engine service manual showing the assemblies. I'm interested in the tolerance of the...

Thanks cibachrome. There is a company that makes something like you describe. They're called motion control units (MCU). The steer suspension on my bus definitely has the left and right air springs plumbed together using a T - this is pretty standard on buses.

It rides good, goes straight, and negotiates a turn, but you're absolutely right about driving conservatively. The weight distribution is 30% steer and 70% drive/tag. It weighs 47500 lbs. I probably have 4300 lbs of unsprung weight: (1100#, 2000#, 1200#: steer, drive, tag). No anti-sway bars...

Thanks everyone, and thanks dynatune for anticipating my next question, which would have been "where's the roll center on the tag axle"? I now know it to be at the wheel center height. The steer axle suspension is a beam axle and looks like the drive axle but rotated 180 deg; that is, 4 trailing...

Thanks Greg, The manufacturer says this: "Single central hanger unitizes drive and tag suspensions allowing suspensions to operate in correct phase with drive line angles for maximum life of components". The part about "correct phase" prompted me to dig a little deeper. This is a diesel pusher...

Here's a link to the drawing.

I wonder if someone can explain the attached suspension geometry to me. It's on my motorhome which is essentially a 3 axle bus. The attached drawings show the rear suspension which has a single hanger that supports both the drive and tag axles. The drive axle has 4 air springs, the tag axle 2...

Thanks guys, The ball joints exhibit rapid wear due to prematurely cracked and deteriorated boots. We're addressing that problem too. I got a bit of good news from the manufacturer today - looks like they will make a run of parts for us. You can be sure I'll be pestering them for drawings...

Folks, I have a bus that uses an IFS steer axle provided by one of the major drivetrain tier suppliers. I'd rather not name the company since I am trying to convince them to support the product. I thought I'd solicit the opinion of this board. The axle is 16000 lb GAWR, it uses unequal length...

Thanks guys, given the seriousness of this issue I now realize that I need to spend the bucks for a profession consultant. Thanks again, David

It appears there's trouble with the link to the image. Here's a photo album of the image: https://picasaweb.google.com/dmb2000/RolokBolt?authkey=Gv1sRgCKWqnciwi_P41gE#5762614072538663506